> a=v2 /r
That seems like a lot of work.
OP - Just throw an accelerometer in there and call it a day. Your phone should do nicely ^^(/s)
This is easily debunked.
He claims to measure a current of 15A coming out of his device in his demonstration.
The video is a bit out of focus, but I managed to find a frame at around the 6:04 mark, that allows me to identify that he is using the Innova 3306 multimeter to measure this.
Here is a link to the (pretty shitty) manual for that device that states it only goes to 10A and can even be damaged if used at higher currents.
If you look at the video and compare it to the much clearer image on the Amazon page I linked above you will see that he has actually set it to measure voltage in the range up to 20V.
He has also connected the leads wrong. No matter what he is measuring, the black lead should be connected to the center "COM" jack.
So he is not measuring current, which makes sense, because he also doesn't have any load connected to his device for that current to go through.
In other words. He is using a 12V, 1.4A battery to power something (DC-motor driving a generator most likely) that is capable of generating about 19V unloaded.
His claims are ridiculous and his presentation shows him confusing voltage with current
> What about the thousands and thousands of T1 and T2 suppliers? What about the other related industries, RV's? Delivery trucks? Upfitters?
So much this.
I cringe when I see /r/EngineeringStudents limiting themselves to Boeing, Lockheed, Ford, GM, et al.
Eaton? Honeywell? Rockwell Collins? There is just as much, if not more, R&D and engineering going on at these non 'big-3' suppliers that some students don't even know about.
Edit: Here are a listings of entry level full time jobs within 150 miles of Detroit that you should qualify for.
Basics of Mechanical Engineering https://www.amazon.com/dp/8189866206/ref=cm_sw_r_cp_apa_i_dvG8DbE4QNDJ0
First, maybe that's what you're looking for? I'm gonna get off track here:
Maybe it would be interesting to get her introduced to calculus. That's where my interest in math started to take off. Little ideas such as learning the logic and definition of the derivative and such. I'm not sure where she's at, but a standard calc 1 book would probably work if she thinks hard enough!
Also, maybe introduce her to programming In python; "Automate the boring stuff with python" is a super digestible beginner programming book.
For mechanics, there are two things to think about here for now; Maybe you could try to introduce her to the mathematical side of analyzing forces and torques, or maybe you could introduce her to manufacturing processes/CAD etc..
Side note: if this is a Christmas present kind of thing, a 3D printer would be the Pinnacle here. She can learn an insane amount by 3D printing things for fun. They're getting quite cheap now, as you could see from a simple Amazon search!
Edit: I want to specify that the book I linked does require some skills beyond her scope to totally grasp, but it introduces plenty of topics that she could understand.
I don't. "Never memorize something you can lookup" - Einstein.
You remember what you use often, everything past that you just need to be familiar enough to know what direction to head in. My phone is pretty much all I need, the key is knowing what to look up, where to find it, and how to filter out bullshit.
A good calculator on your phone (https://play.google.com/store/apps/details?id=com.duy.calculator.free) and some good reference apps (https://play.google.com/store/apps/details?id=it.android.demi.elettronica.pro) are really handy too.
https://www.amazon.com/Nyrius-Transmitter-Streaming-Projector-NPCS549/dp/B009E6R89C there's numerous wireless HDMI transmitters, and the drone community is working on a 1080 low latency wireless standard.
Determine weight of hot tub + water + occupants + bystanders (there will be bystanders)
Determine square footage of the area over which the weight will be distributed
Look up your county/city codes for ~~"dead load" (i.e. amount of static weight a building's floor is rated for)~~ sorry, furnishings fall under live loading
If the weight/area of the hot tub is greater than the ~~dead~~ load rating, then no, it will not work.
Ok, assuming this hot tub with dimensions 70"x61" and using the typical values found on page 7 of this document (40psf/300 lb), you'd already fail because the concentrated load is far too high. But disregarding that:
Hot tub above, filled (says 1830 lbs in specs) + ~6 people @ 200lbs each = 3030 pounds
70"x61" = 4270 in^2 = 29.65 ft^2
Loading = 3030 lbs/29.65 ft^2 = 102 psf
No, this won't work.
EDIT: forgot that I specified the hot tub; revised calculations
I love Subnautica! I was just playing earlier today!
This is a pretty big project for someone just beginning. Have you considered just buying one off the shelf? Take a look at the Cayago SeaBob or Yamaha Seascooter for example.
For underwater electronics, you'll need to make a waterproof compartment that can be opened to charge the battery. There's off the shelf shaft seals available, but I'm not sure what depth they're rated for.
You'll also have condensation to worry about; if you have hot, humid summer air inside and you take it underwater, it will cool down and you can get condensation on the walls or electronics, which could fry your electronics.
You'll also need to make it light enough to be approximately neutrally buoyant, so it'll have to be strong enough and big enough to contain enough air.
I'd recommend making an electric scooter for the ground first to get used to working with these sort of electronics and mechanical frames, then consider if you're up for building an underwater version.
Possibly. Personally, I would use something like "VHB" tape on the end of a stick. Not only do you avoid excess adhesive and cure times, but even a small piece can be pretty darn strong.
Excel 2003 Power Programming with VBA. Currently $4.94 on Amazon, though you might consider the latest edition. Got this when I was an undergrad, taught myself VBA and became an Excel "power user". Knowing VBA has been infinitely useful in my career and having it on my resume (along with projects and tools I've created with it) landed me my current job even though I wasn't even in the market at the time!
I have Genius SP-HF2020 speakers. They're a decent desktop set, good sound, good build, with an infrared remote, and almost all the remote's functions are available on the speakers themselves.
Except one.
The motherloving ON-OFF button. If you lose the remote, you can still use the speakers, except you can't turn them on. Which, you know, isn't very good.
If you unplug them and plug them back on, they are in standby and require the remote to work.
Yeah! How dare he play around with open source CFD solvers!
Seriously though. Open source numerical solvers for engineering computations have been a thing since at least 2009 (probably as early as 2002). Most engineers have taken one or two fluid dynamics courses and that's enough to start fiddling around with CFD.
The Knowledge, by Lewis Dartnell is actually (almost) aimed at this scenario (post apocalyptic, but still). It's actually a pretty decent read.
I strongly recommend "How To Win Friends And Influence People" by Dale Carnegie (ISBN: 9780091947460). This book is a must-read for any person who intends to socially interact with other people. It has some fundamentals in there that you already know about and it has some really good exercises and useful phrases that will most certainly help you with exactly what you are describing. I can't recommend this book enough. The fact that you recognize that you want to improve your social skills is a huge step in the right direction. Good on you for trying to improve. Everyone, at every level of social confidence, should try to improve. Best of luck to you!
CRC Press link and Amazon.
Huh, still working on this, my inputs with the effort you've gone through.
What are the walls made of, is destroying a wall and repairing it an option? If this is a sheetrock wall, at this point I'd just go to the other side, cut through it, grab the phone and repair the wall.
Do you have something that can be stuffed between the wall to pull it up, I'm thinking something like a rubber ball on a coat hanger, force it between the phone and wall and then pull it up. An inflatable ball would be ideal
Don't use a coat hanger, use a fish tape, do you have one? can you get one? You would need to make it so it has a right angled bend on it so it can go under the phone and then pulled up. Maybe a U shape.
I would see if you can use a vacuum cleaner and get enough suction on it.
And the easiest thing (but last I thought of), buy this, now you're done.
I considered the trigger style of handle, but for this purpose this design of handle is more ideal. Sorry, I should've made that clear I am new lol.
https://www.amazon.com/Grabber-Reacher-Rubber-Ergonomic-Handle/dp/B00K2Z89ME
It didn't inspire me to be an engineer, but a good book to read is "into the Black" by Rowland White, about the creation of the Space Shuttle from it's inital idea to the end of the programme. It also covers both disasters, and is full of information and anecdotes from engineers who worked on the programme.
I purchased it at the airport when we were going on Holiday one year. I don't recall the holiday much, but I remember the book well!
It definitely triggered (or maybe re-ignited to keep it rocket themed) my love for Space when I read it a couple of years back.
Heres the link - And I'm shocked to see how cheap it's going for now!!
Not sure about events in your area or if you have a budget for gifts, but you can never go wrong with LEGO: https://www.amazon.com/LEGO-Ideas-Apollo-Saturn-Building/dp/B071G3QMS2
I'm turning 21 soon and i'd be stoked if i got it as a gift (since i build plastic model kits as a hobby.. not sure about him).. a surprise private flight lesson would be great for you two together too like the others suggested
I don't think I've ever used a fractional inch in engineering. Always decimal. I even have a decimal tape measure.
As for Imperial Vs. SI, I honestly don't have a preference. I use whatever makes sense for the project at hand.
If you had a space station, and drive a car off the edge of it, you'd have used a couple ounces of fuel, but you'd be traveling forever. So infinite miles for far less than one mile.
Some of the hyperloop ideas focus on the tube being in a vacuum or filled with helium, therefore reducing the air resistance to improve speed and efficiency
Also thought I'd link to the limits of heat engines, just in case anyone coming upon this thread is less familiar with it: https://www.wikipedia.org/wiki/Carnot_heat_engine
underrated comment...
​
And, if the blanket is too inconvenient, there's always https://www.amazon.com/ATATAKAI-Charging-Electric-Washable-Adjustable/dp/B07HHM35XK
There's a book called Shop Class as Soulcraft that talks a lot about the difference in culture between professionals/office workers and tradesmen.
In the office world, it's unusual for anybody else to understand your job, so people can't really tell if you're doing a good job. Success and advancement often appear to be the result of politics, affiliation, appearance. Politeness and clean appearance are prized, and considered the bare minimum for success.
In the trades, your work is on display for all to see. Respect comes from supporting the team and getting results. Even the ugliest, rudest, most unpleasant people will get respect if they put in an honest day's work and do a good job. Cussing, insults, etc. are some of the ways that hard working people blow off steam.
And you start from a social disadvantage: you're a kid, you're new, you've got a degree and you're a "social better". Stepping in a hole on day one was like a golden ticket for them to make fun of you. Let them have their fun, take it in good humor, etc.
I don't think an apology letter would make much difference, but maybe a thank-you gift for their patience, such as donuts. And the promise of more donuts to come.
A similar book but a little more directly matching OP's scenario is How to Invent Everything: A Survival Guide for the Stranded Time Traveler. It's kind of a fluffy book that doesn't take itself seriously, but does attempt an outline of key inventions that allow advancing civilization more rapidly at each point in time.
But the information in that book is easy to absorb and more or less memorize. I'd want to condense it down to key facts, like recipes for simple chemical processes, etc., and then I'd be tempted to say I'd want some math tables, if I don't have a calculator, but I'm not quite sure how soon I'd need that.
A map of mineral deposits would be pretty useful.
> If they end up using it, I'm sure it's for a good reason
I would recommend you read Doomsday Machine by Daniel Ellsberg (yeah, that Daniel Ellsberg). It may change your notions on that.
> Also pretty sure they aren't allowed to ask you about some aspects of your personal life in an interview
Yup
https://www.betterteam.com/illegal-interview-questions
https://zety.com/blog/illegal-interview-questions
When I was an undergrad we got to hold interviews for our next RA and even we had to go through a bunch of training on what we were and were not allowed to ask. They heavily emphasized that we could not ask about whether the person/couple had kids or were planning on having kids. Interviewees are free to volunteer that information, but they cannot be asked that question as part of a job interview. If we, as undergrads, can be held to that standard and interview candidates knowing what cannot be asked, a freaking hiring manager damn well should too.
That's a good idea, but I'd go more for the insulated mug with a drip-proof lid, like this
That'd be far more handy for the bus-ride to campus, drinking in class, drinking in the computer lab, etc.
You should read The Perfectionists it's all about the history of precision measurement, telling stories centered around the 'leaps' (now able to measure to .1", now able to... etc.) and how it impacted the world.
I have 15 years experience and work at a company your grandma has heard of as a design engineer making >$300k.
I read this book years ago and it helped a lot:
Definitely +1 from me. A good book on design will improve software skills a thousandfold. Books like Code Complete 2, The Pragmatic Programmer, Head-first Design Patterns, Coders at Work... those are what shape software engineers, not figuring out some ultimately-trivial language nooks and crannies.
While I can't help much on the engineering side, I would seriously suggest an emergency stop button within easy reach.
As for parts procuring (since it seems the community is suggesting some more tricky/expensive parts) you might want to check Alibaba. Good, cheap parts from solid manufacturers (Just make sure to check out the vendors).
Also: I think this song is Relevant.
Octave is a pretty good replacement for the majority of MATLAB commands. It is nice because it is quite close to a clone in that most of the code written for MATLAB will work with Octave (plus it's free!). That being said I've heard many good things about Python (with appropriate packages) from co-workers.
The Way Things Work was one of my favorite books as a kid. It explains the mechanics of every day objects. There is also a newer version called The New Way Things Work but I think that one is more electronic in nature.
Yes, absolutely you can put solar panels on a car. No, it won't provide a worthwhile amount of energy. This quora post goes through some of the math so I won't repeat it.
You can buy a Toyota Prius with solar panels on the roof today. They only provide enough power to run a small ventilation fan when parked though.
Practically speaking there are two options at your disposal for making a dynamic rerouting decision like this: DNS or a floating IP.
DNS is nice because because it's out of band and you can request the same resource but get a different answer or IP depending on the state of your servers (e.g. always return the IP address of the primary unless it's down, in which case start returning secondary). For this to work you'd need to hardcode a URI into the app rather than the IP of the primary or secondary servers. You'd also need to write some code to dynamically update the DNS record when the primary server goes down or fails a healthcheck, or use a managed DNS provider that has these capabilities built in. If you control all of the systems and resolvers, you can use a 0 second TTL and disable or configure the relevant services (nscd/dnsmasq) in order to prevent the IP from being cached.
If your tolerance for failovers is milliseconds or your IP address is hardcoded into the application and can't change then you'll have to use a floating VIP - an IP address that both the primary and secondary servers have the ability to bind to an interface. This comes with its own set of complications but Digital Ocean has a nice overview here of one of the many ways you can implement this.
Another alternative which it sounds like you've hit on would be to build the healthchecking into the application itself and hardcode both a primary and secondary IP, then change the behavior of the app such that if it's unable to connect to the primary after x number of seconds it tries the secondary IP.
Those just look like TV antennas.
I think you can buy those at best buy.
If you have a specific impulse you can give to the plane, wouldn't you want it to be horizontal? It seems like the most important thing is exceeding the stall speed of the plane, at which point it can generate it's own lift. Angling it up would reduce the speed of the plane (kinetic energy) in exchange for a small increase in elevation (potential energy).
Edit: Just read the wiki for the ski jump design, and it mentions that the additional elevation and angling of the plane helps keep the plane high enough off the water while the engines are still accelerating the plane (and reaching stall speed). That produces the ability to carry heavier payloads as you mentioned. I think the trade off is that you have to use afterburners on launch (extra fuel) or use the entire flight deck for each launch (space requirement) which slows down the next plane launch. Note: this is a quora link quoted from yahoo answers, so I wouldn't claim it as an authoritative source. It's a reasonable assertion though. You have to scroll down a little to get to this quote:
https://www.quora.com/Military/Why-dont-US-Aircraft-Carriers-have-ski-jumps
> The drawback is that to launch aircraft the entire length of the deck has to be clear, which slows down the pace of lunching aircraft, prevents simultaneous launch and recovery of aircraft, limits the size of an air wing the aircraft carrier can embark, and limits the weight of the aircraft that can launch off the carrier. By contrast, a US Navy carrier with four catapults can launch an aircraft about every 30 seconds or launch and recover aircraft at the same time.
Hello! For my non-profit I do version control of EVERYTHING, but at my day job I do version control for documents and software, but it would work with CAD as well.
In the past I used Subversion, but now I use Mercurial: both of which have a GUI interface which is pretty easy to navigate once you get used to it. There is one main difference between the two:
Subversion is more serve based - lots of people working on the same project will check their changes into subversion to keep the central server up-to-date, and everyone pulls changes from the server to get what everyone else has been doing. This takes good discipline, and an excellent working knowledge of the server and how to troubleshoot subversion.
Mercurial is more peer-to-peer. Everyone has the 'server' one their own computer, and they can pull or push from eachother as peers. Of course, for simplicity sake, we actually stick a repo on a server to keep everyone synced up, but mercurial is nice since you don't actually need the server to do your day-to-day updates, you only need the server when you want to share it with everyone else.
I recommend TortoiseHg for mercurial. No need for server experience, httpd troubleshooting, or any of that. http://tortoisehg.bitbucket.org/download/ << download and give it a try there. There are some good video tutorial on mercurial, such as this one: https://www.youtube.com/watch?v=wqU9MFplgrQ. WARNING: TortoiseHG does take some getting used to, and there are ways to hose up your work. Make sure you branch whenever you are doing work on your own, and then merge those changes back into the main branch (or Trunk). It does take some team discipline, but do sit down with your team for a day and figure it out. You won't regret using this simple, but versatile tool.
For around $10 you can sorta analyze up to around 1750MHz:
http://hackaday.com/2014/11/19/rtl-sdr-as-a-spectrum-analyzer/
pumped hydro is way more efficient. compressed air round trip is about 70%
http://www.wikiwand.com/en/Compressed_air_energy_storage
I think compressed air gets interest as it uses existing structures like caves, mines or the sea bed. where as there's very few natural sites where pumped hydro can work well.
I've been learning German via an outside website (Duolingo, it's friggin' AWESOME). If you really want to learn it, I'd do it on your own, not as part of a structured class.
The Design of Everyday Things by Donald Norman
It doesn't matter what field you work in, this book will really change the way you look at how you interact with the world.
Here's the app I use to send the WOL Signal, https://play.google.com/store/apps/details?id=com.benfinnigan.wol
The only issue I ran into was when I was leaving, if it disconnected and reconnected it'd send the WOL signal and my PC would be on all night. I set it up to only send the signal when it connects to wifi before lunch, and then I don't have the issue anymore :).
The tasker bit was really simple, Day = Weekday, Time = 7:00-9:00, Wifi Connected; work WiFi, begin task Wake on LAN. I set up the WOL by PC name so I didn't have to deal with having a static IP on my workstation.
I did have to mess with the bios a bit otherwise WOL wasn't working right. The easiest way to determine if WOL is probably enabled is if there's a light on your ethernet port when the PC is powered off. If it's not, there's bios settings you have to change (more than likely).
> Hey man
Hi!
> I made a response in here to OP's questions regarding whether "Sales Engineering" was a real thing.
I mean, there is about 7000 jobs with the title sales engineer on LinkedIn. Google has them, PayPal has them, LinkedIn has them and so on. The title absolutely exists and to even discuss that question is a bit strange.
> Is my response, linked here or above similar to what you do day-to-day?
I worked for PayPal during this time, covering Scandinavia, so my job was to be the technical resource during the pre-, integration- and post-sales process. That included everything from presenting PayPals payment products in meet-and-greet meetings to understanding the merchants current setup regarding PSP/ERP/ecommerce systems in order to understand how to suggest how the merchant should integrate the PayPal product to also helping them with the API documentation, help their developers understand the PayPal API and API calls, resolve any problems they run in to, testing of the API calls and everything else that is included in that process.
> Out of pure curiosity- its okay if you don't wish to share.
I dont know if the above answers your question or not, but please feel free to ask any questions you have :)
Could it be Alucobond?
Another link with more pictures matching yours
Edit:Looking at the specs of alucobond, I think it is a close match based on the thickness of the aluminum in your photos
So, I'm not an engineer- but I did do sonar for 6 years and understand gear mesh noise very well.
The best way I think I can help is if you give me a lofar readout using software like this
http://www.sonicvisualiser.org
It's free- I have more expensive software on my computer. Most of your gear noise is due to imperfections and reducing it will mean tighter tolerances in manufacturing which does not sound feasible given your situation.
I think your solution will likely be to encase the gears, find out if your case is resonating from the internal noise, and then soundproof/ or cut out the resonance.
If you pm me, I'd love to see if I can help out- I've been itching to do some acoustics work.
Python. If you start programming with Python and use Python x,y it'll compliment MATLAB really well because Python x,y GUI was designed specifically to look like the MATLAB GUI to allow for easy transition from MATLAB to Python. With Scipy, Numpy, and Matplotlib libraries, you'll be able to program just as powerfully if you were using MATLAB alone AND all of it is free. Highly recommend Python.
Simulate it with something like this: http://www.falstad.com/circuit/
It's a great way to see the flow of current.
For the microphone try this model: https://www.circuitlab.com/circuit/w88e3e/jfet-based-electret-microphone-amplifier/
Or simply see what happens when you inject a voltage change where the microphone meets C1.
Build an adder out of logic chips. Build an adder using C compiled to an ARM.
Just because you don't notice a revolutionary new product over night doesn't mean stuff hasn't been changing the last 50 years. Go compare a dryer or washer from even 10 years ago when front loaders were almost unheard of. Now LG has some nice ones that use much less resources than in previous years.
The only reason you notice it in the computer industry is because the product life cycle is much shorter. You have Moore's law driving stuff. People build or get new computers every 2-5 years. Every other appliance they keep for much longer. Compare research done in genetics for flys vs plants vs humans. You have 30 days. 1 year. and 30 years. (Plus the ethics of breeding humans).
And with AC and Refrigerators you usually are running up against the laws of thermodynamics. Still compare the SEER rating of an AC unit from 30 years ago to one today.
I don't know where you're getting your compressor relays from but I'm finding a ton for under $50
The starting order of our items will be randomized based on the roll of a dice. Here are the potential starting orders.
Like most polymers, cyanoacrylate (superglue) is a thermal and electrical insulator. If you use this to connect the wire, you would be all but guaranteed to have some of the cyanoacrylate between the wire and the solder on the board, which would not give you the electrical connection you need. If you want to repair it, you're going to have to buy or borrow a soldering iron. Simple ones are pretty inexpensive though, and a soldering iron is a basic tool that anyone should have around the house.
However if you've never done any soldering before, I suggest you practice on something non-critical so you know what you're doing before you try to re-solder the wire back on. If you have a broken electronic you can take apart that can be good to practice on, or you could gut a little project kit to make a simple electronic toy. Here is a site that teaches the basic soldering method, and some simple projects you can do to learn as well.
First of all I'm going to recommend the Khan Academy, they really are great.
Now, about your question, I'm not familiar with any book like that in particular but I think you're looking for a math history book (or maybe even proofs).
> but I'm not sure if I should just fork over the 20-30 bucks each
Maybe try reading a bit of it there, in the store. Try reading a few to see what you like the most then go search online later to see if there's a pdf version of it floating around.
> I was wondering if you guys happen to take notes digitally
Myself and many of my friends use this method. It's much more efficient than traditional paper notes for the reasons you list but only if you actually use it. Keep that in mind, and good luck!
First answer: No.
Second answer: This is a BOTE or Back Of The Envelope calculation.
How big is the drag moving a 1 km cube?
This calculator: https://www.omnicalculator.com/physics/drag-equation
says moving it at 3m/s = a force of 5.4 million joules. So it takes 1.5 kWh per *second* to keep it moving, or 5400 kWh per hour. From this you can see that the drag forces are big.
​
This is a very small cloud -- not even one of those cute little cotton ball. A thunderstorm has hydrogen bomb levels of internal energy.
​
To move cubic km sized chunks of air, you need *really* big equipment. Not very portable. Consider that the largest wind turbines in use now are about 5 MW. And they don't slow the wind much. So whole wind farms are small potatoes to wind forces.
Here is a great tutorial for modeling gears in Solidworks: http://grabcad.com/questions/tutorial-how-to-model-involute-gears-in-solidworks-and-show-design-intent
I will make one note: this tutorial produces gears that are exactly at their nominal dimensions. Real gears are always slightly undersized to allow the gears to move freely. This tutorial recommends adjusting the center distance to accommodate that, I would recommend adjusting the size of the tooth and keeping the center distance at the nominal center distance to avoid issues when you are modeling all the gears of the transmission. To do that, in step 22 - instead of putting your gear tooth centerline exactly in the nominal center of the tooth, reduce the angle so the tooth is ~0.1mm narrower on the pitch line than it would be if you modeled it nominally. This is roughly the clearance that a real gear would use.
Yes, pitch and pressure angle need to be the same for gears to mesh properly. That should be all you need.
This site has all of the calculations you should need to make the calculations for your gears: http://www.cage-gear.com/spur_gear_calculations.htm The formula for center distance is: C = ((n1 + n2)/2) / Pnd
Not sure. It may have something to do with which gears are used for each speed of the transmission? Are the M gears and the C gears on different planetaries?
EDIT: Forgot a word.
I'd say it's better to start off with some other programming language to understand the basics. Matlab works, but the syntax is horrible and might scare you away from the wonders of programming. If you know the basics of programming already, learning matlab once you need it becomes a bit easier.
Consider learning something like Python. Due to the clunkiness of Matlab there's a growing number of scientists and engineers using python with various extra modules to visualize data, often with the matplotlib module which mimic the matlab plot commands, so it's easy to learn to use both.
Try onshape, they are a cloud-based, browser CAD system, so you can use it on any device (win, mac, tablet, whatever). There is a free plan that has no limits on functionality. Developed by former SolidWorks employees and very similar user experience.
What's the delta T or power input and flow rate?
There are off the shelf solutions starting from pretty cheap. 'Tankless electric water heater' will find other similar products.
>Is it safe? Is the Ni-Chrome wire actually being in contact with he copper pipe make the electricity run through the "path of least resistance" which might be the pipe since its copper? or maybe the water?
Yeah, that'll short thru the copper and the wrapped nichrome will do nothing. You'll probably burn out some wires or bow a fuse or your PSU. Even if it doesn't you're not going to get much water heating done.
You can buy band heaters that are designed to heat pipes etc.
If you're determined to wind your own nichrome element there are tons of build guides online that'll show you how to do it without shorting out the element. Kapton tape is the most popular solution.
I finally found a hobby that works well for me which is writing. I’ve been lucky enough to finish my first sci-fi book and have it published. Here is the Amazon link if you’re interested. Having a hobby has helped a lot to combat the stress of an engineering job.
RC Hibbeler Fluid Mechanics. you can get a paperback SI edition for around $25 on amazon. We use cengel and cimbala at school but i don't particularly like their fluids book.
hibbeler is pretty straight forward. check out his other books on statics, dynamics and mechanics as well. he also has a series on youtube for each of those that he uses for his classes... just search "the hib hub" on youtube.
You can buy them on Amazon, although I'm not sure how well standardized wine bottle screw caps are.
Making them yourself is probably going to require some specialized machinery.
The majority of life is made up of the minutiae in between everything you prepared for. As David Foster Wallace puts it, this is water.
Get experience, and make priorities.
You are not wrong. Working 40 hours a week sucks. I feel like the 40 hour work week has endured this long because it is just comfortable enough. Most people are not motivated enough to make a career change that would get them out of it. If you stick with it, you will get used to it. But, you might not want to, and you do not have to.
The practical advice: Use the job to get experience then figure out what you really want to do. Even a job you hate can give you experience; technical, navigating an organization, intricacies to your industry, business experience, and other things which I do not know your job entails.
Set priorities. You do not have time to do everything, but you have time to do everything that actually matters.
All career advice is tinged with people's values. Some people believe you should find a job that does not feel like work. Others think that is a childish fantasy and you need to make as much money as possible as quickly as possible. The real answer is somewhere on some spectrum. To figure out the answer you need to figure out your own values.
If you really hate your job or working 40 hours a week you have options. You could change schedule, job, boss, company, or industry. You could do consulting, or start your own business. You could work at home or travel for work. You could do something more technical, move towards management, sales, service, or even teaching. Maybe you have to try 10 different things. Maybe you should stick with one thing and mull it over until your prefrontal cortex finishes developing.
I recommend reading The 7 Habits of Highly Effective People.
4th year electrical engineering student here. How are you with calculus? Trigonometry? Vectors? For your first year, you are expected to be extremely comfortable with trigonometry, mastered algebra, able to use degrees and radians with relative ease, and you will then dive quickly into calculus.
In a structural engineering program, you will learn differential and integral calculus, as well as linear algebra (harder than it sounds) and working with vectors in 3 dimensions. On the physics side of things, you will apply these mathematical methods to static free-body problems, as well as dynamic systems.
If you can see yourself being interested in that area math and physics, this is the right career for you. I'd recommend checking out The Khan Academy and researching those topics. Also, MIT has all of their lectures recorded on their website! So if you're interested on sitting in some first-year lectures from your home, feel free to here
*Edit: you will also be learning some more chemistry, specifically relevant to some specific materials and compounds, and their chemical structures, properties and dynamics during chemical reactions. I hate that kind of stuff, so I can't answer any questions for you there haha
Ah ok. So the other calc you should do is measure the water depth of where you are taking the water dam power. This will get you head pressure in ft or m of water. Convert that to kPa. Then figure out the maximum water flow rate your water dam can supply as a power source. Pressure differential * flow = power (make sure to use compatible units). This will help you determine if your water supply is able to provide the power the device needs. Since it doesn't sound like some super efficient water dam turbine, plan on the water supply power being 1.5x more than the required power. If the supply power is less than this 1.5x factor, you might have trouble running this pump at spec flow and pressure.
Were you inspired by the PiPad? Because a well-known one of those uses a wood case.
I think the manufacturing of the thing would be pretty simple. Outside of the bulk and weight (which are probably acceptable trade offs for you) the one remaining issue is heat dissipation. Luckily the Pi puts off little to no heat. You may consider doing something like that PiPad (though that used carbon fiber) and having a metallic bottom, maybe something like brass that will still look good, to aid in heat dissipation.
What are you sourcing for hardware? You might consider ripping apart a Motorola Lapdock for the screen, keyboard, and accompanying gizmos.
if you have an Android phone you can download u-Blox GPS evlauation app which shows detailed GPS info. i've used it to verify GPS lock on an airplane.
https://play.google.com/store/apps/details?id=com.ublox.ucenter&hl=en
One non-engineering solution is to include a clause in the contract that specifies that there shall a bowl of M&Ms provided, but there must be no brown M&Ms anywhere in the backstage area, upon pain of forfeiture of the show, with full compensation.
This was the now-legendary clause in Van Halen's contract that was added as a simple way of determining if the technical specifications of the contract had been read and fully complied with. If they found brown M&Ms backstage then there was a good chance that the venue hadn't bothered to comply with all the other technical details... like checking that their stage could support the weight of their production.
http://www.snopes.com/music/artists/vanhalen.asp
EDIT: clarified the fact that they required M&Ms, but no brown ones.
You are describing a underwater habitat http://www.wikiwand.com/en/Underwater_habitat
You can make them as big as your budget is. The pressure on the skin is minimal unless the bubble is really tall, so even some plastic sheeting or a tarp would work just fine.
The dangers are probably the same as anything else scuba and as you see most of the guys doing it are just free diving and not going all that deep, my biggest fear would be getting stuck in the plastic and unable to ascend back up to the surface.
Linear algebra as a concept and as an abstract field shows up everywhere. You may not use specific techniques you learned in your class (like Cramer's Rule or LU decomposition or whatever) but the idea behind matrices and vector spaces and mappings show up all over the place - both in discrete math and in continuous math.
You had mentioned AI. Support vector machines, clustering techniques etc. all end up using vector spaces to represent and reason through the problem they are attacking/solving. Try this https://www.coursera.org/course/ml
Want to apply linear algebra to gaming? Pick up any beginners game design book (assuming you have some programming experience) and start learning about how view/camera/object transforms work. Apply cross products to acquire normals and calculate collisions and bounding boxes using pythagorean distance relationships and dot products.
Even within your own field, if you pick up some protein folding or genetic analysis software, you'll find a healthy dose of linear algebra in there. The trick is to not go looking specifically for matrix problems but to let it come to you. Go looking to learn something new and just attempt to solve problems and you'll quickly begin to realize that a lot of different looking concrete problems can be abstracted into some very well understood linear algebra problems and you can start applying your knowledge there. If you do anything at all related to spectral analysis, control system, signal theory, information theory (including bioinformatics), graphics, analytics, networks, visualization, statistics... you're bound to end up with software and matrices all in one place.
Without specs of how powerful of a suction you need, flow rate, power source, or other specs, here is a generic response based on devices I have used before.
Here is a DC vacuum pump commonly used in small toys or devices. This is basically a small compressor but the hose is connected to the input. There are certain types of fish tank air pumps that can be modded to do this.
Now, "suction" can be created using many other methods such as venturi effect, mechanical movement, electric fields, pressure zones, ect... Please give us more information as to what exactly you want help with.
Related question: has anyone checked out Julia?
It's an open-source language that's aiming to have the same functionality as Matlab (among other things).
I was wondering if anyone could see it replacing Matlab in the future (maybe within a decade)?
I highly recommend learning the Python language. Start by downloading the <strong>Anaconda distribution</strong> of Python 3 and installing it on your system. Once it's finished installing, run the Anaconda launcher and wait for it to load (it will take a minute), then start up qtPython or JupyterLab to get a Python interpreter.
Finally go to <strong>Automate the Boring Stuff With Python</strong> by Al Sweigart, and work your way through each chapter. In total it should take roughly 40 hours, maybe longer if this is your first programming language.
I also suggest cross-posting to /r/cscareerquestions
Python is one of the more popular current programming languages.
VBA and SQL would be very useful as well, working with large amounts of data. Excel Macros could be helpful as well - looking online will honestly teach you a TON.
I used to do CSS / HTML as a hobby, but now I intern in IT for a major company working with SharePoint, predominantly. It's less engineering and more web development, but it's helping pay for class and it's interesting. It involves using basic web design along with javascript and some Visual Basic / C#, and it's been a learning experience. The best thing I've gotten out of it has been learning to work with groups and people to make what they need work.
I would also recommend AutoHotKey, because it can help you speed up tons of tasks, even when you're at home. Lifehacker has some awesome starting guides for AHK.
Codeacademy is also a good start, but it's mostly Javascript programming. They're branching out though.
Pretty easy to build one yourself. You need 4 load cells, a load cell combinator, and a load cell indicator. They also sell them in kits like this:
testfire10 has a lot of good suggestions.
Reading ASME Y14.5 is a good start, especially for the simpler things like pins and bolt clearances
I also want to reiterate his suggestions to actually measure out tolerances when thinking about them. I found it helpful to have a feeler gauge at my desk (in addition to other measurement tools).
For books, I like to suggest Designing Cost Efficient Mechanisms by Kamm. It's not about tolerances per se, but it's about how to design mechanisms so that the tolerances you need are less complicated and/or less critical.
I recommend all books by Cengel including Heat and Mass Transfer: Fundamentals and Applications
This review from amazon is apt:
>Be very competent with differential equations, basic thermodynamics, and fluid mechanics, because winter is coming.
If you don't want to do the math then you either hope someone on reddit does it for free, or pay someone to do it, or forget the math and do some testing.
Like any good engineering problem, more details would be super helpful here. What is it you're trying to power, or even do here? You said you want it in the cable from the battery, but that would put it in the engine bay making it a lot more difficult (heat isn't great for electronics). Is there anywhere else you could put the converter?
The simplest solution is to just get an adjustable buck regulator off Amazon: https://www.amazon.com/WGCD-LM2596-Converter-Adjustable-Supply/dp/B01NCRYXEW/ref=sr_1_5?ie=UTF8&qid=1511281397&sr=8-5&dpID=512DEUtgDgL&preST=_SX300_QL70_&dpSrc=srch
It will just solder in place, and you can cover it in heatshrink to make a decent assembly.
As someone working in the UK, my company works to BS8888 for technical drawings, not the ASME code. The guide is pretty useful, it's £38 on amazon: Amazon Link
There are a lot of good flashlights out there, and some good recommendations here already...so I'm going to go against your stated preference and suggest something like these.
The emitter on those is very bright, you can focus it, the casing is reasonably hardy, I've used them underwater (they don't always survive the next day) and they're so cheap that I don't care if they break, I lose them, or I drop them in crude oil. You can use a rechargeable battery if you want...no, they won't take an 18650 but if you just need light they work very well. They last as long as I need them to last, they cast plenty of light to see when I'm crawling around in a piece of capital equipment, and they're replaceable as all get out.
My primary requirement when I went looking for these (and I got the emitter recommendation from /r/flashlight years ago) was that they were small and cheap. These are exactly that.
If you want something fancy to show off go elsewhere. If you want lumens bragging rights, buy something else. If you just want something that does a damn good job and that you don't have to get attached to because you do work that's eventually going to kill it? I highly recommend the little buggers.
Also good for kids to play with and lose. Be careful about buying direct from China, sometimes it won't show up. Just shop around for less than $5 per unit and at least fulfilled by Amazon rather than from the seller direct. Prime is even better because you're more or less guaranteed to actually get the shipment. I've had to get a refund twice when buying a drop shipment from China. Screw that, just buy the Prime ones.
Use a peltier cooler if you want to avoid a complicated refrigeration system: 12V 180W Semiconductor Refrigeration Cooler Thermoelectric Peltier Water Cooling System DIY Device with Fan https://www.amazon.com/dp/B075HBR47J/ref=cm_sw_r_cp_apa_i_byuECbJQ8B5FC
Hopefully you aren't making drugs, making me an accomplice, if so send me some money or drugs.
This is an amazing growth industry to be in right now. If you don't have a DataCenter Background, you should consider getting familiar with the common terminology and metrics. PUE, WUE, etc.
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Absorb industry blogs like EC&M and Mission Critical.
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Understand design redundancy (N+). Understand the way different cooling systems are utilized: Chillers, Adiabatic, DX.
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Energy optimization initiatives (Rack containment)
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Understand the application and use of integrated/industrial controls and SCADA systems.
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This is a great book to reference:
Millennial here
I love RPN, because it is more or less the only reasonable way to work with multiple variables on a calculator. Without it, I'm usually writing things down, to type in later. I view the need to use a piece of paper, with a calculator, as a design failure.
I also use an HP-48 emulator as the calculator on my phone. Apple will not allow it on an iPhone, which is why I do not recommend them to co-workers.
My area of study is fiber reinforced plastics, but I see some similarities in the problem. Honestly, I'd recommend checking out some of these papers on Google Scholar to get a feel for how fibers interface with a matrix. http://scholar.google.com/scholar?q=fiber+matrix+interface&hl=en&as_sdt=0&as_vis=1&oi=scholart&sa=X&ei=HM1yUZuCIMWT2gWM94HgDw&ved=0CC0QgQMwAA
Not at all. In fact it starts at Logic gates.
Website has content for free: http://www.nand2tetris.org/
The hardware portion is also a coursera course: https://www.coursera.org/course/nand2tetris1
You will go from learning simple logic gates to designing CPU and RAM and such. It is an excellent course and I highly recommend it!
I would ditch the metric system. The US standard system makes reverse engineering of our technologies difficult for some countries.
http://hackaday.com/2016/03/10/stolen-tech-the-soviet-superfortress/
What this shows is not wheel aerodynamics, but in fact the kinematics of a flat disc. Still interesting in its own right, useful for studies in machinery for example.
Aerodynamics depends on factors such as Reynolds Number (dependent on velocity, geometry, viscosity and density). Non-creeping flows would contain turbulence, for example behind the spokes, which would interact transiently. Your analysis is not really comparable to CFD, which needs to use a numerical approach.
Environmental Engineer Here.
I've done college-level projects with water filtration. You can definitely buy activated carbon at pet stores in the aquarium section or sometimes home improvement stores have them in the pool section.
No idea what you're trying to sorb into the activated carbon but here's a few to get you started:
Basic Carbon filter design: Retain as much pretreated water as possible in contact with the carbon filter. Sorption onto activated carbon depends on the concentration gradient of the water and how clean the carbon is. Also fine ground activated works better than granular due to larger surface area interaction.
You want to control each LED separately? So you're basically building your own Jumbotron.
This is getting complicated. I thought you were talking about using relay contactors for that? Might I recommend you try switching transistors? Contactors are going to be $$$$ and unreliable at high frequency switching on those scales.
I sketched a quick diagram for you. See it here: https://www.dropbox.com/s/7u0vg3he5h6wrtj/001.jpg. The advantage of this design is less conductor, much lower amperage conductors if you use say 48V, and better control of the circuits. Disadvantage, it's not so brute force as your original design and so there's some sophistication in control of the current bypass portion (the resistor banks on the right side) and the filter designs (the cap / resistors in series.)
I'm not a pure circuit designer by trade. I know enough to know that what you're planning should probably be more of this flavor, but a proper circuit engineer who does this day in and out will probably have twenty pointers for me.
As a heads up, fires tend to be caused by too much current or insulator failures at the sorts of voltages (>120V) you'll be considering. The odds of an arc unless you start by dead shorting something are pretty much nil.
We typically use a table like this http://www.costco.com/6%27-Center-fold-Multipurpose-Table.product.11488588.html or a smaller card table with a folding chair to sit on. Folds up small for travel, has a decent handle for carrying.
I find the table approach is better than a tv tray style foldup desk as you have more room to work, spread out paperwork, etc.
Worst case scenario? Get 5 gallon and a two gallon bucket or two 5 gallons and cut the top half of one off. One is the chair one is the table. Way better than a wooden spool of wire as you don't get splinters and don't have bolts getting in the way.
ConsumerReports Summary says the pads don't work very well: Bottom line:
Pads or feet didn't cut vibration noticeably. The Steadywash sent less vibration to the floor, but the washer wiggled a bit on the upper plate, so it couldn't abut walls or a dryer. It's best to buy a washer that doesn't shake in the first place. CR Best Buy front-loaders with low vibration are the Kenmore 4027, $800, and the LG WM2050C, $700.
The washer IS an LG, or was - it died and I like everything else about the machine sufficiently enough to buy a very similar one - which of course matches the dryer too. Perhaps the new one will be better. Also, the pair are on a pedestal.
Other discussions on reddit suggest this is a tricky problem to resolve. Light loads get unbalanced easily so the problem is most noticeable when the spin cycle starts up.
FYI here is a summary of possible solutions
Actually, Audi's reliability has increased, at least that's what Consumer Reports said in 2014. Take it with a grain of salt but god do I want one
I think this download link will work, never tried this service before: http://www.filedropper.com/momentareamethod_1
Anywho, all the input parameters are at the top, OD (outside diameter), ID (inside diameter), E (29000000 is standard for steel but use the correct one for your material), a, b, and c are dimensions as defined in the excel, and P1 and P2 the loads. Orange is input, blue is output. If the field has an equation in it don't mess with it.
Everything else is set up to work. It uses moment area method.
It assumes the "beam" is simply supported.
Finally, I offer no guarantees and I am not responsible for use of the spreadsheet. It is for information only.
Edit: Please pay attention to the units on the input, I have written them to the right of each input. It caught me as I was developing the calculation. E is typically given in ksi (kips/in^2) not psi (lbs/in^2) to convert from ksi to psi multiply by 1000. This was the mistake I made and it was giving me a deflection of 8 inches. Also, think about the deflections it calculates, do they make reasonable sense.
I was an ME major in college. I realized 3rd year I wanted to do CS so I got a CS minor. That was 8 years ago. Things have changed and many colleges have different requirements on CS minors. Regardless, getting some formal CS education is extremely helpful. Object oriented programming, data structures and algorithms, and syntax in at least one common language is mandatory bare minimum. Beyond that you need classes in computer architecture, networking, databases, and information security.
If you've already graduated you can either get a masters in CS or you can teach yourself, depending on how self-motivated you are. If you go self-taught, use leetcode websites (leetcode.com or hackerrank.com are great) and books like Cracking the Coding Interview. Bootcamps can help with syntax or frameworks like react, angular, .Net, Azure, AWS, etc. Depends on what you want to do.
As Soops said, 99% learned on the job. I learned 4 languages and cloud architecture on the job, not in school. You need to find a company where you are doing mechanical-ish stuff but have the freedom to or are expected to use software in some way. Industrial automation is a great industry to start in.
I'm not huge into programming but I use IFTTT (IF THIS THEN THAT) a lot. My favorite is the location feature. I use it to track how long I'm at my shop and how long I'm at home. Every time I exit or enter that area it creates a log in a google drive spreadsheet.
They've got some other cool recipes like getting a text when the forecast calls for rain. They connect a lot of different software and they're doing more and more with physical things too like NEST and different alarm software.
Ham fests, clients that I serve who have surplus, surplus stores (depends on where you live), surplus outfits like American Science and Surplus (http://www.sciplus.com), Merlin P Jones, ebay, and believe it or not... when I am doing any design, I often just buy something CLOSE to what I am doing and take it apart. I charge by the hour, and sourcing something is often expensive compared to scrapping something new. I also call suppliers and look for samples. Usually, if a project has volume potential, they can help out. I have a fairly full kit of valves, relays, solenoids, PLCs, project boxes, wiring, connectors, nuts and bolts, raw material, and shop assets to do disassembly and mods to stuff. The issue is getting to 'done' ASAP. Toward that end, an ME kit might have a lot of things in the scale of your work... if you are doing huge things, you are at a disadvantage. For small things... lots of aluminum forms, threaded rods, fasteners, cutting and shaping tools, expendables, lubes, etc. Hard to generalize, but I've learned categories of what makes problems go away and I concentrate on have 'enough' of those categories.. not everything I'll ever need, but most of what I need to to many things.
What kinds of things do you do or want to do?
Does your school have any particular specialities?
E.G. my uni competed in Formula SAE. Monash Uni has a wind tunnel, so their speciality was aero. Melbourne Uni developed their own engine.
Books: Racing Car Design and Development.
Fundamentals of Aerodynamics
That really depends on a lot of factors. https://www.fool.com/retirement/2017/06/22/how-much-will-my-employee-stock-options-be-worth.aspx might be a good place to start but honestly you should make your own post on /r/personalfinance with the details.
They're here but they cost $5000, not so "secret". https://thenextweb.com/tech/2017/10/13/russian-ethereum-heater-cryptominer/
However, if they pay off their investment then you could give them away for free and think of it as free co-location services.
>The fact is that people who predict the future are really, really, really bad it, to the point that if they "get it", we hold them up as shining examples.
Isaac Asimov's predictions of the year 2014 in a 1964 New York Times article:
He's right about 2/3 of those.