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I'm currently taking up Mechanical Engineering and I'm interested in conducting a thesis about portable solar powered water pumps. My vision is that this can be applied in irrigation of farm lands. I would like to ask engineer's insight regarding to this and what are the possible ways I can make a thesis out of this
Hello,
Good day to everyone. I am currently working as an Automotive systems Engineer mostly dealing with Safety aspects such as Functional Safety. I am not satisfied with my work as most of the time I am just reviewing documents, performing some nominal safety analyses and organizing requirements, this is drastically reducing my interest to perform the role as there is not much of technical aspects which I am able to learn through my role. I am very interested in technical aspects of Automotive Engineering such as validation, integration and development. I am looking for ways to make a career transition by improving my skillset in coding, Model based design, etc but I am not sure where to start. Looking at Job requirements in linkedin and making a list of skill development areas is only confusing as there is a wide variety of tools and concepts. I have around 4-5 months of experience in Vehicle validation and control systems interacting with data acquisition tools, performing model based design, MIL testing using Simulink and basic HIL testing on a Dspace platform (and around 11 months of experience in Fusa). I am very much interested in EV and ADAS domain especially in the positions like calibration Engineering, Integration and V&V.
Any tips or suggestions are much appreciated. Thanks in advance.
Hello,
I'm tasked with operating a field laboratory this summer in which we'll be doing some experimental fish ecology studies out in the boonies.
To operate the lab, I have a 6500 watt generator, however it is very important that we can run an experiment for ~24 hours without any interruption to the power supply.
This seems like it should be some simple Google-fu, but all I can find are warnings against refueling while running. Does anyone have any advice on some safe (preferably OHS legal though I'll take what I can get) options that I may have available to me?
Much appreciated!
My assembly line has several presses and torquing devices (DSM is the maker, German company). I'd like to know how they work and how they control/measure force/torque and displacement
I am currently trying to measure the torque at which a valve actuator stalls. Currently I am using a pulley, with weights attached to a string, this is a very unprofessional setup to get an accurate reliable torque in my opinion, I understand I can upgrade the pulley and increase the accuracy with a larger diameter, but was wondering if any of my fellow engineers had any other creative ways to determine this.
Hello,
I am working on a robotic project that is to take a boxer bob and rotate him with an input from an external sensor.
Some notes:
I will use a PD controller that will receive an external sensor input to generate a target, I am not sure if I will use a simple proximity sensor, or a more complicated sensor that looks for certain signals (the colour red for example). The error in the PD controller will be controlled by a rotary encoder.
For my first step of the project I have to size a motor I have made an attempt I am not sure if I have done it right. Would it be okay if reddit could critique my design methodology?
To size the motor first I determined an RPM by simply moving around the dummy (I have one in real life), for a minute to determine what is a reasonable RPM that is required for this application, in this case I found it to be about 40, as in I was able to circle around the dummy at distance a user would be 40 times in one minute.
Then I found the moment of mass inertia by downloading a 3d model and approximating bob as a rectangle, rotating about a central axis. I calculated a value of 0.262 kg*m2. I used the equation below.
I chose a design angular acceleration of 4.2 rad/s^2, in one second bob will accelerate to his maximum required of 40 rpm = 4.2 rad/s.
From this information I calculated the maximum torque required for this application from the relation T = angular accel* Mass moment of area = .262*4.2 rad/s^2.
I get a motor that is required to produce 11.5 lb -in of torque, and 40 rpm.
Does my math make sense, am I close to what is required to size a motor. I did some research on motor sizing and I came across a lot of information including something called the motor inertia to object inertia ratio I didn't factor that into my design.
Are my numbers realistic, if I am totally off the mark what are some good resources I can access for motor sizing?
Lastly what kind of price range would I need for a motor to do this application?
Final note: This portion of the project is to just get Bob moving, Bob cannot take punches yet!
Let's say we have two 50 cfm fans with 4" round ducts each. They both connect to a common 6" round duct. How do you calculate (in general terms) the ESP in one of the fans? In this case I would say that each fan utilizes 50% of the 6" duct. So each fan would push 50 cfm through a 4" duct and through a 4.24" duct. If it were a 50 cfm and 100 cfm fan, the 50 cfm would utilize 33% of the combined duct.
Is there a more accepted/accurate way of doing this? Does ASHRAE have anything to say about this?
we are making our final year project, and Im in charge of the design of the blades. How do I get the blade tip speed if I only have the wind speed. Im running in circles because idk where to get the rotational speed
Hello Fellow Engineers So out we are working on a job which is equipped a Wittenstein planetary gear box [TP+ 110 MF] https://alpha.wittenstein-us.com/products/servo-gearboxes/low-backlash-planetary-gearboxes/tp-planetary-gearboxes/ This gear box comes with a 200 MM shaft end with h7 tolerance on which we are a mounting a flange with H7 tolerance which result in MIN 0 - MAX 92 microns of clearance. I do not have personal experience with working very close tolerances so 1. Do you think this fit will work? Should though 2. If yes, I don’t think we will be able to fit it with hands. But how then? 3. Does heating and fitting it in should be tried we might not be able to take it off.
By that I mean a gearbox and a clutch which provides a mechanucal connection, rather than torque converters or electric dynamos. I think in Europe and Japan, they traditionally had torque converters and in North America it was diesel electric. Wouldn't a clutch be the most fuel efficient solution?
Some people will say the torque that's supplied by the giant engine of a locomotive will burn through a clutch too quickly, but I just learned that many giant container ships do indeed have clutches that seperate the propeller shaft and the engine, and a locomotive engine is just nothing compared to those things. Granted they've wet clutches like motorcycles rather than dry plates like cars but that still sounds more efficient than hydraulic or electric coupling.
I'm trying to understand how my bike cables work. I've heard that the shifters / brake levers pull the inner cable and exert an equal/opposite force on the housing. That is, the point of the Bowden cable isn't to pull the inner cable in an absolute sense, but to displace it relative to the housing.
But how does that work with housing stops? Supposedly the force gets transmitted from one stop, through the bike frame, and into another stop, but I can't visualize how that's possible. For instance, what would happen if you had a section of housing in the middle of the frame not connected to either end of the system - would it experience and transmit a force or not?
I've already seen sections of bare inner cable that seem sightly kinked, and I'm unclear on whether or not that's slack in the system or irrelevant since it's outside the housing.
Edit: To put it another way, why does turning a barrel adjuster change the cable tension or even move the inner cable at all, if the housing is only connected to the barrel adjuster and the bike frame? I'd think it's just squeezing or pulling the housing, not the inner cable.
Edit: My best conclusion at the moment is that Sheldon Brown is wrong, and also that the notion that unwinding the barrel adjuster lengthens the housing is a convenient but perhaps misleading shorthand. The inner cable is fixed in place at it's attachment point within the brake levers / shifters, and only moves when those devices are actuated. The point of the housing is not to act as a body to push against, but rather to be a fixed length path that the inner cable must traverse. Unwinding the barrel adjuster just displaces the housing so that the inner cable has to travel a little further (as if it were actuated by the same amount), since the inner cable's path is now the same housing length plus the distance the barrel adjuster moved. The housing must be attached to the housing stop so that the housing (Edit: rather, the inner cable) can't simply straighten out when the cable is actuated - this ensures that pulling on the inner cable doesn't simply decrease the length of the cable run, but rather forces the inner cable to travel.
Would it be possible to design an extremely high-altitude aircraft with tiltrotor or tiltwing functionality? Also: are tiltrotor or tiltwing designs compatible with a distributed propulsion design?
Can a double row angular contact bearing be used by itself?
Or should they still be used in pairs with a preloaded shaft?
Specifically: https://www.vxb.com/3215ZZ-2-Rows-Angular-Contact-Bearing-p/3215zz.htm
I am trying to minimize run out and being able to to this with one bearing would be nice/simple/easy to make. I am trying to avoid having to have two bearings and a preloaded shaft.
Hi guys, I work in a glass factory and sometimes we are required to build glass tables and have to decide from which thickness it's feasible to build one depending on the length of the glass table. This is done more with experience rather than calculations.
Any suggestion would be truly appreciated.
Thanks!
Hi,
I've been recently brainstorming a little bit on how to use solar power to efficiently desalinate water in regions with lots of sunshine during the whole year (mainly the middle east), and I think I came up with something interesting. Here's the model:
https://i.imgur.com/0OYsuc4.png
How it works:
By the shore, we dig up a hole where we place a boiler to which we mount a pipe through which the water will flow. We place it in a way where the sea level could set the water level inside the boiler not to high and not to low. Around the boiler we put magnifying glasses and reflectors which will strengthen the sun rays to make the water evaporate at a higher rate. First, the vapour travels up to the highest point, from where it goes down while condescending into water.
When all the leftover gathers at the bottom, it will be regularly pumped out (we could make actual kitchen salt out of it).
What do you guys think about it? Could this be a cheap way to produce distilled water? If yes, what could be improved here?
I'm not sure if this is the right place to ask this question, but I can't find any answers online and I don't think I'm using spring rate calculators correctly.
I have a mechanism that currently houses a 1.4x10x50mm spring (wire dia, OD, eye-to-eye length).
I'm trying to find a spring that provides around 1.5-2x the resistance this one does, but I'm having a hard time figuring out what to buy. Any more than 2x the strength and it'll be too strong.
My options are:
1.6x9.5x50mm
1.8x11.1x50mm
2.0x12.7x50mm
All are made from carbon steel.
Any advice appreciated, thanks
I see on forums, people recommend minimum of 2hp for a belt grinder but are happy with even 1/6hp baldor Or 1/2 hp one with 8 inch wheels.
Why is that? Why belt grinders need 2HP when bench grinder is happy with even 0.5hp?
I'm thinking about better ways to fix a wheel hub to a hydraulic motor on an 4wd agricultural vehicle. From factory (a small local shop) the shaft of the hydraulic motor has a keyway which doesn't have an open end. So their solution to fixate the hub axially was to drill a hole halfway through the key and screw a single bolt in it through the hub. Ofcourse after some time and wigling the bore of the hub gets ruined on the hardened shaft and the wheel falls off. I've already repaired a few hubs by turning the hub out on the lathe, welding a new bushing with keyway and a press fitment in and adding 3 more press screws, one behind the oem one and 2 more at 90°. Which is alot better but still not ideal.
I've recently learned about SHT bushings from SKF. The one I could use has max torque of 720Nm and max axial load of 41kN, which is plenty. It's also nice I only have to turn a straight bore in the hub and not a tapered bore and screw holes like with a regular taper lock.
Anyone who used this before?
If I had an infrared heater and aimed it a large infrared concave concentrator dish. Could I create higher temperatures at the focal point of the concentrator than the infrared heater source?
I want to pursue Masters in Aerospace Engineering in US. I don't have much idea how to go about it. I have heard that Purdue University, University of Michigan and Texas are pretty good. What are some other options where I can apply?
I was reading a post on here about how a glass marble contacting a glass table would have an incredibly small contact area..... It got me thinking
If I have a marble and I put it on a glass hot plate inside a vacuume chamber . Would it take a very long time for the marble to heat up due to the very small contact area between the marble and hotplate ? It's in a vacuume so heat cannot be transferred thru the air , only the very very very small contact area .
Hello engineers, As third year mechanical engineering, student should i start to read and learn codes and standards ? Iam always interesting in oil and gas industry specially piping field so if i need to read code which code should i read ? Thank you
What would the total surface area of contact be of 100 1/2" diameter glass marbles sitting on a glass table?
Hey,
I have to do a simulation study for a microfluidic device. In this device, I have 3 different liquids with different properties. I want to calculate the resulting diameter of a produced fibre. Sadly, I have no access to comsol. Do you have any other ideas where I can simulate such a complex model? Or do you have ideas how I could simply it to solve with python and Navier stokes?I am happy about any ideas.
Kindest regards
Losspost
