All Questions
Tagged with electrical-engineering mechanical-engineering
287
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What are the fundamental limits on the accuracy of a railgun in space?
I can't find anything on the fundamental accuracy limits of the system. I want to know how precisely the projectile coming off the rails can be aimed, probably using a plasma contact armature (because ...
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31
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Fixture to hold and deliver current to crystal cathode in vacuum chamber
At my internship, I have a small crystal (about 5-8mm long by 2-5mm thick) that needs to be mounted in a vacuum chamber (which is 35mm on the inner diameter) to serve as a cathode with 1.0 to 1.5A of ...
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Battery thermal loss
A copper bus bar is subject to a short circuit current of 500 A for 10 s. The section of the bus bar, through which the current flows, has a length L = 50 mm and a cross section of A = 20 mm^2. ...
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2
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2
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365
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Will a bare wire encircling a tent and connected to a tall metal rod help to protect the tent from a direct lightning strike?
I am planning to go camping later this month and I am concerned about lightning since the campsite I will be staying at is located on flat terrain in a rural area in Illinois. This campsite is located ...
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Can this new AC motor/generator design work?
I'm currently in the works of developing a vertically suspended flywheel, and I'm trying to figure out the best method to convert rotational energy to electrical energy and vice versa. I don't want to ...
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How to calculate the torque disturbance of an unbalanced flywheel?
I would like to understand how an unbalance of a flywheel affects the dynamics of a simplified mechanical model.
Assuming that the mechaincal dynamics can be modeled as (neclecting inertia of the ...
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41
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How do I calculate the thrust output of a high bypass turbofan engine? (7th grade)
I am trying to create a small version of a high bypass turbofan engine but I can't seem to find any materials that show how to calculate thrust but on a 7th grade level. If anyone here can help me I ...
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27
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Three-way energy harnessing device engineering
I have a question regarding a certain engineering of a such device capable of harnessing energy in such three way. So, what I want to happen is to implement a solar and motion energy harnessing. The ...
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1
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Seeking Manufacturing Advice: Low-Dose Powder Dosing Device
Hi everyone,
I'm working on a project that requires a device to dispense a very small amount of powder (around 1 gram per second) in short bursts. Ideally, the device would "sneeze" the ...
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40
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How to measure the rotation direction and speed of a ring on a finger?
I am trying to create a device that can measure the rotation of a ring on a finger. Basically there's going to be two rings on the finger, one that rotates and one that is stationary. The idea is that ...
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What will happen if you attach the negative pole of welder to the rotor of the motor or the body , will that cause problem?
I have built a machine that rotates a cylinder to weld it, I have to attache a negative pole to the cylinder which is connected directly to the rotor of motor, the motor is controled by an Abb vfd ...
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71
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Principle of RF MEMS switches
I am studying mechanical engineering at university and am trying to design an RF MEMS switch. In "RF MEMS Switch Li-Feng Wang, Qing-An Huang, and Lei Han" says "When an adequate voltage ...
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32
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Electromechanical connection for lamp
I need help with a project and would appreciate any advice or recommendations you can provide. I'll do my best to explain my concept and the issue I'm facing. Concept: I have a pad with a heavy ...
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1
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1
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69
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Confusion regarding SI units of K (stiffnes)
I know that stiffness, K is equal to product of moment of inertia and square of natural frequency
K = Jωn2
Where K = stifness, J = moment of inertia and ωn = natural frequency
SI unit of J is kg m2, ...
- 273
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2
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Controlled oscillation of a piano string by electromagnetic, mechanical, or other means
What would be a good way to actively control the loudness of an acoustic piano note over time after the note has already been struck by the hammer, such as by actively changing the amplitude of a ...
