Chuck
  • Member for 6 years, 8 months
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Can cables and wires for home internet emit harmful radiation?
2 votes

From Wikipedia: Ionizing radiation is generated through nuclear reactions, nuclear decay, by very high temperature, or via acceleration of charged particles in electromagnetic fields. Natural sources ...

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HPU minimum oil temperature
1 votes

I don't design HPUs, but I'm a mechanical engineer now and have previous experience with them. I would guess that the oil viscosity is the primary driver for its minimum temperature. Below the rated ...

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How does ferranti effect occur?
1 votes

Electrical impedance and acoustic impedance take the same form mathematically, so I personally find it super helpful to think of electricity in terms of acoustics. Stand in an open field and shout. No ...

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Are these "parts pickers"? "JLF" and "Little Joey"
2 votes

I'm reading company training materials and I don't understand a few terms. So I'm sure that alephzero's answer is probably correct, but you're reading company training materials. Acronyms and jargon ...

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How to mount a rod (rotating)?
1 votes

How do I fixate the rod onto the ceiling without stopping it's rotation? With a thrust bearing. A conventional bearing supports radial loads; a thrust bearing supports axial loads.

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Controlling temperature using PIDs on two separate controllers
2 votes

Ideally, I would imagine there would be sufficient material in the burner and the fan speed would be the only thing to modulate to regulate temperature. If that's the case, then I would have the ...

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How to compute the size of a polygon moving along non-circular guide rails
0 votes

There's no uniform radius of curvature with your shape (c) so you can't have a closed series of rigid linkages that's capable of moving around the track. You can use a flexible link or cart as a ...

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What happens when an LCD screen shuts off?
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1 votes

There's two different "shut off" methods: showing a black screen and actually powering off. To show a black screen, the backlight stays on but none of the pixels are energized. Light that gets ...

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Why are tri-axle trailers with single wheels more stable than double wheels?
Accepted answer
3 votes

If the load is evenly distributed, then double wheels would be something like: [Mg/4] [Mg/4] [Mg/4] [Mg/4] \/ \/ \/ \/ [tire] [tire]--------------[tire] [tire] ...

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Why is Mach 0.3 the threshold separating compressible and incompressible flow?
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11 votes

Wikipedia gives the reason for Mach 0.3 as due to the fact that this achieves ~5% change in density. I found a NASA page that describes (analytically!) the relationship. I cited the source, but I'll ...

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What is this captive screw and barrel nut adjustment assembly called? Picture attached
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6 votes

I never quite found exactly what I'm looking for, but I did come close, so I'll post what I've got. If anyone ever does have a better answer, please post it and I'll accept that one as correct. The ...

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Voltage controlled switch?
1 votes

I believe you are describing a charge pump. You don't give any specifics on what you're trying to do, though, so I can't really give meaningful feedback on anything else. Generally speaking, though: ...

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Deriving the equations of motion for free-floating spacecraft with a single link robot arm
0 votes

Sorry I missed this over at Robotics. Your question is really unclear and you don't have a good diagram that helps it out at all. You say there is no gravitational field, there are no springs, there ...

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Dynamics of a rigid body in a system of two linear drives
0 votes

I am having a really hard time following your setup. First, you have the x-axis as the vertical axis, and the y-axis as the horizontal axis. Is this correct? And then there's a... surface?... when x = ...

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Damage differences in frontal collision of two vehicles and their speed
0 votes

Can the difference in damage be attributed to much different speeds of the two vehicles? Which speed? If the cars hit each other, then there is only one speed that matters - the speed of car A ...

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How to calculate the max torque due to angular momentum of a beam given motor specs
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1 votes

is it possible that the torque generated from the momentum of the beam I'm going to stop you right there. Momentum doesn't generate torque. Momentum is moment of inertia times speed. Torque is moment ...

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Practical rugged method for elevating water 7 feet high?
2 votes

Winch the bucket down, fill the bucket, then winch the bucket up. You're not trying to move this some huge distance, and it's not some huge reservoir to move. A pump is overkill. You could, ...

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simulation of an attitude optimal Backstepping controller based quaternion for a UAV in MATLAB
1 votes

That is quite the wall of text. You don't need to rewrite an entire academic paper to ask a question (please don't). You failed to show what it is you thought you were supposed to get or what you ...

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Git, Mercurial, others -- what's the best system for an engineering team new to version control?
1 votes

Source control isn't going to fix your problems. Let's review: We don't have a way to allow multiple people to work on different components of a model simultaneously. Why do you have multiple people ...

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What is a Butterworth filter?
2 votes

This.... this is the content of most of a semester on digital signal processing. You said, "I found [a book on signal processing], but it is a book of 700 pages with plenty of math." Well, yes. ...

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what's wrong with this robust control scheme?
0 votes

Where's the rest of your block diagram? It looks like you have a polarity problem - You give a step of +1 and your pos_meas_Hinf goes down instead of up. Nothing you've shown in your diagram looks ...

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Why didn't the Fukushima turbine supply electricity to the residual heat removal system?
Accepted answer
2 votes

According to the Wikipedia entry: [The earthquake] produced maximum ground g-forces of 0.56, 0.52, 0.56 (5.50, 5.07, and 5.48 m/s2) at units 2, 3, and 5 respectively. This exceeded the earthquake ...

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3D Transformation Between Two Cartesian Coordinate Systems Using Euler Angles
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4 votes

Suppose Frame 1 is a world coordinate frame and Frame 2 local robot frame. The thing that's a little confusing here is that when you transform from Frame 1 to Frame 2, you are saying that you want ...

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Designing a Parallel Robot by Autocad
Accepted answer
1 votes

I can only answer the question you asked about. You asked about a spherical joint, so I'll give advice about the spherical joint. First, are you using Autocad? That looks like Inventor. They are two ...

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How to model a sheet metal nut in SolidWorks?
1 votes

I can't tell what you want. A combination of a part and forming tool What? I want to drag this part into a closed sheet metal area and the holes for the nut should be created automagically ...

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Physical principle behind suction of a piston
Accepted answer
4 votes

The ideal gas law says: $$ PV = nRT \\ $$ where $P$ is pressure, $V$ is volume, $n$ is the number of moles (molecules, basically) of gas, $R$ is the ideal gas constant, and $T$ is the absolute ...

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stability/controllability of a finite time linear quadratic regulator
1 votes

How do you have an LQR with open loop control? I know that there would be these requirements if I were to implement a closed loop control A linear quadratic regulator is basically a multi input ...

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How much of a battery needs to be replaced for it to be a fresh battery?
Accepted answer
2 votes

One plate is lead, one plate is lead dioxide. Hand-waving a big: sulfuric acid dissociates in water, making a lot of hydrogen sulfate ions. The lead plate reacts with the hydrogen sulfate to make lead ...

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Accurately measure a bolt hole circle?
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3 votes

The bolt pattern should be a standard; if there are three bolt holes then there should be 120 degrees between each hole. If there are nine bolt holes then there should be (360/9) = 40 degrees between ...

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Why is soot produced in diesel exhaust, since diesel runs lean?
5 votes

From the Wikipedia article: All diesel engines can be considered to be lean-burning with respect to the total volume, however the fuel and air is not well mixed before the combustion. Most of the ...

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