ConjuringFrictionForces
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Units for rotational impedance
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9 votes

Radians and unit analysis The comment by MrYouMath is correct. For the purposes of dimensional analysis, the radian is considered a dimensionless quantity and therefore does not need to be included. ...

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Square wave transfer function?
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5 votes

I thought I would expand a little on the answer offered by Karlo. Long story short, I would not try to calculate the analytical time response of a system to a square wave. That would be a serious ...

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How should I go about adding holes to laser or water jet cut sheet metal?
4 votes

Similar to OpticalResonator's answer, I would suggest using the laser/waterjet cutter to mark the hole locations (although you can always mark the holes manually after cutting). You should probably ...

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How I can compute cutting processes with continuum mechanics?
4 votes

Real-world engineering example To my knowledge there are no simple analytical methods of determining whether an object such as a sword can cut cleanly through any arbitrary object. In manufacturing ...

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Why use non-dimensional coefficients?
4 votes

There are two major benefits to dimensional analysis (non-dimensional coefficients) according to Frank M. White, Fluid Mechanics, 2nd Ed. My answer is heavily paraphrased from this source. They allow ...

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Design op-amp circuit from transfer function?
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4 votes

To my knowledge the simplest way to accomplish the transfer function... $$ G(s) = \frac{E_o(s)}{E_i(s)} = \frac{0.0364s}{0.0002s + 1} = \frac{KTs}{Ts +1} $$ ...is the following high-pass filter ...

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Speed estimation with absolute encoder
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4 votes

You have stumbled across the fundamental problem of using an encoder to measure speed: they are not great for measuring low speeds. Why is using an encoder to measure speed an issue? The encoder ...

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Calculating Load Inertia in a Leadscrew System
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3 votes

Firstly, in reference to nomenclature: in ISO (metric) standards the pitch of a leadscrew is given in units of distance/revolution. However, Unified (inch series) standards, pitch is given in TPI (...

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The finite step response of a system pole at the origin is unbounded, how is this critically stable?
2 votes

The main issue here is a misunderstanding of how stability is defined. Stability is not defined by the step response, but is instead defined by the system response to initial conditions (or an impulse ...

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How to select the correct grinding wheel type for precision grinding of tool steels?
2 votes

Here is what you need to know when selecting a grinding wheel. My experience is in manufacturing research and I do not know much about the specifics of knife making, but there are some general rules ...

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Stiffening of Tesla turbine rotors
2 votes

I don't know much about the operation of a Telsa Turbine but I can talk in general about what affects the stiffness of an object. Short answer The geometry of the disc and the material of the disc ...

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Relationship Between Gear Ratio and DC Motor Power Consumption
1 votes

The question is not answerable using only the equations and constraints given. However, we can get close to the answer. Power out of the motor Mechanical power is calculated by: $$P = Fv = mgv$$ ...

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System Identification 1-d altitude control
1 votes

It appears that you are trying to derive the transfer function of the system, that is, the input/output relationship in the frequency domain for zero initial conditions. $ G(s) = \frac{Y(s)}{R(s)}$ ...

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Model-based Ziegler-Nichols tuning of a hover PID controller
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0 votes

Ziegler-Nichols tuning will not work for this system because there is no energy loss. The reason that your system oscillates regardless of the value of $K$ that you choose is because there is no ...

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