3 votes

PID tuning without a plant model on a slow system

Thermal systems are really hard to tune up, and often the solution involves not just PID tuning but also physical modifications, like changing sensor position, adding insulation, adjusting the heating ...
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2 votes

How does this phase advance loop filter work?

Without C12, R29 and R21 form a voltage divider with flat phase. With C1, you get a phase advance to AC waveforms. The effect of this would be more clearly shown by drawing the Bode plot for the whole ...
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2 votes
Accepted

What does it mean when a controlled system is supposed to react twice as fast?

for a plant of second order, can you even measure how fast it reacts? Yes, you can measure this accurately and easily. You apply a step change demand and see how long it takes the plant output to ...
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1 vote

PID tuning without a plant model on a slow system

You have a pretty complex problem. It is possible that it can't be solved with a single-point PID loop. Here's how I would go about it: First, you must set the parameters that you can control. Any ...
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1 vote

Voltage transfer ratio of series RC network

The only thing that can be done (is defining an Impedance matrix ...) or varying the "Load" R3 at output as a parameter. So, you can define a function Vout/Vin (load included !), but when ...
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  • 5,856
1 vote

Stability in a double-pole system

Because you add feedback around the native double pole system. This makes the characteristics of the system different from those of the L.C alone, and necessitates loop compensation.
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