# Questions tagged [control-system]

A system that may be electronic circuits or even software that uses control theory (principally differential equations) to control an output by monitoring various aspects of the system under control and varying inputs all towards meeting a defined goal. Some famous examples are controlling a rockets thrust angle to ensure directional control.

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### Digital control stability for more than impulse response stability?

I have a digital control system which is described by the transfer function $$Y(z) = \frac{-\beta}{z - 1 + k \beta} X(z)$$ where $\beta$ is a real parameter I can adjust to modify the ...
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### How do you split a summing point into two?

I am solving a control system example on block reduction rules and stuck on this particular step. According to me, I can move the summing point ahead of the middle block to get G4 multiplied to both ...
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### Feedback systems using passive systems

I started reading control system (book) just a few days ago , In the derivations of equivalent transfer function of Cascade or feedback connections it assumes that "The subsystem connected to ...
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### Why is the error in control system calculated against input?

In control system, the error is the difference between input and output. But why are we expecting to get the output same as the input. To get the exact input as output there is no necessary for the ...
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### How can I use MC1489?

I would like to use the interface on link below. I tried to do exactly same except output because to test first, I gave output to LED from microcontroller. My question is with MC1489. When i connected ...
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### Help needed using convolution to calculate a system's impulse response

I have a circuit with the transfer function $G(s) = \frac{1}{(s+1)^2}$ and I'm asked to calculate the impulse response of the circuit. After looking into it I know that I need to use convolution ...
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### How to estimate settling time of an overdamped system?

I've been trying to figure out how to estimate the settling time of a second order system in response to a step input of magnitude 5. The systems transfer function is $$G(s) = \frac{1}{(s+2)(s+4)}$$ ...
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### Regarding PLC and several input/ output modules

I have to use more than 40 servo motors and 20+ load cells using PLC. But the problem is that I have to use many I/o modules ( that is costly and hectic). Can I reduce the no of I/o modules by any ...
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### Advice needed for a final year project on wheelchair automation and control

My project partners and I have been trying to design a wheelchair for people with neuro-degenerative diseases. I know this has been done in the past, however we are using a different approach. We are ...
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### Control system basic feedback loop, what's happening at the initial state?

How can the system output be dependent on itself, when at the initial state there is no system output? I don't understand how it can work physically.
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### How to fix triac control module?

This is scheme of triac control module. I'm using optotriac MOC3041 (T1 on scheme) and triac BTA140 (T2 on scheme). Is it possible that my control module doesn't work correctly due to too small ...
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### How to determine the settling time from a transfer function?

Given the transfer function $G(s)=\frac{(1-\frac{s}{3})}{(\frac{s}{0.1}+1)(\frac{s}{100}+1)^2}\cdot 10$, I would like to calculate the settling time. From what I've learned, this is a third-order ...
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### Best way to track light source?

I want to build a 1-D (azimuth), bidirectional optical tracker. The idea is to have two identical transceiver, mounted on DC servo-motor. The user can move the two servos on rails (reasonably fast), ...
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### Is Integral gain much use with a frequently changing setpoint?

I have a motor/encoder setup with a PI loop, where the motor needs to travel to a certain position following an accel/decel profile. The setpoint in this case is position at time T, which changes each ...
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### Ultra-narrow beam spread LASER diode

I want to build an optical position tracking system based on PSDs (Position-sensitive detectors). I searched online and found this PSD which has a sensitive area of 12 mm*12 mm. My goal is to allow a ...
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### Help with a Closed loop and zero order hold function ZoH * 1/s(s+a) type

i would appreciate some help in solving this problem, i need to find the transient response for a unit step, i have a brief idea of how to solve, but my graphs in matlab doesnt seem to fit with the ...
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### Converting an analog Butterworth filter into a discrete filter

Here again to ask about another question. This time asking how to convert an analog transfer function to a discrete transfer function using standard continuous to discrete methods. The application ...
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### Drawing Signal Flow Graph from Bridged-T Network

I am confused about where to place R1. Is it a feed-forward or feedback term? Y1 and Y2 are admittances representing the capacitors.
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### How does an active filter transfer function translate to a block diagram?

I am having troubles trying to translate when finding a transfer function of an active filter is it in a 'Close loop' or 'Open loop' state? When finding the transfer function of these active op-amps ...
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### Stability of a two poles negative feedback amplifier

let's consider this analysis of a two-pole amplifier with negative feedback (Microelectronic Circuits by Sedra Smith 7th edition): Before showing you my doubts, let's consider this introduction made ...