# Questions tagged [control-systems]

The tag has no usage guidance.

274 questions
Filter by
Sorted by
Tagged with
1 vote
69 views

### Why a differentiator is unstable from pole zeros view point?

A differentiator with frequency response $j2 \pi f$ is unstable because as frequency increases its response becomes out of bound. But from a pole zero point of view a differentiator just have zeros ...
35 views

### How do I reduce a block diagram with just a line as a feedback loop, I dont get how it adds K to the denominator

How do I reduce a block diagram with just a line as a feedback loop, I dont get how it adds K to the denominator. The bottom equation is supposed to be the answer.
78 views

### Transfer Function Estimate

This is related to this post: https://engineering.stackexchange.com/questions/56050/obtaining-the-open-loop-gain-estiamte-the-gain-and-phase-frequency-response Using python, I would like to write a ...
12 views

### Difference between H2 control and input shaping

Let us assume a system with external disturbance to reject. The system that is used for controlling has vibrations, that we would like to avoid. We assume moreover that the dynamics are known (10% ...
43 views

### Direct and numerically robust conversion from zero-pole to state-space representation

Note: this question was initially asked in a different community. Encouraged by the comments, I decided to cross-post here too. Given (z,p,k) my goal is to convert to a state-space representation (A, ...
69 views

### Finding the region of stability of a system

Suppose we have a closed loop system controlled by some microcontroller $K$ First we take the open loop gain which is $\frac{K}{s(s+6)}$.It has 1 pole at the origin and at $s=6$ and 0 zeros. So we ...
36 views

### Converting simulink PID block to C code

I have implemented and tuned a PID block in a simulink model and now i want to convert this block to C code to use on my micro controller I have taken the discrete equation of the PID block and the ...
28 views

### Max input of a system given it's transfer function and an assumed step change (beginner)

I have an exercise that gives me the following transfer function $$\frac{0.5}{s+0.5}$$ and an assumed step change in the target of 20 I am asked to calculate the maximum input for the assumed step ...
46 views

### What equations do I need to find the requested parameters?

Consider a filter of the form $$𝐹_{posic}(𝑠) = \alpha_1+\alpha_2e^{-sh}.$$ Find the parameters $\alpha_1, \alpha_2 \in \mathbb R$, and $h > 0$ such that $P_{\theta\phi}F_{posic}$ is an FIR (...
41 views

### Controllability matrix is full rank identity matrix

What does it mean, when my system has controllability matrix that is full rank and identity matrix? Having full rank means that the system is controllable, but does the Identity feature of my ...
1 vote
119 views

### How to implement FLL / carrier recovery? Code and math included

There are lots of options in textbooks, youtube and website blogs. There seems to be three options: Calculate phase difference between samples to infer frequency error or offset. Calculate phase ...
1 vote
52 views

### How to determine if a system is minimum phase or not?

I'm studying for an exam and this is an old exam question that I don't understand: Is the following system non-minimum phase? $$G(s) = \frac{e^{-2s}}{s+2}$$ I can see that the real part of the pole is ...
44 views

### Implementing digital controller in the time domain

I have simulated a digital control system in the Z domain using MATLAB and I have got satisfactory results. However, when I converted the plant and the digital controller to difference equations and ...
53 views

### Python package to manipulate linear systems

I'm doing some control system work. I was shocked* -- shocked to learn that while Scipy has some nice linear systems classes, they don't extend to computing the cascades or paralleling of two systems....
86 views

100 views

### Designing a controller with hard output limits

I'm trying to put together a control algorithm to use a heater to drive a 2nd order thermal system to the target temperature as quickly as possible. I've done a nice state-space model with an extra ...
1 vote
48 views

### Stability concerns for closed-loop systems

I came across the statement Stability is a big problem in closed-loop systems, where a system may tend in some instances to overcorrect errors and cause oscillations. I wish to know some examples in ...
206 views

### Realize the given system in cascade form of 2nd order section in signal flow graph representation(with complex exponents)?

I know how to solve cascade form for normal case, but I don't know how to solve cascade form if I get complex exponentials. How do I solve this? Can you provide me 1 solved example or some hint or ...
442 views

### Kalman Filter: How to Define Inputs and Outputs of a Model

I'm a software engineer with a CS degree working in machine learning. I'm trying to learn about Kalman Filters. In this short YouTube video from Mathworks, there's a discussion on a Kalman Filter with ...
61 views

### Are there control loops that attempt to maximize a process variable?

I'm working on Remote-Procedure Call (RPC) server that processes incoming streams of data from clients, and looking for a way to set a limit on the number of simultaneous streams allowed. There is ...
1 vote