Questions tagged [control-engineering]

Questions about the models and theories of control engineering and the application of control theory to design systems with desired behaviors.

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effect of coupling in MIMO systems

I have a MIMO system with a 2x2 transfer matrix, for example consider: $\begin{pmatrix} \frac{2}{s+1} & \frac{1}{(s+1)(s+2)}\\ \frac{1}{(s+1)(s+2)}&\frac{2}{s+2} \end{pmatrix}$ I would ...
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96 views

Block diagram vs flow chart?

I was studying a book of control system where i read that a block diagram is a specialized high level type of flow chart So what will be the difference between a normal flow chart and a block diagram?...
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69 views

Are all close loop control system intelligent? [on hold]

Can we call all the close loop control systems as intelligent?As they somehow involve automation? Or to be called as intelligent it is must that system has AI(artificial intelligence) especially ML(...
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basic second order system transfer function - natural period and natural frequency

I have a question about general second-order system transfer functions. I notice two takes on this transfer function. One has a denominator of: $$\tau^2 s^2 + 2\zeta\tau s + 1$$ where $\tau$ (tau) ...
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38 views

Root locus: ambiguity on which branch goes where?

I could not find a Controls Stackexchange, I hope this is the right place, otherwise I would be glad to post it in the appropriate section. My question concerns the root locus method. Given a plant ...
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Controlling temperature using PIDs on two separate controllers

I have a pellet smoker, and I am customizing it for tighter temperature control. Currently, I am controlling how much material is burning to control temperature using a PID loop. I want to achieve ...
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24 views

Identification of control system type? Open loop or close loop,

What is the type of control system of door closer in attached photo?
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Adaptive feedforward cancellation (AFC) and least mean squares (LMS) for periodic disturbance cancellation

I already asked this question here, but since I did not get an answer yet I want to try it here as well: I want to implement an adaptive feedforward cancellation (AFC) for cancellation of the impact ...
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38 views

control systems vs artificial intelligence?(in nut shell for beginners)

i am confused in basic difference between control systems & artificial intelligence? since both techniques can be used for automation Please kindly try to give answer in nutshell depth/detail ...
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What are some practical applications of nonlinear control and multivariable control in the industry?

All the books I've used in my control systems class give a definition multiple-input, multiple-output systems and nonlinear systems, but all the techniques covered in the folloing chapters apply only ...
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Is learning VLSI design useful for a control/automation engineer?

I've known of a few universities that include a class about VLSI design as a part of their control/automation engineering programs. I undestand VLSI design to be about creating integrated circuits ...
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54 views

Controller vs Micro controller?

We often listen both term in electrical engineering? First one is seen in control systems course and second one in course of embedded systems But what is difference between both of these terms?...
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Turbocharger boost control using two valves with a vac and boost reference for wide boost control range

Can someone explain how the above boost control setup would work. The valve on the left uses a vac source applied to the top of the diaphram which would effectively help hold the spring closed at high ...
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40 views

PID-control of undamped system

I general, if you model a system (pendulum for example) and you do not include damping into the system (maybe caused by friction): Is it generally possible to tune a PI or PID controller for an second-...
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How can I setup a controller simulator in excel?

Is there a good excel program somewhere or basic breakdown of how to implement a control loop in excel if trying to simulate the performance of a circuit? I have data from an operating plant and am ...
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1answer
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Typical cycletime of an industry pid controller for servomotors

I am wondering the following. What are the typical cycletimes (or timesteps), that are used in real industry-standard pid-controllers (for example for assembly-robots on a car-production-line). I ...
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What non-Gaussian filter should I use

I am developing a filter to better predict my state of my system. I had previously tried an Extended Kalman Filter. I have all the data needed to predict my next step but I have few observations/...
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38 views

Does the plant transfer function of a system change with variations in the reference variable?

I am designing a PID controller for a system that requires several step changes in the reference variable (concentration of solute in a tank) over a set period of time. I can find the plant transfer ...
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Meaning of energy method in control theory

What qualifies a energy method in the context of control theory? Citing from a paper to give the context in which this expression came to my attention: One of the challenging problems of the double ...
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Auto-tuning PI controller with maximum sensitivity

I am trying to design an auto-tuning controller in matlab with the help of the paper from Astrom and Hagglund: Design of PI Controllers based on Non-Convex Optimization* (1998). They use the maximum ...
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How does a digital controller's sampling period dictate the system's actuation requirements?

When selecting an actuator for a controls application - e.g. choosing a servo motor for a self-balancing robot - I understand that it's important for the actuators to have fast enough dynamics that ...
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1answer
48 views

Closed loop guidance and control: how to tune a system with multiple feedback controllers?

I'm trying to design a closed-loop guidance system for rockets - something that can be implemented in Kerbal Space Program, for example. To do this, I'm following the design process described in ...
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1answer
35 views

Designing Block Diagrams For Control Systems

I'm looking for good software to design control systems, and more specifically to neatly design "block diagrams" for control systems. Is there something like that?
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1answer
68 views

Changing fields from mathematics to control engineering [closed]

I did my undergraduate in maths and physics and will be working in control theory for my future job. Not to my surprise, my engineering background is rather lacking. I have taken a look at materials ...
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Can i switch negative feedback to positive feedback in PID control?

I am learning Control Theory and i have a confusion about whether the following PID controllers are interchangeable or similar. Are they equivalent? Why? Is there any difference in how i would ...
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66 views

Is this a PID cascade control loop?

I'm working on a balancing robot. I'm familiar with the simple PID control loop but i can't understand this PID control loop. Is this actually a cascade control loop? The programming states that the ...
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44 views

Interpreting Nyquist plot

When implementing the control for my application I got this Nyquist plot which made me flabbergasted. If I zoom on the point $-1 + 0j$ I get the following image How do I interpret this contour going ...
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53 views

Difference between Hysteresis, low pass filter and deadband in control theory?

I am trying to understand the fundamental difference between the following terms in the context of control systems: Hysteresis Low pass filter Deadband Are these just fancy names that can be ...
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I have a problem with my representation of roll in Simulink

I am currently an engineering student and a member of the aerospace club of my engineering school (ESILV) which is called LéoFly. We’re a team of 12 students and are building a Fusex (...
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1answer
24 views

How to find Performance assessment (IAE and ISE) of a PID Controlled system?

The Integral Absolute value Error (IAE) and the Integral Squared Error (ISE) is to be analysed. A PID Controller is given as follows: ...
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42 views

PI controller for second order system

I have a second order system and I need to control it using a PI controller. I need to select the parameters of the controller in order for the system to satisfy a less than 10% overshoot requirement ...
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1answer
47 views

Stabilization of telescope on gimbal using data from encoders and gyroscope

I'm designing a control system for a balloon-borne telescope experiment. As the balloon is constantly moving and the gondola is rotating, I want to stabilize the telescope which can be controlled in 3 ...
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46 views

How to grind into concrete ( not core drill )

I have a very specific and weird task I need to accomplish. I have a concrete wall that I need to get samples of the concrete dust to grind and get them tested, i plan on using a plunge router with a ...
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Designing a PID Controller for Satellite Control

As an Aerospace Engineering Student, I have been trying to make a project of a PID Controller to control the attitude response of a satellite using the parameters from a project called Kufasat. The ...
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1answer
59 views

Do variables dimensions matter in PID simulation + I want the PID output to be volts?

I have a self balancing robot control loop that uses the PID controller. I feed the robot's angle (rad) to sum block that generates the error between the set point and the angle. The error then goes ...
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If a system is globally asymptotically stable AND locally exponentially stable, can we say claim that it is globally exponentially stable?

I am taking a nonlinear control class. As we were discussing stability, we came across 'weaker' and 'stronger' stability conditions. For example asymptotic stability (AS) is stronger than stability in ...
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27 views

Control systems to control position of antenna with motor?

I want to design a control system with microcontroller to control position or orientation of antenna with BLDC motor with high precision like 0.1 deg and I don't have idea which motor position ...
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Observable Canonical Form - Modern Control

I have derived controllable canonical form (very easily), but I have trouble deriving observable canonical form (supposed to be easy.. at least every textbook is implying so). The picture underneath ...
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35 views

How to use lsim in matlab for a closed loop system

I have designed a system using a minimum realization. I have the A, B, C matrices and I have assigned closed loop poles for the system. I used the place command to find my K matrix. I am wondering ...
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Controls system response to step functions and impulse functions

when a impulse or step function are applied to a system, is the impulse function like being on a physical system and the step response like applying a constant force to something like a mass spring ...
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42 views

Derive a Transfer Function from first principles (PID, system identification, statics)

I want to derive a transfer function of my system so I can plug it into MATLAB and use the PID tuner tool. My system is a balancing beam with a motor on each end of the beam. My first principles ...
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31 views

How to tune PID for a step response

I am very much confused finding the time constant and DC gain for the below step response. The idea is to find PI gains for speed control and I am following this tutorial online Tutorial Link Motor ...
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Significance of asymptotes in root locus

What is the significance of asymptotes in the root locus of a linear time invariant system. Does it say that for that particular pole on which it is starting doesn't have a practical pole in the ...
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1answer
20 views

Criterion to neglect poles of higher order

If I am having a fifth order system, it is said that the dominant two poles nearer to the jw axis determine the nature of the output, is there any criterion to neglect the other three poles , should ...
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Why does a lead-compensator type system decrease to a step response

For example, the step response of $\frac{s+1}{s+2}$ is decreasing although its gain is +1, and this system has higher gain at high frequencies than low frequencies based on its Bode plot. But if I ...
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Output matrix for system with accelerometer

Consider a generic second order state space SISO system \begin{equation} \left[ \begin{array}{c}{\dot{\tilde{x}}_{1}} \\ {\dot{x}_{2}}\end{array}\right]=A \left[ \begin{array}{c}{\tilde{x}_{1}} \\ {\...
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32 views

How can I tune the parameters of a lqr controller?

From my internet research, it seems there's no systematic way of tuning the design parameters for the LQR controller. I have found Bryson’s rule as an initialization. However I don't know how to ...
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62 views

What is the appropriate type of controller for this system?

I am given this transfer function for a system: $T\left(s\right)=\frac{9.81}{s^4+0.5s^3+11.2815s^2+4.905s}$ Now, I want to design a controller that will make the closed loop system have an overshoot ...
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Digital control implementation in MCU

I have implemented a PI compensator for an integrator plant through floating point variables and everything works fine. The design intent is tracking filter and it does not track well the input signal....
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Control law for nadir pointing spacecraft

Hoping someone here can give me some advice. I've been trying to build an orbit and attitude propagator inside MatLAB and have run into some issues with the attitude propagation due to my lack of ...