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 ...

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Connecting Motor wiring [migrated]

I'm trying to connect Live Wires (L/N/G) to this electric blind receiver and can't figure out the way to do it. Motor Has 4 Wires Blue = Neutral Black = Direction 1 (I assume UP or Down) Brown = ...
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1answer
24 views

Getting the Wrong Transfer Function for Controls Problem

Background So admittedly, it's been about 5 years since I've dealt with any kind of circuits and now I am going back and taking a controls course. On the very first problem I am doing, my answer is ...
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1answer
35 views

Applying 1st order filter [closed]

I have a 1st order continuous filter T * y'(t) + y(t) = u(t) . I discretized the equation by hand and applied filter and I used ...
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0answers
32 views

How to determine the transfer function for 2nd order, over-damped system

My question is related to this one asked previously. The chosen answer says to find the poles "a" & "b" for a 2nd order, overdamped system one would first set the derivative of the impulse ...
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1answer
50 views

Discretization Using ZOH, FOH and Tustis bilinear Transformation

I am very new to this forum, so excuse me if i do not write the equations properly. And I'm pretty new to DSP too, so this might be very basics for most of you, but it's pretty complicated to me. I ...
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4answers
30 views

Choosing accelerometer or displacement sensor for system

I am working on an electro-servo motor system which can be seen as a similar in here! It is a shaketable system which converts acceleration input to displacement output. My question involves a bit ...
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0answers
32 views

A quick question about system identification

I am trying to identify a temperature controller system. I have chosen my inputs to be a PRBS signal for the actuator and I am reading in the output from my thermistor. I am using atmega328 to read in ...
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3answers
59 views

interchangeable operation of two electric motors without PLC

I have two motors that drive an air compressor. I have a pressure switch to turn the motors on/off. The sequence I want is: when pressure switch turns ON - motor 1 starts, when pressure switch ...
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1answer
41 views

if i have a pole in (0,0i), is the system stable for k=0?

KGH(s)=k/s(s^2+4s+7) Is my system stable for k=0 ? If i have a pole in 0,0i does it automatic says that my system is not stable
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0answers
40 views

What is the natural frequency of a 3rd order system with 3 real roots?

I know the the structure of a 3rd order system is: \$Q_s=(s+a)(s^2+2\xi\omega ns+\omega n^2)\$ but what do I do if I have something like this? \$Q_s=(s+4)(s+5)(s+3)\$ How do I measure its natural ...
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2answers
56 views

How to get maximum damping factor from this system?

I have a system with a transfer function as $$ \frac{(s+3)(s+10)}{s(s^2+4s+5)(s+10)+K_Ts(s+10)(s+3)+600(s+3)} $$ Which has the characteristic equation: $$ ...
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1answer
44 views

What would be the Transfer Function of this Block Diagram?

I have a block diagram that I am trying to get the transfer function for but can't seem to figure it out, I am sure that I am making it more difficult than it needs to be but still can't get it. The ...
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2answers
46 views

Drawing Bode Plot from transfer function

I have the following question I need to Draw the Bode Plot,so i need to find Magnitude and Phase Angles for a Frquency.I understand that i need to susbstitude ...
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1answer
29 views

Steady State Error of Control System

I have a question regarding a control loop system which is subject to disturbance, unfortunately I missed a couple of lectures on the subject and now am scratching my head as to how to do it. The loop ...
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1answer
37 views

How to account for missed steps?

Stepper motors have a non-cumulative step error of ±5%, at least all the ones I've seen. How can a missed step be detected reliably?
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2answers
33 views

How to infer equivalent PID controller coefficients from an existing black box ccontroller?

I have a 2 input, 2 output system that I have recorded in response to 1. steps (actually quasi-steps, with 50 ms rise time + some overshoot), and 2. sine waves from 0.5 to 50 Hz, in both open and ...
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1answer
25 views

How do i go about finding the transfer function for this control system?

How do i go about finding the transfer function for this control system?
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0answers
37 views

conversion of kp,ki values

I have tuned a pi controller with kp, ki values in integer form using matlab simulink tool.To implement the pi on dsPIC33f it a requires fractional pi controller.How to convert conventional pi values ...
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2answers
40 views

help with multivariable control loop

I am looking to find the transfer function from w to z in this loop. I have been trying for a while looking all the relationships but just don't know how to express w in terms of r,d and n and then ...
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0answers
31 views

Designing a system to move a marble on a rotating beam from point A to point B using a servo

I need to figure out how to design a system to move a marble on rest at point A to point B at rest. See my drawing below for what I'm trying to accomplish: I have an Arduino I could use as a ...
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1answer
30 views

Is it possible to set initial state to a simulink model to do simulations?

Consider that I have built an electrical circuit, or a power system or any other at Simulink and to do simulations, Simulink should work in the sense that it builds a state space model of the system, ...
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0answers
36 views

Discrete disturbance observer

I am an autodidact in digital control and I have been solving following problem. I would like to construct a digital state observer combined with disturbance observer and I am not able to find ...
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1answer
31 views

How to implement a MIMO model with state space block in sumulink?

I want to implement an state space model with 4 inputs and 4 outputs at simulink. But the state space block has only one input and only one output. So what can I do here?
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1answer
33 views

k transfer function

If I'm giving a transfer function $$T(s) = \frac{G(s)}{1+G(s)H(s)}$$ When calculating the critical gain using the routh hurwitz method and calculating a negative value for k. What does that tell ...
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2answers
39 views

Root Loci Breakaway points

my question is regarding if the breakaway points exist or not. Do they only exist if 2 poles or 2 zeros are next to each other? Example if their are poles at -1 and -2 the breakaway point would be at ...
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1answer
50 views

Control Systems Stability

So I asked this question previously in the control theory section and got no responses. Ill try it here. Basically I need to find the ranges of k and \$\beta\$ such that the steady state error will be ...
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2answers
77 views

Switching on and off a LED light if a AC is passing through a wire or not

This is the basic setup of what I'm going to do. Have a wire plugged into the mains that is then connected to a ON/OFF flip switch then goes on to the rest of my project. Want I want to do is to add ...
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0answers
70 views

How to make a sound-controlled variable resistance?

So I have those old analog video equipements (Panasonic WJ-AVE5, Videonics Video Equalizer) and I'd like to have some of the parameters (video crossfade, superimpose function, brightness level, etc.) ...
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1answer
41 views

Heat exchanger identification

I have been developing a digital controller for water cooling system of power electronics converter. This system consists of plate heat exchanger, pipe with demineralized water flow (this fluid is ...
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1answer
32 views

Closed Loop 4 Sensor Control System

I have 4 on/off motors running individually (call them M1, M2, M3, M4) and 4 ping sensors (call them X1, X2, X3, X4) with a board placed in front of the motors and sensors. As the motors move forward ...
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1answer
40 views

proportional control offset

I understand that with proportional only control you have to have error or the control output goes to zero. The answer to this question Proportional controller was very informative. Mr. Lathrop ...
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2answers
58 views

How an equation in s domain is converted into z domian using zero hold method

I am just reading a research paper on matrix converter and i came through transfer function conversion from s domain into z domain. which i am unable to understand. how the equation 3.4 is transferred ...
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2answers
66 views

Is feedforward used in boost converter operating in DCM mode?

Is feedforward used in boost converter operating in DCM mode? I saw some examples where feedforward is used to control boost converter in CCM but not DCM mode. So I am wondering if it can be used in ...
3
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5answers
679 views

Could you explain how feedforward is used in walking?

I am reading about feedforward in control system. And in this lecture, slide 49, the author says that feedforward is common in human systems. Example, walking, playing basketball, driving a car. ...
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1answer
22 views

Qualitatively assessing time domain characteristics from bode plot

Given a bode diagram of loop transmission function, I have heard that it's possible to qualitatively assess the behavior of the system in time domain. These characteristics include delay time, ...
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1answer
60 views

A question about using PID to improve transient response for a DC motor

I have used PID a couple of times, but there is one thing I haven't been able to understand from any literature/textbooks. If I run a DC motor from a 12v battery for example, how can PID improve the ...
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0answers
35 views

Digital state space compensator based on current state observer

I have been solving following problem. I have a continuous system with following state space equations $$\left[\begin{matrix} \dot{x}_1 \\ \dot{x}_2 \end{matrix}\right] = \left[\begin{matrix}0 & 1 ...
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0answers
24 views

Feedback in Sampled Data System

I am new to digital control. I have a feedback loop as shown in figure. I tried solving for the closed loop transfer function but after following rules given in the books on Digital Control, I was ...
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1answer
57 views

Simulink Modeling Problem

I posted a question recently regarding PID controllers, and it was swiftly answered. I began to work up a Simulink model and I'm running into problems with my (simplistic) model. I want to work out ...
6
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4answers
500 views

Misconceptions about PID Controllers

I'm currently designing an equivalent of the mass-spring-dashpot system, and during the design phase I realized I don't fully understand how PID controllers physically work. Below is an image, the ...
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1answer
48 views

Transfer function of controller

I am solving this question given in book (Automatic control system). As asked in (a) part \$G_c(s)\$ of the controller. I solved it and getting answer$$G_c(s) = ...
2
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1answer
97 views

Unexpected LTSPICE Output - Voltage Mode Buck Convertor

I'm trying to simulate in LTSPICE a simple buck convertor taking 34V -> 20V @ 2.5A and I'm not seeing what I expect. Here is my circuit and some waveforms: The top half of the circuit is the ...
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2answers
83 views

Practical Implementation of Smith predictor

I am now dealing with Smith predictor and I understand that it's based on model of the controlled plant. This model I can get by some identification method, but such a model will never be absolutely ...
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1answer
49 views

what type of modification can i use in my MCU in conjunction with my SSC32? [closed]

Hello there guys im looking for a way to connect and use a DC motor with a Servo controller such as the SSC32? now given the fact that a Servo controller or driver has 3 pins, PWR GND SIG/PULSE now ...
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1answer
95 views

Lead Compensator for double integrator

I am an autodidact in control engineering and I have been trying to design a lead compensator for double integrator system so that the closed loop poles have damping $$\zeta=0.5$$ and natural ...
0
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1answer
79 views

Input/output for buck-boost converter controller implemented with FPGA

I am trying to implement a voltage controller for a buck-boost converter using FPGA. The control method I'm trying to use is in this paper: www.engr.iupui.edu/~aizadian/index_files/Papers/C-28.pdf ...
3
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2answers
183 views

How to determine sinusoidal steady state response from bode plot

I'm given a problem by the following: Find the sinusoidal steady state response (in the time domain) of the following systems modeled by transfer function, P(s), to the input u(t). Use the Bode plot ...
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1answer
32 views

Feedback Control: Unexpected result for block diagram simplifications using matlab

I made some simple calculations regarding block diagram algebra. The problem is that I don't get the same result using matlab. Here is the system with it's corresponding blocks: $$H_1 = z+2$$ $$H_2 ...
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1answer
71 views

designing PID controller using Ziegler Nichols algorithm

I'm trying to use Ziegler Nichols algorithm to design PID controller for the following transfer function: G=w^2/(2*xws+w^2), w=1 , x=0.2. so since the step response for this function is a second ...
2
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2answers
58 views

Root locus of discrete time system

I have a question about a probably easy task, but I can't find the right K. I have the loop with an adjustable gain element given: $$Q(z) = \frac{H(z)}{1+ K\cdot G(z)H(z)} $$ I have given: $$H(z) ...