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 ...
0
votes
0answers
4 views
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 = ...
0
votes
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 ...
-1
votes
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
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 ...
-1
votes
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 ...
-1
votes
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
2
votes
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 ...
0
votes
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:
$$
...
0
votes
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 ...
0
votes
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 ...
1
vote
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 ...
-2
votes
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?
2
votes
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 ...
0
votes
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?
0
votes
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 ...
1
vote
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 ...
0
votes
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 ...
1
vote
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, ...
0
votes
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 ...
0
votes
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?
0
votes
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 ...
0
votes
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 ...
1
vote
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 ...
0
votes
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 ...
0
votes
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.) ...
1
vote
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 ...
1
vote
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 ...
0
votes
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 ...
0
votes
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 ...
1
vote
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
votes
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.
...
0
votes
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, ...
1
vote
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
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
votes
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 ...
1
vote
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$$G_c(s) = ...
2
votes
1answer
96 views
Unexpected LTSPICE Output - Voltage Mode Buck Convertor
I'm trying to simulate in LTSPICE a simple buck convertor taking 34V -> 20V @ 2.5A and I'm not seeing what I expect. Here is my circuit and some waveforms:
The top half of the circuit is the ...
0
votes
2answers
83 views
Practical Implementation of Smith predictor
I am now dealing with Smith predictor and I understand that it's based on model of the controlled plant. This model I can get by some identification method, but such a model will never be absolutely ...
-3
votes
1answer
49 views
what type of modification can i use in my MCU in conjunction with my SSC32? [closed]
Hello there guys im looking for a way to connect and use a DC motor with a Servo controller such as the SSC32?
now given the fact that a Servo controller or driver has 3 pins, PWR GND SIG/PULSE
now ...
0
votes
1answer
95 views
Lead Compensator for double integrator
I am an autodidact in control engineering and I have been trying to design a lead compensator for double integrator system so that the closed loop poles have damping $$\zeta=0.5$$ and natural ...
0
votes
1answer
79 views
Input/output for buck-boost converter controller implemented with FPGA
I am trying to implement a voltage controller for a buck-boost converter using FPGA. The control method I'm trying to use is in this paper:
www.engr.iupui.edu/~aizadian/index_files/Papers/C-28.pdf
...
3
votes
2answers
183 views
How to determine sinusoidal steady state response from bode plot
I'm given a problem by the following:
Find the sinusoidal steady state response (in the time domain) of the following systems modeled by transfer function, P(s), to the input u(t). Use the Bode plot ...
0
votes
1answer
32 views
Feedback Control: Unexpected result for block diagram simplifications using matlab
I made some simple calculations regarding block diagram algebra. The problem is that I don't get the same result using matlab.
Here is the system with it's corresponding blocks:
$$H_1 = z+2$$ $$H_2 ...
0
votes
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
votes
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) ...
