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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25 views

Control theory: What is the relationship between the number of elements in your system, and your diff'eq IO model and the dimension ABCD Matrix?

From my understanding, the order of your system is directly proportional to the number of elements in your system. Suppose I have a circuit containing 6 capitors/inductors Then the order of my ...
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0answers
31 views

implemented feedback loop to count pulses but loop doesn't work

I am implementing feedback loop which count number of pulses from optical encoder and convert it to rpm(speed). But i noticed that number of pulse count remains same irrrespect of the motor speed. I ...
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2answers
39 views

Why is any lumped parameter system modelled with an ODE?

I'm studying Control Theory and the book jumps from a input-output representation of the system to a ODE model. Initially, the book derives that any causal system can be represented as: \$y(t) = ...
0
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1answer
75 views

Optical encoder in Proteus

I am working on dc motor speed control project in proteus and for the feedback i am using optical encoder.Dc motor speed is calculated by counting pulses from encoder. But i wanted to know what is ...
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2answers
48 views

Identifying position transfer function for a DC motor

I am trying to identify a simple position/speed system based on the inputs and outputs using a DC motor equipped with a qudrature encoder.For the soft i am using xcorr and arduino blocks to apply a ...
0
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0answers
52 views

Can someone give me a definition of “agent” as used in engineering?

I went to a presentation today and part of it is about multi-agent system. I thought that the speaker would introduce the term but regrettably he did not. Can someone provide a definition of agent as ...
0
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1answer
42 views

Since the z-transform of the zero order hold is 1, why bother including it in analysis or simulation?

The z-transform of the zero order hold is 1. So why should it even be considered in the discrete time analysis or simulation of discrete time control systems? ...
1
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1answer
78 views

Using a Contactor or Relay to switch between two DC power sources?

I want to power a motor with a battery, however the complication arises as I want to have two power sources and be able to switch between them. The context of this problem is for an electric vehicle. ...
2
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3answers
88 views

What is the effect of aliasing in discrete time controller?

Suppose we have a controller whose TF is $$ G(s) = \frac{1}{(s^2+1)} $$ This yields two marginally stable poles at \$ s = \pm j \$ Now let's discretize the controller through z transform, after ...
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2answers
127 views

How to switch between two DC power sources powering a motor on an electric vehicle?

Background: For a university final project, my student group is investigating the possiblility of powering a motorcycle with two seperate batteries, each of a different chemistry (Lead-acid and ...
4
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3answers
119 views

Transfer functions with constant voltage sources in them?

I am trying to get the transfer function: $$H(s)=\frac{V_o}{I_i}$$ For the following circuit: simulate this circuit – Schematic created using CircuitLab I think I can get it without ...
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2answers
126 views

Make hard drive stepper motor run 7200 rpm

I have an old hard drive (7200 rpm) motor like this: I'm trying to make it run as fast as possible and I start with this code (arduino uno): ...
6
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3answers
188 views

How to design controllers “properly”?

It may sound like the "easy way" to ask it here, but this question (along with a couple others I've posted which were more specific) is the result of years of research on the topic - on and off as ...
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votes
1answer
67 views

When do we prefer Laplace signal form instead of time signal form - Control Engineering [closed]

I am struggling to see when you will prefer laplace transform X(s) instead of a time domain signal x(t). What does Laplace transform tell you? What is the benefits to use Laplace transform? What ...
1
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3answers
109 views

Implementing differentiation and integration in a digital control system?

In a computer control system (microcontroller-based), the sampling time of the inputs to the system determine whether to treat the system as a discrete system or continuous. From what I have learnt, ...
-2
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1answer
65 views

Lead-lag process control

What is the locus of the following system, and for what value of \$\alpha\$ is the damping ratio 0.5?
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1answer
90 views

Why can I ignore the “imaginary” value from the gain of my system?

I’m in the final year of my education, and for the exam training I had to find the K (or max gain) value of the given system when the desired damping ration equals 0,7. What i have done to addres the ...
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2answers
45 views

finding a system behaviour [duplicate]

Why is step response so important? for finding properties of a system we use step response of a system why we don't use other basic signals such as impulse or ramp? thanks for your responses.
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3answers
45 views

Does this article's appendix contain an error (is the heating system described integral control)?

I am confused by the primer on control theory found at the end of the following paper, which concerns an instance of integral control in a biological system. Since it concerns integral control, I ...
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2answers
74 views

regulator ac to dc with

I am studying for my EE exam ,I understand the general working of the circuit but there is some details about it I have to know. this regulator supply 24 volt with puissance nominale 200watt. it ...
2
votes
1answer
69 views

Effect of zeroes in system stability

Suppose we have two third order systems (a and b), with three poles and two zeroes,poles for both the systems are at the same positions in frequency domain but these systems differ in the placement of ...
1
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1answer
108 views

How to represent circuit in state space

I have this circuit and I must represent it in state space. I know the process because I have done similar ones but having trouble with this one. I have found the Kirchhoff equations for the 2 loops ...
1
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1answer
74 views

What is the difference between disturbance and noise for dynamic systems?

In most references from dynamic system theory, the following linear continuous dynamic system is considered. $$\frac{\text{d}x(t)}{\text{d}t}=Ax(t)+Bu(t)+Dd_{1}(t)\quad (1)$$ $$y(t)=Cx(t)+Ed_{2}(t) ...
1
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1answer
82 views

How to determine the transfer function of a system including disturbances

I'm trying to determine the open-loop transfer function of the system below (in order to determine PID gains). If I account for the disturbance \$(9.81*6700)\$ in the system and use equation 2, I ...
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0answers
31 views

control circuit of humanoid robot: is it worth to learn and use ROS

i am building the upper body of a humanoid robot for my MSc thesis project with 24 dc motors and multiple sensors(something like i-cub or Nao) i have basic knowledge of communication protocols and ...
1
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2answers
56 views

What is the correct transfer function of a feedback loop if the summing amplifier has different input resistors?

Suppose I have a circuit below: simulate this circuit – Schematic created using CircuitLab I know the the transfer function of a negative feedback loop is: ...
0
votes
1answer
188 views

Using a transistor as a heater

I have the task to build and control 35 heaters, 10 W each. I first thought about using power resistors (like in this datasheet) as heating devices, but they'd need high currents in order to get the ...
1
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1answer
135 views

How to find the state-variable equations from the signal flow graph of the system?

How to find the state-variable equations, i.e, the state equation & the output equation for the system described by the signal flow graph below?
2
votes
1answer
54 views

General form of a Transfer Function

A professor is writing the general form of a Transfer Function as: $$k\cdot s^{l}\cdot \frac{\prod\limits_{i=1}^{m}(1+\frac{s}{z_{i}})}{\prod\limits_{i=1}^{n}(1+\frac{s}{p_{i}})}$$ but in every book ...
0
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1answer
55 views

Powering circuit with alternative and/or concurrent power sources

I have one of these led projectors which is normally powered by the embedded motion sensor. I want to be able to power it manually by a switch button. I need to do this in both alternative and ...
0
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0answers
38 views

How to implement a multiple controller system?

I want to make a system that switches between multiple controllers depending on a parameter 'x' in the system. Eg. If there is no noise use a pid controller. If there is noise use a resonant ...
0
votes
1answer
81 views

Desired response of PI controller in motor vector controller

In vector control (field-oriented control) of motors (specifically induction motors), a rotating reference frame is attached to the rotor flux to give "DC" values in the current controller. This ...
0
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0answers
126 views

Finding transfer function of this signal flow graph using Mason's Rule

In the following signal flow graph, how do you find the transfer function Vload(s)/Idist(s) using Mason's rule? The solutions manual says it would be the same transfer function as if you were finding ...
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4answers
182 views

Why is the frequency complex

When we take the Laplace transform of a function, why is the frequency (s) complex? I can not understand the significance of complex frequency. Please help or give some references.
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1answer
182 views

Need suggestions on control system engineering [closed]

I am sophomore studying control systems and the problems given in the books( like Norman Nise ) look too easy. Please suggest some good book with really good problems.
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2answers
81 views

How do I hold a signal high from one high pulse?

Assuming I send a signal wirelessly to a receiver connected to a fan. if the receiver detects that a pulse is there, it switches on the fan. the fan should stay on until it detects another high pulse, ...
0
votes
2answers
873 views

How to calculate Kp, Kd and Ki?

The motor operates within 140 rev/min to 600 rev/min. The controller gives an output in the range 4 to 20 mA. The sensor output reading equivalent to 400 rev/min, actual reading was 404 rev/min. The ...
0
votes
1answer
100 views

Relationship between switching frequency and controller's crossover frequency in buck SMPS

Context: tuning the control loop of a buck SMPS. I specicifally have a TI TPS40200-based circuit in mind, but I think this applies to SMPS design in general. Quoting from Type 2 compensation network: ...
0
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2answers
737 views

Cascading PID DC Motor Position & Velocity Controllers

I'm trying to build a robot with a differential drive powered by two DC motors. First I implemented a PID Controller to control the velocity of each motor independently. Estimated the TF using the ...
1
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1answer
422 views

SMPS : Average Current Control Vs Peak Current Control

Please correct my understanding. I understand that in peak current control mode, the slow outer voltage control loop generates a current command to the faster inner current loop. This current command ...
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votes
2answers
67 views

Model and Control of a Physical System [closed]

Suppose i have a physical system (set of interacting elements ) that i want to control. Best thing we can do to understand this physical system and hence control it, is to model it. We ...
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5answers
189 views

Kinds of Feedback

"Feedback is a process in which information about the past or the present influences the same phenomenon in the present or future" I find the idea of feedback quite fascinating and i could ...
2
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2answers
303 views

Time domain and Frequency domain

what is the difference between time domain and frequency domain components? How do these domains differ from each other?
6
votes
6answers
529 views

Control theory basics

I'm trying to understand something very basic about Control Theory. Let's say I have the following loop: If we'll relate this loop to a cart with a motor going in its single axis from X = 0 to X = ...
2
votes
1answer
71 views

When the Gain Margin is negative, for what range of frequencies is will the output resonate out of control?

If your system/transfer function has greater than zero gain for the frequency associated with -180 degrees phase, the system is said to be unstable. What does this mean for other input frequencies? ...
4
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1answer
172 views

Practical Limit of Feedback Control Systems WRT Bandwidth

In a digital feedback control system, I'm interested in the practical limit of what the correctable bandwidth is. For example, given a very simple system: A sensor can sample a simple X position ...
-1
votes
1answer
115 views

Digital Control Engineering book recommendations [closed]

What are good books on digital control engineering specifically? I'm a third year electrical/computer engineering student who will be doing a course on digital control next semester, but would like to ...
0
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3answers
126 views

Step response to feedback loop with disturbance

When using step response to a feedback loop with disturbance. Why do we analyze the step response of the disturbance D and the step response of the input R separately. Instead of considering them ...
0
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0answers
57 views

Nyquist VS Nichols plot

Which is the most commonly used: Nyquist or Nichols plot? Do they have their own particular use or is it just a matter of preference?
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0answers
40 views

Detect unathorized access in RFID security system

I have a question about RFID security system and tags when implemented in traffic monitoring system. The scenario is a 1) Reader and a 2) barricade which is some 2 meters ahead of reader. Now how do ...