A control system manages, commands, directs, or regulates the behavior of other devices or systems using control loops. It can range from a single home heating controller using a thermostat controlling a domestic boiler to large industrial control systems which are used for controlling processes or machines.
For continuously modulated control, a feedback controller is used to automatically control a process or operation. The control system compares the value or status of the process variable (PV) being controlled with the desired value or setpoint (SP), and applies the difference as a control signal to bring the process variable output of the plant to the same value as the setpoint.
For sequential and combinational logic, software logic, such as in a programmable logic controller, is used.
Hi,
I seem to be having some issues going from state space representation of a system to signal flow graph representation. My troubles seem to be, if I have something like this
\frac{d}{dt}x_{1}(t) = v_{1}(t)
In state space representation I list functions to which the derivatives are as...
Homework Statement
I'm trying to find \frac{V_{Load}(s)}{I_{Dist}(s)} using Mason's rule. I was able to solve for \frac{V_{Load}}{I_{Cf}(S)} using Mason's rule but am not sure how to solve for \frac{V_{Load}(s)}{I_{Dist}(s)}.
http://imageshack.com/a/img31/4299/zr5.PNG
Homework...
I'm trying to solve this equation analytically, but I can't even find the auxiliary equation or general solution!
Km = 0.5
C*e = 0
K2 = 0.03
K1 = 0.05
x* = 49
Homework Statement
Find the transfer function, G(s) = \frac{V_{0}(s)}{V_{i}(s)} for each network shown in figure P2.3. [Section 2.4]
http://imagizer.imageshack.us/v2/800x600q90/20/1ocq.png
Homework Equations
The Attempt at a Solution
When I try and solve this problem I...
Been reading some Dover books (topology, ODE:s, complex variables) and I think they've been just brilliant so far. I'd like more books in the same vein on other subjects. Most engineering books are absolutely awful in my opinion (books in the style of Merriam/Kraige mechanics - utterly...
I'm having problem with task (a) in this problem
The question
My attempt
The solution
Why don't I get the same after I take the partial fraction using my calculator? And where does this R(s)=1/s^2 come from
I came up with this question while studying for an upcoming exam. I had a design problem, my solution gave me a gain of about 5500 with a PI compensator. Does having that high of a gain screw with my system? It gives me the desired results in MATLAB, but are there any drawbacks to doing that?
Hello folks,
I am having hard time to decide which class to take in my senior year. I have two choices: Embedded Systems with primary focus on FPGA and VHDL and another class is Control Systems design. I like both of them, but the problem is that they are offered almost at the same time, so I...
Heyo,
Finally taking my first senior level course in Mechanical Engineering - Dynamic Systems and Controls. I find it incredibly interesting and was hoping someone could suggest an easy to medium difficulty project I could do on my own. This is for my own edification. The book that my class...
Homework Statement
Given the transfer function:
R(s)=\frac{K}{s(s+2)(s^2+4s+5)}
Find the following (needed to sketch the root locus:
a) Number of branches
b) Symmetry
c) Starting and ending points
d) behavior at infinity (asymptotes)
e) Real axis breakaway and break-in points.
f)...
Homework Statement
Welding robot is defined by the block diagram attached/ excuse the paint work.
(hope that worked)
find:
a)maximum value of K required to achieve stability.
b)roots of the characteristic equation, at half the maximum K value.
c)estimated percentage overshoot, if the...
Why should the input follow the exact output in control systems (Transfer function). What if my system is an amplifier ? shouldn't that means that the output is the input * gain ?
I can't understand the differences between dealing with a real system ( such as an amplifier) of dealing with a...
Homework Statement
Different control systems can be distinguished by categorising them as regulator control systems, positioning (or servo) control systems or tracking control systems.
definition?
components features, diagram?
examples?
describe one industrial application in detail...
Homework Statement
In my notes it is stated that an integrator adds a phase lag of -Pi/2 and thus can cause instability. I want to understand what this really means and am deviating from the notes somewhat so do not know if I am barking up the wrong tree.
Homework Equations
Given a...
Homework Statement
Here is the system I am looking at
Homework Equations
So I worked out a formula for the steady state error and put it in a form similar to masons gain formula
The Attempt at a Solution
But when I try and draw a block diagram and work out e I get...
hello all, i need some help on this one. i want to do an article about the posible aplications of quantum entanglement in aircraft flight control systems. i want to entangle two transistors, put one of them at the ACE - actuator control electronics (probably) in the pilot's cabin and the other...
Homework Statement
I am given the transfer function
Gp (s) = 1/(s+16)
and I have to design a controller of the form
Gc (s) = K(1 + 1/T*s)
(which is a PID controller)
To meet the following requirements:
Maximum steady state error to a steadily changing desired position = 5%
Maximum...
I have narrowed down a control systems question I am doing to the following function in the S-domain.. numerator = (5s+1) denominator = (s+3)(3s+2)(s^2)
Using partial fraction expansion - I compute A = 14/63... D = 1/6... B = -2.25 And I can go no further - because both MATLAB and MAPLE...
Homework Statement
Consider the electrical circuit shown:
http://imageshack.us/a/img525/8163/p1circuit.png
Let the state variables be x1(t)=Vc(t), x2(t)=iL(t), and x3(t)=Vc(t); output is Vo(t). Write the state-space equations in matrix form and find the transfer function, T(s)=Vo(s)/Vi(s)...
I have a given system and I need to
A) determine the transfer function
B) find the values of K form Routh-Hurwitz
C) Determine the values of K for the stable region
D) Create the simulink model.
I want to know how to write my MATLAB code so that I can solve what I need to. I DO NOT want...
I am fairly new with simulink and only went through a couple of tutorials on how to use it. but i am looking to do some control system design with a 3D model.
I know i have lots to learn so i would like to get some directions as to where i should go to reach my goal.
I am looking to...
"engine and control systems" vs "powertrain"
I am interested in working for a person in charge of "powertrains" on cars, and I have an interview for a co-op opportunity to work with someone in charge of aviation "engine and control systems"
how much would these things overlap?
i guess both...
Hi there, we recently completed a laboratory session on MATLAB relating to an RLC Circuit and arrive at a code and relevant inputs and got our graphs as shown below.
I was just wondering if anyone know if these are correct and make any sense? Or any other comments appreciated.
We also have...
Hey everyone,
I am an undergraduate mechanical engineering major considering a EE feedback controls course as an upper division elective. I have taken ME Control Systems and am also the Lab Instructor for it this semester. I am familiar with signals, filters, sensors, controllers etc.
My...
Homework Statement
The system is given by:
G(s) = 1/((s+0.1)(s+3))
I need to convert it to G(z), it's discrete form.
The sample time T is 0.1 seconds.
Homework Equations
To convert it they give
G(z) = (1-z^(-1))*Z-transform[G(s)/s]
The Attempt at a Solution
Obviously I...
Hi guys,
Need a little help with an example my tutor and I are trying to work through.
We're converting a dynamics system from a state space representation to a transfer function.
This is where we are at so far...
[s^2 + (C/Mb)S + (K1/Mb), -((C)S + K1)/Mb; -((C)S + K1)/Mw, S^2 +...
So I have a control systems mid-semester exam coming up and the lecturer has posted up a formula sheet for us. However it is different to past years exams and has a geometry section with the following equations:
e^(±jθ)=cos(θ)±jsin(θ)
cos(θ)=(e^jθ+e^-jθ)/2
sin(θ)=(e^jθ-e^-jθ)/2j
Now I've...
Help! I'm a third-year chick in engineering, stuck on a block diagram reduction problem for my control systems engineering course.
Please email me and I'll send you a screenshot of the problem!
kati@sidwall.com
Thanks a mill.
K
xo
Homework Statement
A unity feedback system of the form:
X(s)-------->Gc(s)---------->G(s)------------>Y(s)
| |
| |
----<------------1---------<----
has a plant:
G(s) =...
Homework Statement
Consider the continuous time state space model governed by:
A = [-1 0;1 0]
B = [1; 0]
C = [1 -1]
D = 0
a) suppose we are using the following state feedback and observer gains
K = [k1 k2]
L = [l1;l2]
find the loop gain symbolically using MATLAB (aka find...
Homework Statement
Show that the geometric multiplicity (denoted by Qi) associated with an eigenvalue(lamda i)
of an nxn matrix A can also be expressed as Qi=n-rank(A-(Idendity Matrix)*(lamda i)).
P.S.:: Lamda i is simply a scaler quantity since it is an eigenvalue where A and...
I am a MaSc student in electrical engineering. In my undergraduate degree I focused on controls and now want to do a thesis on implementing controls other than PID in reactors. I am looking for a good source of information on controls systems in nuclear plants and the modelling and simulation of...
Given an observable realization (A,b,c). Determine in terms of the matrices A,b, and c the similarity transfrom T, that brings the this system to the observability canonical form. Can this be done if (A,b,c) is not observable too?
I don't know where to start. I am thinking pick...
Here is a doozy
In a magnetic levatation experiment a metallic object is help up in the air suspended under an electromagnet. The vertical displacement of the object can be described by the following nonlinear differential equation.
m(d^2H/dt^2)=mg-k(I^2/H^2)
m=mass of object
g=gravity...
I am trying to find out what methods and tools are commonly-used for modeling and flow-balancing ECS on passenger aircraft…
Any thoughts would be appreciated. Thanks!
Homework Statement
Find analytical expressions for the magnitude and phase of the frequency response for each G(s) below:
(a) G(s)\,=\,\frac{20}{s\,\left(s\,+\,5\right)\left(s\,+\,5\right)}(b) G(s)\,=\,\frac{2\,\left(s\,+\,5\right)}{\left(s\,+\,1\right)\,\left(s\,+\,10\right)}(c)...
Homework Statement
http://img24.imageshack.us/img24/9028/72841137.jpg
Homework Equations
Routh-Hurwitz Stability Criterion
The Attempt at a Solution
For first question, you just write the Routh Array, make sure that the first row is all positive and you get Kmax = 1. Simple enough
How...
ELEG -- DC Motor Control Systems Problem
Homework Statement
The voltage equation of a dc motor is written:
ea(t)= Ra*ia(t) + La*[dia(t)/dt] + Kb*wm(t)
where ea(t) is the applied voltage; ia(t) is the armature current; Ra is the armature resistance; La is the armature inductance; Kb is...
Homework Statement
I have a transfer function in the laplace domain, and I have been asked to:
"Develop Relationships in terms of the constant parameters and adjust K such that the constants are: A = 2, B = 1, C = 3, a = 3, b = 1"
After finding this relationship, I am asked to convert it back...
Hello, first time poster (can't say I am a long time reader) and I've been looking for the answer to a question in regards to Aerospace Engineering. First a bit of background about my degree.
I graduated with a bachelor's degree in Engineering Physics with a focus on electrical engineering. I...
Hello,
Let me clarify my questions.
Short version:
When applying to graduate school, does the admission committee often look at which electives you have taken in your major? Do they dislike applicants who take electives that don't seem focus on one specific specialty in that major?
Longer...
Hi
I couldn't find any specific reading material for T and PI network based compensation in control systems. I was hoping someone could point me in the right direction. If you happen to know something about this, please do reply to this thread.
Thanks in advance.
Hi
For a control systems project this semester, my friends and I are working on a closed feedback image focusing system. Using a webcam, an image of a black and white checkerboard is acquired by a computer program. Then, the amount of defocus (blur) in the image is measured and quantified in...
Hi
For our control systems project, we are trying to implement a closed feedback image focusing system. A digital camera captures the image of an object (a checkerboard), sends it to a computer algorithm which determines the amount of defocus in it and sends an actuation signal to a stepper...
Hi guys,
i am taking a module on feedback control systems this semester and i was wondering if anyone has any good recommendations of textbooks. Thanks guys.
Marcus.
Control and protection electrical circuits are one of the important portions of electrical systems designed and shown by standard symbols.
Usually the circuit is supplied by positive and negative polarity of one battery. In almost electrical circuit diagram sheets we can see a positive line of...
Hi, I am currently choosing my specialisation modules. May i know what are the most important aspects that an electrical engineer should know with regards to "control systems"? Tks :smile: