Feedback occurs when outputs of a system are routed back as inputs as part of a chain of cause-and-effect that forms a circuit or loop. The system can then be said to feed back into itself. The notion of cause-and-effect has to be handled carefully when applied to feedback systems:
Simple causal reasoning about a feedback system is difficult because the first system influences the second and second system influences the first, leading to a circular argument. This makes reasoning based upon cause and effect tricky, and it is necessary to analyze the system as a whole.
Homework Statement
Determine the system type for
$$
G(s) = \frac{K}{(s + 1)(10s + 1)(20s + 1)}
$$Homework Equations
I am using a step, ramp, and parabolic inputs. That is,
\begin{align}
R(s) &= \frac{R}{s}\\
R(s) &= \frac{R}{s^2}\\
R(s) &= \frac{R}{s^3}
\end{align}
The Attempt at a Solution...
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Homework Statement
Hello everybody I was hoping some of you could give me some some examples of some closed feedback loop mechanical systems.
This is for my controls class where we have to design our own control system. I'm having trouble trying figure out some systems. I know one would...
FYI, I'm not very knowledgeable in this topic however I have noticed something intriguing whenever dealing with sound levels and feedback. My question is.. Why is it that if I were to say turn my headphones to 100% volume and my PC volume is 50% the sound will sound a little "distorted or fuzzy"...
I'm going to try to paint a picture that will allow you to get some sense of where I'm coming from. Forgive me if this post is not as clear as it could be.
My goal in life is to work in the natural sciences. There's not much I care for besides nature. In the end, whatever I do, I have to feel...
Hi,
I have given a complex feedback system in z domain like:
Y = 2*W2 + E
W2 = z^-1/(1-z^-1) * (W1 + (1-z^-1)*W2 - 1/2*(1-z^-1)*Y)
W1 = V - Y + z^-1/(1-z^-1) * 1/2 * (V - Y)
where Y is the system output, V is the system input, W1 and W2 are intermediate nodes and E is an error input...
The radical Smolin thread left me wondering if other similar ideas could not be applied to other areas of Cosmology and even Particle Physics.
Every complex system I can think of in our lives, and in nature, forms part of a complex multifaceted control system or process, with various feedback...
23. Feedback loops
a) As carbon dioxide levels increase in the atmosphere more outgoing infrared energy is absorbed which increases air temperatures and therefore ocean temperatures. As ocean temperatures increase carbon dioxide is released to the atmosphere because less carbon dioxide can be...
Hi All,
Suppose I have the following system:
A = 1 / (S + 1) (open loop)
B = S / (2S + 1) (feedback path)
I know that the positive feedback closed loop system will thus be: A / (1 - AB), and entering this manually in MATLAB (as well as doing it by hand), I get:
2 s^2 + 3 s...
Homework Statement
Find Vo/Vin.I understand perfectly how to do this question. It simply involves an application of ohm's law to find i1, then KVL around the first loop. KCL at the top, and KVL around the second loop. Then to solve simultaneously.
My issue however Is why the mechanics of...
I am really a programmer, so my writing skills are limited.
However, friends encouraged me, and I wrote http://tpsme1.blogspot.com, but can't seem to get any feedback.
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A humble newbie
Jan Atle Ramsli
If one has a simple variable coefficient process like y'(t) = r(t)*y(t), is there a way to control it to a set point by feedback hitting the variable coefficients in r(t)?
I am interested in feedback control of population processes. y'(t) = r*y(t) is simple proportional growth with a...
Hello guys,
this is my first post on this forum. I want to learn advanced/pure mathematics basically just because I find it really interesting and challenging and I have started to learn about proofs. I'm currently reading Velleman's book and I have reached the part in which you actually...
Homework Statement
I have to find the feedback polarity. I proceeded as follows :
Homework Equations
The Attempt at a Solution
1. As Iin = iF , increasing Iin will increase iF
2. Now drain current for MF is increasing so Vgs of the transistor should increase
3. That means...
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I'm trying to get the transfer function of this rigid control system that uses rate feedback to stabilize it. Using k=1 and kv=0
Attempt at a solution.
When kv=0, the rate feedback is removed.
In the block diagram, I moved the pickoff point and used the cascade rule to get 1/s^2
and...
What happens if you combine both negative and positive feedback in one opAmp?
assuming you only have unity gain in the negative configuration and no capacitors? I reckon
adding capacitors would add some oscillatory behavior but would that be the case if both configurations are made only of...
Hi PF members!
I've recently been working on an image (see attached thumbnail) in which I try to include the most important/influential steps in the history of science. Now, I am very well aware that this is not easy (!) :smile:, and it will always be debatable and not without controversy...
OpAmp "Non-standard" Feedback
Hello,
This is my first post here. Please excuse my poor English and grammar. I will try to make my questions clear.
As I understand, with a negative feedback, where the output connected to the inverting input and in the ideal case, the Vn and Vp will be...
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Homework Statement
Homework Equations
I have two "golden rules" I was given which are "no current into the op-amp" and V_{-} = V_{+}
and the open loop gain is infinite
Basically my notes and textbooks are leaving me with pretty much nothing though
The Attempt at a Solution
tried...
Hello,
although i was planning to spend a semester in Sweeden or England i changed my mind and
i submitted all the necessary documents and 99.9% i will be a student at Uni. of West Bohemia (Czech Rebublic) for spring semester.I don't speak their language, i know that we will communicate in...
Homework Statement
What is the exact definition of negative feedback? the instructor told us that negative exists if the output is connected back to the inverting input through a passive element. But what exactly is precise the definition ? (say parallel connect, same two nodes, I want the...
Hello forum moderators,
I am in the process of applying to Masters programs in Electrical Engineering. I have finished a rough draft of my Statement of Purpose and would like to get some feedback on it. Could I possibly post it in a thread in this particular forum? If not, where should I post it?
Hello all, I am not sure if I am posting in the correct place. I am currently in community college, for now I think I am doing physics. Regarding the courses for physics, am currently taking mechanics and calculus 2. Spring I will take physics 2 which I believe is electricity and magnetism as...
Homework Statement
Given that F is a family of sets, that \bigcup F is the union of the sets members of the family F, that A is a set, assume that
(1) \hspace{1cm} \forall F (\bigcup F = A \rightarrow A \in F)
then prove that
(G) \hspace{1cm} \exists x (A= \left\{ x \right\} )...
Need Some Honest Feedback On "late Bloomers."
Ok, here's my current scenario. I am 34 and changing career paths to one in physics. I have always loved the sciences ever since I was a child, but a dysfunctional family upbringing stunted my life pursuits. I was never pushed to pursue college, and...
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hi!
can someone please help me with this problem...i have to match the open loop respone to the close loop unity feedback system of a control system.
what is the relation between the two?
thanx in advance
Hello, everyone! I am new to the forums here, so I will start with a brief introduction. My name is Martin Pulido, and I am philosophy graduate who also happens to love card games (as well as board games). Card games not only illustrate philosophical ideas (War=Determinism), but many are also...
This is my first post here.
I'm currently learning about Negative feedback.
Normally, When we want to know the open loop gain, we rewrite circuit(a) to circuit(b).
My question is why do RE1,RF,RE2 from circuit(a) turn into what we see circuit(b)?
what is a theory behind this?
In...
Hello everyone!
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Problem is simplied.
Assume ideal gas @ atm pressure & temperature.
Completely seal the needle end of a syringe.
Assume bottom end of syringe is completely sealed (can move in axial direction).
Q1.
If I press on the syringe (pressurize inside), is if correct to say that the pressure...
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Hi,
Would anyone like to critique my physics paper "The Greenhouse Effect"... it's only in draft stage but would definitely like some feedback positive or negative... not just on the material but on the overall structure as this is the first science paper I have done at university; I don't...
Hi
this is my first subject in this forum and i hope you can help
1.we have been given an assignment to analyze this non-ideal op amp with both positive and negative feedback and to be honest i don't even know where to start
i know i should post an attempt of trying to solve but honestly...
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I understand that for an op amp to have a controllable gain, the difference between the input terminals must be very very close to zero (and you can assume it is zero). And to do this you use negative...
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For the record this is just a...
Now we can get many devices that can make guitar sustain longer, even sustaining it indefinitely or to be more precise, sustaining forever. For example, the EBow,(http://www.ebow.com/home.php) the Fernandes Sustainer and the Sustainiac. But I believe, even when the battery power will not getting...
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Consider an op-amp in which there is a DC voltage of 100mV for example applied to the non-inverting (positive) terminal of the op-amp and the negative terminal of the op-amp is connected to the output directly. Also take the voltage supplied to power the op-amp, Vcc, to be 15V and the gain, A...
Hello guys, hope everything is going well. Anyways, I was thinking recently about the forumla for finding the distance an object has traveled with a constant acceleration using the formula
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So basically when thinking about this formula, I like to think about an...
Homework Statement
Identify 10 feedback systems that you encounter in your everyday environment. For each system, identify the sensing mechanism, actuation mechanism and control computation. Describe the uncertainty with respect to which the feedback system provides robustness and/or the...
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...