Signal Processing Stack Exchange
Signal Processing Stack Exchange

Questions tagged [bode]

34 questions
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2 answers

Which step response matches the system transfer function

A system has the following open loop bode plot: - Which one of the plots below describe the closed loop step response for the entire system? My attempt My initial thought was to look at the static gain from the open loop bode plot, which is…
Carl
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Mismatch between the frequency response of a transfer function and bode plot

I generate a state space model as follows (The details are not important. This part is used to get matrix A_xi and B_xi and the state space model is xi(k+1) = A_xi*xi(k)+B1_xi*u0(k); y(k) = x(k)): % vehicle dynimcs h = 0.8; % time headway N = 4; %…
SoftSail
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1 answer

Creating Bode Plot from Experimental Data

I have a blackbox system in which I can input a function and obtain the output signal (in MATLAB). I'm attempting to reconstruct a Bode diagram and have had success with the Magnitude plot, however, I'm having a lot of difficulty with the phase…
migeve3630
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How do bode plots work with unstable systems work?

If I had a system with right-half s-plane poles, how would a frequency response work? Since a purely imaginary value for s, would cause the Laplace transform to diverge for such a system, what meaning would a bode plot have in such a situation?
Colin Hicks
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1 answer

Differences between MATLAB and WolframAlpha and AstromMurray (minimun phase)

I have the following problem when I graph the phase of my transfer function in matlab I get that it starts at 360 while with wolfram it gives me 0 and if I do the calculation that is in astromurray it gives me that the system also starts at 0, a…
MaxPower1995
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Bode plot of the transfer function with unstable pole

Let's say I have a LTI system described by following transfer function $$G(s) = \frac{(s+1)}{s(\frac{s}{10} - 1)}.$$ As soon as I run following Matlab code s = tf('s'); G = (s + 1)/(s*(s/10 - 1)); bode(G); I receive following Bode plot The…
Steve
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How to deal with "weird" phase plots in bode diagram when designing a controller

I am trying to design a balance controller for a robot. With MATLAB simulink I arrived at the transfer function between the input and the pitch angle for the robot. I have plotted the bode and Nyquist plot below. As you can see, the Nyquist plot…
Carl
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1 answer

Why if I place the zero of the lead compensator at lower frequencies, do I obtain a resonance peak?

I am studying control systems, and I am studying the lead and lag compensator. I have seen than if I use a lead compensator for the closed loop transfer function, $T(s)=\frac{s+2}{(s+1)(s+8)},$ with the designed lead compensator, $lead(s) =…
J.D.
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bode plot, zero at 0Hz

I'm learning to draw magnitude bode plots from transfer functions: $$ H(s) = \frac{sRC}{sRC+1} $$ So I can see that I have a zero at s = 0, which corresponds to 0 Hz. I know this will add a +20dB/dec slope for all frequencies in a logarithmic plot.…
Sittin Hawk
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Matlab - Bode plot of Lag Filter + Integrator

I am rather new to Matlab and I just cant make sense of what I see in the bode plot of the continuous and discrete version of the same function. The bode plot of the continuous function looks as expected. However the bode plot of the discrete…
Martin
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Could someone please explain how to get frequency response of a given Bode Plot?

Having trouble with bode plots. I understand that the is to be converted to $dB$ but after that I'm stuck. Could someone please show me how this graph gives a frequency response of $10/1+jw10$
towns
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How can I find the transfer function from this Bode diagram?

I've been given this bode diagram : I've been asked to find the transfer function only by using the bode diagram. It's the first time I'm doing this so here's what I thought. The starting value is zero so the multiplying constant of the the…
John Katsantas
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Slow and fast filter

According to my knowledge a filter with low cut off frequency is called slow and with hgih cut off frequency is called fast filter. I am trying to understand more about these two. I know what happens to signal when it goes through these 2…
Aashu10
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amplitude at exact frequency in wide band signal

Could anyone suggest the most computationaly efficient method for finding amplitude of exact frequency having a noisy wide band signal. To be more specific about a task. I have some physical dynamical system. I'm introducing sinusoidal input with…
aliko
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Bode plot of transfer function with vs without feedback

I am looking at some old exams. Particularly, one question where there is a Bode plot of a transfer function $G(s)$, and some questions about the Bode plot. So far so good. However, part b) of the question starts asking questions about when the…
J. Doe
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