2022 Developer Survey is open! Take survey.

Questions tagged [bode]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
1 vote
0 answers
29 views

How can to obtain the hughcut, lowcut and bode constant of a bandpass digital filter?

I need to create a bandpass filter amplifier in python; and determine the transfer function, graph the bode diagram, and print the highcut frequency, lowcut frequency, the bode constant and the ...
user avatar
0 votes
0 answers
28 views

How can to obtain the transfer function of a bandpass digital filter? [duplicate]

I've been asked to: create a bandpass filter amplifier in python, determine the transfer function, graph the bode diagram, and print the highcut frequency, lowcut frequency, the bode constant and the ...
user avatar
1 vote
1 answer
81 views

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 ...
user avatar
1 vote
2 answers
65 views

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 ...
user avatar
  • 231
0 votes
0 answers
34 views

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 ...
user avatar
  • 101
2 votes
0 answers
45 views

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)): <...
user avatar
0 votes
1 answer
131 views

Z domain Transfer function to magnitude

How would one go about calculating the Magnitude of... $\mathcal{Z}$-transform = $$\frac{1}{1-z^{-2}}$$ I understand that z can be replaced with $${exp}^{j\omega}$$ and I am aware of the identities $${...
user avatar
0 votes
1 answer
40 views

Finding transfer function from bode plot

Given a bode diagram From the figure, I see that when $\omega = 100 \text{ rad/s}$ the magnitude response starting to go down and when $\omega = 1000 \text{ rad/s}$ the slope become higher. Then $$H(...
user avatar
  • 113
0 votes
1 answer
285 views

Stabilizing an unstable system and removing oscillations from step response

I have a system with the transfer function given in this MATLAB code ...
user avatar
  • 298
1 vote
2 answers
233 views

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 ...
user avatar
  • 298
2 votes
1 answer
362 views

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'...
user avatar
4 votes
2 answers
543 views

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 ...
user avatar
  • 298
0 votes
0 answers
143 views

System identification from Bode plot

Please can anyone address me to routines (possibly for MATLAB/Octave) to identify system poles and zeros from its Bode plot (magnitude+phase)? I am aware there are functions for system identification ...
user avatar
0 votes
1 answer
233 views

What is the frequency of the Gaussian white noise model in control systems?

The design of control systems, particularly for SISO systems, is made convenient by tools such as Bode plots and the corresponding Nyquist stability criterion. These concepts allow engineers to design ...
user avatar
-1 votes
1 answer
822 views

Bode plot from from step response data

For quality control, I want to measure the frequency response of hardware I built. What I can easily generate on the hardware is a step response. Thus, I want to derive the magnitude and phase from ...
user avatar
  • 111
0 votes
1 answer
41 views

Why is my MATLAB's bode plot wildly off?

I will give out all the details in case it is relevant. I have a MIMO state space system. I find its bode plot using MATLAB and separately using Mathematica. The plot from MATLAB is wildly off ...
user avatar
  • 103
0 votes
1 answer
216 views

Analyze stability of a closed loop system with Bode

How can one know, with just looking at the Bode plots, if the closed-loop system is going to be stable or not? This closed-loop system is unstable, why? @DSP Novice @Jake It was my fault that the ...
user avatar
  • 1
1 vote
1 answer
53 views

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 ...
user avatar
  • 183
1 vote
2 answers
178 views

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/...
user avatar
0 votes
1 answer
134 views

Find the error in phase angle and dB gain Function Transfer

This is a question paper that I've tried to solved but seems I am missing something. My attempt: $$ |G|_{w=0} = K$$ So, $\require{cancel}|G|_{w=0.5a} = \dfrac{K}{\left|1+\dfrac{j0.5\cdot \cancel{a}...
user avatar
1 vote
2 answers
170 views

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 ...
user avatar
  • 11
0 votes
1 answer
198 views

How to draw the magnitude plot of a variable slope low/high pass shelving filter? (eg. as a function of cascaded shelving filters)

I am interested in making a magnitude graph of a variable slope low/high pass filter. I would like to set slope in dB/oct and a cutoff pitch. The y-axis should be amplitude from 0 to 1, and the x-axis ...
user avatar
  • 429
2 votes
1 answer
1k views

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 ...
user avatar
0 votes
1 answer
1k views

Is there a way to obtain the transfer function from a bode plot on Python? (I know that it is possible on Matlab)

Quite simply, I have a bode plot obtained from a source signal. Now I wish to obtain the transfer function. I know it is possible with Matlab: http://www.mathworks.com/help/ident/examples/frequency-...
user avatar
  • 31
0 votes
2 answers
339 views

How to make bode plot when output signal changes amplitude?

When I do frequency analysis on my feedback controlled system and the controller is really tightly tuned, I get a frequency response that looks like this: Blue is excitation signal and green is ...
user avatar
  • 246
0 votes
0 answers
438 views

rank-1 array error using bode function

Some time a go i got a matlab script for speaker design. But since i don't use matlab i try to edit to python. Now i have a problem with the script. Since it is in the bode i was doubting which place ...
user avatar
  • 335
1 vote
2 answers
2k views

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 $10/1+jw10$
user avatar
  • 13
1 vote
0 answers
64 views

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 ...
user avatar
0 votes
1 answer
379 views

What is the frequency response function for the Bode Plot pictured here?

I've forgotten how to get the frequency response function out of a Bode Plot. The phase component of $H(j\omega) = e^{j\pi/2}$, right? But I am having trouble finding $|H(j\omega)|$. How would I get ...
user avatar
0 votes
1 answer
303 views

Derive Bode Diagram from difference equation

I have designed a 2nd order low pass butterworth filter for the following: Sampling Frequency: 10kHz. Cut-off Frequency: 1kHz After doing a bit of maths I worked out the difference equation: ...
user avatar
0 votes
1 answer
2k views

Matlab freqz and custom implementation differences

I am making some homemade tools on Matlab. I made function that plot the frequency response of a discrete transfer function (just like freqz does). When I compare ...
user avatar
1 vote
1 answer
2k views

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 ...
user avatar
  • 75
0 votes
1 answer
2k views

Bode plot of discrete-time transfer function $H(z)$

$H(z)$ is the transfer function of a biquad filter as described here. I would like to plot the Bode plot of the magnitude response of $H(z)$. Scipy has a bode method (...
user avatar
  • 103
1 vote
0 answers
65 views

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 ...
user avatar
  • 111
0 votes
1 answer
2k views

Phase wrapping in Bode plot

I'm trying to model the transfer function of a linear system (a MOEMS mirror) based on a datasheet plot of its response. I'm developing the model in the python-control model and I think that I've got ...
user avatar
  • 103
0 votes
4 answers
16k views

Analyze stability of a closed-loop system with Bode

I have an open-loop system function $L(s)$ and its Bode plot is As MATLAB says, it is stable if we close the loop with unitary feedback. I thought that, seeing the Bode plots one could tell if the ...
user avatar
  • 4,842