108 questions
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Why is the numerator coefficient array returned by scipy.signal.cont2discrete two dimensional?
I'm converting a continuous-time dynamical system to discrete time using the function cont2discrete from Scipy's signal processing library.
dt = 0.1
num, den, dt = scipy.signal.cont2discrete(([1], [5, ...
- 11.7k
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17
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How to accurately draw a Bode diagram of a control system in MATLAB in the case of its matrix being ill-conditioned?
I'm trying to draw a bodeplot of a discrete contorl system with the "ss" and "bodeplot" function:
% X(k+1) = AX(k)+Bu(k)
% y(k) = CX(k)+Du(k)
sys_d = ss(m_A, m_B, m_C, m_D, Ts);
h1 ...
- 1
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35
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In matlab simulink how can I use an inport as a coefficient in a transfer function?
I have a fairly simple transfer function to model in matlab. It's this:
K_in/(M*s+1), where M is a defined variable and K_in is an inport.
In simulink it looks like this:
K_in -----> Tranfer fcn: 1/...
- 131
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19
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Unable to find inverse Laplace transform of function MATLAB
I would like to take the inverse Laplace transform of the following:
The result after running z_use = ilapace(Z_use) is:
MATLAB is unable to take the full inverse Laplace transform. Is there ...
0
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0
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31
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Signal processing; block structure. Finding the transfer function to the system
The implementation scheme for a causal LTI digital system with one
input, x[n], and one output, y[n] is shown in Figure P3. In the
figure, z−1 represents a unit sample delay and α is a scalar constant....
1
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1
answer
89
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Find Eigenvalues of ODE45 Solution MATLAB
I have the following non-linear ODE:
I have the following ODE45 solution:
fun = @(t,X)odefun(X,K,C,M,F(t),resSize);
[t_ode,X_answer] = ode45(fun,tspan,X_0);
The input matrices are stiffness K(X), ...
0
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1
answer
111
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Find Transfer Function from FFT Plot MATLAB
I have the following FFT plot:
I don't know if this is possible, but I would like to find a transfer function from this FFT plot in MATLAB.
This is what I have done so far:
np = 2; % number of poles
...
1
vote
1
answer
312
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Series digital filtering: how to combine the transfer function coefficients of each filter?
I'm performing two filtering steps in series, in Matlab. First a Butterworth filter, then a ChebyschevII filter. The functions butter() and cheby2() return the transfer function coefficients b (...
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6
votes
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answers
231
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How can I extract elements from a transfer function matrix in Octave?
I am working with Octave in the control package, and I want to take an array of transfer functions (initialized as follows) and just extract the diagonal elements of the matrix. Whenever I try to do ...
- 111
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votes
2
answers
265
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MATLAB tf command and exponentials
I must be missing something obvious but why does MATLAB have these two different behaviors?
Compare,
>> s = tf('s');
>> G = exp(-2.1*s)/(s+10)
G =
1
exp(-2.1*s) * ---...
- 3,870
0
votes
1
answer
473
views
Settling time is not displaying on the step response graph
I am graphing the step response of a closed loop system and I need to display the settling time on the graph for my assignment. Here is my code:
s = tf('s')
L = (20*(s+1))/(10*s*(s-1))
T = L/(1+L)
...
- 45
-2
votes
1
answer
445
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Matlab get transfer function from Simulink
Is it possible to use MATLAB to retrieve the data from Simulink from this block diagram and plot the transfer function?
I have already tried using tf, but that did not work.
res = sim("Test.slx&...
- 1
0
votes
1
answer
268
views
Numerator and denominator input syntax of matlab control system : (num,den)
I have seen the following form of writing in many matlab routines：
for example, I have a system function
num=1;
den=[1 0 0];
sys=tf(num,den)
If I want to show the step response, or bode plot, I just ...
- 43
0
votes
1
answer
551
views
Python Transfer Function with exponential term in the numerator
transfer function
How would I input this transfer function in python? I'm having trouble with the exponential term in the numerator.
I'm currently using the python control systems library; is it ...
- 1
0
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0
answers
223
views
How to convert a np.meshgrid() function to a complex function?
I'm trying to create a script that plot a 3D magnitude surface graph of a transfer function using python.
I used as an example for my code, this other code made for matlab that works.
#Example using ...
- 1