How to plot step response of second order system?

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theblueeyeswhitedragon
回答： Afshan.N. 2023-7-13
omgNot = 1;
zetaNot = 0.6;
H = tf(omgNot^2,[1, 2*zetaNot*omgNot, omgNot^2]);
stepplot(H)
I am using the code above to plot the step response of a second order system, but I am getting the follwoing error
Invalid default value for property 'InputName_' in class
'DynamicSystem':
Attempt to execute SCRIPT strings as a function:
I would really appreciate your help. Thank you.
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theblueeyeswhitedragon
theblueeyeswhitedragon 2019-2-4
How do i fix this problem? Is there a way to add the .m file to this folder?
madhan ravi
madhan ravi 2019-2-4
The best option is to contact mathworks support team by clicking the Contact Us button on the top right corner if this page. And finally post the solution (the reason) provided by them as an answer and accept it so it might be helpful for others.

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回答（4 个）

Hiroumi Mita
Hiroumi Mita 2019-2-4
Do you have any MATLAB workspace variables pre-defined and the name is such as,'tf' ,'sterpplot', or ' DynamicSystem'?
Needless to say, double defined same name of pre-defined functions and workspace variable is prohibited.
The reason is priority of workscape name and functionname depends on the prioirty of MATLAB path.
If you have 'tf' where is in MATLAB workspace variable , this is the highest priority.
Second, if you have 'tf' function or other famous name's function you personally programed in current directory which name is same as functions as provided by toolboxes , the function located in current directory has higher priority than Toolboxes.
Please check above.
In my environment , your scriput runs normally.
  1 个评论
madhan ravi
madhan ravi 2019-2-4
It would have been crystal clear when typing
which ... -all
as the OP has posted the results of it , neither it is a variable or a custom made function/script. Possible reason could be that the OP has made some changes in the default script file.

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Vikas Panit
Vikas Panit 2021-8-18
You can use the MATLAB pre-defined variables of Control Systems Toolbox to solve the following problem. If you dont have Control Systems toolbox download from here - https://in.mathworks.com/products/control.html
Here is the code you can use to find step response of second order system and command window output:
wn= input('frequency')
zeta= input('damping factor')
k= input('constant')
num= [k*wn^2]
deno= [1 2*zeta*wn wn^2]
g= tf(num, deno)
t= feedback(g,1)
step(t, 'r')
Martial Mezatio
Martial Mezatio 2022-2-1
clear all
close all
s=tf(s);
g=1/2*s+1);
step_g/s)
Afshan.N.
Afshan.N. 2023-7-13
wn= input('frequency') zeta= input('damping factor') k= input('constant') num= [k*wn^2] deno= [1 2*zeta*wn wn^2] g= tf(num, deno) t= feedback(g,1) step(t, 'r')

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