Proper Implementation of Transfer Function

Question

Zachary Rago 2022-2-21

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1654590-proper-implementation-of-transfer-function

编辑： vidyesh 2023-10-11

So I'm following this example here:

https://x-engineer.org/quarter-car-suspension-transfer-function/

Trying to create a quarter car simulation. As far as I can tell my transfer function is correct but clearly the simulation is not resulting as it should.

Is my block diagram laid out incorrect.

(I know this would be easier with integrators but I want to use the transfer function as it is a requirment for this project)

clc;
close all;
clear;
m1=290;
m2=15;
k1=16200;
k2=191000;
c1=1000;
c2=2500;
zs4 = m1*m2;
zs3 = m1*c2+m1*c1+m2*c1;
zs2 = m1*k2+m1*k1+c1*c2+m2*k1;
zs = c1*k2+c2*k1;
z_ = k1+k2;
us2 = c1*c2;
us = c1*k2+c2*k1;
u_ = k1+k2;
den = [zs4,zs3,zs2,zs,z_];
num = [us2,us,u_];
z_u = tf(num,den)

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Answer 1

vidyesh 2023-10-11

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1654590-proper-implementation-of-transfer-function#answer_1330829

编辑：vidyesh 2023-10-11

在 MATLAB Online 中打开

Hi Zachary Rago,

I understand that you want to know why your signal graph differs from the one provided in the source link you shared.

It appears that the values of 'z_' and 'u_' are being calculated incorrectly. To rectify this, I suggest substituting the following lines in your code for calculating 'z_' and 'u_':

z_ = k1*k2;
u_ = k1*k2;

Additionally, it is unclear from the diagram which block is being used to represent 'num/den'. To clarify this, I recommend using the 'Transfer Fcn' block.

Hope my answer helps.