any input function to transfer functionm

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John Krzykacz 2019-3-12

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评论： Aquatris 2019-3-13

In Matlab ezxamples the input to transfer functions are definite i.e. defined mathematically.

I need to enter to a transfer function my own a function/array created in my Matlab code. It is a random array, without any analytical /mathematical expression.

Can I use this array as an input to a transfer function? (I suspect Matlab should calculete its Laplace transform "on line").

Thanks- bj

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Answer 1

Aquatris 2019-3-13

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在 MATLAB Online 中打开

I think the function you are looking for is lsim().

The usage is pretty simple.

t = 0:1e-3:10;        % time vector
u = rand(length(t),1);% random inputs
sys = tf(100,[1 2*0.1*10 100]); % transfer function
[y,t] = lsim(sys,u,t);

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John Krzykacz 2019-3-13

Thanks for your answer.

My function is an array generated in a loop. Its values are "random" in a sense, that the values depend on many factors. The function does not have any formula.It is an array of real numbers. The array is created in a loop with time t=t+dt, but the range of time varies.

I think the problem is in calculating the Laplace transform of the functiom, as it is an input to a transfer block.

Thanks- jk

Aquatris 2019-3-13

I can't help much more with the limited information. However, I can suggest converting the transfer function in to state space form and writing your own solver using Euler integration or Runge-Kutta. This way you can calculate the input however you want.

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