Convert a continuous zero-pole block into a discrete zero-pole in Simulink

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Nicolo' Botti 2022-1-5

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https://ww2.mathworks.cn/matlabcentral/answers/1622910-convert-a-continuous-zero-pole-block-into-a-discrete-zero-pole-in-simulink

评论： Mathieu NOE 2022-1-6

Hi everybody,

I'm trying to convert a continuous zero-pole block into a discrete one in Simulink. More in detail, I have an experimental FRF, I've obtained the residuals and the poles using the 'residual' matlab function and then I've obtained the zeros, poles and gain using 'zpk'.

However the poles and the zeros that I have only works for building a continuous transfer function in Simulink (using zero-pole block, which works in 's' domain), but instead I need the definition in discrete time (discrete zero-pole block, so in 'z' domain). The problem is that if I use my zeros and my poles in the discrete zero-pole block definition and I give for example a white noise in input, the response diverges.

However, I'm not able to directly obtain zeros and poles of my transfer function in 'z' domain, so I was thinking about switching from 's' to 'z' domain in Simulink.

Does anyone know how can I convert the continuous time zero-pole block into a discrete zero-pole block? Is there something already implemented in Simulink?

Thank you in advance,

Nicolò