How to derive state space model or transfer function for MISO system using system identification tool or neural network tool.

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maddikayala venkateswarlu 2017-3-16

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https://ww2.mathworks.cn/matlabcentral/answers/330127-how-to-derive-state-space-model-or-transfer-function-for-miso-system-using-system-identification-too

评论： Star Strider 2017-3-16

I have two inputs i.e.,speed and super heat and one output i.e.,step position. i have set of data for both inputs and output. here my problem is i want to write a state space model or transfer function for given get of inputs and output data.

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Answer 1

Star Strider 2017-3-16

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https://ww2.mathworks.cn/matlabcentral/answers/330127-how-to-derive-state-space-model-or-transfer-function-for-miso-system-using-system-identification-too#answer_258942

See How can i create a FFT/FRF graph using matlab from csv file? for an example.

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maddikayala venkateswarlu 2017-3-16

With that code is it possible to get mathematical equation..?

Star Strider 2017-3-16

You can get a transfer function or a state-space realiseation. You have to choose the ‘correct’ number of poles (and zeros) in your system (the minreal function can help you refine it).

If you choose a s-space (continuous) transfer function realisation, you can probably express the transfer function as a differential equation in the Laplace domain that you can invert to create the solution of the differential equation. I never tried this, so you will have to experiment with it.

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