whether matlab function block and trigger block can be linearized?

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Li Yang 2016-2-16

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https://ww2.mathworks.cn/matlabcentral/answers/268449-whether-matlab-function-block-and-trigger-block-can-be-linearized

评论： Connor Landrum 2019-4-23

Hi, I am modeling a motor control system. In my controller, I am using (1) matlab function block to do some calculations; and (2) triggered blocks to simulate the different updating speed of my outer and inner PI control loop. Now I want to use the PID tuner to find pi gains for my outer loop(has 1 PID controller) and the inner loop(has 2 PID controllers), but the PID tuner just can't launch. So I am wondering if a simulink model like mine can actually been linearized?

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Anish Mitra 2016-2-23

Is there a specific error message?

When I add switches in a model (in R2015b) and then try opening the PID Tuner - it does open and then show a message stating that the plant cannot be linearized. Do you see something similar?

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Answer 1

Arkadiy Turevskiy 2016-2-24

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Hi, Triggered subsystems are discontinuous and would typically not linearize.For cases when exact linearization does not work, the best approach is to compute linear model approximation using simulation data.

The workflow for this is shown in this video and explained in this doc example .

Hope this helps.

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Connor Landrum 2019-4-23

Hi Arkadiy,

You mention triggered subsystems, does that only include triggered blocks, or are matlab function blocks also triggered subsystems, and if so would similar methods work to compute a linear model approximation?

Thanks

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