Extracting a response time in simulink

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Oliver McEnteggart 2012-7-27

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So I have a control system in simulink which I have put into a test harness and I want to find the response time for that system to a step function. So I made a subsystem that returns a 1 when the demand and output systems are within 1% of each other and want to be able to extract a response time by taking the time taken for the 1 to appear away from the time at which the step function switches on but I'm stuck on how to do this. Any ideas?

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TAB 2012-7-27

编辑：TAB 2012-7-27

You can use Compare block to check when data is moved to 1. Is it not OK for you ?

Oliver McEnteggart 2012-7-27

That's what I have used but how to I get the value of t when it moves to 1 from that?

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TAB 2012-7-27

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https://ww2.mathworks.cn/matlabcentral/answers/44674-extracting-a-response-time-in-simulink#answer_54748

编辑：TAB 2012-7-27

Ok, I think you need Sources\Clock block.

It gives the simulation time. You can capture the time output of this block when your comparision satisfied.

-----OR-----

You can log the your data to workspace using To Workspace block selecting format as structure with time. Thus data will be saved in structure format at each time step.After simulation, using matlab commands you can find when the data reached to 1.