peak to peak amplitude comparison

Question

gigi 2019-10-7

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https://ww2.mathworks.cn/matlabcentral/answers/483978-peak-to-peak-amplitude-comparison

评论： Daniel M 2019-10-7

msrmnt.txt

My system measures the speeds of two shafts with quarature encoders. As you can see from the below graph their speeds are fluctuating (I also upload the measurement data).

I need to compare the peak to peak amplitudes of these two shaft speeds in a Simulink model (in Real-time).

I tried to find max and the min values, so I used "Find Extrama" block but it gaves error as "o find a peak the input must have three or more samples per channel".

Same error is also seen when I used findpeaks command in Matlab Function block.

Thanks in advance for any help.

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Answer 1

Daniel M 2019-10-7

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You can't find the peak of a single data point. It is telling you to provide more data points in order for the function to work. You can use the buffer block in simulink to build-up some data points. I suggest 1 period of the oscillation, so it can capture both the max and min of the signal. Note however, that this adds a latency to your real-time model (not that it isn't still real-time in terms of throughput). I'm not familiar enough with Simulink to provide another solution.