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Acceleration to Amplitude versus time

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Yasmeen Ismail
Yasmeen Ismail 2019-3-28
回答： Amal George M 2019-4-1
Hello,
I have accelerometer data of acceleration versus time, and I need to integrate it twice to get amplitude versus time to eventually use the fourier transform to get a frequency. Currently, when I use cumtrapz to integrate the data it will always give me a pretty straight line. I need it to be something that looks like a sinusoid. Can you explain why this is happening/what I can do to fix it?
Also, how would I do the fourier transform on something that is an array with time and amplitude components (it seems as though fourier only takes in a single vector)?

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Amal George M
Amal George M 2019-4-1
It looks like the acceleration value is always positive. If appropriate, consider negating the effect of gravity from the data.

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