Is it possible to plot Jerk?

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Is it possible to plot Jerk?

Postby Peter_K » Thu Nov 02, 2017 3:25 am

I have an EMA application with a linear axis where a servo motor is directly driving a ball screw to lift a load. During the predominate portion of this machine's life, it will be oscillating a load in a sinusoidal fashion.

For purposes of ensuring that I am not exceeding the limits of my ball screw, I'd like to plot the Jerk of the system. Would I accurately represent Jerk by using the Plotting>Advanced>Rate of Change formula on Acceleration?

Thanks,
Peter K
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Re: Is it possible to plot Jerk?

Postby Jacob Paso » Thu Nov 02, 2017 8:33 am

Yes, Jerk is accurately represented by using the Plotting>Advanced>Rate of Change formula on Acceleration. This works very well for the Target. It doesn't work so well on the Actual, due to the extreme quantization error.
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Re: Is it possible to plot Jerk?

Postby Peter_K » Thu Nov 02, 2017 10:07 am

Jacob-

Thanks for the tip about using target acceleration! I hadn't considered this and it makes a big difference on the result (attached)
Attachments
Jerk Tar Vs ACT.rmcplots
(2.03 MiB) Downloaded 39 times
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Re: Is it possible to plot Jerk?

Postby Jacob Paso » Thu Nov 02, 2017 10:20 am

That looks good! I am surprised the actual jerk shows up so cleanly, but looks like the filtering on the actual acceleration is pretty good, which helps a lot.
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