PSN-L Email List Message
Subject: Soft Force Feedback
From: Chuck/Judy Burch cjburch@...........
Date: Sat, 21 Feb 2009 13:46:23 -0700
You have advocated a "soft" feedback scheme for seismometers owing to
improved sensitivity at long periods. Conventional PID force feedback
schemes, such as that used in the STS-1, are well described in numerous
publications. I assume you are suggesting an "I only" scheme (no P or
D). Is the feedback current deliberately weak so as to allow some
movement of the reference mass, yet strong enough to keep it from
hitting the pins? Is the idea to integrate over one frequency range and
observe events in another frequency range? Or do you suggest allowing
the integrator to see the entire frequency range of interest?
Thanks for any details you can provide.
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