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Old 28th October 2009, 08:23 AM   #11
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Default slightly off-topic

Was reading the rythmik servo docs and found this in their FAQ about the speed of the processing:
This is very different to accelerometer-based approach, which place the sensor on the cone under the dust cap. There is a finite distance between the voice coil and the accelerometer, and as a result there is a response time.
Umm, the response time is not the placement of the piezo quartz used as the accelerometer. It's the math! The phase is off by 90 degrees for the conversion from acceleration to displacement. And when the phase is off, your timing for when to apply correction is off too. Who writes this stuff?

Relationship Among Displacement, Velocity, Frequency, and Acceleration During Sinusoidal Motion
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