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Low Gain and High Gain Modal Damping Techniques for Noise Reduction and Ringdown Control

This document discusses the principles of modal damping and its implementation in systems with low and high gain settings. It outlines the characteristics of damping noise and ringdown in varying gain scenarios, providing insights into the appropriate filter structures. Specifically, the filter design includes two low-passing poles at twice the resonance frequency and a two-zero gain bump at resonance, enhancing performance through a total of four poles and two zeros per mode. The real-world estimator illustrates the damping force vectors and sensor signals within a modal damping block diagram.

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Low Gain and High Gain Modal Damping Techniques for Noise Reduction and Ringdown Control

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  1. Modal Damping Notes Brett Shapiro 8 June 2011 G1100755

  2. Low Gain Modal Damping Noise

  3. Low Gain Modal Damping Ringdown

  4. Low Gain Modal Damping Loop Gain

  5. High Gain Modal Damping Noise

  6. High Gain Modal Damping Ringdown

  7. High Gain Modal Damping Loop Gain

  8. Modal Damping Filters The filter includes 2 low passing poles at twice the resonance frequency and a 2 pole, 2 zero gain bump at the resonance. Total of 4 poles and 2 zeros per mode.

  9. Pendulum Real World Estimator G1 G2 Modal World G3 G4 Modal Damping Block Diagram x = sensor signals q = vector of modal signals Pm = modal damping force vector P = Euler damping force

  10. X Modal RCG Implementation Pole count for X damping: Estimator = 8 per filter, Dampers = 4 per filter -> Total = 80.

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