Phase shift accommodation in active vibration damping system
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United States of America Patent
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Nov 9, 1999
Grant Date -
N/A
app pub date -
Mar 23, 1998
filing date -
Mar 23, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An active vibration damping system (e.g. an active tuned mass damping system) uses phasor techniques for accommodating excessive phase shifts in system components (e.g. amplifier and actuators). Optimal control techniques are used to determine preliminary coefficient values for the controller model. These preliminary coefficients are scaled to account for differences in units and the scaled coefficients are then used to determine phase angle and relative phasor magnitudes. For each component of the control force on the tuned mass, the respective phasor is shifted to accommodate a known phase shift in the system while maintaining the same relative phasor magnitude for each component. The phase-shifted coefficient values are then scaled to return the coefficients to the original units, and these coefficients are used in the controller to generate the command signal to drive the actuator that provides the control force on the tuned mass. This technique can accommodate substantial phase shifts without rendering the system unstable.
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