A summary of general considerations in active vibration isolation obtained from our experience in developing a testbed system is given. Application of this perspective is illustrated by a description of the testing facility and the results achieved to date. These include broadband active vibration isolation of 20 dB over a decade wide frequency band on the nearly full-scale testbed. Significant features of the testing facility are a s m a l l diesel engine mounted on a representatively complex structural foundation, the correspondingly complex open-loop transfer h c t i o n of the system, and the use of a hybrid analog/digital controller, to partition the compensation filter frequency coverage.
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