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The University of Southampton

Research project: Hybrid active and passive structural noise control

Currently Active: 

Space missions that involve satellites with highly sensitive instrumentation packages perhaps raise the most challenging vibration control issues. Often these packages must be supported on structures where the vibration levels have been reduced to micro-levels. Needless to say that these instruments, that may form one of the individual sensors of a multi-sensor interferometric telescope or synthetic aperture radar, must function correctly. To add to the complexity of the problem, they are sitting on structural booms tens of meters apart with the relative motions between their ends restricted to microns over wide ranges of excitation frequency. Despite a number of proposed design approaches in this field, it is still not clear how best to proceed to meet these demanding requirements.

Using advanced passive techniques, an overall reduction in vibration transmission of 31.0 dB is achieved in an essentially undamped structure. The amounts of attenuation achievable for active control with one, two and three actuators are found to be 15.1 dB, 26.1 dB and 33.5 dB, respectively. With the combined passive control (using 10% geometric deviations) and active control (using three actuators) an overall reduction of 49.5 dB is achievable in practice.

The experimental setup for the AVC with one piezoelectric stacked actuator positioned on beam 41 of the boom structure model
The experimental setup for the AVC

Associated research themes

Mechatronics, signal processing and control

Related research groups

Signal Processing, Audio and Hearing Group

Key Publications

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