Experimental investigation on an active floating raft vibration isolation system based on a flexible hull structures

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Journal of Vibration and Shock ›› 2013, Vol. 32 ›› Issue (17) : 145-149.

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Experimental investigation on an active floating raft vibration isolation system based on a flexible hull structures

ZHOU liubin YANG tiejun ZHANG pan PAN jiangjiang LIU zhigang

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Abstract

An active floating raft vibration isolation system was developed. Four hydraulic actuators in parallel with eighteen BE-400 type passive resilient isolators were placed between the floating raft and the hull structure. Based on filtered-x LMS algorithm and off-line secondary path modeling, a four-input and four-output adaptive feedforward control strategy was employed experimentally, where each actuator was operated independently by feeding back the absolute acceleration near its mounting location. The experimental results show that the vibration level of error sensor positions on the flexible hull structure can be reduced greatly, active reductions are from about 7dB up to 46dB at the exciting frequencies, and 3dB~8dB total vibration reduction in the range of 0~400Hz are obtained experimentally for the multichannel control systems.

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floating raft / active vibration isolation / flexible hull structure / experimental investigation

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ZHOU liubin YANG tiejun ZHANG pan PAN jiangjiang LIU zhigang. Experimental investigation on an active floating raft vibration isolation system based on a flexible hull structures[J]. Journal of Vibration and Shock, 2013, 32(17): 145-149