Line spectra reduction of vibration isolation system based on tracking chaotification method

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Journal of Vibration and Shock ›› 2011, Vol. 30 ›› Issue (7) : 40-44.

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Line spectra reduction of vibration isolation system based on tracking chaotification method

ZHANG Zhen-hai; ZHU Shi-jian; LOU Jin-jun`

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Abstract

Line spectra in the radiated noise of marine vessels are the most visible signs, which can be detected, tracked and identified by enemy’s passive sonar. The chaotifying technique for line spectra reduction can reduce the line spectra for improving the acoustic stealth of marine vessels，based on the fact that response spectrum of a nonlinear system under harmonic excitation is a continuous one when chaos occurs. In order to overcome two difficulties, i.e. how to maintain the chaotic motion and how to obtain chaos under small amplitude in the VIS, which arise from the practical implements of the chaotifying technique for line spectra reduction, the tacking control method was proposed. It make the VIS track a knowed chaotic system, in this way, the line spectra in the radiated noise can be reduced effectively. In the mean time the problom of founding the knowed chaos sytem was solved. The experimental results confirmed the effectiveness of this method.

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spectra reduction / vibration isolation system / tracking control / chaos / nonlinear vibration

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ZHANG Zhen-hai; ZHU Shi-jian;LOU Jin-jun`. Line spectra reduction of vibration isolation system based on tracking chaotification method[J]. Journal of Vibration and Shock, 2011, 30(7): 40-44