柔性基础混沌化线谱控制技术研究

船舶辐射水声中的线谱成分是被动声纳在水声对抗中检测、跟踪和识别目标的主要特征信号，对线谱成分进行控制能有效提高船舶的水声隐声性能。传统的隔振方法无法改变隔振系统的线谱成份，利用反馈混沌化控制原理，采用时变反馈参数的离散混沌化方法，通过调整和优化控制器参数，使基于柔性基础的隔振系统在谐波激励下能够产生稳定的混沌，改变通过隔振系统输入到船体的频谱结构，从而改变船舶辐射水声的频谱结构，并降低辐射水声中的线谱成分，达到有效降低辐射水声线谱成分的目的。

Linear Spectra Reduction of Flexible Base Vibration Isolation System Based on Chaotification Method

Linear spectra in the radiation noise of marine vessels are the main characteristic signals which can be detected,tracked and identified by enemy＇s passive sonar.Hence,reduction of the linear spectra can effectively improve the acoustic stealth of marine vessels.However,traditional isolation methods can not remove the linear spectra components in the vibration isolation systems（VIS） of on-board machinery.In this paper,a feedback chaotification method is proposed for reduction of the linear spectra.The method of separation and chaotification of the feedback parameters is used.Through adjusting and optimizing the controller＇s parameters,the VIS of the flexible base can yield steady chaos under harmonic excitation.This steady chaos can alter the structure of the frequency spectra transmitted from the VIS to the vessel.So,the frequency spectrum structure of the radiation noise of the vessel is also changed.In this way,the linear spectra in the radiated noise can be reduced effectively.Numerical simulations are carried out and the results confirm the effectiveness of this method.