摘要
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。
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,and hence it is of great significance to reduce the line spectra for improving the acoustic stealth of marine vessels.Here,an anticontrol of chaos method based on chaotification was proposed for a vibration isolation system(VIS)of an on board machinery to produce the chaotic motion persistently.In this way,the line spectra in the radiated noise could be reduced effectively because the response spectrum of a chaotic system under harmonic excitations was a continuous and reduced one.Numerical simulations were carried out and the results verified the effectiveness of this method.
出处
《振动与冲击》
EI
CSCD
北大核心
2010年第10期50-52,126,共4页
Journal of Vibration and Shock
基金
国家自然科学基金(50675220)
关键词
线谱
隔振
混沌
非线性振动
spectra reduction
vibration isolation system
chaos
nonlinear vibration
