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,混沌隔振技术利用隔振系统处于混沌状态时其响应功率谱呈连续谱这一特征来抑制动力机械对艇体的线谱激励。针对目前混沌隔振技术在工程实际应用中存在如何在小振幅条件下实现持续混沌运动的难题,提出了利用跟踪控制使隔振系统混沌化方法,抑制辐射水声中的线谱成分,同时解决了跟踪目标建立的难题,试验结果证明了该方法的有效性。
Line spectra in radiated noise of marine vessels are the main visible signals,they 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 chaotic motion and how to obtain chaos under small amplitude in a vibration isolation system（VIS）,arising from practical implements of the chaotifying technique for line spectra reduction,the tracking control method was proposed.It made the VIS track a known chaotic system,in this way,the line spectra in the radiated noise could be reduced effectively.Meanwhile,the problom to find the known chaos sytem was solved.The experimental results confirmed the effectiveness of this method.
出处
《振动与冲击》
EI
CSCD
北大核心
2011年第7期40-44,共5页
Journal of Vibration and Shock
基金
国家自然科学基金(50675220)
关键词
线谱
隔振
跟踪控制
混沌
非线性振动
spectra reduction
vibration isolation system（VIS）
tracking control
chaos
nonlinear vibration
