【作者】 曾强洪； 朱石坚； 楼京俊； 张星；

【Author】 Zeng Qianghong;Zhu Shijian;Lou Jinjun;Zhang Xing;

【机构】 海军工程大学船舶与动力学院；

【摘要】 线谱是潜艇辐射噪声谱中最显著的特征,即使在潜艇以低速航行、产生最低的噪声辐射的情况下也可以探测到。利用混沌的宽频特性来降低潜艇辐射噪声线谱,提高其隐身能力已被广泛研究,但由于混沌的内在不确定特性,当系统处于混沌状态时,整体隔振性能不能得到保证。提出应用滑模变结构控制实现隔振系统和混沌系统投影同步的新方法,从而解决了混沌隔振中消除线谱和保持隔振系统隔振性能之间矛盾的方法。该方法不用计算Lyapunov指数,且对参数失配具有很强的鲁棒性。通过对两自由度隔振系统和duffing方程的数值仿真,验证了该方法可成功消除线谱且明显改善隔振系统的隔振性能。更多还原

【Abstract】 Line spectra are the most visible signs of the submarines’ radiated noise spectrum since they may be detected even at low speeds,when submarines produce minimal noise.The potential of chaotifying vibration isolation systems to reduce line spectra of underwater vehicle and improve its capability of concealment have recently reported.Notice that for an isolation system,the amplitude of chaotifying vibration is,in general,larger than that of its specified periodic motion subject to the inherent characteristic of chaotic behavior.A new method based on the sliding mode control is advanced to realize the projective synchronization between the two-degree-of-freedom vibration isolation system and the chaotic system based on sliding mode control.The presented method can solve the conflict between the linear spectra reduction based on chaotifiying vibration responses and the capability of vibration isolation.The effectiveness of the proposed scheme is validated by the numerical simulation.The simulation results show that linear spectra is reduced and the vibration amplitudes of isolated equipment is proportionally diminish,moreover,this method need not calculate Lyapunov exponent and the proposed controller takes on strong robustness for parameter uncertainty and influence of measurement noise.更多还原