基于边界辨识的水下航行器低频线谱主动调控

项目名称： 基于边界辨识的水下航行器低频线谱主动调控

项目编号： No.61503354

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 自动化技术、计算机技术

项目作者： 董万静

作者单位： 华中农业大学

项目金额： 21万元

中文摘要： 声纹是声纳对水下航行器进行探测和识别的主要依据。利用非线性隔振系统进入不稳定振动状态时其响应频谱发生突变这一特点，可以改变机械设备传递到船体的线谱特征，从而改变水下航行器的声纹，提高其声隐身性能。本项目将研究利用非线性隔振系统改变水下航行器声纹特征的方法，重点关注非线性隔振系统在分岔临界状态的动力学特性，探索非线性隔振系统改变低频线谱的物理机理。利用非线性动力学工具分析隔振系统自身参数及扰动信号参数与其隔振性能之间的关系，通过考虑各参数对系统输入/输出动力学的影响，建立非线性隔振系统稳定/不稳定边界的辨识方法，研究非线性隔振系统稳定/不稳定工作状态的主动控制方法，为水下航行器的声纹改变技术提供理论指导。同时，针对与非线性隔振系统相关的一类非线性系统，探索其临界状态辨识及主动控制的一般性方法。

中文关键词： 非线性系统动力学；振动控制；Hopf；分岔；主动控制；系统辨识

英文摘要： Voice print is one of the most important tools that sonar detects and identifies vessels. Nonlinear vibration isolation systems alter the output spectrum shape as operating in unstable vibration station, which can be applied to the modification of spectral lines of the vibrations of the ship body induced by the onboard mechanical equipment. This project tries to develop method of modifying characteristics of ship voice print through employing nonlinear vibration isolation system and pays special attention to system dynamics at critical state as system changes stabilities, from stable to unstable, or vice versa...In this project, physical mechanism of nonlinear vibration isolation systems to alter structure of voice print of vessels will be investigated through analyzing effects of parameters, including bifurcation parameters and perturbation parameters, as well as system parameters, on system dynamics of nonlinear vibration isolation system model, and then finding out methods of predicting the stable boundary of nonlinear system. On the basis of the above analysis results，active control strategies are built to keep/change operating conditions. Finally,the performance evaluation of the control method which presents ability of nonlinear vibration system to change line spectrumsis considered...It is expected that results gotten in this project can give guidance to techniques of altering vessels voice print. Meanwhile, a general method to identification of the critical condition and active control of nonlinear systems associated with nonlinear vibration isolation system are attempted to be developed.

英文关键词： Nonlinear system dynamics;vibration control;Hopf bifurcation;active control;system identification