多自由度非线性随机系统的响应与稳定性  

RESPONSE AND STABILITY OF MULTI-DEGREE-OF-FREEDOM NONLINEAR STOCHASTIC SYSTEMS

作　　者：金肖玲[1] 王永[1] 黄志龙[1] 

机构地区：[1]浙江大学航空航天学院工程力学系,杭州310027

出　　处：《力学进展》2013年第1期56-62,共7页Advances in Mechanics

基　　金：国家自然科学基金(11025211;11002077;11202181);浙江省自然科学基金(Z6090125;LQ12A02001);高校博士点基金(20110101110050)资助项目~~

摘　　要：响应与稳定性分析一直是随机动力学研究的热点,发展预测随机响应及判定系统响应性态的方法具有重要的科学意义与广阔的应用前景.本文综述了有关多自由度非线性随机系统的响应与稳定性的研究.首先简介用于随机系统响应预测的Fokker–Planck–Kolmogorov方程法、随机平均法、等效线性化法、等效非线性系统法和MonteCarlo模拟法,评述其优缺点,进而讨论了多自由度非线性随机系统响应的精确平稳解、近似瞬态解的研究现状.然后介绍了随机系统稳定性分析的两类方法,即Lyapunov函数法及Lyapunov指数法,并综述了多自由度非线性随机系统稳定性分析的研究现状.最后给出几点发展建议.The response prediction and stability analysis are always hot topics of research in stochastic dynamics. Developing the method for response prediction of nonlinear stochastic systems and determining the qualitative behavior of the system response are of important significance and extensive application potential. This paper reviews response and stability of multi-degree-of-freedom nonlinear stochastic systems. Firstly, main methods for the response prediction of stochastic systems are outlined, such as Fokker-Planck-Kolmogorov equation, stochastic averaging method, equivalent linearization, equivalent nonlinear system procedure and Monte Carlo simulation. The advantages and disadvantages of these methods are discussed, respectively. The state-of-the-art of the exact stationary solutions and approximately nonstationary solutions is also illustrated for the multi-degree-of-freedom nonlinear stochastic systems. Then, two effective procedures to evaluate the stochastic stability, i.e., the Lyapunov function and Lyapunov exponent, are briefly presented. Based on these two methods, the stochastic stability of multi-degree-of-freedom nonlinear stochastic systems is outlined. Finally, some suggestions are given for further research on the response and stability of nonlinear stochastic systems.

关 键 词：多自由度非线性系统 随机响应 随机稳定性 随机平均法 Fokker—Planck—Kolmogorov方程 

分 类 号：O322[理学—一般力学与力学基础] O324[理学—力学]