白噪声参激余维2分叉系统研究

为考查白噪声参激的具有非半简双零特征值的一类余维二分叉系统的样本稳定性并确定其首次分叉点的位置，本文使用Ｌ．Ａｒｎｏｌｄ的渐近分析方法研究了系统最大Ｌｙａｐｕｎｏｖ指数的渐近分析式．为进一步研究噪声对于此系统退化分叉的影响，本文将使用一维扩散过程的奇异边界理论，考查“隐藏在余维２分叉点之后”同宿分叉系统受参激白噪声影响的分叉行为．

ON CO-DIMENSION 2 BIFURCATION SYSTEM EXCITED PARAMETRICALLY BY WHITE NOISES

In this paper, in order to investigate the sample stability of a class of white noises parametrically excited co-dimension 2 bifurcation system which possesses non-semisimple double zero eigenvalues and then to fix the first bifurcation point, the approach of asymptotic analysis of L. Arnold is used to obtain the asymptotic expression of the maximum Lyapunov exponent of the relevant system. In addition, with the aid of the theory of singular boundary of one-dimensional diffusion process, a further research on the influence of noises upon the degenerate bifurcation of such system is made to study the bifurcation behaviors of the white noise parametrically excited homoclinic bifurcation system which is hidden behind the co-dimension 2 bifurcation point.