机构地区: 东莞理工学院
出 处: 《物理学报》 2004年第6期1940-1945,共6页
摘 要: 在位错动力学的Seeger方程基础上 ,引入周期场作用 ,把位错运动方程化为具有硬弹簧特性的Duffing方程 ,并利用多尺度法分析了系统的动力学特征 ,利用Melnikov方法讨论了系统的全局分叉和系统进入混沌状态的可能途径 .结果表明 ,当δ α一定 ,Ω不断减小时 ,系统逐渐向临界状态接近 。 An external periodic field has been introduced in the Seeger equation; a motion equation of a crystal dislocation has been induced to Duffing function with the hard—spring properties.A global bifurcation of the system and a probable way into the chaos have been discussed by using Melnikov methoud. It shows that the system enters into the critical state , then enters the chaos by the cascading bifurcation, if δ/α is defined and Ω is reduced continuously.