一类二阶非线性系统的周期解

On Periodic Solutions for Some Nonlinear Second Order Differential Equations

应用构造Ｌｉａｐｕｎｏｖ函数的方法，在限制条件较弱的情形下，研究了一类非线性系统周期解的存在性．

The existence of periodic solutions for some nonlinear second differential system under weaker conditions is discussed by using the method of Liapunov function.