Department;
of;
computation;
Science,;
Chengdu;
University;
of;
Information;
Teehnologv,;
Chengdu;
610225,China;
Department;
of;
Mathematics,;
Southwest;
Jiaotong;
University,;
Chengdu;
610031,;
China;
非线性四阶波动方程; 整体解; 存在性; Galerkin法;