利用轨道稳定性的基本定义,根据Grillaks在Hamiltonian系统中证明的轨道稳定性的等价定理,研究一个杆方程ut-uxxt+3u^mux=γ(2uxuxx+uuxxx)孤立波的轨道稳定性问题.在Hamiltonian可积系统中利用方程的两个守恒量讨论满足定理的四个条件,且找到一个适当的刘维尔变换,并将其转化为保持一定本质谱和特征值性质的形式.从而得到此方程孤立波轨道稳定性的证明.
A rod equation with conserved quantities : ux - uxxt + 3u^mux = γ( 2uxuxx + uuxxx ) and the orbital stability waves in this equation are studied. Firstly, the basic definition of the orbital stability is given. By transforming the rod equation into a corresponding Hamihonian system, one can obtain four equivalent cases and validate these cases one by one. The difficulty is the fourth case. To satisfy this problem, a propriate Liouville transformation is chosen so that some properties come into existence. The orbital stability of solitary waves of this rod equation is proved.