中文摘要：

用Lie群方法研究汽车车体振动系统的对称性，寻找其存在的守恒量．以汽车车体做上下垂直振动和绕其质心的前后俯仰振动，采用Lagrange甬数的方法，构建汽车车体振动系统．以此系统为对象，引入Lie群方法，给}H该振动系统的Noether对称性理论与Lie对称性理论；由此推导该汽车系统存在的Noether对称性与Lie对称性，并得到系统相应的的守恒量．该方法对车体振动问题提出了新的对称性解法，同时扩大了Lie群方法的应用范围．

英文摘要：

Symmetries and conserved quantities of vehicle body vibration systems were studied with the Lie group method. The vertical translational vibration and the pitching vibration around the mass center were addressed by means of the Lagrangian functions to construct the vehicle body vibration model. According to this vibration system, the Noether symmetry theory and the Lie symmetry theory were derived via the introduction of the Lie group method, The existence of the Noether symmetries and the Lie symmetries of the system were proved with the corre- sponding conserved quantities obtained. This work provides a new symmetry solution to the ve-hicle body vibration problem, and meanwhile expands the application scope of the Lie group method.