中文摘要：

为了研究高速列车齿轮传动系统动态特性,内部激励考虑齿轮的时变啮合刚度和传递误差,扭矩波动表示输入端激励,负载端激励考虑由黏滑振动引起的负载波动.利用有限元方法得到高速列车齿轮系统时变啮合刚度,考虑齿轮啮合误差,并用傅里叶级数展开.结合非线性多尺度近似解析方法,利用单自由度扭转模型分析动态激励对系统振动的影响,同时建立考虑齿轮啮合的高速列车动力车整车动力学模型.研究表明：齿轮传动系统中存在谐波振动,扭矩波动不仅会增大轮齿的角加速度和啮合力,同时使齿轮箱的振动加剧,并改变系统的振动主频,可能引发共振.黏滑振动将使齿轮系统的各项指标急剧增大,严重影响齿轮的啮合平稳性,在实际运营中应尽量避免.

英文摘要：

In order to study the dynamic characteristics of the gear transmission system of high-speed train,a dynamic model of the gear system subjected to internal and external excitations was developed.The internal excitations included the time-varying stiffness and transmission errors,the external excitations included the harmonic torques at the source end and the torque fluctuations caused by stick-slip vibrations at the load end.Time-varying mesh stiffness of meshing teeth pairs was calculated through finite element analysis.The mesh stiffness and transmission error were expressed using the technique of Fourier series expansion.The theory of the non-linear multiple scales method was used to analyze the harmonic characteristics according to the single degree of freedom equation of torsional vibrations.The multi-body dynamics model of motor car including the driving system was established,and the force and moments generated in the gear mesh were considered.The results show as follows：The torque fluctuation increases the angular acceleration and meshing force of gear,intensifies the vibration of gearbox,and also changes the main vibration frequency,thus initiating resonance; stick-slip oscillations cause all performance indexes of gearbox to rise dramatically and affect gear mesh stability seriously,this should be avoided in operation as far as possible.