Virtual prototype model of the drive system of a wind turbine generator with a common gearbox of two-stage planetary and one-stage parallel shaft gear transmission was built. Based on the Hertz elastic contact theory, the formula of gear mesh stiffness was established. By means of the dynamics analysis software ADAMS, the dynamic performance of the gear meshing was simulated and the meshing force was obtained. Then, the rigid-flexible model of the transmission system with a flexible output-stage pinion was established, and the stress variation of the pinion was analyzed. It is shown that the method of using ADAMS for dynamic simulation and modeling of complicated gear transmission system is very effective. The simulation results can provide some useful reference for gearbox optimal design.%针对目前风电机组常见的两级行星轮系加一级平行轴传动的齿轮箱结构，建立其传动系统虚拟样机模型。基于Hertz弹性接触理论建立仿真齿轮啮合刚度计算公式；借助ADAMS动力学分析软件，对轮齿动态啮合力进行仿真，研究轮齿啮合力在齿轮转动过程中的变化规律；将输出级小齿轮柔性化，建立传动系统的刚柔耦合模型，分析仿真过程中输出级小齿轮的应力变化。利用ADAMS对复杂齿轮箱传动系统进行动力学建模与仿真取得很好的效果，为传动系统的动态设计及优化提供依据。
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