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针对将置于塔顶机舱的大型增速箱及发电机部分装置放置在地面和高效利用风能的问题, 提出一种新型双风轮风力发电机组合成增速箱的设计方案, 利用虚拟样机技术建立该双风轮合成增速箱的三维模型, 并运用Romax Designer仿真软件, 在模拟随机载荷工况下对该双风轮合成增速箱进行了仿真, 仿真结果与理论计算值基本吻合, 依据仿真结果对某些部件进行优化设计, 说明了虚拟样机模型构建的合理性.该方法极大缩短了齿轮增速箱的设计周期, 可提高产品设计质量及降低设计费用.“,”Aming at the problem that the large speed-increasing gearbox and parts of the generator originally in the tower are placed on the ground and wind energy is utilized efficiently, a new design scheme about the speed-increasing gearbox for wind turbine with double rotors was presented. The 3-D model of this new speed-increasing gearbox was built by the virtual prototype technology. It was simulated by simulation software Romax Designer under the conditions of simulation random load. The simulation results basically coincide with the theoretical calculation. The optimization design of some parts have been carried out according to the simulation results, it proved that the 3-D model built by the virtual prototype technology is reasonable. The design period of the speed-increasing gearbox would be shortened greatly, design quality of products would be improved, and the cost of design would be reduced with this method.