风机维修平台用齿轮齿条机构的动力学分析方法

Dynamical Analysis and Research on the Wind Turbine Internal Maintenance Platform Driven by Gear and Rack Mechanism

目的对所设计的风机内部维修平台的齿轮齿条运行机构的平台进行动力学分析,解决风机维护问题.方法利用三维绘图软件Solid Works建立了齿轮齿条的三维实体模型,在Ansys Workbench中建立了有限元模型,利用瞬态动力学模块分析风载大小的变化对平台运行机构的影响.结果通过对平台运行机构在强风,高空的工作环境下的有限元分析和电机突然启制动对齿轮齿条的瞬态动力学分析,得出风机内部维修平台运行机构在风机特定工况下,接触应力随时间变化的仿真曲线.齿轮齿条的最大接触应力在144.9~146.5 MPa波动,并在约0.2s以后稳定在145.7 MPa,符合所选取齿轮齿条材料的许用应力要求.结论平台齿轮齿条运行机构在选定的特殊工况下都能安全工作,当风场风速与所吊重物尺寸存在指定关系时可以进行吊装作业,所选取的运行机构的结构形式也为同类风机内部维修平台的设计与优化提供参考.

To solve the problem of wind turbine maintenance, dynamical analysis of a designedwind turbine internal maintenance platform driven by gear and rack mechanism was carried out. Using three-dimensional graphics software SolidWorks, a 3D model of the rack and pinion was built, and the corresponding FE model was established on the ANSIS Workbench. Effects of wind loads on the platform were analyzed using the transient dynamical module. Through finite element analysis of the platform in the case of both strong wind and high altitude work environment and transient dynamical analysis of rack and pinio by motor sudden starting or braking, simulation curves of contact stresses of the wind turbine maintenance mechanism in specific conditions were obtained. It is found that the maximum contact stress of the rack and pinion fluctuates between 144. 9 - 146.5 MPa, and then stabilizes in 145.7 MPa at 0. 2s later. This value satisfies the requirement of allowable stress for the selected material of the rack and pinion. Conclusion is that the platform rack and pinion mechanism can be safe to run in selected special conditions. Lifting operation can be carried out, if there is the specified relationship between the wind velocity and the lifting size. The selected mechanism for similar fan design and optimization of internal service platform provides a reference.