针对随机风作用下风力发电机齿轮传动系统失效率高的问题,研究了随机风引起的风力发电机传动系统外部风载荷以及内部由齿轮、轴承刚度及综合啮合误差等引起的内部动载荷激励,基于集中质量法建立了风电齿轮传动系统齿轮-轴承耦合动力学模型。在对模型进行仿真求解的基础上,分别求得了传动系统中各齿轮和轴承的动态接触应力-时间历程。将载荷作用过程视为随机过程,推导出随机载荷作用下的等效载荷累计分布函数,从系统层面上建立了基于应力-强度干涉理论的风力发电机齿轮传动系统动态时变可靠性模型, 模型考虑了零件的失效相关性和强度退化因素,研究了失效相关性和强度退化对风电齿轮传动系统可靠度和失效率的影响规律,为风力发电机齿轮传动系统动态设计和可靠性优化设计奠定了基础。
For the high failure rate of gear transmission system of wind turbine under the random wind conditions, the external wind load of gear transmission system of wind turbine induced by random wind and the internal dynamic loads induced by the stiffness of rolling element bearing and the gear and the synthesizing gear mesh error are researched,the lumped mass method is used to establish the coupled gear-bearing dynamics model of gear transmission system of wind turbine. The dynamic contact stress-time history of each pair of gears and each supporting bearing are obtained on the basis of the simulation. The loading process is taken as a random process, and the cumulative distribution function of the equivalent load of random load is deduced. The dynamic and time-varying reliability model of gear transmission system of wind turbine is built on the system level based on the stress-strength interference theory. The factors of strength degradation and dependent failure are included the model and the rule for the impact of the strength degradation and dependent Failure on the dynamic reliability of gear transmission system of wind turbine is researched. The research results lay a foundation for dynamic design and optimal reliability design of gear transmission system of wind turbine.
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