多源激励及多因素相关的风电传动系统动态可靠性及疲劳寿命研究

项目名称： 多源激励及多因素相关的风电传动系统动态可靠性及疲劳寿命研究

项目编号： No.51305126

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 机械、仪表工业

项目作者： 周志刚

作者单位： 河南科技大学

项目金额： 25万元

中文摘要： 针对风力发电机变工况和整机高柔性的特点以及传动系统承受多源复杂激励、失效率高等问题，将由随机风速变化引起的作用在风轮上的随机风载荷、塔架和机舱振动引起的动载荷以及电网冲击引起的动载荷引入传动系统，研究各激励源之间的耦合关系及对传动系统动态性能及疲劳寿命的映射关系。在此基础上，建立多激励源条件下的传动系统非线性动力学模型，研究多激励源耦合作用对传动系统各轮齿和轴承的非线性振动响应及实际载荷历程的影响。采用随机过程理论描述疲劳载荷、极端载荷及强度退化的随机行为，引入Copula 理论描述传动系统失效过程的相关性，揭示系统整体性能与各独立元件性能之间的统计学关系，建立多源激励载荷共存环境下多因素相关的传动系统动态可靠性及疲劳寿命模型。形成多源激励及多层次相关的风电齿轮传动系统动态可靠性及疲劳寿命设计理论与方法，为建立和完善我国风电齿轮传动系统的动态可靠性评估及疲劳寿命预测理论与方法提供有效途径。

中文关键词： 风力发电机；齿轮传动系统；动态可靠性；失效相关；疲劳寿命

英文摘要： Aiming at the characteristics of the varying working condition and the high flexibility of wind turbines and the problems of high-failure rate of gear transmission system under the condition of multiple-source excitation，the random wind load acting on the wind rotor incited by random wind speed changing，the dynamic load caused by vibration of tower and nacelle，and the dynamic load caused by power grid impact are imported the transmission system of wind turbines，the coupling relationship between the multiple excitation sources and the mapping relationships between the each excitation sources and dynamic performance and fatigue life will be researched. On that basis，the non-linear dynamics model will be established under the multiple source excitations，and the influence of multiple excitation sources coupling effect on non-linear vibration response and the actual loading history of each gear and each bearing of transmission system will be researched. The random processes theory will be adopted to describe the random behavior of the fatigue load，the extreme load and the strength degradation，the Copula theory will be introduced to describe the failure-dependence of transmission system，the statistical relationships between the whole performance and the each independent element degradation will be revealed，and the dyn

英文关键词： wind turbine；gear transmission；dynamic reliability；failure dependence；fatigue life