基于热分析的发电机转子非概率可靠性分析

Non-probabilistic Reliability Analysis of Generator Rotor Based on Thermal Analysis

发电机的整体性能与转子的可靠性和耐久性水平密切相关。针对实际参数通常为区间变量的问题,本文基于区间不确定性理论,建立稳态温度场的区间有限元分析模型,并提出区间可靠性分析方法。本文以发电机主转子为例,分析了其内部生热以及散热机制,通过区间有限元方法分析求解得到发电机稳定运行时主转子的三维温度场的区间响应,并以此为基础,建立相应的极限状态函数,进行区间可靠性以及灵敏度分析。试验结果表明,温度场最高值变化范围与试验结果基本一致,并且满足可靠性要求,证明该方法具有可行性和实用性。

The performance of the generator is closely related to the reliability and durability of the rotor.For the problem that the actual parameters are usually interval variables,based on the interval uncertainty theory,an interval finite element analysis model of the steady-state temperature field is established,and an interval reliability analysis method is proposed.In this paper,taking the main rotor of the generator as an example,the internal heat generation and heat dissipation mechanisms are analyzed.The interval response of the main rotor’s three-dimensional temperature field during stable operation of the generator is calculated by the interval finite element method.Then the corresponding limit state function is established and the interval reliability and sensitivity are analyzed.The experimental results show that the range of the maximum value of the temperature field is basically consistent with the test results and meet the reliability requirements,which proves that the method is feasible and practical.