摘要
分析大型风机液力变桨系统的失效特性,基于三参数Weibull分布函数拟合可靠性衰变规律,通过建立极大似然方程组对函数参数逐一求解。采用遗传算法优化求解过程,并在遗传算法种群迭代过程中动态修正个体的交叉及变异概率,以解决适应度发散的问题。结合实际数据,计算得出大型风机液力变桨系统的三参数Weibull分布可靠性函数,并将其与二参数Weibull分布拟合结果进行对比。结果表明,基于三参数Weibull分布的时变失效率估算结果的适应性更高,避免了在失效初始阶段的不合理估计,能够更好地模拟大型风机液力变桨系统的失效特点。
Based on the brief analysis of the failure characteristics of the large-scale wind turbine hydraulic pitch system,the reliability decay law is fitted by three-parameter Weibull distribution function.And the function parameters are solved by establishing a maximum likelihood equation set.At the same time,the genetic algorithm is used to optimize the solution process.The individual crossover and mutation probability are dynamically modified during the genetic algorithm population iteration process,so as to solve the problem of fitness divergence.Combined with the actual data,the three-parameter Weibull distribution reliability function of the large-scale wind turbine hydraulic pitch system is calculated.Thereafter,it is compared with the two-parameter Weibull distribution fitting results.The results show that the time-varying failure rate estimation results based on the three-parameter Weibull distribution are more adaptable.It avoids unreasonable estimation at the initial stage of failure,and can better simulate the failure characteristics of large-scale wind turbine hydraulic pitch systems.
作者
崔策
石新发
贺石中
李秋秋
康鑫硕
CUI Ce;SHI Xin-fa;HE Shi-zhong;LI Qiu-qiu;KANG Xin-shuo(Equipment Lubrication and Testing Research Institute,Guangzhou Mechanical Engineering Research Institute Co.,Ltd.,Guangzhou,Guangdong 510700)
出处
《液压与气动》
北大核心
2020年第12期8-13,共6页
Chinese Hydraulics & Pneumatics
基金
国家重点研发计划(2018YFB2001604)
广州市黄埔区国际科技合作项目(2018GH12)
国机智能青年基金(173000058)。
关键词
润滑系统
可靠性
遗传算法
WEIBULL分布
极大似然法
lubrication system
reliability
genetic algorithm
weibull distribution
maximum likelihood method
作者简介
崔策(1991—),男,广东广州人,工程师,硕士,主要从事油液监测技术方面的科研工作。
