【作者】 许彬彬； 杨兆军； 陈菲； 王中；

【Author】 XU Binbin;WANG Zhong;YANG Zhaojun;CHEN Fei;College of mechanical science and engineering Jin University;

【机构】 吉林大学机械科学与工程学院；

【摘要】 采用传统"修复如新"或"修复如旧"的方法对可修复产品一数控机床进行可靠性建模时,与工程实际相比存在一定的偏差。针对这一问题,本文对可修复产品数控机床子系统,提出了一种考虑维修程度的数控机床子系统可靠性模型,该方法可建立"不完全修复"条件下的可靠性模型,结合Kijima I模型的役龄回复因子,对传统可靠性模型进行了改进,提出了包含早期和偶然故障期的可靠性模型,并给出了模型参数的似然估计求解方法。实例应用表明,该模型可以得到数控机床子系统早期故障期和偶然期的临界值以及运行期间的维修程度,能够为可靠性及维修性设计提供参考和依据。更多还原

【Abstract】 The traditional reliability models of CNC machine tools are based on the assumption that the machine after repair is as-good-as-new or as-bad-as-new.But it is not the precise model compared with the Engineering practice.This article focuses on the repair degree to the sub-system of CNC machine tools,and the reliability modeling method was proposed based on imcomplete repair cicumstances,considering the maintenance degrees.Meanwhile,the model’s parameters are calculated using the method integrating maximum likelihood method.Genetic algorithm is used in the solving process.The model is applied to actual data,the results shows that:this model can get the maintenance degrees which reflecting the real states of each sub-system’s changes and the intersection of the different failure-periods.It can be the references and basises for the design of reliability and maintainability,and the critical values of early-failures periods and random-failures period.更多还原