摘要
可用度是一种以比例或概率来衡量系统是否可以正常工作的参数,是衡量装备效能的重要指标。首先,以威布尔分布作为装备的失效密度函数,利用函数关系求出其期望函数;其次,在建立了似然函数后,用最大似然估计方法建立联合方程组,求出密度函数参数的估计值,该参数与装备的有效运行时间有关;第三,在可用度限定条件下,利用可用度函数求出装备的最佳预防置换维修周期及其维修次数;最后,以某装备为实例,在已知参数的条件下求出该装备的最优预防维修周期及其维修次数,证明了模型的有效性。
Availability is parameter to measure the proportion or probability of the system’ normal work ability, it’s an important factor to measure equipment performance. First, assume that the equipment failure density function obeying Weibull distribution, the expected function is calculated, which is the expected average life time of equipment. Second, the maximum likelihood estimation method is established to estimate the density function parameters. Third, the optimal preventive replacement maintenance of equipment and its repair cycle times are found out by using availability functions based on limited availability. Finally, the optimal preventive replacement maintenance and repair cycle times are obtained on the conditions of limited availability by taking certain equipment as an example, the results show the model is useful to equipment.
出处
《航空制造技术》
北大核心
2013年第1期134-136,143,共4页
Aeronautical Manufacturing Technology
基金
航空科学基金(2009ZG55018)资助
关键词
可用度
威布尔分布
定期预防维修置换
Availability
Weibull distribution
Periodic preventive maintenance
Replacement
