面向维护的矿山机电系统服役年龄动态仿真与近似建模

基于机械系统中零件的失效时间分布密度函数，建立了面向维护的矿山机电系统服役年龄模型，探讨了零件失效时间分布参数对系统服役年龄的影响规律，给出了系统服役年龄近似数学模型.理论分析与仿真结果表明：系统服役年龄变化是一个从振荡趋于稳定的过程，可以用二阶系统的时间响应函数来描述；系统服役年龄的变化周期近似于零件服役寿命的均值，稳定值近似于振幅的平均值；对于给定的维护周期和偏差，根据近似数学模型可以方便地计算出系统服役年龄的稳定值、振荡时间和振荡次数等特征值.

Modeling and simulation of service life of mining mechanical and electronic systems under going maintenance

Based on the time-to-failure density function of parts, the service life model of mining mechanical and electronic systems were constructed to track the change course of part service life for the systems that were reassembled and maintained. At last, the service life approximate mathematic model was defined. By means of theoretical study and simulation, it is indicated that the variation of the service life is a process from oscillating to stability. The process can be described by the time response of two order system. The variation cycle is about mean value of part service life, the stable value is about the average of the oscillation amplitude. The feature parameters, such as stable value, oscillating time and cycles of system service life can be calculated easily according to the approximate mathematic model for the maintain cycle and deviation given.