| Citation: | ZHOU Liang, LI Qingmin, PENG Yingwu, et al. Applicability of steady-state availability model and unsteady-state time-varying availability model[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(12): 2422-2430. doi: 10.13700/j.bh.1001-5965.2016.0872(in Chinese)
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Aimed at whether the steady-state availability model of METRIC model can be directly applied to the unsteady-state time-varying availability model, by extending the METRIC theory, a time-varying availability model based on the expected order of spare parts and a time-varying availability model based on the expected back order and variance of spare parts have been built. In the case that the system reaches steady state (repair probability is 1) and is in unstable state (repair probability is less than 1), two time-varying availability models are used to calculate the availability of voting structural unit and serial structural unit, and the results are compared with Monte Carlo simulation model. The results show that:when the equipment structure is a series relation and the system is stable, the time-varying availability model based on the expected number of spare parts is consistent with the simulation model, and it is suitable for the calculation of spare parts configuration optimization in the whole life cycle of the equipment; the model of time-varying availability, which is based on the expected order and variance of spare parts, is suitable for the optimization calculation of the spare parts configuration of the combat unit, regardless of the steady state and unsteady state of the support system.
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