中文摘要：

根据预防性可修复系统的特点，利用离散可修复模型来分析预防性维修下的系统效能．通过对单部件可修系统状态转移方程的分析，获得了考虑预防性修复策略下的系统可信赖度D．通过对系统可用度A、可信赖度D和能力C的综合，可以获得预防性维修下的系统效能评价．数值算例说明了该评估模型有助于选择合适的预防性修复周期，提高系统的效能．

英文摘要：

For the repairable system with preventive maintenance, this article uses the discrete-time repairable model to discuss the system effectiveness with preventive maintenance. By analyzing the state transition equation of a singlecomponent repairable system, we derive the dependability D with preventive maintenance. The effectiveness-evaluation model of the system with preventive maintenance is obtained by integrating the availability A, the dependability D and the capacity C. Numerical examples illustrate that this effectiveness-evaluation model with preventive maintenance is advantageous for selecting the appropriate preventive repair-cycle to improve the system performance.