变环境变工作条件下电子系统的可靠性评价方法

Reliability evaluation method of electronic system under variable environments and working conditions

为对变环境变工作条件下电子系统的可靠性进行有效评价,提出一种基于受控赋时混合随机Petri网(CTHSPN)的电子系统可靠性评价方法。首先,在混合随机Petri网的基础上将库所标识扩展到云域并与时间关联、引入控制函数和控制时钟,提出CTHSPN模型;其次,根据CTHSPN模型的建模机制建立电子产品的可靠性模型;最后,在产品可靠性模型的基础上,根据电子系统的失效机制和部件间的动态关系建立系统的可靠性模型,并通过Monte Carlo模型仿真计算出系统可靠度。实例分析表明:该方法能较好地体现温度、电压等工作条件对电子系统可靠性的独立性影响作用,为变环境变工作条件下电子系统的可靠性评价提供一条有效的途径。

To study the influence of the variation of environments and working conditions on the reliability of electronic system, a system reliability evaluation method based on controlled time hybrid stochastic Petri net （CTHSPN） was proposed. Firstly, by extending the place＇s field to cloud field and associating it with time, inducing control function and control clock on the basis of hybrid stochastic Petri net, CTHSPN model was proposed. Secondly, the component＇s reliability model based on CTHSPN was established. Finally, the system＇s reliability model was established according to system＇s failure mechanism and components＇ dynamic relationship, and the system＇s reliability was calculated by Monte Carlo method. The given example shows that the proposed method well reflects the working conditions＇ independent influence on the system＇s reliability, and provides an effective way to evaluate the reliability of electronic system under variable environments and variable working conditions.