高速铁路联调联试系统可靠性分析方法的研究

Research on the Reliability Analysis Method of the Testing and Commissioning System for High-Speed Railway

根据高速铁路系统组成,将高速铁路联调联试系统划分为6个子系统。基于工程控制理论,高速铁路联调联试系统结构采用多级层次结构和多级协调结构形式,建立用多变量动态方程组描述的数学模型。应用马尔可夫(Markov)过程分析高速铁路联调联试系统可靠性方法是:考虑子系统的独立性时,首先推导出首次系统平均失效时间计算公式,并采用可用度、失效频率和失效平均间隔时间参数评估子系统的稳态,然后用稳态概率描述系统的可靠性;考虑子系统间的关联性时,首先引入关联变量,将关联的子系统简化成串联或并联结构,然后对系统可靠性的边界条件进行评估。

According to the system composition of high-speed railway, the testing and commissioning system for high-speed railway is divided into 6 subsystems. Based on engineering control theory, multi- level hierarchical structure and multi-level coordination structure are adopted for the testing and commissioning system structure of high-speed railway. The mathematical model described by multivariable dynamic equations has been constructed. Markov process is applied to analyze the reliability of the testing and commissioning system for high-speed railway. Considering the independence of the subsystems, the formula for calculating the first system mean time to failure （MTTF） is deduced, and the steady state of the subsystems is evaluated by such parameters as the availability, failure frequency and mean time to failure. Then the steady state probability is used to describe system reliability. Considering the relevance of the subsystems, the relevance variable is first introduced, and the relevant subsystems are simplified into series or parallel structures. Then the boundary conditions of system reliability are evaluated.