基于代价组合优化的故障诊断序贯测试策略研究

Research on Sequencing Test Strategy for Fault Diagnosis Based on Combinational Optimization of Cost

提出了一种故障诊断序贯测试策略设计思想。该设计思想以组合优化技术为基础,采用序贯测试方法;通过测试与故障源之间的关系将系统分为一般序贯系统和并行系统。分别对其期望测试代价,诊断策略算法等关键技术进行研究。提出一种序贯故障诊断测试组合优化策略,引入代价权重因子ρ,实现了测试时间和成本的组合优化。对并行系统诊断测试搜索启发式引入调整权重因子μ实现了测试时间和成本、故障源故障发生概率的折中优化,有效地提高了诊断的可靠性,灵活性和实用性。最后通过抽象实例进行验证,结果表明基于组合代价优化的故障诊断序贯测试策略进行故障诊断测试是实用的,也是有效的。

The design thinking of sequencing test strategy for fault diagnosis is presented.The combinational optimization technology is used in the thinking,utilizing sequencing test method.A UUT is divided into the sequencing system and parallel system according to the dependency of fault source and test,studied the key technology such as expected test cost,diagnosis testing algorithm.A sequencing fault diagnosis test combinational optimal strategy,which introduces a factor ρ to balance the concern of time vs.the concern of cost,is put forward,and the heuristics introduce a weight factor μ to balance concerns on uncertainty about the estimated probability p and utility ω.The diagnosis＇ reliability,flexibility and practicability are greatly enhanced.According to an illustration,it is proved that the test strategy does to be practical,and effective.