Optimal Selection of Tests for Fault Diagnosis in Multi-Path System with Time-delay

Abstract

Test selection is an important process to simplify the system structure and build a diagnostic system. Test selection problem in a multi-path system with time delay is investigated in this paper. The fault detection rate (FDR) and fault isolation rate (FIR) of the multi-path system are introduced. A heuristic function is then established to evaluate the uncertainty of the test, which can provide heuristic information to improve searching efficiency of the algorithm. An improved heuristic SSO algorithm GSSO is proposed to solve the test selection problem. The grey system theory is introduced into GSSO to improve the effect of optimization. The GSSO is compared with DPSO and SSO algorithms, and shows that the characteristics of jumping out of the local optimal solution earlier and faster convergence speed.