Reliability analysis of hydraulic steering system with DICLFL considering shutdown correlation based on GO methodology

GO methodology is a success-oriented method for system reliability analysis. There is Dual Input Closed-Loop Feedback Link (DICLFL) considering shutdown correlation in many repairable systems. It is a problem to use the existing GO method to make reliability analysis of such repairable systems. A new GO operator, named type 9C operator, is created to describe the DICLFL considering shutdown correlation, whose number is 1 in this paper. And its steady state probability quantification formulas are derived based on Markov process theory. Then the new method is adopted to conduct the reliability analysis of a hydraulic steering system of a Power-Shift Steering Transmission for the first time. Firstly, the success rule of hydraulic steering system is defined according to system analysis. Secondly, the operator type and reliability parameters of each component are determined through system analysis. Thirdly, GO model of the system is built. Then, success probability of the system is calculated by the exact algorithm with shared signals. And all system minimum cut sets are obtained by GO method. Finally, compared with Fault Tree Analysis and Monte Carlo simulation, the results show that this new GO method is correct and suitable for reliability analysis of repairable systems with the DICLFL considering shutdown correlation. It is more advantageous in the aspects of system model building and quantitative analysis. Moreover, this paper provides guidance for reliability analysis of repairable system with DICLFL considering shutdown correlation.