Continuous Time T-S Multidimensional Dynamic Fault Tree Analysis Method And Hydraulic Reliability Application

Fault tree analysis is a powerful method for system reliability analysis.Dugan dynamic fault tree can describe existing static and dynamic failure behaviors,but it needs other methods for quantitative analysis.TS dynamic fault tree solves the problem of Dugan dynamic fault tree,but can not describe the continuous change trend of system reliability.In addition,only considering the single factor impact on system reliability has limitations in analyzing complex reliability issues.For example,hydraulic system reliability is often affected by many factors.Aiming at the above problems,considering the system reliability characteristics under the influence of continuous time and multiple factors,a continuous time T-S multi-dimensional dynamic fault tree analysis method is proposed.Firstly,by introducing sequential rules,T-S dynamic fault tree model can describe continuous dynamic logic relations.On this basis,the continuous time T-S dynamic fault tree model and its construction method are defined and given,then the multi-dimensional algorithm of continuous time T-S dynamic gate rule is defined on the basis of considering that basic events are affected by many factors.According to the defined model and algorithm,the continuous time T-S multi-dimensional dynamic fault tree analysis method is proposed.Compared with Dugan dynamic fault tree and discrete time T-S dynamic fault tree,the validity and advantages of continuous time T-S multi-dimensional dynamic fault tree analysis method are verified.Then,we draw on the connotation and extension of the importance of traditional fault tree and discrete time T-S dynamic fault tree.Considering that the basic events are affected by many factors,the continuous-time T-S multidimensional dynamic fault tree importance analysis method,the continuous-time multidimensional probability importance and multidimensional key importance calculation method are proposed.The feasibility of continuous-time T-S multi-dimensional dynamic fault tree importance analysis method is verified by comparing numerical examples with traditional fault tree importance analysis method and discrete-time T-S dynamic fault tree analysis method.The advantages of this method are demonstrated by hydraulic examples.Finally,based on the continuous time T-S multi-dimensional dynamic fault tree and its multi-dimensional importance analysis method,the reliability model of hydraulic system of concrete pump truck is established and analyzed.Constructing continuous time T-S dynamic fault tree model for Hydraulic System of Concrete Pump Truck.Considering the two-dimensional characteristics of hydraulic system affected by impact and working time.The two-dimensional probability distribution of faults and the two-dimensional importance distribution of basic events are calculated and analyzed.It provides a basis for detecting and improving the weak links in the system.