Reliability Analysis Of Unrepairable Engineering System Considering Failure Dependence

With the massive development of metropolis, the reliability of the lifeline system that metropolis relies on increasingly becomes the topic that people concern. How to objectively evaluate systematic reliability? According to the theory of independent hypothesis, the computed result is usually either optimistic or conservative. As a matter of fact, any existent system or subsystem is affected at least by homo-random disturbance source. Therefore dependence is the universal character that any failed system bears. Dependent failure is that two or more than two units fail or are not able to be used because subsystems or units interfere with one another in space, environment and design aspects at the same time or during the specified time. In dissertation, two algorithms on systematic reliability analysis and the specific application of these two algorithms to different styles of systems are discussed in generalizedly environmental failure dependence level, including the following four facets:First, conditional dependence coefficient method that has been extensively applied to reliability analysis of engineering system is analyzed in detail. The problems that how the value of conditional dependence coefficient is chosen, that conditional dependence coefficient method do not meet communitativity on the probability of systematic units functioning or failing, that what relation reliability of series/parallel system has with conditional dependence coefficient and systematic size, are thoroughly discussed and solved.Second, the properties of the new model, Hamacher operator, applicable to systematic reliability analysis considering failure dependence, are reasoned at length. The dependent parameter of Hamacher operator is simulated by Monte carlo. The defect of Hamacher operator is definitely pointed out. In order to remove this drawback, Hamacher operator is modified. Similarly, the properties of modified Hamacher operator are reasoned in detail. The dependent parameter of modified Hamacher operator is simulated by Monte carlo in the same way.Next, the methods of gradual supplement of unit state and general term representation of state combination on reliability analysis are defined. These two concepts make the idea that the reliability analysis of voting system is finished by computer become realistic to some degree.Finally, modified Hamacher operator is applied to reliability analysis on series system, parallel system, voting system, network system and more complex system. The corresponding applied software based on modified Hamacher operator, which is applicable to above-mentioned systems, are compiled.