Comprehensive Reliability Evaluation Method for Complex Systems Considering Operational Profiles
In the reliability assessment of complex systems,the running time and fault data of the entire system are often collected,and reliability statistical analysis methods are applied to provide reliability index evaluation results.However,the running data of the entire system is extremely scarce,and it is difficult to achieve effective reliability evaluation.In addition,system reliability is closely related to the running profile,and the reliability characteristics under different task profiles have significant differences.Therefore,if the running profile information at all levels of the system can be effectively utilized,the accuracy of system reliability assessment can be further improved.In order to fully utilize the reliability information accumulated at various levels of experimental data in complex systems and improve the effectiveness of complex system reliability evaluation,a comprehensive reliability evaluation method for complex systems that considers operational profile information is established.Based on the environmental stress profile and operating condition profile,equivalent test data at different levels under different operating profiles are obtained.On the basis of utilizing equipment operating time and fault frequency information,the operating profile information is further utilized.Based on the basic reliability model of the system,the equivalent reliability information of the equipment is fused and converted to obtain the equivalent test data of the entire system.Finally,based on the actual task profile of the system,comprehensive reliability evaluation results under different operating profiles are provided.
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