Research on time-varying competitive failure of safety interlock system actuators with non-constant failure rate
The safety interlock system(SIS)plays an important role in preventing hazardous accidents in chemical plants.Due to the complex working environment,SIS actuators are inevitably affected by aging degradation and external demand shocks,resulting in the assumption of constant failure rate in traditional reliability models no longer being applicable.To this end,based on failure modes and mechanisms,considering the time-varying characteristics of the degradation process,a universal dependent competing failure processes considering time-varying characteristics(DCFP-TVC)for KooN structures was proposed by introducing degradation rate acceleration factor,degradation sudden increment coefficient,and time-varying hard failure threshold to achieve stochastic failure process modeling of non-constant failure rate actuators.The application of this model to the hydrogen oxygen purity interlocking circuit of wind power generation shows that compared to the constant failure rate model and other competing failure models,the proposed model can effectively solve the difficulties in reliability analysis of non-constant failure rate actuators,and the sensitivity analysis is carried out with important degradation parameters to illustrate its influence on reliability and failure time distribution,and the suggestion of adjusting the proof test interval is proposed to realize the risk control of non-periodic detection of actuators.
safety interlock systemcompeting failureprocess controlMonte Carlo simulationhydrogen production
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维普
