Reliability Evaluation And Optimal Design Of Electronic Circuit System Based On Importance Analysis

Reasonable evaluation of the reliability of aerospace electronic equipment has become a new trend and hot spot in aerospace industry in recent years,and the core of the reliability evaluation of aerospace electronic equipment is the reliability evaluation of electronic circuit systems.At present,countries with advanced science and technology can control the reliability of electronic circuit systems for the purpose of pre-determining the life cycle.On the contrary,there is still a gap between the reliability research of complex electronic circuit systems at home and abroad,and the importance analysis can help researchers control the sensitive components and key parts of the system and lay the foundation for life control technology.Based on the theory of importance analysis,this thesis qualitatively and quantitatively studies the failure links and influencing factors of electronic circuit systems,proposes reliability evaluation and design methods based on importance,optimizes the process,and establishes a technical route for life control of electronic circuit systems.The specific content and the innovation points are as follows:(1)In-depth study of importance analysis methods.Introduce the reliability evaluation methods of electronic circuit systems based on the importance of BDD and the importance of complex network nodes respectively,and analyze the reliability of the main circuit system examples of power conversion.(2)Aiming at the potential failure of electronic circuit systems,a reliability evaluation method of electronic circuit systems based on importance is proposed.Through the FMMEA analysis method,qualitatively analyze the failure physical mechanism of the electronic circuit system,and sort out the potential failure mode,cause,mechanism and impact information of the electronic circuit system.Based on the probability importance of BDD method and the node importance of the complex network model,an innovative method of comprehensive importance to evaluate the reliability of electronic circuit systems is proposed,and a case study is carried out.(3)A reliability design method for electronic circuit systems based on component importance is proposed,and on the basis of traditional reliability distribution,the AGREE reliability distribution method is improved based on the comprehensive importance proposed in this thesis.Considering the practical application of industry,a method of optimized reliability allocation process based on cost function is proposed to further optimize the reliability design method of electronic circuit system,which is helpful to guide the selection of components and improve the reliability of aerospace electronic products.And life control technology provides theoretical and technical support.(4)In order to explore the influence of the parameter disturbance of electronic components in actual work on the electronic circuit system,the circuit and its component parameter scanning simulation method is used to obtain the sensitivity of the circuit output parameter to the fluctuation of the component parameter,and compare it with the comprehensive importance.The comparison of the evaluation results verifies the rationality of reliability design based on comprehensive importance,and using the scientific combination of sensitivity and comprehensive importance of the comprehensive weighting method to put forward the new ideas for reliability evaluation and design.