Reliability Prediction Method And Software Implementation Of Typical Airborne Electronic Equipment Based On Failure Physics And Fault Tree Analysis

As we all know,reliability engineering already exists in all aspects of production and life,especially for the reliability assessment of the aerospace field or high-precision industry,which can greatly reduce the production costs of enterprises,shorten the development cycle of products,and save a lot of manpower and materials for the country.Reliability assessment is a very important work in the process of product design,production and testing.A comprehensive and accurate reliability assessment can not only correctly evaluate the specific reliability level of the product,but also feedback the corresponding reliability information and data to the product.Designers,give guidance on the improvement of product reliability design.At present,the analysis of the reliability of electronic systems in China is mainly based on a large amount of experimental data and mathematical statistics.There are many deficiencies.Therefore,in this paper,based on the failure physics,the reliability evaluation of electronic systems is carried out.The failure mechanism and failure model of electronic components in the system are analyzed to complete the reliability evaluation of the underlying components of the system.The reliability evaluation model needs to be obtained through finite element simulation.The fault tree analysis is used to obtain the relationship between the underlying failure mode and the system-level failure mode.The system-level failure rate is calculated and the importance of the influencing factors is analyzed.Finally,the analysis method is implemented in software.This thesis mainly completed the following work:Firstly,the failure physical analysis methods,common failure modes of electronic components,and typical failure mechanisms are introduced.For the system failure analysis,the FMEA and FTA reliability analysis methods are introduced.Aiming at the problem that the failure physical model parameters of some components are difficult to determine experimentally,the finite element analysis software ANSYS is used to simulate the failure process of the device and extract the corresponding parameters,and calculate the fatigue life according to the life model;Next,the reliability analysis of a typical airborne electronic device-oxygen monitor is performed.Based on the clarification of each functional module and reliability structure level of the system,the reliability of the underlying electronic components in the system under multiple failure mechanisms is verified.Sexual modeling.Through the fault tree analysis method,the logical relationship between the failure modes at various levels is clarified,the failure rate of the system-level failure modes is calculated,and the importance of the influencing factors is analyzed.Finally,the reliability evaluation method used in this paper is implemented by software.The software is written in the computer programming language python.Its function consists of two parts: failure physical model library analysis and FMEA analysis.The software can quickly read the hierarchical relationship of the electronic system,and evaluate the electronic components and sub-modules through the parameter settings of the components.Failure rate,and based on this,the entire electronic system reliability analysis report and data generation and output are realized.