变阈值下可自愈产品的动态可靠性分析  

Dynamic Reliability Analysis of Self-healable Products Under Variable Thresholds

作　　者：王新刚 牛轶群 张钧豪 晏永飞[2] WANG Xingang;NIU Yiqun;ZHANG Junhao;YAN Yongfei(School of Mechanical and Electrical Engineering,Guangdong University of Petrochemical Technology,Maoming 525000,China;School of Mechanical Engineering,Liaoning Petrochemical University,Fushun 113001,China)

机构地区：[1]广东石油化工学院机电工程学院,广东茂名525000 [2]辽宁石油化工大学机械工程学院,辽宁抚顺113001

出　　处：《广东石油化工学院学报》2024年第4期108-113,共6页Journal of Guangdong University of Petrochemical Technology

基　　金：省部共建精密电子制造技术与装备国家重点实验室开放课题(jmdz2021012);广东省普通高校重点领域专项(2022ZDZX3013);广东省自然科学基金项目(2024A4050003420);广东石油化工学院人才引进项目(2020rc034)。

摘　　要：传统可靠性模型无法准确描述外界冲击和强度退化对产品自身可靠性的影响,忽略了强度随时间的变化规律。为了对存在自愈特性的机械零部件进行全寿命周期的动态可靠性分析,在考虑机械零部件的储藏期和性能退化的基础上,研究机械零件强度退化过程、性能退化过程、冲击过程的相互关系,建立了考虑性能退化过程的机械零件强度退化模型。并融入阈值的变化特性,运用随机过程和自愈理论建立考虑系统自愈和变失效阈值下机械零件的动态可靠性模型,利用二阶矩和摄动方法求出可靠性指标并计算出动态可靠度。通过对车辆拉杆的数值研究,说明了该模型能够较好地描述可自愈产品全寿命周期内的所有阶段,证明了该模型的有效性和合理性。The traditional reliability model cannot accurately describe the impact of external impact and strength degradation on the product's own reliability,ignoring the change rule of strength over time.To carry out the dynamic reliability analysis of the whole life cycle of the mechanical parts with self-healing characteristics,on the basis of considering the storage period and performance degradation of mechanical parts,the strength degradation process of mechanical parts,performance degradation process,and the interrelationship of the impact process are investigated,and the strength degradation model of mechanical parts with the consideration of the performance degradation process is established.Based on the established strength degradation model,the dynamic reliability model of mechanical parts under the consideration of system self-healing and variable failure threshold is established by applying stochastic process and self-healing theory to incorporate the changing characteristics of the threshold,and the reliability indexes and dynamic reliability are calculated by using the second-order moments and regression methods.Finally,through the numerical study of vehicle tie rods,it is shown that the model can better describe all the stages in the whole life cycle of the self-healing products,which proves the validity and reasonableness of the model.

关 键 词：动态可靠度 储藏期 系统自愈 变失效阈值 

分 类 号：TB114.3[理学—概率论与数理统计]