摘要
针对磨损过程的动态性和随机性,提出一种构件磨损随机过程建模方法,为磨损构件的可靠性分析和寿命预测提供基础。基于平稳随机过程,给出了磨损随机过程建模基本流程;以Ar-chard磨损公式为例,推导了任意时刻磨损量的分布函数,从而能够评估磨损构件的动态可靠度和概率失效时间;结合活塞气环的实测数据,建立磨损随机过程模型,并给出抗磨损可靠度随行驶里程的变化规律。通过算例发现,磨损随机过程模型与实际相符,而考虑稳态磨损过程的磨损率为随机变量,计算结果偏保守。这样,为工程构件磨损的定量评估探索新的途径。
Considering the time dependence and randomness of wear process,a modeling method of wear random process was proposed for the reliability analysis and lifetime prediction of wear components.A basic modeling flow of wear random process was established based on the stationary random process.Taking Archard Equation as an example,the distribution function of wear at any time was deduced to predict quickly the dynamic reliability or probability life of wear structural component.Finally,the wear random process model of piston ring of military vehicle engine was built by using test data,and the relationship between the anti-wear reliability of piston ring and the road haul of vehicle was given.The results indicate that wear random process model is in accordance with practical working condition,and the reliability degree or life value predicted by considering the wear rate as a random variable is conservative.In this way,a new wear quantification evaluation method can be introduced to engineering.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2010年第10期1379-1382,共4页
Acta Armamentarii
基金
武器装备预先研究项目(9140A19020708BQ0601)
国防基础科研项目(D0920060310)
关键词
材料失效与保护
磨损
随机过程
可靠性
磨损失效时间
平稳过程
动态可靠度
defectiveness and conservation for material
wear
random process
reliability
wear failure time
stationary process
dynamic reliability
