摘要
目的实现拔销器可靠性的定量分析和高效精确评估,研究拔销器工作过程中随机变量对可靠性的影响,提出一种基于不确定性的拔销器机构运动可靠性建模与分析方法。方法首先,基于应力-强度模型和拔销器的机构运动失效模式,建立极限状态方程;然后,综合考虑工作过程中不确定性因素的影响,采用基于Kriging代理模型逼近极限状态方程的机构运动可靠性分析方法,对拔销器的机构运动进行高效可靠性分析;最后,对拔销器机构运动中的随机变量进行可靠性灵敏度分析,确定随机变量对拔销器的机构运动的可靠性影响程度,为优化设计提供方向。结果拔销器机构运动的可靠度均大于0.9999,达到设计要求。影响拔销器活塞启动可靠性最大的是剪切销直径d,其次是A、f、ρ等,影响活塞运动可靠性最大的是A,其次是f、ρ。结论该方法能够准确描述不确定性因素对拔销器机构运动的影响,提升机构运动可靠性定量分析的精度和效率,为拔销器的精细化设计提供了理论支撑。
The work aims to study the effects of random variables on the reliability in the working process of pin puller and propose a modeling and analysis method for the motion reliability of the pin puller mechanism based on uncertainty,so as to realize the quantitative analysis and efficient and accurate evaluation of the pin puller reliability.Firstly,based on the stress-strength model and mechanism motion failure mode of the pin puller,the limit state equation was established.Then,considering the effects of uncertainty factors in the working process,a reliability analysis method of mechanism motion based on Kriging surrogate model to approximate the limit state equation was proposed,and the efficient reliability analysis of the mechanism motion of the pin puller was carried out.Finally,the reliability sensitivity analysis was conducted to the random variables in the mechanism motion of the pin puller to determine the effects of the random variables on the motion reliability of the pin puller mechanism,which provided the direction for the optimization design.The motion reliability of pin puller mechanism was more than 0.9999,meeting the design requirements.The diameter of shear pin d was the biggest factor affecting the startup restartup reliability of pin puller piston,followed by A,f,ρ,etc.The biggest factor affecting the reliability of piston motion was A,followed by f,ρ.This method can accurately describe the effects of uncertainty factors on the motion of the pin puller mechanism,improve the accuracy and efficiency of the quantitative analysis of mechanism motion reliability,and provide support for the fine design of the pin puller.
作者
杨琨
程涛
YANG Kun;CHENG Tao(Shaanxi Applied Physical-Chemistry Institute,Xi'an 710061,China)
出处
《装备环境工程》
CAS
2022年第12期14-18,共5页
Equipment Environmental Engineering
