基于极值响应的某翻转输药机构运动精度非概率可靠性分析  

Non-probabilistic Reliability Analysis of Motion Accuracy for a Flip Drug Delivery Mechanism Based on Extreme Response

作　　者：高轩 陈龙淼[1] 羊柳[1] GAO Xuan;CHEN Longmiao;YANG Liu(School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学机械工程学院,江苏南京210094

出　　处：《弹道学报》2024年第2期59-64,共6页Journal of Ballistics

摘　　要：翻转输药机构是弹药自动装填系统的重要组成部分,其运动精度可靠性对于确保发射药输送动作的顺利执行至关重要。现有的机构运动精度可靠性研究主要基于输入参数的概率模型,需要通过大量实验样本数据来确定参数的概率分布函数,这对于很多工程实际问题而言成本极高甚至无法实现。然而,将输入变量考虑成非概率区间模型在一定程度上可以规避上述难点,区间模型不要求输入变量,有详细的样本特征,只需要确定输入变量的不确定幅度或者界限,这相对于确定变量的概率分布较为容易。在此基础上,针对机构运动精度可靠性的评估提出了一种基于输入参数非概率区间模型的新型时变可靠性分析方法。该方法旨在机构完整运动时间区间内搜索输出响应区间域的局部极值时刻,并引入非概率可靠性指标来评估和分析局部极值时刻的瞬时运动精度可靠性,由此将时变可靠性问题转化为瞬时可靠性问题。将该方法应用于某翻转输药机构进行可靠性评估,结果表明所提出的非概率时变可靠性分析方法对机构运动精度可靠性分析具有一定指导意义。The flip drug delivery mechanism plays a crucial role in an ammunition automatic loading system,and its motion accuracy reliability is of paramount importance to ensure the seamless execution of the delivery action.Existing researches on the motion accuracy reliability of this mechanism primarily rely on probabilistic models for input parameters,which necessitates a large amount of experimental data to determine the probability distribution function of these parameters.However,acquiring such data can be prohibitively expensive or even unattainable for many practical engineering problems.Nevertheless,considering the input variables as non-probabilistic interval models can partially alleviate these challenges since interval models do not require detailed sample characteristics but only necessitate determining the uncertain range or boundary of these variables,which is comparatively easier than determining their probability distribution.Building upon this foundation,a novel time-dependent reliability analysis method was proposed in this paper based on non-probabilistic interval models for evaluating the motion accuracy reliability of this mechanism.The method aims to search for the local extremum moments of the output response interval domain within the complete motion time interval of the mechanism.A non-probabilistic reliability index was introduced to evaluate and analyze the instantaneous motion accuracy reliability of these local extremum moments,thereby transforming the time-varying reliability problem into an instantaneous reliability problem.The proposed method can be applied to assess the reliability of motion accuracy in a flip drug delivery mechanism.The results demonstrate that this non-probabilistic time-dependent reliability analysis method holds significant guiding implications for analyzing the motion accuracy reliability of such mechanisms.

关 键 词：翻转输药机构 运动精度可靠性 非概率区间模型 极值分析 

分 类 号：TJ385[兵器科学与技术—火炮、自动武器与弹药工程]