一种基于机械可靠性的安全设计方法  

A Safety Design Method Based on Mechanical Reliability

作　　者：欧阳杰 俞思源[1] Ouyang Jie;Yu Siyuan(Hangzhou Applied Acoustics Research Institute,Hangzhou 311400,China)

机构地区：[1]杭州应用声学研究所,杭州311400

出　　处：《机电工程技术》2022年第7期207-209,230,共4页Mechanical & Electrical Engineering Technology

摘　　要：机械安全设计是一种基于机械设计理论和实验数据所进行的理论设计,如大家熟知的安全系数设计法,但安全系数的取值很大程度上取决于设计师的主观经验,存在一定的盲目性。机械可靠性设计是将设计中与结构应力、材料强度相关的参数均视为一定的分布函数,利用机械可靠性中的应力-强度干涉理论建立可靠度模型,继而根据应力与强度的分布关系算得结构的可靠性。以某种受组合应力的结构为例,将结构的载荷情况与结构自身强度视为一定分布的参数,采用机械可靠性理论建立了结构的应力-强度的可靠性模型,最后根据设定的可靠度置信区间来推得满足该可靠性要求的结构尺寸参数,相较于安全系数法的设计,这种设计能更为直观地表达出其结构在使用时的可靠性。Traditional mechanical safety design is a theoretical design based on certain design theories and experimental data.Such as the well-known safety factor design method,the method has a lot of subjectivity and a certain blindness.Mechanical reliability design treats the parameters related to structural stress and material strength as a distribution function.Based on stress-strength interference theory in mechanical reliability,and the reliability model is established.Finally,according to the set reliability confidence interval,then the reliability of the structure is calculated according to the distribution relationship between stress and strength.Taking a structure subjected to combined stress as an example,the load and strength of the structure were regarded as distributed parameters,and the reliability model of stress strength of the structure was established by using the mechanical reliability theory.The structure size parameters that met the reliability requirements were obtained according to the set confidence interval.Compared with the design of the safety factor method,the design could more intuitively express the reliability of the structure in use.

关 键 词：安全系数 机械可靠性 应力-强度干涉 组合应力 

分 类 号：TH122[机械工程—机械设计及理论]