基于未确知理论的机械结构能度可靠性方法  

Possibilistic Reliability Methods for the Mechanical Structure Based on Unascertained Theory

作　　者：杨瑞刚[1,2] 吕明[1] 徐格宁[2] 周科[2] 

机构地区：[1]太原理工大学机械工程学院,山西太原030024 [2]太原科技大学机械电子工程学院,山西太原030024

出　　处：《四川大学学报（工程科学版）》2008年第6期170-175,共6页Journal of Sichuan University (Engineering Science Edition)

基　　金：“十一五”国家科技支撑计划项目(2006BAK02B04);山西省青年科技研究基金(2006021029);山西省自然科学基金(2008011043-1)

摘　　要：针对机械设备结构在可靠性评估时由于客观原因的限制和影响,试验数据处于小样本或贫信息的情况下,可靠性计算结果与实际情况有较大差别,提出了基于未确知理论的能度可靠性分析方法。其采用优化准则法选取可能的临界元,用增量载荷法确定主要失效模式的极限状态方程,应用未确知理论拟合结构所受载荷分布的数学特征值。通过实例分析,得出某企业桥式起重机的失效可能度。并通过算例说明,采用本方法计算可提高结构的可靠度。Due to the objective restrictions and impact,the reliability test data for heavy engineering machinery and equipment are in small samples and poor information.Therefore,there are differences between the results of reliability analysis and actual ones.To make the differences less,the possibilistic reliability method based on unascertained theory was put forward.The method were consisted of three phages in which the critical elements was selected by the optimality criteria method,limit state equations of main...

关 键 词：未确知理论 能度可靠性 起重机结构安全 

分 类 号：TB114.3[理学—概率论与数理统计]