基于支持向量机的桥式起重机金属结构非概率可靠性分析  

Non-probabilistic Reliability Analysis of Bridge Crane Metal Structure Based on Support Vector Machine

作　　者：杨正茂[1] 孟文俊[1] 

机构地区：[1]太原科技大学机械工程学院,太原030024

出　　处：《机械科学与技术》2015年第3期381-385,共5页Mechanical Science and Technology for Aerospace Engineering

基　　金：国家自然科学基金项目(51075289;51110105011);山西省自然科学基金项目(2012011025-5)资助

摘　　要：基于集合理论凸方法中的凸模型方法,对桥式起重机金属结构系统存在的不确定性,推导出其非概率可靠性指标。对DQ28.5m_75t_A6桥式起重机金属结构系统进行了有限元强度分析,获得了结构危险点的应力响应。通过试验设计方法获取结构危险点的应力与不确定参数的样本,并利用支持向量机技术得到了应力响应关于不确定系统参数的显式表达式,进而计算出此结构的非概率可靠度。结果表明:该方法成功的解决了金属结构的非概率可靠性分析问题。According to the uncertainty existed in the metal structure of the bridge crane,the non-probabilistic reliability index has been derived based on the convex model of the set-theory. The strength of the metal structure of the bridge crane DQ28.5m_75t_A6 is analyzed with finite element method and the stress responses of dangerous point on the structure are obtained. The samples of stresses and uncertain parameter of structure dangerous point are gained through design of experiment( DOE),and the explicit expression of the stress response with respect to uncertain parameter is obtained with the support vector machines( SVM) method,and then the non-probability reliability of this structure is achieved. The result shows that the method can be used to solve the problem of nonprobabilistic reliability of metal structure.

关 键 词：支持向量机 可靠性分析 结构 有限元法 不确定系统 

分 类 号：TH215[机械工程—机械制造及自动化]