有限元分析与支持向量机结合对2t/8.7m壁行式起重机的可靠度分析

Reliability Analysis of 2t/8.7m Wall-Crane Based on Finite Element Analysis and Support Vector Machine

针对2t/8.7m壁行式起重机承载波动范围大,安全可靠性风险高及难以有效识别等问题,提出了一种基于支持向量机的可靠度分析方法。利用有限元工具ANSYS构建2t/8.7m壁行式起重机有限元模型,通过研究两种典型工况下载荷分布,确定了悬臂梁尾部拐角处为起重机应力最集中的部位。基于此引入支持向量机方法,对悬臂梁尾部受力情况进行诊断,搭建支持向量机预测模型。构造实验获取测试样本和验证样本,通过实测应力值与模型预测值进行对比,相对误差均在5%以内,结果验证了该方法对悬臂梁受力预测的可行性,该方法为壁行式起重机实际作业时可靠度分析提供了基础支持。

Aiming at the problems of 2t/8.7m wall-traveling crane,such as large load fluctuation range,high risk of safety and reliability are difficult to identify effectively,a method of equipment reliability analysis based on support vector machine is pro⁃posed.The finite element model of 2t/8.7m wall-traveling crane cantilever beam was built by using the finite element software AN⁃SYS.By studying the load distribution under two typical working conditions,it is determined that the corner at the end of the canti⁃lever beam is the most concentrated part of the crane stress.Based on this,the support vector machine method is introduced to diag⁃nose the stress on the cantilever beam tail,the prediction model of support vector machine is built.Through the comparison be⁃tween the measured stress data and the model prediction data,the relative error is within 5%,the feasibility of the method to pre⁃dict the stress on the cantilever beam is verified effectively.The method provides the basic support for the reliability analysis of the actual operation of the wall-traveling crane.