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在有限元分析软件ANSYS中建立桥式起重机主梁的模型,进行了静强度和刚度分析;在此基础上,对桥式起重机主梁结构进行确定性的优化设计;采用对数正态分布来模拟起重载荷,对优化后的结构进行了可靠性分析。最后建立了桥式起重机主梁的可靠性优化模型,应用MATLAB优化工具箱进行了编程计算,结果对比表明:确定性优化设计未能考虑参数随机性的影响,而采用可靠性优化设计方法,保证刚度可靠度达0.989 6时,主梁减重比例为18.7%,从而实现了主梁在满足可靠度要求下的轻量化。
The finite element analysis software ANSYS was used to establish the model of the main girder of overhead traveling crane and the static strength and stiffness analysis was carried out. On this basis, the girder structure of the overhead traveling crane was determined optimally. The logarithm normal distribution Simulated lifting load, the reliability of the optimized structure was analyzed. Finally, the reliability optimization model of the main girder of overhead traveling crane is established. The MATLAB optimization toolbox is used for programming calculation. The results show that the deterministic optimal design can not consider the influence of parameter randomness, but the reliability optimization design method, When the stiffness reliability reaches 0.989 6, the ratio of main beam weight loss is 18.7%, so that the main beam can achieve the weight reduction under the requirement of reliability.