双梁桥式起重机主梁动态特性分析及响应面优化

Dynamic analysis and response surface optimization of the main beam of a double-beam crane

为提升起重机主梁结构的抗振性能,针对双梁桥式起重机主梁进行动力学分析,并基于响应面法对主梁结构进行动力学优化。针对双梁桥式起重机主梁模型进行有预应力的模态分析和谐响应分析,得出主梁结构的固有频率、振型及频响曲线,对比分析结果,选择谐响应分析下的X方向、Y方向的最大位移作为后续优化设计的目标函数。通过灵敏度分析筛选设计变量,并运用面心复合设计获取样本点,构建Kriging响应面模型进行结构和材料参数优化。结果显示,优化后的主梁相比原型主梁,谐响应分析下的X方向、Y方向的最大位移分别降低了23.1%和25.5%,其质量降低了1.8%,这对主梁结构设计及抗振性能提升提供了技术支持。

In order to improve the anti-vibration performance of the crane main beam structure,the dynamic analysis the double-beam crane main beam was carried out,and the dynamic optimization of the main beam structure was carried out based on the response surface method.The pre-stressed modal analysis and harmonic response analysis were carried out for the double-beam crane main beam model,and the natural frequency,mode shape and frequency response curve of the main beam structure were obtained.By comparing the analysis results,the maximum displacements in X direction and Y direction under the harmonic response analysis were selected as the objective function of the subsequent optimization design.By screening design variables through sensitivity analysis and obtaining sample points using face center composite design,a Kriging response surface model for structural and material parameter optimization was constructed.The results show that the optimized main beam reduces the maximum displacements in the X and Y directions by 23.1%and 25.5%,respectively,under harmonic response analysis compared to the prototype main beam,and its mass was also reduced by 1.8%,providing technical support for the structural design and vibration resistance improvement of the main beam.