【摘要】 以某型号道路工程车辆车架为研究对象,在CATIA软件中建立了该车架的3D模型,导入Hypermesh进行网格划分并建立其有限元模型,根据车辆的实际工作情况,构建满载静止和支撑两种工况然后进行强度分析,选择应力与变形较大的工况进一步计算其模态频率。构建以厚度为应变量的响应面模型,基于车架近似模型以车架的总质量和第一阶模态频率作为优化目标,以车架的强度作为约束条件进行多目标优化。优化结果表明:在满足车架整体性能要求的前提下,优化后的车架第一阶模态频率提高了6%,并且车架质量减轻了7%,证实了该优化设计方法的有效性,为后续工程车架的设计提供指导。更多还原

【Abstract】 Taking frame of construction vehicle as research object,making use of the software of CATIA to establish the frame three-dimensional model.Adopt the method of finite element analysis,its finite element model is established by using Hypermesh software.Frame strength analysis in two working conditions,full-load static state and full-load supporting were completed,select the working condition whose stress and deformation is larger for modal analysis.Finally,Build the response surface model with thickness as dependent variable,taken frame total mass and the first order modal frequency as objective function,used the frame strength as constraint condition to multi-objective optimize with a approximate frame model.Optimization results show that the first order modal frequency of optimized frame increased by 6% and the weight reduced by7% under the condition of meeting the overall performance,which illustrate the validity of the optimization method and provide references for the design and improvement of construction frame.更多还原