基于声振耦合的装载机驾驶室多目标形貌优化设计  

Multi-objective structural optimization design of loader cab considering acoustic-structural coupling

作　　者：张俊红[1] 李忠鹏[1] 毕凤荣[1] 王键[1] 朱传峰[1] 

机构地区：[1]天津大学内燃机燃烧学国家重点实验室,天津300072

出　　处：《振动与冲击》2015年第7期46-50,70,共6页Journal of Vibration and Shock

基　　金：国家高技术研究发展计划(863计划)资助项目(2012AA1117064)

摘　　要：对某装载机驾驶室及室内声腔进行建模得到声振耦合模型,通过SIMO法模态试验验证所建模型的准确性,测取悬置点激励力并进行频响分析及室内噪声预测。结合耦合模态频率和噪声曲线峰值频率确定关键优化频率,在驾驶室的最大扭矩工况下进行静力学分析,采用折衷规划法和平均频率法将驾驶室静态整体刚度和多阶关键频率归一为Euclidean距离的多目标函数,对驾驶室进行多目标形貌优化。结果表明:此优化方法在驾驶室结构优化上的应用综合提高了结构整体刚度和多阶关键固有频率,避免了单频优化时频率震荡现象,得到了优化目标的整体Pareto最优解,室内噪声总声压级降低了3.03 d B。The model of a loader cab and its acoustic cavity was built to compose an acoustic-structural coupling model and was verified by SIMO mode test. The excited forces at suspension points were measured, then the frequency under the typical working condition of the cab. The combination of the compromise programming approach and the average frequency method was applied to the multi-objective topography optimization of the cab by merging the static stiffness and several critical dynamic frequencies as the objectives in a Euclidean distance＇s multi-objective function. The result shows that the application of the method in the cab optimization can improve the static stiffness and the critical frequencies synthetically, avoiding the frequency oscillation phenomenon and getting the Pareto solution of the optimal objectives, and the overall sound pressure level in the cab is dropped by 3.03dB.

关 键 词：声振耦合 折衷规划法 平均频率法 多目标形貌优化 低噪声 

分 类 号：TB535[理学—物理]