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3.03dB。
Abstract
The models of a loader cab and its acoustic cavity were built to compose an acoustic-structural coupling model which was verified by SIMO mode test, and the excited force of the suspension points was measured, then the frequency response analysis and the prediction of the cab interior noise were proceeded. The critical optimization frequencies were determined according to the coupling mode and the sound pressure level curve, and the static analysis was made under the typical condition of the cab working. 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 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 of oscillation phenomenon and getting the Pareto solution of the optimal objectives, and the overall sound pressure level 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
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Key words
acoustic-structural coupling /
compromise programming approach /
average frequency method /
multi-objective topography optimization /
low noise
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