【摘要】 利用某国产轿车的声固耦合有限元模型对车内低频噪声进行了预测、分析和优化,并通过实车道路试验得到动力总成悬置激励、路面通过悬架传递到车身的激励以及驾驶员耳旁声压级响应。将测得的激励施加于模型中的相应位置进行频率响应分析,并预测车内低频噪声。从预测结果与试验结果的对比可以看出,二者具有较好的一致性,证明了轿车声固耦合模型的有效性。分析了驾驶员耳旁声压级对车身结构各壁板的灵敏度,根据灵敏度分析结果,应用涂贴阻尼层的方法对车内噪声进行控制,通过对阻尼层的试验优化设计,优化了涂贴阻尼层的密度及厚度。优化后车内噪声峰值降低了1.13dB(A),总声压级降低了0.62dB(A),阻尼层的总质量降低了1.935kg。更多还原

【Abstract】 To predict,analyze and optimize the low frequency noise of a Chinese vehicle,a structural-acoustic coupling finite element model was established.The excitation signals at the suspension mountings and engine mountings,and the responding signal of the interior noise were measured with road testing.Appling the excitation signals to the structural-acoustic coupling model,the frequency response analysis was carried out and the low frequency noise was calculated.The simulation response of noise was compared with the result of testing.The consistency between the simulation and testing results proved the validity of the model.The driver’s noise sensitivity on the thickness of each panel of the vehicle was calculated.According to the results of the sensitivity analysis,the damping layer was aligned to the structure to control the noise.The density and thickness of the damping layer were optimized by optimal experimental design.With the optimized damping layer,the peak value of the interior noise was reduced by 1.13dB(A)and the overall sound level was reduced by 0.62dB(A),the total mass of the damping layer was reduced by 1.953 kg.更多还原