周期阻尼结构低频带隙的研究与应用

首先基于声子晶体理论对周期阻尼结构的低频带隙模型进行了分析,证明了周期阻尼结构能够产生低频带隙。然后针对某款车型驾驶室存在的低频振动与噪声问题,根据理论模型的分析结果采用周期阻尼结构对车身板壳部件进行处理,并用有限元方法对处理结果进行预测。通过车内驾驶位置和副驾驶位置测点在处理前后的转速跟踪图对比,得到了在常用转速(1500～3500 r/min)下车内平均声压级衰减3 dB以上的效果。

Research and Application of Periodic Damping Structure Low Frequency Band Gap

Based on phononic crystal theory,low frequency band gap model of periodic damping structure is analyzed in this paper,and it’s proved that low frequency band gap can be generated in periodic damping structure.According to theory model,this periodic damping structure is applied on the car shell to attenuate low frequency vibration and noise,and FEM(Finite Element Method) is applied to analyze the attenuation effect of vibration.The comparing figure of speed tracking on driver’s seat and unoccupied seat shows that sound level is attenuated more than 3 dB when its rated speed is from 1 500 r/min to 3 500 r/min.