车辆驾驶室内噪声仿真及低频降噪处理  

Interior Noise Simulation and Low-frequency Noise Reduction of a Vehicle's Cab

作　　者：王欢[1] 刘汉光[1] 刘杰[1] 夏光亮 

机构地区：[1]江苏徐州工程机械研究院,江苏徐州221004

出　　处：《噪声与振动控制》2016年第1期88-91,共4页Noise and Vibration Control

摘　　要：首先建立车辆驾驶室白车身有限元模型并进行自由模态分析,通过与模态试验结果的对比进行模型修正,控制前8阶固有频率偏差在3%以内;其次建立结构-声场耦合有限元模型,计算两种试验工况下结构激励引起的内声场声压,计算结果与试验测试结果有较高的一致性,验证方法和模型的准确性;最后在低频段分析驾驶室面板声压贡献量,采用添加自由阻尼层的方法对驾驶室进行降噪处理,计算表明取得了良好的降噪效果。A body-in-white (BIW) finite element model of a vehicle’s cab was established and its structural modals were computed and analyzed. The finite element model was modified through the comparison of the result with the test result with their deviation of the first eight order natural frequencies between them controlled within 3%. Then, the sound-structure coupled finite element model was built. The sound pressures inside the cab excited by structural vibration under two test conditions were calculated. It was found that the calculation results and test results were in good agreement. Therefore, the correctness and effectiveness of the model and the method were verified. Finally, the contribution of the wall panels of the cab to the sound pressure in the low-frequency range was analyzed. And the free damping layer was applied to the panels to reduce the noise in the cab. Results of computation show that the noise was effectively reduced.

关 键 词：声学 驾驶室 噪声模块 声固耦合 

分 类 号：TB533.2[理学—物理]