厢式汽车车内噪声的试验研究

An Experimental Research on the Noise inside Automobile

要控制汽车车内噪声，减少其对驾驶员和乘客造成的危害，首先必须找出车内的主要噪声源本文论述了用声压法识别汽车车内主要噪声源的过程，利用声场分析技术和谱分析技术对车内的主要噪声源进行了分析通过大量的试验研究，认为发动机是导致该车车内噪声较大的主要原因，是降噪工作的重点要进行车内噪声的控制，应首先考虑抑制发动机的辐射噪声，其次要加强车身门窗的密封性并根据试验样车的实际结构特点，提出了一系列改善车内噪声性能的措施，经部分改进试验，取得了降噪１．２～３．９ｄＢ（Ａ）的良好效果这些措施对降低车内噪声，优化车内声学环境。

The main noise source must be detected first in order to control the noise inside automobile and to reduce the damage of noise to the drivers and passengers .The distinguishing technology by sound pressure method to identify the noise source is discussed in the article . The sound field analysis and spectrum techniques are used to study the main noise inside automobile . From a great amount of experimental research , it is found that engine is the main noise source and the suppression of radiating noise of engine should be firstly considered in noise control,and the seal of vehicle body should be improved. The authors have put forward a series of measures for improving the noise characteristics according to the automobile construction and obtained good effect with the noise level decreased by 1.2～3.9dB(A).All these measures are valid both for controlling the noise inside vehicle and for improving sound environment.