拖拉机驾驶室内噪声主要由直达声和混响声迭加而成，其中混响声占有重要地位，而混响rrrrrrrrrn声的大小和驾驶室的内饰密切相关。该文从理论上对驾驶室采用多种吸声材料内饰吸声处理后rrrrrrrrrn的噪声级进行了分析计算，并与试验结果进行了比较，两种结果基本吻合。对拖拉机驾驶室采rrrrrrrrrn用内饰吸声后，可使室内耳旁噪声降低２．３～３．１ｄＢ（Ａ）。 Tractor cab noise mainly by the direct sound and reverberation sound superposition, which reverberation occupies an important position, and the reverberation r r r r r r r r r Cab interior is closely related. This paper theoretically analyzes and calculates the noise level of the cab after using a variety of sound absorption materials for interior sound absorption treatment. The test results were compared, the two results are basically consistent. After the interior of the tractor cabinetry is used to absorb sound, the noise in the inner ear can be reduced by 2.3 ~ 3.1dB (A).