Abstract: In order to reduce the low frequency noise of the boat tractor cab, the cab wall structure was optimized. Firstly, the acousticvibration coupling model of the cab was established, and the modalbased acousticvibration coupling method was used to calculate and analyze the acoustic environment inside the cab to obtain the vibration frequency corresponding to the higher peak sound pressure reliability. Then, the plate contribution analysis was performed on the cab, and the plate with a larger noise contribution at the higher sound pressure peak was obtained. Finally, the noise reduction mechanism of the periodic perforated air pressure film damping structure was analyzed, and it was applied to the plate with a large noise contribution. The results showed that by laying periodic perforated air pressure film damping, the cab noise was reduced by 6dB, 11dB and 10dB respectively at the peak sound pressure, and the low frequency noise of the cab was significantly reduced. The research can provide a theory for the noise reduction of the boat tractor cab.

Key words: ship tractor, sound vibration coupling, cab, air pressure film damping, noise

摘要： 为降低船式拖拉机驾驶室的低频噪声，对驾驶室壁板结构进行优化设计。首先建立驾驶室的声振耦合模型，采用基于模态的声振耦合法对驾驶室内部声学环境进行计算分析，得到声压峰值较高处对应的振动频率，并通过与试验结果对比验证模型的可靠性。然后对驾驶室进行板块贡献量分析，得到在较高声压峰值处噪声贡献量较大的板块。最后分析周期性穿孔空气压膜阻尼结构的降噪机理，并将其应用在噪声贡献量较大的板块，结果表明，通过敷设周期性穿孔空气压膜阻尼，驾驶室噪声在声压峰值处分别降低6dB,11dB和10dB，显著降低驾驶室的低频噪声，研究可为船式拖拉机驾驶室降噪提供理论参考。

关键词: 船式拖拉机, 声振耦合, 驾驶室, 空气压膜阻尼, 噪声