车辆与动力技术

本文针对车载动力设备隔振降噪问题，论证研究机组的主要物理声源、传递路径、结构动态特性，提出了适用的隔声、隔振、消声、吸声、屏蔽等降噪方案，通过开展进气系统、排气系统、隔声罩等一系列设计改进，有效降低了机组的振动噪声水平。结果表明，车载动力设备改进前平均噪声为72.0 dBA，改进后平均噪声为67.5 dBA，降噪差值为4.5 dBA。该项研究可有效解决车载动力设备的振动噪声问题，对提高车载作业环境舒适性和安全性等提供了技术手段。

To solve the problem of vibration isolation and noise reduction for on-board power equipment,the research on primary physical sound source,transfer path analysis and structural dynamic characteristic was argumented and focused on. Applicable scheme on acoustic insulation,vibration isolation,noise elimination,sound absorption,shielding was proposed,design refinement for air intake system,exhaust system,acoustic enclosure was carried out. The result showed the noise level of the on-board power equipment was effectively reduced. Before improvement,the noise grade of the on-board power equipment was 72. 0 dBA,after improvement the noise grade was 67. 5 dBA,the noise reduction difference was 4. 5 dBA. This research could effectively solve the problem of vibration isolation and noise reduction for on-board power equipment, providing new means for improving comfort for vehicle environment.