论文部分内容阅读
某微型客车在加速工况下,发动机转速为1 100 r/min附近时车内存在轰鸣噪声,严重影响汽车乘坐舒适性。通过道路试验,对车内噪声和传动系统关键零部件进行实车测试。通过以信号处理为基础的噪声源识别方法分析,确定该车内轰鸣噪声系由传动轴中间支撑振动激励传递至车身,并激励乘坐室顶棚结构振动和空腔声学模态耦合所致。提出采用更改传动轴中间支撑衬套刚硬度和在车顶粘贴阻尼贴片的减振降噪措施,取得最大降噪5 d B(A)的效果。
When a minibus is in an accelerating condition, there is roaring noise in the vicinity of an engine speed of 1 100 r / min, which seriously affects vehicle ride comfort. Through the road test, the car noise and transmission system of key components for real car test. Through the analysis of the noise source identification method based on signal processing, it is determined that the noisy noise in the vehicle is transmitted to the vehicle body by the vibration excitation of the middle supporting shaft of the transmission shaft and the acoustic vibration coupling of the ceiling structure and the cavity is stimulated. The effect of changing the rigidity of the middle support bush of transmission shaft and the damping and noise reduction of the damping patch on the roof is proposed. The maximum noise reduction of 5 d B (A) is achieved.