摘要
车内低频轰鸣声严重影响整车的乘坐舒适性。为此对某非承载式SUV车加速工况下1 700 r/min附近出现的轰鸣声问题进行排查研究,通过阶次分析、传动系扭振分析、传递函数分析和空腔模态分析技术分析发现引起1 700r/min附近车内噪声的原因是发动机二阶扭矩波动引起的传动系扭振经过后桥传递到车内放大后,与车内空腔模态产生耦合,从而产生较大的轰鸣声。通过采取加装扭转减振器的措施,有效抑制传动系扭振,试验结果表明车内轰鸣声得到明显改善,整体降低7.5 d B(A)左右,主观评价可接受。对低频轰鸣声问题的排查和解决有一定参考作用。
The interior low frequency booming noise of vehicles can seriously deteriorate ride comfort. In this paper, the booming noise of a non-load type body SUV at 1700 r/min engine rotation rate in acceleration condition was studied. Through the order analysis, torsional vibration analysis of the powertrain, transfer function analysis and cavity modes analysis, it was found that the interior booming noise is caused by the torque fluctuation of order 2 fxom the engine. The torsional fluctuation is transmitted through the rear axle to the inside of the vehicle and amplified. Then, it is coupled with the cavity modes so that the loud booming noise occurs. By installing an additive torsional vibration damper, the torsional vibration was efficiently reduced. The test result shows that the vehicle interior booming noise is reduced by 7.5 dB（A）, which is acceptable for subjective evaluation. This work provides a reference for seeking and solving the low-frequency booming noise problems.
出处
《噪声与振动控制》
CSCD
2015年第4期85-88,共4页
Noise and Vibration Control
关键词
声学
轰鸣声
阶次分析
扭转减振器
空腔模态
acoustics
booming noise
order analysis
torsional vibration damper
cavity modes
