TBR轮胎噪声近-远场点/线声源混合传播模型研究

Hybrid propagation model for the TBR tire near-far field noise generated from point/line sound sources

TBR轮胎载重大、强度高、噪声大,对其噪声传播规律研究具有重要的工程应用价值。采用仿真与试验联合分析方法,基于理想点声源与线声源传播理论,考虑传播距离对轮胎噪声的衰减效应,构建了TBR轮胎噪声近-远场点/线声源混合传播模型。通过研究315/80R22.5型号TBR轮胎近-远场噪声传播规律,标定提出混合传播模型的关键参数,并将模型预测值与试验结果比较,表明:混合传播模型预测衰减值的最大差值为1.4 dB(A),平均差值为0.92 dB(A);在室外噪声测试距离范围内,该混合传播模型给出了轮胎正侧方向、不同测点上声压级的定量关系,可由近场噪声声压级预测远场噪声声压级;在轮胎正侧方向测点距离0~8 m内,测点高度在0~1.264 m内,等效测点距离相同时,测点高度对噪声声压级的影响较小。研究工作对低噪声轮胎设计研发、轮胎近-远场噪声传播规律研究和交通降噪具有参考价值。

By virtue of the theory about the sound propagation from ideal point sound sources and line sound sources and considering the attenuation effect of propagation route on tire noise,a TBR hybrid propagation model for the tire noise in near and far field generated from point/line sound sources was constructed using the FEM simulation and test analysis.By studying the near-far field noise propagation of 315/80R22.5 tpye TBR tires,the key parameters of the mixed propagation model were calibrated,and the predicted value by the model were compared with the test results,which shows that the maximum deviation of the predicted attenuation value by the model is 1.4 dB(A),and the average deviation is 0.92 dB(A).In the region of outdoor noise measurement,and at the positive side of the tire,the hybrid propagation model can give the sound pressure level quantitatively at different measuring point.The sound pressure level of far field noise can be predicted from that of near field noise.At the positive side of the tire,when the measuring point is at a distance in the range of 0—8 m,and the measuring point height is in the range of 0—1.264 m,the measuring point height has little influence on the noise pressure level at the same equivalent measuring point distance.The research work has certain reference value for the low noise tire design and development,the tire near-far field noise propagation analysis and the traffic noise reduction.