提出一种滚动轮胎冲击振动噪声预测的新方法。轮胎滚动接触引发的噪声是道路交通的一个重要课题，引发广泛关注，目前尚没有有效的分析预测方法。提出新方法包括用混合拉格朗日—欧拉描述法(Mixed Logrange Euler Method，MLE)分析大变形滚动接触结构的速度场、加速度场和接触变形。通过欧拉网格和拉格朗日网格的信息传递，完成滚动结构动力学分析。通过将轮胎花纹和胎冠整体三维建模，可以得到连续轮胎表面的加速度场。以参考空间中连续表面的加速度场作为声源，采用声学有限元方法得到滚动噪声的分布预测。实验和仿真结果对比证明本方法的可靠和准确，也证明1000 Hz以下轮胎的滚动噪声主要是花纹的冲击振动引起的噪声。提出的方法为预测分析轮胎的滚动噪声开辟一条可行的道路。%The noise caused by the rolling contact of the tire is an important subject in the road transportation industry, which has attracted more and more attention. Unfortunately, at present there is no effective method to analyze and predict the rolling noise. In this paper, a new method for predicting tire rolling impact noise was presented. This method was based on the Mixed Lagrange-Euler Method (MLE). Using this method, the velocity field, the acceleration field and the contact deformation of the rolling tire with large deformation could be analyzed. First of all, a 3-D model including the tire pattern and the whole tread was built. By using this model, the acceleration field of the continuous tire surface was obtained. Then, two kinds of tire meshes were developed, one was Lagrange mesh for the rolling tire, and the other was Euler mesh fixed in the space for the noise simulation. By means of mapping the acceleration of the Lagrange mesh to the Euler mesh, a non-rotational acceleration field was built. Finally, by using the aforementioned acceleration field as the acoustic source, the rolling noise could be predicted numerically by means of FEM. Mutual comparison of the results of test and simulation show that this method is feasible and reasonable. It also proves that the tire rolling noise lower than 1 000 Hz is mostly caused by the impact vibration of the tire pattern. The developed method provides a powerful tool to predict the rolling noise, especially for the rolling noise of patterned tires.
展开▼
