轮胎模态分析试验研究

为了优化轮胎模态试验方法，得到精确的轮胎模态参数，结合LMS Test Lab，研究模态试验三要素的选用原则，即测点布置、边界约束和激励形式的选取方式。试验结果表明：(1)对轮胎单一胎面进行模态测量，存在模态遗漏现象，且轴向与径向阵型易混淆，因此须进行轮胎三胎面(内胎面、正胎面、外台面)布点测量；(2)胎面整周少于36个测点时，轮胎高阶次花瓣阵型难以清晰呈现，因此须于三个胎面等角度间隔平行布置36×3个测点；(3)轮胎处于整车安装离地状态受激励时，支撑位移量微小，优于软绳约束状态；(4)激振器激励信号相干系数达到1，优于力锤锤击信号，并且使试验进行更加便捷与高效。本文提出了一种新的轮胎模态测试方法，并应用此方法得到了准确的轮胎模态参数，研究结果为轮胎噪声与振动控制提供了基本依据。

The Experimental Study on Tire Modal Analysis

In order to optimize the tyre modal analysis experiment, and obtain the precise parameters of tire modal, by adopting LMS Test Lab, this paper studies the selection principle of measurement point layout、boundary constraint and incentive form. The results show that:(1)One single surface measuring easily lead to modal parameters lose and modal shape confusion, so it should be measure three tire surfaces (the inner、front and outer surface); (2)The high order modal shape is not clear with less than 36 points around the tyre circle, so there are arranged 36×3 points according to the 10° interval; (3) The tyre should be installed on the vehicle and free from the ground, the support displacement in this state is very small, this is better than soft rope constraint; (4) The signal coherence of exciter is 1 and it’s better than hammer, and it makes the experiment more convenient and efficient .This paper presents a new method for tyre modal testing, and obtain the precise parameters through this method. These results provide a fundamental basis for the noise and vibration control of tyre.