The use of both non-parametric and parametric wave number decomposition techniques to characterize tire vibration is described here. When a tire was driven radially at a point on its treadband, measurements of the resulting radial treadband vibration were made around the treadband circumference by using a laser Doppler velocimeter. By performing a circumferential wave number decomposition of the space-frequency data, the propagation characteristics of the waveguide modes that contributed to the response of a tire could be visualized. However, to obtain quantitative estimates of the real and imaginary dispersion relations for each of these modes, an iterative Prony series approach has been used. By curve-fitting to the latter data, it is possible to obtain wave velocity and attenuation rate estimates on a mode-by-mode basis.
展开▼
