Abstract
Tire/road noise is caused by the interaction between the tire and the road surface. Both tread pattern and road texture excite the tire, causing vibration and air displacement. Close proximity (CPX) method is used to measure the near-field tire/road noise. An optical sensor (tachometer) is also installed to record the once-per-revolution signal of the tire, which is used to perform the order tracking analysis in order to break down the tire noise into the tread pattern and nontread pattern noise components (the latter mainly from pavement excitation). This technique can also be expanded to lab drum test applications where the noise can be separated into tread pattern noise, roadwheel (drum) noise, and turbulence noise components.
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