Abstract
A tread block impact device has been developed to record the pressure pulse signature generated by a single tread block impacting a surface. High-speed video images are used to relate the impact progression with the instantaneous acoustic signal. The acoustic pressure pulses generating this device can be associated with the changing volume velocity of the air displaced as the tread block approaches the surface. A simple monopole source can be used to predict the acoustical pulse that is radiated from impact. Experimentation and theoretical calculations will be correlated, as well as discussion of previous research. Noise due to a sequence of blocks on a tire can be inferred from single pulse results and the sound power level can be examined as a function of the speed of the tire. By using impact surfaces with known area removal and, hence porosity, experimental relationships between the pressure pulse signature and impact surface characteristics can be determined. By evaluating the frequencies generated by tread block impacts and the effect of porosity on noise reduction, tuned pavements which could attenuate the most irritating frequencies could be developed. The theoretical and experimental models may prove useful in suggesting means of reducing this component of traffic noise.
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