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(1) As with rim modifications, tire designs which shift the modal frequency of the tire cavity outside of 200 – 250 Hz will decouple the structural and cavity resonant mode, reducing audible noise levels. As such, potential solutions which modified the tire cavity were investigated.
(2) Production implementation of the cavity filled foam as a sound absorption material within the tire cavity needs to resolve the safety and durability issues. The filled foam would melt when exposed to high temperatures, be highly flammable and be able to emit toxic emissions. Furthermore, inside the tire, the cavity is a high speed rotational environment which could result in the required replacement of the foam during vehicle servicing or tire replacement, thereby increasing the cost to consumers.
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