Structural-acoustic analysis of tire cavity system

Tire cavity resonance induced cabin noise has been a major unsolved customer complaint issue for a long time. This chapter explores the tire cavity noise by means of analytical, finite element, and experimental methods. The acoustic response inside tire cavity is described as the source of the structure-born noise found in vehicle cabin. Analytical solution of coupled tire cavity structural-acoustic system using impedance compact mobility matrix is shown. The result is in terms of the sound pressure inside the tire cavity as well as the tread wall vibration velocity. The analytical result is verified by finite element simulation results. Both the analytical and simulation results are verified by experimental results where microphone and accelerometer are used to detect the tire cavity resonance as well as the changes to the resonance peaks of the sound pressure and vibration spectrum amplitude once the tire deformed due to load. Latest tool to measure tire cavity resonance is mentioned whereby testing will be easier to be performed on the road while improving the data quality.