Characteristics of sound pressure in the tire cavity arising from acoustic cavity resonance excited by road roughness

Abstract

Under the conditions of the low-noise powertrain design and the small road roughness, the noise in car cabin from the tire cavity resonance is often remarkable. The analysis on the sound pressure inside the tire cavity arising from cavity resonance is the key work for understanding the transferring characteristics and performing the subsequent noise control. In this paper, the finite element model of a tire coupling with acoustic medium in the tire cavity is constructed and verified by tests. In order to simulate tire cavity resonance excited by road roughness, the excitation is researched firstly. There are two main excitation of tire cavity resonance: effective road roughness and the effects of tire’s rolling. The effective road roughness obtained from the road roughness power spectrum density and vehicle vibration model is taken into consideration. On this basis, the sound pressure distributions in tire cavity excited by road roughness are simulated. Also the influences of inflation pressure as well as tire load on the sound pressure distribution are studied. These works may lay a foundation for attenuating the noise inside car cabin from tire acoustic resonance.