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DAMPER FOR TIRE CAVITY NOISE AND WHEEL VIBRATION

IP.com Disclosure Number: IPCOM000240144D
Publication Date: 2015-Jan-06
Document File: 2 page(s) / 298K

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DAMPER FOR TIRE CAVITY NOISE AND WHEEL VIBRATION

Tire-wheel assembly is the key contributor to road noise which is one of the major annoyances to vehicle occupants. Tire contribution to road noise is due to acoustic resonance in the air-filled circular cavity inside the tire mounted on a wheel. The resonance frequency is determined by the circumferential length of the circular cavity at the centroid of its cross section and is typically between 200 and 250 Hz in the case of standard passenger vehicle tires. Wheel contribution to road noise is due to its low order structural resonances (typically dominated by the wheel disc bending). Since such resonances may occur also in the 200-250 Hz range, wheel vibration can significantly amplify tire cavity noise.

Previous solutions for the tire-wheel induced road noise have been focused only on the tire acoustic cavity noise reduction. For example, patent US 6,390,563 B1 proposes use of a sound-absorbing material located on the wheel rim. To avoid damage to the sound absorbing material during the tire retrofitting, the wheel rim is modified to have a recessed receptacle on its circumferential surface where the sound absorbing material is located. In another example, patent US 6,450,225 B2 disposes a tire noise damper made of a flexible material and comprising a base secured to the wheel rim and a number of flaps extending from the base. During the wheel-tire rolling in a moving vehicle, the flaps can be risen radially outwards from the wheel rim by centrifugal force to block the annual tire hollow to reduce acoustic tire cavity noise.

To effectively reduce the tire-wheel induced road noise, a device is proposed which can attenuate both acoustic resonance noise and the wheel vibration. Such a device uses sound absorbing material (acoustic liner) to suppress a tire cavity resonanc...