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http://dx.doi.org/10.5050/KSNVN.2005.15.7.788

Numerical Method for Prediction of Air-pumping Noise by Car Tyre  

Kim, Sungtae (서울대학교 기계항공공학부)
Jeong, Wontae (서울대학교 기계항공공학부)
Cheong, Cheolung (한국표준과학연구원 물리표준부 음향진동실)
Lee, Soogab (서울대학교 기계항공공학부)
Publication Information
Transactions of the Korean Society for Noise and Vibration Engineering / v.15, no.7, 2005 , pp. 788-798 More about this Journal
Abstract
The monopole theory has long been used to model air-pumped effect from the elastic cavities in car tire. This approach models the change of an air as a Piston moving backward and forward on a spring and equates local air movements exactly with the volume changes of the system. Thus, the monopole theory has a restricted domain of applicability due to the usual assumption of a small amplitude acoustic wave equation and acoustic monopole theory This paper describes an approach to predict the air-pumping noise of a car tyre with CFD/Kirchhoff integral method. The tyre groove is simply modeled as piston-cavity-sliding door geometry and with the aid of CFD technique flow properties in the groove of rolling car tyre are acquired.'rhese unsteady flow data are used as a air-pumping source in the next CFD calculation of full tyre-road geometry. Acoustic far field is predicted from Kirchhoff integral method by using unsteady flow data in space and time which is provided by the CFD calculation of full tyre-road domain. This approach can cover the non-linearity of acoustic monopole theory with the aid of Non-linear governing equation in CFD calculation. The method proposed in this paper is applied to the prediction of air-pumping noise of simply modeled car tyre and through the predicted results, the influence of nonlinear effect on air-pumping noise propagation is investigated.
Keywords
Tire; Air-pumping Noise; Monopole Theory; Kirchhoff Method;
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