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황성욱(Hwang, S.W.),방명제(Bang, M.M.),노국희(Rho, K.H.),김선주(Kim, S.J.) 한국소음진동공학회 2006 한국소음진동공학회 논문집 Vol.16 No.6
The tire is considered as one of the important noise sources having an influence on vehicle's performance. The Pattern noise of a tire is the transmission sound of airborne noise. On smooth asphalt road, Pattern noise is amplified with the velocity. In recent, the study on the reduction of Pattern noise is energetically processed. Pattern noise is strongly related with pitch sequence. To reduce the pattern noise, tire's designer has to randomize the sequence of pitch. The FFT is a traditional method to evaluate the level of the randomization of the pitch sequence, but gives no information on time-varying, instantaneous frequency. In the study, we found that Time-Frequency transform is a useful method to non-stationary signal such as tire noise.
Articulation index를 이용한 타이어 소음 측정방법 개발
김기전(G.J.Kim),조시완(S.W.Cho),노국희(K.H.Rho),유환종(H.J.Yu) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_2
A critical aspect of the performance of tyres for passenger vehicles is the quality of vehicle interior noise as a result of tyre-pavement interaction.Generally. vehicle manufacturers evaluate the noise performance of tyres by subjective tests conducted by skilled test drivers. Drivers rate a tyre on a 1 to 10 point scale with the higher number being better.<br/> For the effective control of the tyre noise, it is necessary to define the relationship of the subjective rating and the objective measurement. in this study the articulation index method is applied to evaluate a tyre noise from objective measurements. The measurement system is built to calculate an articulation index from vehicle interior noise due to a tyre. An articulation index rating is newly introduced to set up the correlation of subjective feeling rating and the articulation index. The results show that AI rating and subjective rating have a good correlation. AI rating can be used for the effetive control and the evaluation of a tyre noise.<br/>
황성욱(Sungwook Hwang),한진혁(Jinhyuk Han),임형진(HyungJin Im),노국희(Gookhee Rho) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The tire is considered as one of the important noise sources having an influence on vehicle’s performance. The Pattern noise of a tire is the transmission sound of airborne noise. On smooth asphalt road, Pattern noise is amplified with the velocity. In recent, the study on the reduction of Pattern noise is energetically processed. Pattern noise is strongly related with tread groove depth. And air-pumping mechanism is influenced by groove depth. So noise modeling is simulated by monopole source.