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단순화된 타이어 진동전달 모델의 전달경로분석법을 이용한 로드노이즈 예측기술 개발
신태진(Shin, Taejin),박종호(Park, Jongho),이상권(Lee, Sangkwon),신광수(Shin, Gwangsoo),황성욱(Hwang, Sungwook) 한국소음진동공학회 2013 한국소음진동공학회 논문집 Vol.23 No.2
Quantification of road noise is a challenging issue in the development of tire noise since its transfer paths are complicated. In this paper, a simplified model to estimate the road noise is developed. Transfer path of the model is from wheel to interior. The method uses the wheel excitation force estimated throughout inverse method. In inversion procedure, the Tikhonov regularization method is used to reduce the inversion error. To estimate the wheel excitation force, the vibration of knuckle is measured and transfer function between knuckle and wheel center is also measured. The wheel excitation force is estimated by using the measured knuckle vibration and the inversed transfer function. Finally interior noise due to wheel force is estimated by multiplying wheel excitation force in the vibro-acoustic transfer function. This vibro-acoustic transfer function is obtained throughout measurement. The proposed method is validated by using cleat excitation method. Finally, it is applied to the estimation of interior noise of the vehicle with different types of tires during driving test.
타이어 특성과 역행렬법을 이용한 로드노이즈 예측 기술 개발
신태진(Taejin Shin),신광수(Gwangsoo Shin),황성욱(Sungwook Hwang),이상권(Sangkwon Lee) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
A noise caused by tire is divided into road noise(smaller than 500Hz caused by interaction with tire, road and vehicle body) and pattern noise(larger than 500Hz caused by tire pattern). A quantification of road noise is a challenging issue in vehicle NVH due to extremely complicated transfer paths of road noise as well as the difficulty in an experimental identification of input force from tire-road interaction. In this paper, to estimate input force measured acceleration during driving and inversed tire frequency response function are used. Also, a vehicle transfer function between ear point and axle was measured by acoustic excitation. The total system transfer function was calculated by inversion and multiplication of three frequency response function matrix. In inversion procedure, a Tikhonov regularization method was used in order to reduce inversion error. From the proposed method, it was able to evaluate the each contribution of tire to road noise. Finally, estimation model without driving test developed by using character of tire.
이건희(Kunhee Lee),신태진(Taejin Shin),이상권(Sangkwon Lee),김근영(Keunyoung Kim) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
These days, drivers are not satisfied with simply being the cabin noise reduced, but demand to hear better sound in the cabin. Therefore, Automobile companies are conducting a lot of research in order to reduce the noise by considering the feelings of the drivers. In this study, we have investigated the relationship between sound-absorbing materials and sound quality based on ray acoustics and signal processing. First, the impulse response functions from engine to dash and from dash to driver’s position are calculated using ray tracing method. Second, two impulse response functions are convoluted by engine noise signal to yield the cabin noise. The cabin noise are used for the calculation of sound metric and the subjective test. The correlation between sound metric and subjective test are used and estimated for the production of sound quality index in accordance with sound-absorbing materials. The experimental method is also performed for the validation of index. The index will contribute to saving test time and developing a good performance sound-absorbing material.