Modeling and Simulation of Road Noise by Using an Autoregressive Model

ABSTRACT A new method for the simulation of the vehicle's interior road noise is proposed in the present study. The road noise model can synthesize road noise of a vehicle for varying driving speed within a range. In the proposed method, interior road noise is considered as a stochastic time-series, and is modeled by a nonstationary parametric model via two steps. First, each interior road noise signal, obtained from constant speed driving tests performed within a range of speed, is modeled as an au-toregressive model whose parameters are estimated by using a standard method. Finally, the parame-ters obtained for different driving speeds are interpolated based on the varying driving speed to yield a time-varying autoregressive model. To model a full band road noise, audible frequency range is divided into an octave band using a wavelet filter bank, and the road noise in each octave band is modeled. * 기 호 설 명 a k : k 번째 모수 e ( t ): 스토캐스틱 시계열 모형의 잔여 n a : 자기회귀 모형의 차수 u ( t ): 주행 속도