A method to simulate wind noise in cars under time-varying wind conditions

摘要

To control wind noise in cars and increase customer satisfaction, better models of wind noise perception are desired. Psychoacoustic tests were conducted to develop a refined acceptance model for stationary wind noise. The goal is now to develop acceptance models for wind noise under unsteady wind conditions, because cars that are acceptable under steady wind conditions may be unacceptable under unsteady wind conditions. To develop an acceptance model for time-varying wind noise, it is first necessary to identify the main characteristics of the non-stationary sounds, and to develop a method of systematically controlling these so that robust listening studies can be designed. A method for simulating unsteady wind noise from stationary wind-tunnel recordings, which is based on an existing approach, has been developed. Stationary wind noise recordings are amplitude modulated based on the speed and direction of the external airflow incident on the vehicle. The effects of the wind variations are used to design a series of FIR filters, and a method for transitioning from one filter to the next during filtering has been developed. Recordings under non-stationary wind conditions are compared to the time-varying modifications to the stationary wind-tunnel recordings to determine the realism and accuracy of the simulations.