A Study on Sound Transmission Loss Measurement of Vehicle Components

The measurement method of Sound Transmission Loss (STL) both in the reverberation room and the semi-anechoic room at the vehicle component level is presented. The sound intensity method was used to measure the STL, and the Statistical Energy Analysis (SEA) models were used to predict the acoustic performance of the system. Since the dash and the floor system mainly affect the NVH performance in the car compartment, the analysis process requires detailed SEA modeling and accurate measurement in these parts. The measured data was in good agreement with the predicted data obtained by using SEA model, and the results were helpful in determining the reliability of the measurement method and the SEA modeling.