Road Noise Evaluation by Sound Quality Simulation Module 2020-01-1275
Objective evaluation of sound quality is the bridge connecting sound pressure level (SPL) and auditory sensation. The modified algorithm was proposed for objective evaluation parameters of sound quality (including loudness, sharpness and articulation index), considering the acoustic transfer functions of external ear, middle ear and inner ear to enhance the algorithm integrity and accuracy. The sound quality simulation (SQS) module was developed in accordance to the optimized algorithm. For evaluating the sound quality of road noise of an SUV, the full-spectrum interior noise was calculated by integrating finite-element method (FEM), FE-SEA method, and statistical energy analysis (SEA) for low frequency (20~300 Hz), middle frequency (300~500 Hz), and high frequency (above 500 Hz), respectively. The simulated and tested full-spectrum interior SPLs were correlated. The general deviations were below 3dB at each one-third central frequency. The sound quality of road noise was evaluated by SQS. The deviations of the simulated and tested loudness, sharpness, and articulation index were generally below 5%, which proved the accuracy of the optimized algorithm for the objective evaluation parameters of sound quality. The filtering technique was integrated in SQS to determine the dominant contribution frequency for sound quality evaluation, which was an efficient optimization tool to avoid over-engineering. Several cases were implemented to optimize the loudness, sharpness, and articulation index, which were validated by experiment.
Perry Gu, Jie Mao, Zhidong Chen, Zhi Ding, Lei Cheng, Zhenying Zhu, Hong Peng