关键词: 声品质；半阶次振动；传递路径；发动机悬置；噪声粗糙

Abstract: Aiming at the sound quality problem of a passenger car's rough interior noise during low-throttle acceleration, firstly analyze the spectral characteristics of the noise time domain data, and find that the cause of the rough noise is the half order noise pressure amplitude in the car value modulation. Secondly, through the transmission path test analysis, results show that the half-order excitation source in the vehicle is the half-order vibration of the engine, and the main transmission path is the powertrain mount. Finally, by increasing the sound insulation of front wall, optimizing the stiffness of the suspension and reducing the hardness of the air-conditioning tube vibration isolation cushion, half-order characteristics of the noise in the car are significantly reduced, and the sound quality of the accelerated sound is effectively improved.

Key words: Sound quality; Half order vibration; Transmission path; Engine mount; Rough noise