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Noise Simulation and Optimization of Automotive’s Intake System

SHI Yan;ZHANG Jian-ping;LIU Peng

2012, 32 (3): 129-132. DOI: 10.3969/j.issn.1006-1355.2012.03.030

Abstract （1521）

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Intake system of engine is one of the main noise sources of an automobile. In this paper, the acoustic transmission loss of the engine intake system was simulated by CAE, and the defects in its noise silencing were found. With the use of perforated muffler, the intake system was optimized. The defects in the noise silencing were removed and a favorite effect was reached.

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Study on Simulation Method for Sound Quality Evaluation of Vehicle Exhaust Noise

SHI Yan;;SHU Ge-qun;BI Feng-rong

2011, 31 (5): 62-66. DOI: 10.3969/j.issn.1006-1355-2011.05.015

Abstract （1839）

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Subjective evaluation of vehicle’s exhaust noises is executed by paired comparison jury test, and the sound quality prediction model of vehicle exhaust noise is established based on back-propagation (BP) neural network. The acoustic characteristic of muffler is obtained through the computational fluid dynamics simulation, and the frequency spectrum of the exhaust noise of the vehicle with muffler fitted is derived. The objective parameters of the simulated exhaust noise, such as loudness, sharpness, roughness and so on, are calculated based on psychoacoustics theory. Then, the sensory pleasantness is simulated by importing these objective parameters into the sound quality prediction model which is established previously. Thus, the whole numerical simulation method for sound quality evaluation of vehicle’s exhaust noise is fulfilled. The reliability of the simulation method is verified by comparison of the simulation results with the experimental data.