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Study and Improvement on Sound Quality of Car’s Interior Noise
LIU Zhi-en;;ZHAO Nan-nan;;HOU Xian-jun;;YUAN Shou-li;
   2011, 31 (5): 45-48.   DOI: 10.3969/j.issn.1006-1355-2011.05.011
Abstract （2043）            Save
Aiming at the interior abnormal noise during idling and rapid acceleration of a car, the main noise sources, which are the second order and resonance noises, are identified by the tailpipe noise measurement and modal test respectively. A resonant chamber is designed to lower the sound level of the second order and resonant frequencies. A pinch-can structure is used to reduce the high frequency flow noise. And the tailpipe noise at transient accelerating is simulated by GT-Power software. The test results show that the maximum values of transient tailpipe noises at idling and rapid acceleration can be reduced by 11.7 dB(A) and 8 dB(A) respectively.
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Performance Simulation and Noise Reduction of Engine Intake System
HOU Xian-jun;;ZHU Mei-ying;; LIU Zhi-en;;YAN Fu-wu;;YANG Xiao
   2011, 31 (5): 42-44.   DOI: 10.3969/j.issn.1006-1355-2011.05.010
Abstract （2659）            Save
Performance simulation and optimization of noise reduction of engine’s intake system are researched in this paper. The models for simulating the intake system performance are established by GT-Power. Due to the problem that the noise in inlet port is higher than the target noise at some individual rotary speeds under the Sound Pressure Level (SPL) of order, the volume of air-filter is increased, and the parameters of Helmholtz resonator and 1/4 wavelength pipe are adjusted. The results of simulation verify that after optimization the total SPL and the SPL of order in the inlet port are lower than the target noise, and the pressure loss is less than 2.5kPa, which means that the engine noise is reduced significantly.
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