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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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Finite Elements Analysis of High - speed Train Wind Noise in Lighthill’s Acoustic Analogy
YANG Xiao-Yu;Ya-jun CHENG;Feng-hua LIU
   2011, 31 (4): 80-84.   DOI: 10.3969/j.issn.1006-1355-2011.04.019
Abstract （2223）            Save
With the constant increase of the trains’ speed, the aerodynamic noise gradually succeeds the traditional track noise and becomes the main noise source of the high-speed trains. In this paper, a hybrid CFD/CAA wind noise model for the high speed trains based on Lighthill’s analogy is constructed utilizing a professional finite elements acoustic simulator ACTRAN-Aeroacoustics. Numerical results of fluid and acoustic fields are reported and discussed. Some important issues for further development of the simulation model are discussed. The simulation results show that there are three dominant locations for the aerodynamic noise sources which depend on the shape of the train. With the use of this model, the influence of the train’s shape on the wind noise can be analyzed, and the optimization for low noise design of the train can be realized.
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