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高速列车风挡噪声控制技术仿真研究
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Abstract:
近年来随着高速列车速度的不断提高，气动噪声问题日益严重，车间连接风挡为列车的主要气动噪声源，对其采取降噪措施可以有效降低车内噪声。本文通过实车噪声试验，明确风挡区域车内外噪声状况；建立含有风挡区域的流体仿真模型以及内外风挡声腔之间的声学仿真模型，采用LES大涡模拟获得风挡区域表面声源，仿真研究了风挡端墙添加吸声材料后内外风挡声腔内的降噪效果。
With the increasing speed of high-speed trains in recent years, the problem of aerodynamic noise is becoming more and more serious, and it is particularly important to design noise reduction for the workshop-connected windscreen, which is the main aerodynamic noise source of trains. Through real vehicle noise tests, the noise conditions inside and outside the vehicle in the windscreen area are clarified; a fluid simulation model containing the windscreen area and an acoustic simulation model between the inner and outer windscreen cavities are established, the surface dipole sound source in the windscreen area is obtained using LES large vortex simulation, and the noise reduction effect inside the inner and outer windscreen cavities is studied by simulation after adding sound-absorbing materials to the end walls.
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