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为了分析结构振动引起的声辐射,建立了叉车驾驶室结构和声学有限元模型,以接近实际工况下的振动位移为边界条件,计算了叉车驾驶室关键场点声压,并与实际场点测试情况对比,检验了有限元模型的正确性。进而研究了几种工况下驾驶室关键点的振动与声学特性。最后,在此有限元模型基础上对振动较大的板件进行结构修改和表面阻尼处理。经仿真计算对比,降低了特定点处的声压,为噪声控制提供了依据。
In order to analyze the acoustic radiation caused by structural vibration, the structure and acoustics finite element model of the cab of the forklift truck are established. The vibration displacement of the forklift truck is calculated as the boundary condition close to the actual working condition. Contrast test conditions, verify the correctness of the finite element model. Then the vibration and acoustic characteristics of the cab key points under several conditions are studied. Finally, on the basis of this finite element model, the structural vibration and surface damping of the plate with large vibration are modified. Compared with the simulation calculation, the sound pressure at a specific point is reduced, which provides the basis for noise control.