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针对某挖掘机驾驶室,建立驾驶室结构有限元模型、声学有限元模型以及声-固耦合有限元模型,进行驾驶室结构模态分析、声学模态分析,以及声-固耦合模态分析。利用基于声-固耦合有限元的模态叠加法计算驾驶室声学灵敏度,实车工况下测试驾驶员右耳位置处的声压值。识别出主要噪声频率,对此频率处驾驶室面板声学贡献量进行分析,找出贡献显著的面板,为挖掘机驾驶室的减振降噪提供依据。
A cab structure finite element model, acoustic finite element model and acoustic-solid coupling finite element model are established for the cab of an excavator. The structural modal analysis, acoustic modal analysis and acoustic-solid coupling modal analysis of the cab are established. The acoustical sensitivity of the cab was calculated by using modal superposition method based on the acoustic-solid coupling finite element method, and the sound pressure value at the position of the right ear of the driver under actual vehicle working condition was measured. The main noise frequency is identified, and the contribution of cab panel acoustics at this frequency is analyzed to find the panel that contributes significantly to provide the basis for vibration and noise reduction of excavator cab.