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该文基于改进的子结构线导纳方法,建立了多点激励下加筋板壳耦合结构的振动模型。首先对理论模型采用ANSYS进行了验证;进而使用该模型分析了多点激励的分布方向和位置对结构振动响应的影响。研究表明:当激励源的总幅值恒定时,多点激励下从铺板传递到壳体的振动响应小于单点激励的情况;将多点激励沿垂直于板壳衔接线方向分布且位于铺板的中心线上,可以有效地降低从铺板传递到壳体的振动响应。实际工程中,对于激励源恒定的机械设备,应采用多点方式将其沿垂直于铺板与壳体衔接线的方向安装在铺板的中心线上,以提高系统的声学性能。
Based on the improved sub-structure linear admittance method, a vibration model of stiffened plate-shell coupled structures under multi-point excitation is established. Firstly, the theoretical model was verified by ANSYS. Then the model was used to analyze the influence of the distribution direction and position of multi-point excitation on the vibration response of the structure. The results show that when the total amplitude of the excitation source is constant, the vibration response transmitted from the decking to the shell under multi-point excitation is smaller than that of the single-point excitation. The multi-point excitation is distributed along the direction perpendicular to the shell connection and located on the decking On the center line, the vibration response transmitted from the plank to the housing can be effectively reduced. In practical engineering, for mechanical equipment with constant excitation source, multi-point method should be adopted to install it on the centerline of the plank along the direction perpendicular to the connecting line between plank and shell to improve the acoustic performance of the system.