摘要
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。
A vibrational model of a stiffened cylindrical shell coupled with a ribbed plate under multi-point excitations is established based on an improved sub-structure receptance method. The theoretic model is validated by ANSYS and then utilized to analyze the effects of the distributional direction and location of the multi-point excitations on the vibration of the system. The following conclusions have been drawn from this study： 1） For an excitation source with a constant total amplitude, the vibrational response transmitted from the plate to the shell under multi-point excitations is much smaller than that under single point excitation. 2） The vibrational energy transmitted from the plate to the shell can be effectively reduced provided that the multi-point excitations are located along the center line of the plate and vertically to the direction of the coupling edge. Therefore, in engineering practice, for a piece of equipment that can be considered as a constant excitation source, it is beneficial for improving the acoustic characteristics of the system by fixing it with multiply points along the center line of the plate and vertically to the plate/shell coupling edge.
出处
《工程力学》
EI
CSCD
北大核心
2013年第11期239-244,共6页
Engineering Mechanics
关键词
振动
加筋板壳耦合结构
多点激励
分布形式
子结构导纳法
vibration
stiffened plate and shell coupled structure
multi-point excitations
distributional form
sub-structure receptance method
