摘要
基于模态叠加法和声振耦合理论建立了加筋板结构与矩形声场间的耦合模型,推导了反映加筋板结构与矩形声场模态间耦合强度的传递因子公式,研究了加筋板结构与矩形声场模态间耦合特性,以及点力到筋的距离对耦合系统响应的影响。结果表明:加筋后板结构与矩形声场模态间耦合选择性除了在与筋平行的轴向不会改变外,在其他轴向的耦合选择性则会改变;加筋会改变模态间耦合强度,但由于加筋导致耦合选择性改变而新增加的耦合强度较小;此外,由于加筋导致的板振动能量和矩形声场声势能的衰减程度与点力到筋间的距离密切相关,当点力直接作用在筋上或者点力到筋的距离小于板的1/4弯曲波长时,振动能量和声势能在较广的频段都能出现衰减现象,反之则不会出现衰减现象。
The coupled system model between stiffened plate and rectangular cavity is built using modal expansion method and vibro-acoustic coupling theory.Transfer factors between modes of ribbed plate and rectangular cavity,which are used to describe the coupling strength between them,are developed.Then,the ribbing effect on the coupling characteristics is conducted.Based on the coupled model,the effect of rib location on response of coupled system is conducted.The results show that the coupling selection is only satisfied on the axis which is parallel to the rib.The coupling strength is changed after beam insertion.However,the coupling strength which is induced by the variation of coupling selection after beam insertion is small.The response of ribbed plate and rectangular cavity is close related to the distance between the point force and rib compared with the case of uniform plate.When the point force directly acts on the rib or the distance between the rib and point force is close,the reduction of plate vibration energy and acoustic potential energy appear among many frequency bands.However,there will be no reduction phenomenon when the distance between the point force and rib is large.
作者
程传峰
金明
王项如
王园
朱英霞
王健
盘朝奉
Cheng Chuanfeng;Jin Ming;Wang Xiangru;Wang Yuan;Zhu Yingxia;Wang Jian;Pan Chaofeng(Anhui XMAX New Energy Technology Co.,Ltd.,Anqing City,Anhui Province 246001,China;Anhui ARN Group Co.,Ltd.,Anqing City,Anhui Province 246001,China;School of Mechanical Engineering,Jiangsu University,Zhenjiang City,Jiangsu Province 212013,China;Automotive Engineering Research Institute,Jiangsu University,Zhenjiang City,Jiangsu Province 212013,China)
出处
《农业装备与车辆工程》
2022年第2期24-29,共6页
Agricultural Equipment & Vehicle Engineering
基金
江苏省自然科学基金面上项目(BK20171300)。
关键词
加筋板
声振耦合
耦合系数
传递因子
ribbed plate
vibro-acoustic coupling
coupling coefficient
transfer factor
