Reduction of vibration by periodically stitched sandwich panel  

作　　者：Nan LI Mabrouk BEN TAHAR Liang MENG Fusheng SUI 

机构地区：[1]Key Laboratory of Noise and Vibration Research,Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190,China [2]Sorbonne Universites,Universitede Technologie de Compiegne,CNRS,UMR 7337 Roberval,Centre de Recherche Royallieu,CS 60319,Compiegne Cedex 60203,France [3]State IJR Center of Aerospace Design and Additive Manufacturing,Northwestern Polytechnical University,Xi’an 710072,China [4]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Chinese Journal of Aeronautics》2021年第7期39-49,共11页中国航空学报（英文版）

摘　　要：This work reveals that the addition of periodically distributed stitches to sandwich structure enables a significant reduction of vibration in stop-band and this new functionality is systematically investigated.Firstly,a finite element model which is capable of taking into consideration the three layers of the sandwich as well as the stitches is developed.The diagram of dispersion is calculated by applying Floquet-Bloch theorem to the boundaries of unit cell.With properly chosen properties of stitches,a stop-band for flexural wave is observed.This stop-band is further confirmed by the forced response of a large stitched sandwich panel under point excitation.The level of vibration in the stop-band is significantly reduced.The influence of the stitch rigidity and density on upper and lower limits of stop-band is also examined,which confirms that stitched sandwich can be tuned to mitigate vibration in a certain frequency band with appropriate stitch properties.These investigations have demonstrated the potential application of stitched sandwich in the area of vibration reduction.

关 键 词：Composite structure Parametric study Periodic structures Reduction of vibration Stitched sandwich 

分 类 号：O328[理学—一般力学与力学基础]