Investigation on the broadband dynamic response characteristics of stitched sandwich structure
MA Wenyi1,2, CHEN Qiang1,2, LI Yanbin1,2, CHENG Weiwei3
1.School of Mechanical Engineering, Southeast University, Nanjing 211189, China;
2.Engineering Research Center of Aerospace Machinery, Nanjing 211189, China;
3.Beijing Aerospace Technology Institute, Beijing 100074, China
Abstract:The stitched sandwich structure used in hypersonic aircraft could face high-level broadband aerodynamic noise load during service. The analysis of its broadband dynamic response characteristics is the key to aircraft structure design. A prediction method of wideband dynamic response of stitched sandwich structure based on wave finite element (WFE) theory was derived. The wave propagation characteristics of the stitched sandwich structure in different frequency bands were investigated. The contributions of different waves to the broadband dynamic response were evaluated. The effects influence of stitch density and the thickness of the sandwich layer on the broadband dynamic response characteristics were discussed. Simulation The results indicate show that the prediction method based on wave finite element (WFE) theory can efficiently and accurately predict the broadband dynamic response of the structure. The integrity between the panel and the core layer of the stitched sandwich structure could be significantly enhanced by introducing the sutures. The amplitude of the mid-and high-frequency response is sharply highly reduced and the local mode is significantly suppressed.
Key words: Stitched sandwich structure;Wave Finite Element (WFE);Dispersion relationship;Wave propagation characteristics;Broadband dynamic response
马文漪1,2,陈强1,2,李彦斌1,2,程危危3. 缝合式夹芯结构宽频动力学响应特性研究[J]. 振动与冲击, 2022, 41(21): 333-346.
MA Wenyi1,2, CHEN Qiang1,2, LI Yanbin1,2, CHENG Weiwei3. Investigation on the broadband dynamic response characteristics of stitched sandwich structure. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(21): 333-346.
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