摘要
传统用于壁板结构低频减振的动力吸振器(dynamic vibration absorber,DVA)设计方法需要针对每一阶结构模态单独设计DVA,难以应用于模态密集的复杂薄壁结构。基于激励相关代表基的分布式DVA设计方法能够针对多阶密集模态开展DVA设计,然而仍然需要预先已知结构模态信息。该研究提出一种基于应变响应的壁板结构分布DVA设计方法,由实测结构应变响应的主成分分析结果直接获取结构稀疏模态以及与密集模态对应的激励相关代表基,实现基于结构响应直接设计含密集模态薄壁结构的分布式DVA。基于重频特征的四边夹持方板结构开展试验研究。搭建了试验平台,基于方板上的实测应变响应设计了分布式DVA,并开展了附加DVA前后壁板结构的振动试验,验证了该方法的有效性。该研究旨在为大型薄壁结构低频减振提供一种新的DVA设计方法。
Traditional design methods for dynamic vibration absorbers(DVAs)used in low-frequency vibration reduction of panel structures require separate design for each structural mode,they are difficult to apply in complex thin-walled structures with dense modes.The distributed DVA design method based on excitation-related representative bases can be suitable for multiple dense modes,and still require prior knowledge of structural modal information.Here,a strain-response-based distributed DVA design method was proposed for panel structures.By directly extracting sparse structural modes and excitation-related representative bases corresponding to dense modes from principal component analysis results of measured structural strain responses,direct design of distributed DVAs for thin-walled structures with dense modes was realized based on structural responses.Test study was conducted for a square panel structure with 4-edge clamping and repetitive frequency features.A test platform was built,and distributed DVAs were designed based on measured strain responses of the square panel.Vibration tests were conducted for panel structure before and after adding designed DVAs to verify the effectiveness of the proposed method.This study aimed to provide a novel DVA design approach for low-frequency vibration reduction of large thin-walled structures.
作者
林敬淇
周江贝
谢容川
吴邵庆
LIN Jingqi;ZHOU Jiangbei;XIE Rongchuan;WU Shaoqing(Department of Engineering Mechanics,School of Civil Engineering,Southeast University,Nanjing 211189,China;National Key Laboratory of Strength and Structural Integrity,Aircraft Strength Research Institute of China,Xi’an 710065,China;Jiangsu Key Laboratory of Mechanical Analysis for Infrastructure and Advanced Equipment,Nanjing 211189,China)
出处
《振动与冲击》
北大核心
2026年第5期208-216,共9页
Journal of Vibration and Shock
基金
装备预先研究领域基金项目(80910020402)
强度与结构完整性全国重点实验室开放基金(ASSIKFJJ202303005)。
关键词
壁板结构
低频减振
分布式动力吸振器(DVA)
应变响应
主成分分析
试验验证
panel structure
low frequency vibration reduction
distributed dynamic vibration absorbers(DVAs)
strain response
principal component analysis
test verification
