A dispersion-based impact identification method:mechanical model and experimental verification  

一种基于弥散的冲击识别方法:力学模型和实验验证

作　　者：Zishang Liu Tianyu Chen Kun Zhang Yanpeng Wei Yacong Guo Bingchen Wei 刘子尚;陈天宇;张坤;魏延鹏;郭雅悰;魏炳忱(Key Laboratory of Microgravity(National Microgravity Laboratory),Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;School of Engineering Science,University of Chinese Academy of Sciences,Beijing 100049,China;Key Laboratory for Mechanics in Fluid Coupling Systems,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]Key Laboratory of Microgravity(National Microgravity Laboratory),Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China [2]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China [3]School of Engineering Science,University of Chinese Academy of Sciences,Beijing 100049,China [4]Key Laboratory for Mechanics in Fluid Coupling Systems,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Acta Mechanica Sinica》2024年第7期80-91,共12页力学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.12272392 and 11790292);the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB22040303);the Youth Innovation Promotion Association of the Chinese Academy of Sciences(Grant No.2022020).

摘　　要：External transient impact loads widely exist in the service environment of various engineering structures,and urgent engineering and military application requirements call for research on the theory and method of impact identification.This manuscript proposes a method to identify the impact event.By employing the dispersive property of wave propagation through the waveguides,a dispersion-based average power spectral density(PSD)curve for quantitative representation of the dispersion is established,and its evolution law is investigated to apply the identification of impact events.The critical parameters of the average PSD curve are obtained by analyzing the response of the structure from the perspective of mechanics.The effectiveness of this method is verified through the development of the triple-successive-impact split Hopkinson bar and the triple-successive-impact experiment.Through the method proposed in this manuscript,a kind of impact identification under multiple impact loads,which is not convenient to measure directly by the sensor,is realized,especially in the case of highly transient external impact.外部瞬态冲击载荷广泛存在于多种工程结构的服役环境中,迫切的工程和军事应用需求要求对冲击识别的理论和方法进行研究.这篇文章中提出了一种冲击识别方法.通过利用应力波在传播过程中的弥散特性,建立了基于弥散的平均功率谱密度曲线用于弥散过程的定量表示.此外还研究了该曲线的演化规律,将其应用于冲击载荷的识别.通过从力学角度分析结构的响应,得到了平均功率谱密度曲线的临界参数.通过三次连续撞击霍普金森杆实验平台开展三次连续撞击实验,验证了该方法的有效性.通过本文提出了方法,实现了在传感器不方便直接测量环境下的多次冲击载荷识别,特别是在高瞬态的外部冲击的情况下.

关 键 词：Structural impact DISPERSION Structure vibration WAVEGUIDES Impact identification 

分 类 号：O3[理学—力学]