A dispersion-based impact identification method:mechanical model and experimental verification
刘子尚 1陈天宇 2张坤 1魏延鹏 3郭雅悰 3魏炳忱1
扫码查看
点击上方二维码区域，可以放大扫码查看
作者信息
1. 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
2. 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
3. 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
External transient impact loads widely exist in the service environment of various engineering structures,and urgent en-gineering 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 dis-persion 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.
万方数据