刘宏业, 金娇延, 范彦平, 马莎, 刘增华, 何存富. 单水滴附载的Lamb波宽频Chirp激励成像研究[J]. 北京工业大学学报, 2018, 44(5): 749-756. DOI: 10.11936/bjutxb2017060001
    引用本文: 刘宏业, 金娇延, 范彦平, 马莎, 刘增华, 何存富. 单水滴附载的Lamb波宽频Chirp激励成像研究[J]. 北京工业大学学报, 2018, 44(5): 749-756. DOI: 10.11936/bjutxb2017060001
    LIU Hongye, JIN Jiaoyan, FAN Yanping, MA Sha, LIU Zenghua, HE Cunfu. Research on Lamb Wave Imaging of a Sessile Water Droplet With Chirp Excitation[J]. Journal of Beijing University of Technology, 2018, 44(5): 749-756. DOI: 10.11936/bjutxb2017060001
    Citation: LIU Hongye, JIN Jiaoyan, FAN Yanping, MA Sha, LIU Zenghua, HE Cunfu. Research on Lamb Wave Imaging of a Sessile Water Droplet With Chirp Excitation[J]. Journal of Beijing University of Technology, 2018, 44(5): 749-756. DOI: 10.11936/bjutxb2017060001

    单水滴附载的Lamb波宽频Chirp激励成像研究

    Research on Lamb Wave Imaging of a Sessile Water Droplet With Chirp Excitation

    • 摘要: 为研究水滴附载效应对Lamb波传播特性的影响,基于Lamb波与不连续介质相互作用的远场散射原理,采用稀疏传感器阵列对单水滴附载的远场散射信号进行试验监测,研究宽频Chirp激励方法和窄带响应的滤波提取算法,优化选取对表面水滴敏感的Lamb波模态和成像中心频率、调制周期数,最终实现对不同体积水滴的椭圆算法定位成像.结果表明:水滴附载对Lamb波A0模态的传播特性影响显著,即使微小的单水滴附载亦会对监测信号产生较大影响.椭圆算法可实现单水滴附载的定位成像,成像质量除受水滴体积大小影响外,成像颜色带宽的设置亦与成像质量息息相关.

       

      Abstract: In order to study the effects of water droplet on the Lamb wave propagation, based on the principal of Lamb wave far-field scattering that generated from the interaction of Lamb wave and discontinuity of medium, an experimental monitoring on the far-field scattering signals of a sessile water droplet was implemented in this paper by using the sparse transducer array. Then the method of broadband chirp excitation and filtering extraction algorithm of narrow bandwidth response were studied, and an optimum selection of Lamb wave mode sensitive to surface water droplet and the center frequency as well the number of cycles was made. Finally a sessile water droplet of different volumes with the ellipse algorithm was located and imaged. The results indicate that the presence of a sessile water droplet has a significant influence on the propagation of Lamb wave A0 mode where even small amounts of single water droplet can obviously affect the monitoring signals. The ellipse algorithm can locate and image a sessile water droplet, and the imaging color bandwidth is closely related to the imaging quality besides the size of water droplets.

       

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