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摘要:Researches in Acoustic Black Hole(ABH) structures are attractive for potential applications in broadband vibration suppression and wave manipulation. The remarkable functions of an ABH element are limited below the cut-on frequency, above which the broadened ABH effect can be effectively obtained. The mid-to-low application challenges the ABH structure without large dimensions. In this work, the band structures of periodical two-dimensional(2 D) ABH without additional damping material were investigated. The simulation results show that periodic 2 D ABHs can achieve directional flexural wave bandgaps(DFBGs) below the cut-on frequency of ABH cell.The analysis results of eigenmodes show that the generation of multiple DFBGs is dominated by the ABH-induced local resonance at multiple frequencies. The effect of lattice constant and key parameters of the ABH on the DFBG is also explored to indicate the bandgap adjustment rules. The results show a trend of shifted and partially overlapping DFBG for different parameters. The graded ABH plate strip is then proposed based on the trend of DFBG with gradually varied parameters.The vibration transmission of plate strips with different graded ABH lattice/cell is numerically investigated. The results show that the bandgap can be broadened through the graded design. The small graded increment of design parameters achieves continuous attenuation regions, and on the contrary, leads to narrow individual attenuation regions separated by vibration peaks or even reduces the attenuation band. The bandgap analysis as well as the strategies for bandgap adjustment and broadening enrich the existing knowledge on periodic 2 D ABH structures and offers a design guideline of bandgap behaviors in a 2 D ABH plate strip.
会议名称:

第八届国际振动工程会议

会议时间:

2021-07-24

会议地点:

中国上海

  • 专辑:

    工程科技Ⅱ辑

  • 专题:

    工业通用技术及设备

  • DOI:

    10.26914/c.cnkihy.2021.017265

  • 分类号:

    TB53

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