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摘要:Due to the periodic arrangement of unit patterns, phononic crystals(PCs) present novel behaviors in wave manipulation. Propagation of wave is forbidden within some specific frequency ranges which are so called bandgaps. Based on this, defect mode, negative refraction,mode conversion, and some other characters are further proposed for vibration control. When the periodicity of PC is broken, there exist some flat dispersion curves, i.e. defect modes, within bandgaps. Group velocity of the wave is nearly zero so that the energy is concentrated around the defect structure at these frequencies. This character could be employed for vibration energy harvesting and other applications. The wave accumulation behavior of defect mode is primarily determined by the configuration of defects. Meanwhile, it is also tuned by external factors, such as temperature. For binary PC beams, because of the softening effect of thermal load on structures,bandgaps and defect modes for flexural wave shift toward the lower frequency range simultaneously as temperature is elevated. Meanwhile, different defect modes present unequal responses to thermal variation. Defect modes, which are generated by hard defects, emerges from the lower edge of the bandgap. They are more sensitive to temperature changes as showing larger reduction ratio of defect frequency in thermal environment. On the contrary, defect modes generated by soft defects are more stable against to temperature. When there are two defects within the PC beam, the interaction between them is strong as their defect frequencies are close.Temperature change will present evident influence on splitting of defect frequency, even leads to degeneration to one of the two defect modes. When the frequency difference between the two defects gets larger, they gradually decouple and performs as two independent defects. Thermal environment only reduces their frequencies without causing frequency splitting.
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Ⅰ辑

  • 专题:

    化学

  • DOI:

    10.26914/c.cnkihy.2021.017274

  • 分类号:

    O735

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