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国家自然科学基金(50575222)

作品数:7 被引量:79H指数:4
相关作者:刘耀宗郁殿龙温激鸿赵宏刚温熙森更多>>
相关机构:国防科学技术大学更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划更多>>
相关领域:理学机械工程一般工业技术更多>>

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含有周期球腔的黏弹性覆盖层消声性能分析被引量:18
2007年
利用散射矩阵法分析了单个球状空腔在黏弹性橡胶中的Mie散射特性以及振动模式.以此为基础,利用多重散射法分析了不同背衬条件下,含有单层周期球状空腔的橡胶覆盖层(厚度为8mm)的消声性能.结果表明,单个球腔的径向共振对覆盖层的低频消声性能有重要贡献,覆盖薄层在共振区具有良好的消声性能.最后,设计了双层消声覆盖层(厚度为20mm),有效拓展了消声带宽.
赵宏刚刘耀宗温激鸿郁殿龙温熙森
关键词:MIE散射消声材料声子晶体
Comparison of the mechanism of gap formation for tri- and bi-component phononic crystal
2008年
Using an exact Mie scattering solution, this paper investigates the mode conversions during the Mie scattering of a single bi- or one-component sphere in unbounded epoxy. Then the formation mechanism of the first complete gap in the corresponding tri- or bi-component phononic crystal is investigated by the multiple-scattering method. It is shown that the heavy density of the scatterer plays an essential role in the Mie resonance and the formation of the gaps for both types of the phononic crystals. For the tri-component phononic crystal, the gap is mainly induced by the Mie resonance of the single scatterer. For the bi-component phononic crystal, the transverse wave (by mode-conversion during the Mie scattering under a longitudinal wave incidence) is modulated by the periodicity and governed by the Bloch theory, which induces the gap cooperatively.
赵宏刚温激鸿刘耀宗郁殿龙王刚温熙森
基于局域共振机理的周期弹簧振子系统带隙特性研究
本文在弹簧振子系统中引入声子晶体理论中的局域共振带隙机理,得出其弯曲振动的带隙特性,并使系统的周期尺寸比禁带内振动波长低两个量级,成功实现了'小尺寸控制大波长'的目的。论文主要通过改变系统的弹簧和振子的参数,分析其对带隙...
刘竞文温激鸿郁殿龙温熙森
关键词:弹簧振子带隙
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Coupled flexural-torsional vibration band gap in periodic beam including warping effect
2009年
The propagation of coupled flexural-torsional vibration in the periodic beam including warping effect is investigated with the transfer matrix theory. The band structures of the periodic beam, both including warping effect and ignoring warping effect, are obtained. The frequency response function of the finite periodic beams is simulated with finite element method, which shows large vibration attenuation in the frequency range of the gap as expected. The effect of warping stiffness on the band structure is studied and it is concluded that substantial error can be produced in high frequency range if the effect is ignored. The result including warping effect agrees quite well with the simulated result.
方剑宇郁殿龙韩小云蔡力
薄板状周期栅格结构中弹性波传播特性研究被引量:21
2007年
相位常数面可以描述特定频率、特定结构中波的传播方向及传播区域.将相位常数面这一分析方法应用于薄板状周期栅格结构中弹性波传播特性的研究,采用集中质量法计算了周期栅格结构的相位常数面,得到了直观的三维能带结构图.相位常数面可以用二维等高线图描述,通过计算等高线上每一点的法线方向,得到了在特定通带频率下弹性波的传播方向及传播区域.这些研究对于通带频率范围内的弹性波传播特性具有重要意义.
温激鸿郁殿龙王刚赵宏刚刘耀宗
关键词:声子晶体弹性波带隙
Formation mechanism of the low-frequency locally resonant band gap in the two-dimensional ternary phononic crystals被引量:4
2006年
The low-frequency band gap and the corresponding vibration modes in two-dimensional ternary locally resonant phononic crystals are restudied successfully with the lumped-mass method. Compared with the work of C. Goffaux and J. Sánchez-Dehesa (Phys. Rev. B 67 14 4301(2003)), it is shown that there exists an error of about 50% in their calculated results of the band structure, and one band is missing in their results. Moreover, the in-plane modes shown in their paper are improper, which results in the wrong conclusion on the mechanism of the ternary locally resonant phononic crystals. Based on the lumped-mass method and better description of the vibration modes according to the band gaps, the locally resonant mechanism in forming the subfrequency gaps is thoroughly analysed. The rule used to judge whether a resonant mode in the phononic crystals can result in a corresponding subfrequency gap is also verified in this ternary case.
王刚刘耀宗温激鸿郁殿龙
充液周期管路的轴向振动带隙特性被引量:20
2009年
充液管路的固液耦合振动广泛存在于各种工程领域中,对其振动控制进行研究具有重要意义。将声子晶体思想引入到管路结构设计中,将管壁设计成周期性结构,可以利用带隙特性实现管路的振动控制。利用平面波展开法,计算固液耦合条件下的周期管路结构轴向振动能带结构。计算表明,周期管路结构的轴向振动存在振动带隙,液体耦合效应使振动带隙的频率范围降低。同时分析泊松耦合、管壁厚度等因素对带隙频率范围和宽度的影响。充液周期管路结构的振动带隙特性为管路的振动控制提供了一条新的技术途径。
郁殿龙温激鸿刘耀宗邱静温熙森
关键词:声子晶体振动带隙
Accurate evaluation of lowest band gaps in ternary locally resonant phononic crystals被引量:16
2006年
Based on a better understanding of the lattice vibration modes, two simple spring-mass models are constructed in order to evaluate the frequencies on both the lower and upper edges of the lowest locally resonant band gaps of the ternary locally resonant phononic crystals. The parameters of the models are given in a reasonable way based on the physical insight into the band gap mechanism. Both the lumped-mass methods and our models are used in the study of the influences of structural and the material parameters on frequencies on both edges of the lowest gaps in the ternary locally resonant phononic crystals. The analytical evaluations with our models and the theoretical predictions with the lumped-mass method are in good agreement with each other. The newly proposed heuristic models are helpful for a better understanding of the locally resonant band gap mechanism, as well as more accurate evaluation of the band edge frequencies.
王刚邵丽晖刘耀宗温激鸿
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