低频宽带声学超表面的声能聚焦吸声机理及运用
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- 英文论文题名：Studies on the mechanism and application of the low frequency broadband acoustic surface
- 论文作者：曹松华 ; 吴九汇 ; 李竞 ; 张永燕 ; 罗晓康
- 英文论文作者：Cao Songhua ; Wu jiu-hui ; Li jing ; Zhang Yongyan ; Luo Xiaokang
- 年：2016
- 作者机构：西安交通大学机械工程学院;西安交通大学机械结构强度与振动国家重点实验室;
- 论文关键词：反向号角 ; 二次方模型 ; 声能聚焦 ; 吸声尖劈
- 英文论文关键词：Reverse Horn ; Quadratic Model ; Energy Focusing ; Absorption Wedge
- 会议召开时间：2016-07-28
- 会议录名称：第二十七届全国振动与噪声应用学术会议论文集
- 语种：中文
- 分类号：TB535.1
- 学会代码：ZDZD
- 会议名称：第二十七届全国振动与噪声应用学术会议
- 会议地点：中国黑龙江哈尔滨
- 主办单位：中国振动工程学会振动与噪声控制专业委员会
- 学会名称：中国振动工程学会振动与噪声控制专业委员会
- 页数：7
- 文件大小：532k
- 原文格式：D
- 会议级别：全国
摘要
本文提出一种新型反向号角超表面结构,详细分析其低频宽带声能聚焦吸声机理。通过结构厚度的改变,使得结构中传播的声波的声压幅值发生变化,从而将声波的能量局域在结构局部区域,实现声波的聚焦。研究发现:当特征长度与一个波长相近或者略小于,此时入射波起压缩作用,在其尖端发生能量聚焦;当特征长度大于一个波长,此时入射波在反向号角壁面发生发射,声能无法聚焦。考虑反向号角的高频吸声系数较差的原因,在其入射方向增加吸音材料,从而提高其吸声系数。这种反向号角模型将为声能聚焦以及耗散提供重要的理论依据,为一维吸声尖劈结构的小尺寸优化设计提供实际的工程运用背景。
In this paper, a new surface structure of reverse horn is presented, and the sound absorption mechanism for broadband low frequency acoustic energy focusing is analyzed in detail. Due to the alternation of the structure's thickness, the amplitude of the acoustic pressure propagated in the structure changes, thus the energy is local at the local area, realizing the energy focusing. In conclusion, when the characteristic length is equal to or less than a wavelength, the incident wave is compressed, so the energy is focused in the edge; otherwise the incident wave reflects in the reverse horn wall, the energy will not be focused. Considering the badness of the absorption of the reverse horn in the high frequency, adding the sound-absorbing material in its incident direction, thereby improve the overall high-frequency and low-frequency sound absorption coefficients. These excellent properties could find the potential applications of the one-dimensional absorption wedge and the control of the acoustic wave.
In this paper, a new surface structure of reverse horn is presented, and the sound absorption mechanism for broadband low frequency acoustic energy focusing is analyzed in detail. Due to the alternation of the structure's thickness, the amplitude of the acoustic pressure propagated in the structure changes, thus the energy is local at the local area, realizing the energy focusing. In conclusion, when the characteristic length is equal to or less than a wavelength, the incident wave is compressed, so the energy is focused in the edge; otherwise the incident wave reflects in the reverse horn wall, the energy will not be focused. Considering the badness of the absorption of the reverse horn in the high frequency, adding the sound-absorbing material in its incident direction, thereby improve the overall high-frequency and low-frequency sound absorption coefficients. These excellent properties could find the potential applications of the one-dimensional absorption wedge and the control of the acoustic wave.
引文
[1]V.V.Krylov.Conditions for validity of the geometrical-acoustic approximation in application to waves in an acute-angle solid wedge[J].Soviet Phys.Acoust.35,176-180,1989.
[2]V.V.Krylov.Localised acoustic modes of a quadratically shaped solid wedge[J].Moscow University Physics Bulletin,45(6),65-69,1990.
[3]V.Kralovic,V.V.Krylov.Damping of flexural vibrations in tapered rods of power-law profile:experimental studies[J].Proceedings of the institute of Acoustics,29(5),66-73,2007.
[4]J.J.Bayod.Experimental study of vibration damping in a modified elastic wedge of power-law profile[J].Journal of Vibration and Acoustics,133(6),061003,2011.
[5]E.P.Bowyer,V.V.Krylov.Experimental investigation of damping flexural vibrations in glass fibre composite plates containing one and two-dimensional acoustic black holes[J].Compposite Structures,2014,107(1):406-415.
[6]E.P.Bowyer,V.V.Krylov.Experimental investigation of damping flexural vibrations in plates containing tapered indentations of power-law profile[J].Applied Acoustics,2013,74(4):553-560.
[2]V.V.Krylov.Localised acoustic modes of a quadratically shaped solid wedge[J].Moscow University Physics Bulletin,45(6),65-69,1990.
[3]V.Kralovic,V.V.Krylov.Damping of flexural vibrations in tapered rods of power-law profile:experimental studies[J].Proceedings of the institute of Acoustics,29(5),66-73,2007.
[4]J.J.Bayod.Experimental study of vibration damping in a modified elastic wedge of power-law profile[J].Journal of Vibration and Acoustics,133(6),061003,2011.
[5]E.P.Bowyer,V.V.Krylov.Experimental investigation of damping flexural vibrations in glass fibre composite plates containing one and two-dimensional acoustic black holes[J].Compposite Structures,2014,107(1):406-415.
[6]E.P.Bowyer,V.V.Krylov.Experimental investigation of damping flexural vibrations in plates containing tapered indentations of power-law profile[J].Applied Acoustics,2013,74(4):553-560.