金字塔型空心点阵结构的隔声特性研究
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摘要
周期点阵结构作为新型结构运用到航天器时,需要考虑结构的轻量化和隔声效果。为了优化传统金字塔型点阵结构的轻量化设计并且提高其隔声效果,研究相同几何参数的金字塔型实心和空心点阵结构的空间构成和隔声量曲线,发现金字塔型空心点阵结构更有利于结构的轻量化并且其隔声效果在大部分频段内优于金字塔型实心点阵结构。基于直接声振耦合理论,用数值方法系统研究了金字塔型空心点阵结构的隔声特性,分析了空心杆件仰俯角、空心杆件壁厚、空心杆件长度、空心杆件截面形状以及点阵结构的晶格常数、面内尺寸等重要结构参数对金字塔型空心点阵结构隔声特性的影响,为点阵结构的声学优化提供了有意义的参考。
Periodic lattice structures applied in spacecrafts as a new type structure require considering both structural lightweight and excellent sound insulation performance. In order to optimize the traditional pyramidal lattice structure lightweight design and improve its sound insulation effect, the space composition and sound insulation characteristics of pyramidal lattice structures with solid trusses and hollow trusses with the same geometrical parameters were studied here,it was found that the lightweight performance and sound insulation properties of pyramidal lattice structures with hollow trusses in most parts of frequency domain are better than those of pyramidal lattice structures with solid trusses. Based on the direct acoustic-vibration coupling theory,the sound insulation characteristics of pyramidal lattice structures with hollow trusses were studied systematically with numerical methods. The influences of several key structural parameters of hollow truss,such as,elevation angle,wall thickness,length,and cross section shape as well as crystal lattice constant and in-plane size of lattice structure on sound insulation characteristics of the system were analyzed.The results provided a reference for the acoustic optimization of lattice structures.
Periodic lattice structures applied in spacecrafts as a new type structure require considering both structural lightweight and excellent sound insulation performance. In order to optimize the traditional pyramidal lattice structure lightweight design and improve its sound insulation effect, the space composition and sound insulation characteristics of pyramidal lattice structures with solid trusses and hollow trusses with the same geometrical parameters were studied here,it was found that the lightweight performance and sound insulation properties of pyramidal lattice structures with hollow trusses in most parts of frequency domain are better than those of pyramidal lattice structures with solid trusses. Based on the direct acoustic-vibration coupling theory,the sound insulation characteristics of pyramidal lattice structures with hollow trusses were studied systematically with numerical methods. The influences of several key structural parameters of hollow truss,such as,elevation angle,wall thickness,length,and cross section shape as well as crystal lattice constant and in-plane size of lattice structure on sound insulation characteristics of the system were analyzed.The results provided a reference for the acoustic optimization of lattice structures.
引文
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[4]王康乐,温华兵,陆金铭,等.橡胶芯夹层板隔声特性研究[J].噪声与振动控制,2014,34(2):190-197.WANG Kangle,WEN Huabing,LU Jinming,et al.The sound transmission loss of sandwich with rubber sore[J].Noise and vibration,2014,34(2):190-197.
[5]CHANDRA N,RAJA S,NAGENDRAGOPAL K V.Vibroacoustic response and sound transmission loss analysis of functionally graded plates[J].Journal of Sound and Vibration,2014,333:5786-5802.
[6]ARURNKUMAR M P,JAGADEESH M.Sound radiation and transmission loss characteristics of a honeycomb sandwich panel with composite facings:effect of inherent material damping[J].Journal of Sound and Vibration,2016.
[7]文瑶.周期性开孔阻尼复合结构的声学特性研究[D].武汉:湖北工业大学,2015.
[8]SHEN C,XIN F X,LU T J.Theoretical model for sound transmission through finite sandwich structures with corrugated core[J].International Journal of Non-Linear Mechanics,2012,47(12):1066-1072.
[9]严胜杰.轻质点阵结构中振动与声传播特性研究[D].哈尔滨:哈尔滨工业大学,2013.
[10]MOOSAVIMEHR E.Sound transmission characteristics of sandwich panels with a truss lattice core[D].Vancouver The University of British Columbia,2016.
[11]SHEN C,ZHANG Q,JIN F C,et al.Sound transmission loss of adhesively bonded sandwich panels with pyramidal truss core:theory and experiment[J].International Journal of Applied Mechanics,2015,7(1):1540013.
[12]陈馨蕊,郝志勇,杨陈,等.结构-声耦合法在汽车仪表板隔声性能仿真分析中的应用[J].振动与冲击,2009,28(8):154-157.CHEN Xinrui,HAO Zhiyong,YANG Chen,et al.Simulation on sound insulation performance analysis of automotive dash by using structure-sound interaction method[J].Journal of Vibration and Shock,2009,28(8):154-157.
[13]LARBJ W,DEU J F,OHAYON R.Vibroacoustic analysis of double-wall sandwich panels with viscoelastic core[J].Computers and Structures,2016,174:92-103.
[14]WANG T A,LI S,NUTT S R.Optimal design of acoustical sandwich panels with a genetic algorithm[J].Applied Acoustics,2009,70:416-425.
[15]CHENG L,LI Y Y,GAO J X,et al.Energy transmission in a mechanically-linked double-wall structure coupled to an acoustic enclosure[J].Journal of the Acoustical Society of America,2005,117(5):2742-2751.
[16]杜功焕,朱哲民,蔡秀芬.声学基础[M].南京:南京大学出版社,2001.
[17]HUANG C Z,NUTT S.Sound transmission prediction by 3-D elasticity theory[J].Applied Acoustics,2009,70(5):730-736.
[18]LMS International.Numerical acoustics theoretical manual[M].
[19]孙勇敢,黎胜.受静压力作用加筋板隔声性能研究[J].振动与冲击,2016,35(6):169-173.SUN Yonggan,LI Sheng.Sound transmission through stiffened plates under static pressure[J].Journal of Vibration and Shock,2016,35(6):169-173.
[20]詹福良,徐俊伟.声学仿真计算从入门到精通[M].西安:西北工业大学出版社,2013.