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研究生： 蔡孟航
Tsai, Meng-Hang
論文名稱： 多層聲學超穎材料之聲音穿透分析
Sound Transmission of Multi-layered Acoustic Metamaterials
指導教授： 陳蓉珊
Chen, Jung-San
學位類別： 碩士
Master
系所名稱： 工學院 - 工程科學系
Department of Engineering Science
論文出版年： 2015
畢業學年度： 103
語文別： 英文
論文頁數： 61
中文關鍵詞： 聲學 、超穎材料 、穿透損失 、有效質量
外文關鍵詞： Acoustic, Metamaterial, Transmission Loss, Effective Mass
相關次數： 點閱：157  下載：12 
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    • 本篇論文主要研究目的在於多層聲學超穎材料之探討，由先前學者的研究發現單層聲學超穎材料在低頻時可以有效的阻隔聲音傳遞。而週期性結構之特性為阻擋某特定頻率下聲波通過。因此，我們藉由多層聲學超穎材料結合這兩種不同的特性，並且獲得更多的頻帶和更好的隔音的效果。
    本論文使用 Comsol Multiphysics 有限元素分析模擬軟體，並進行穿透損失及有效質量之探討，我們調整了中心質量的重量、薄膜的密度與作用在薄膜邊界上之張力，以及不同排列方式之薄膜和超穎材料的相互層疊對穿透損失曲線的影響，並且比對單層聲學超穎材料和多層聲學超穎材料之共振和反共振頻率。

    The main purpose of this thesis is to explore the multi-layered membrane-type acoustic metamaterials. In recent years, many researchers have shown that the single-celled metamaterial can give more effective sound insulation at low frequency. The periodic structure can block certain frequencies of sound waves. Hence, we combine these two different characteristics by stacking membrane-type acoustic metamaterials in series. It can give more bandwidth and more effective sound insulation.
    In this thesis, we used Comsol Multiphysics, a finite element analysis software package to explore transmission loss (TL) and effective mass. We adjusted the mass weight, membrane density, the tension force on the edges of the membrane, and the arrangement of the membranes and metamaterials, and considered their effect on the characteristics of the TL curve. The TL valley and peak frequencies of the single-celled metamaterial are compared with the stacked metamaterials.

    中文摘要 I Abstract II Acknowledgment III List of Figures VI List of Tables IX Nomenclature XI CHAPTER 1 INTRODUCTION 1 1.1 Motivation 1 1.2 Literature Reviews 1 1.3 Chapter Outline 4 CHAPTER 2 THEORY 5 2.1 The Propagation of Wave [11] 5 2.2 Normal Incidence Sound Transmission through a Partition [11] 6 2.3 Transmission Loss of Membrane-type Acoustic Metamaterial [5] 9 2.4 Effective Dynamic Mass of Membrane-type Acoustic Metamaterial 13 CHAPTER 3 FINITE ELEMENT SIMULATIONS 15 3.1 Introduction of Comsol Multiphysics 15 3.2 Finite Element Modeling and Analysis 16 3.2.1 Simulation Setting of Membrane-type Metamaterials 16 3.2.2 Simulation Setting of Multiple Cell 22 CHAPTER 4 NUMERICAL RESULTS 24 4.1 Membranes Stacked in Series 24 4.2 A Single-layer Membrane-type Metamaterial 26 4.2.1 A Single-celled Metamaterial with Central Mass of 0.32 g 26 4.2.2 A Single-celled Metamaterial with Central Masses of 0.16 g, 0.08 g, and 0.04 g 29 4.2.3 A Four-celled Array Metamaterial with Uniform Masses 0.32 g 32 4.2.4 A Four-celled Arrays Metamaterial with Non-uniform Masses 34 4.3 Simulation Results Compare with Paper [4] 37 4.4 Membrane-central-mass Structures Stacked in Series 39 4.4.1 A Stacked Membrane-central-mass Structure with Uniform Masses (0.32 g) 39 4.4.2 A Stacked Membrane-central-mass Structure with Uniform Mass (0.16 g, 0.08 g, 0.04 g) 40 4.4.3 A Stacked Membrane-central-mass Structure with Non-uniform Masses 46 4.5 A Composite Structure 49 4.6 A Stacked Array-type Structure 52 4.6.1 A Stacked Array-type Structure with Uniform Masses 0.32 g 52 4.6.2 A Stacked Array-type Structure with Non-uniform Masses 53 CHAPTER 5 CONCLUSION 57 References 59

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