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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 吳政忠,劉佩玲 | |
| dc.contributor.author | Chung-Hao Hsu | en |
| dc.contributor.author | 許中豪 | zh_TW |
| dc.date.accessioned | 2021-06-13T03:20:21Z | - |
| dc.date.available | 2007-07-31 | |
| dc.date.copyright | 2006-07-31 | |
| dc.date.issued | 2006 | |
| dc.date.submitted | 2006-07-27 | |
| dc.identifier.citation | References
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Tamura, “Band structure of acoustic waves in phononic lattices: Two-dimensional composites with large acoustic mismatch,” Phys. Rev. B, vol. 62, no. 11, pp. 7387–7392, (2000). 38. W. Gropp, E. Lusk, N. Doss, and A. Skjellum, “A highperformance, portable implementation of the MPI message passing interface standard,” Parallel Comput., vol. 22, pp. 789–828, (1996). 39. Po-Feng Hsieh, Tsung-Tsong Wu and Jia-Hong Sun, “Three-Dimensional Phononic Band Gap Calculations Using the FDTD Method and a PC Cluster System,” IEEE, J. Ultrasonics, Ferroelectrics and Freq. Control, 53 (1), 148-158 (2006). 40. Chunyin Qiu, Zhengyou Liu, Jun Mei, and Jing Shi, “Mode-selecting acoustic filter by using resonant tunneling of two-dimensional double phononic crystals,” Appl. Phys. Lett.87, 104101 (2005). | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/31792 | - |
| dc.description.abstract | In this thesis, we propose a design of a highly amplified directional acoustic source. The calculations in our work are based on the finite difference time domain (FDTD) method. A parallelized computation program with a message passing interface (MPI) is written and executed on a PC cluster system with 8 CPUs. The program is then adopted to calculate the dispersion relations, the transmission coefficients and the elastic field distribution throughout this thesis. We find that the order of the cavity resonant mode and the reflection coefficient of the phononic crystal slab are the key factors in designing a directional acoustic amplifier. In the design, the first order resonant mode of the cavity is highly recommended for obtaining a much higher amplification ratio. To obtain directional acoustic source, the first order resonant mode has to be tuned so as to be located in the complete band gap. Beyond that, the first resonant frequency is required to match with the highest reflection coefficient of the phononic crystal slab to obtain the highest amplification ratio. On the other hand, we demonstrate that a highly directive radiation source operates at the band edge of phononic crystals without requiring defect modes. The radiation pattern of a point source embedded inside phononic crystals strongly depends on the frequency and the crystal size. The findings of our study may be employed to improve the performance of certain devices such as sonars. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-13T03:20:21Z (GMT). No. of bitstreams: 1 ntu-95-R93543021-1.pdf: 1890956 bytes, checksum: 2402583380547f2772c3812fa3504bfb (MD5) Previous issue date: 2006 | en |
| dc.description.tableofcontents | Contents
致謝 I Abstract II Notations III Contents VI Figures VIII Chapter 1 Introduction 1 1-1 Research motivation 1 1-2 Literature review 1 1-3 Contents of the chapter 3 Chapter 2 The FDTD Method and Theory of Phononic Crystals 5 2-1 Equation of the wave propagation and the FDTD method 5 2.1.1 Elastodynamic equation 6 2.1.2 Inner grids, source grids and boundary grids 10 2-2 The theory of the wave propagation in the phononic crystals 13 2.2.1 Bloch’s theorem and equation of the wave propagation 14 2.2.2 Bloch’s boundary condition 22 2-3 Parallel computing in the PC cluster system 25 Chapter 3 Analysis of A Directional Acoustic Source Based on The Resonant Cavity of Two-Dimensional Phononic Crystals 30 3-1 Directional acoustic source 30 3-2 Transmission coefficients of the resonant cavity 32 3-3 Directional band structure of the superlattice 34 3-4 Amplitude distribution of the resonant cavity in the near field 35 3-5 Analysis of resonant modes in the cavity 36 Chapter 4 Design of A Highly Amplified Directional Acoustic Source Based on The Resonant Cavity of Two-dimensional Phononic Crystals 45 4-1 Two important factors in the highly amplified directional acoustic source 45 4-2 Tuning the first order resonant frequency into the complete band gap 46 4-3 Amplification ratios versus resonant frequencies of first modes and second modes 47 4-4 Amplification ratios versus different combinations of phononic slabs 48 Chapter 5 Highly Directive Radiation from A Point Source Embedded inside Phononic Crystals 89 5-1 The property of the band edge of the complete band gap 89 5-2 Restricting the emission of a point source in a small angular region 91 5-3 The radiation patterns versus the radiation frequencies near the upper band edge 92 5-4 The radiation patterns versus various crystal widths 92 5-5 The radiation patterns versus various crystal lengths 92 Chapter 6 Conclusions and Future Works 101 6-1 Conclusions 101 6-2 Future works 104 References 105 | |
| dc.language.iso | en | |
| dc.subject | 頻緣 | zh_TW |
| dc.subject | 聲子晶體 | zh_TW |
| dc.subject | 聲波放大器 | zh_TW |
| dc.subject | 頻溝 | zh_TW |
| dc.subject | Phononic crystal | en |
| dc.subject | Band edge | en |
| dc.subject | Band gap | en |
| dc.subject | Acoustic amplifier | en |
| dc.title | 二維聲子晶體於高方向性
聲波放大器之分析與設計 | zh_TW |
| dc.title | Analysis and Design of A Highly Directional Acoustic Amplifier Based on Two-Dimensional Phononic Crystals | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 94-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 郭茂坤 | |
| dc.subject.keyword | 聲子晶體,聲波放大器,頻溝,頻緣, | zh_TW |
| dc.subject.keyword | Phononic crystal,Acoustic amplifier,Band gap,Band edge, | en |
| dc.relation.page | 109 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2006-07-30 | |
| dc.contributor.author-college | 工學院 | zh_TW |
| dc.contributor.author-dept | 應用力學研究所 | zh_TW |
| 顯示於系所單位： | 應用力學研究所 | |
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