Maria Bayard Dühring - Solid Mechanics

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Optimization of acoustic, optical and optoelastic devices by Maria Bayard Dühring DEPT. OF MECHANICAL ENGINEERING SOLID MECHANICS Solid Mechanics Dept. of Mechanical Engineering TECHNICAL UNIVERSITY OF OF DENMARK
Page 1: Optimization of acoustic, optical a
Page 5 and 6: Preface This thesis is submitted in
Page 7 and 8: Abstract The field of research deal
Page 9 and 10: Contents Preface i Resumé (in Dani
Page 11 and 12: Chapter 1 Introduction 1.1 Aim of t
Page 13 and 14: Chapter 2 Time-harmonic propagating
Page 15 and 16: 2.1 Elastic and optical waves 5 to
Page 17 and 18: 2.2 Modeling of wave problems 7 in
Page 19 and 20: 2.3 Discretizing and solving wave p
Page 21 and 22: Chapter 3 Topology optimization app
Page 23 and 24: 3.1 Topology optimization and propa
Page 25 and 26: 3.3 The optimization problem 15 3.3
Page 27 and 28: 3.4 Sensitivity analysis 17 The two
Page 29 and 30: 3.5 Practical implementation 19 3.5
Page 31 and 32: Chapter 4 Design of sound barriers
Page 33 and 34: 4.2 Results 23 To obtain better num
Page 35 and 36: 4.2 Results 25 objective function,
Page 37 and 38: Chapter 5 Design of photonic-crysta
Page 39 and 40: 5.2 Results 29 the sum of the squar
Page 41 and 42: 5.2 Results 31 Figure 5.4 Two simpl
Page 43 and 44: Chapter 6 Design of acousto-optical
Page 45 and 46: 6.2 The acousto-optical model 35 [2
Page 47 and 48: 6.3 Modeling surface acoustic waves
Page 49 and 50: 6.4 Acousto-optical interaction in
Page 51 and 52: 6.4 Acousto-optical interaction in
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6.4 Acousto-optical interaction in
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6.5 High aspect ratio electrodes 49
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Chapter 7 Concluding remarks The wo
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7.1 Future work 57 the studied prob
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References [1] H. Kuttruff, Room ac
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References 61 [28] COMSOL Reference
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References 63 [55] Y. Tsuji, K. Hir
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References 65 [79] J. Hu and C. R.
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Journal of Sound and Vibration 317
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sinusoidal sound waves are emitted.
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The degrees of freedom (dofs) corre
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y [m] 8 6 4 2 ARTICLE IN PRESS M.B.
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optimization by approximating the o
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z [m] 3 2.5 2 3 y [m] 2 1 by Helmho
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z [m] 2.5 2 1.5 1 0.5 0 3 2 y [m] t
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ARTICLE IN PRESS M.B. Dühring et a
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4. Conclusion ARTICLE IN PRESS M.B.
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ARTICLE IN PRESS M.B. Dühring et a
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Design of photonic-bandgap fibers b
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Figure 1: Geometry of the photonic-
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Note, that derivatives with respect
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Figure 3: The center region of the
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Figure 5: Four simplified geometrie
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[4] J.D. Joannopoulos, S.G. Johnson
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Publication [P3] Surface acoustic w
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E0 Eout = { sin[ ωt − Δ φ1 sin
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Modulation (nW) 10 Modulation P 1/2
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Improving the acousto-optical inter
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083529-3 M. B. Dühring and O. Sigm
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8 th World Congress on Structural a
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well as the value of σj must be fo
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efractive index component n11 chang
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Table 2: Refractive index and strai
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mode in the waveguide. The topology
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Publication [P6] Energy storage and
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093504-2 Dühring, Laude, and Kheli
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Improving surface acousto-optical i
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piezoelectric directions. This is i
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FIG. 2: The displacements u1, u2 an
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TABLE II: The difference in effecti
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FIG. 7: Results for the acousto-opt
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DTU Mechanical Engineering Section
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Maria Bayard Dühring - Solid Mechanics

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