Theoretical and computational acoustics 2005: Hangzhou, China, 19-22 September 2005

Alexandra Tolstoy, Er-Chang Shang, Yu-Chiung Teng9789812700841, 981-270-084-6

This volume represents the latest advances in the field of theoretical and computational acoustics. The coverage includes results in the areas of underwater acoustics, seismics, scattering, inversion, genetic algorithms, reverberation, IFEM, Radon transforms, wavelet statistics, PE modeling, and Gaussian beams.

---

Table of contents :
CONTENTS……Page 10
Preface……Page 6
1 Introduction……Page 12
3 Solution Techniques……Page 13
References……Page 14
II. THE LONG RANGE GEOACOUSTIC INVERSION EXPERIMENTS……Page 16
III. GEO-ACOUSTIC INVERSION METHOD……Page 17
IV. INVERSION RESULTS……Page 20
References……Page 23
1 Introduction……Page 26
2 Fundamental Principle……Page 27
3 Testifying of the Theoretical Models and Practical Data……Page 29
Reference……Page 32
1 Introduction……Page 34
2 Simulation Approach……Page 35
3 Implementation and Results……Page 37
5 Reference……Page 42
1 Introduction……Page 44
2 Data collection……Page 45
3 Estimation of interface wave dispersion……Page 46
4 Inversion algorithm……Page 47
5 Data analysis……Page 48
6 Conclusion……Page 53
References……Page 54
1. Introduction……Page 56
2. The singularity analysis of the kernel matrix……Page 57
3. Numerical examples……Page 59
4. Summary……Page 61
References……Page 62
Semi-Automatic Adjoint PE Modeling for Geoacoustic Inversion……Page 64
1. Introduction……Page 65
2. Modular graph approach……Page 66
3. Wide-angle PE……Page 69
Acknowledgments……Page 72
References……Page 74
1 Introduction……Page 76
2 Theoretical Derivation……Page 77
3 Numerical Modeling……Page 82
4 Model Appraisal……Page 87
5 Summary……Page 95
References……Page 97
1. Introduction and Summary……Page 100
2. Computational Method……Page 101
3. Basic Example……Page 103
4. Nonnormally Reflected Beams……Page 104
5. Design of Anechoic Coatings……Page 106
References……Page 109
1 Introduction……Page 110
3 Seismic attributes versus incidence angle for thin-layer……Page 111
4 Seismic attributes versus scale for thin-layer……Page 117
5 Reflection coefficient spectrum for thin-layer thickness and velocity change……Page 121
6 Time-frequency analysis for thin-layer……Page 123
7 Conclusions and discussions……Page 125
Reference……Page 126
1. Introduction……Page 130
2. Basic Development……Page 131
3. Energy-Conserving Property……Page 132
5. Conclusion……Page 133
References……Page 134
1 Introduction……Page 138
2 Recovery of elastic parameters using joint inversion method……Page 139
3 Field data application……Page 141
5 Acknowledgments……Page 144
6 References……Page 145
1 Introduction……Page 146
2 Gaussian Beam Method……Page 147
3 Verification of the NUTRAY Model……Page 149
4 Two-layered Bottom Model……Page 153
6 Reference……Page 154
1. Introduction……Page 156
2. AVOA for ORT Media……Page 157
3. NGA Inversion Algorithm……Page 159
4. Numerical Simulation……Page 160
Acknowledgments……Page 162
References……Page 163
I. INTRODUCTION……Page 164
II. BLIND DECONVOLUTION……Page 165
III. INVERSE REFLECTION PROBLEM……Page 169
IV. RESULTS……Page 170
V. CONCLUSIONS……Page 171
ACKNOWLEDGEMENTS……Page 172
1. Introduction……Page 178
2. The classification scheme……Page 179
3. Study of the sensitivity of the KLD for geoacoustic inversions……Page 181
4. Conclusions……Page 184
References……Page 185
1. Introduction……Page 186
2. Basic Principles of the Spectral Element Methods……Page 188
3. Basis Functions and Element Quadrature……Page 193
4. Element by Element Iterative Solver……Page 199
5. Error Analysis and Convergence Comparisons……Page 201
7. Acknowledgments……Page 203
References……Page 207
1. Introduction……Page 210
2. Normal Mode Model of Reverberation in Shallow-Water Waveguide……Page 211
3. Characteristics of Modal Back-Scattering Matrix……Page 212
4. Inversion of Modal Back-Scattering Matrix……Page 215
5. Conclusion……Page 218
References……Page 219
1. Introduction……Page 220
3. Practical Methods to Define Scattering Coefficient……Page 221
4. Prediction of Various Models……Page 224
5. Concluding Remarks……Page 228
References……Page 229