Theoretical and Computational Acoustics Ictca '99(with CD-Rom): Proceedings of the 4th International Conference Stazione Marittima, Trieste, Italy, 10-14 May 1999

Preface......Page 6
CONTENTS......Page 8
Wave Propagation Theory......Page 20
Uniformly Asymptotic Solutions for Pseudodifferential Equations with Singular Integral Operators......Page 22
The Kirchhoff-Helmholtz Integral Pair......Page 23
Analysis and Processing of Received Signals in Boreholes......Page 24
Informational Capacity of Acoustic Measurements......Page 25
Resonances of Acoustic Waves Interacting with an Elastic Seabed......Page 26
Modeled Velocity and Reflectivity Properties of Anisotropic Hydrated Sediments......Page 27
Reflection/Transmission Coefficients at a Plane Interface in Dissipative and Nondissipative Isotropic Media: A Comparison......Page 28
Analysis of the Reflection and Transmission Coefficients in Three-Phase Sandstone Reservoirs......Page 29
Fractional Diffusive Waves......Page 30
Acoustic Excitation of Scholte-Stoneley and Lamb Waves on a Reinforced Cylindrical Shell......Page 31
On the Adiabaticity of Acoustic Propagation Through Nongradual Ocean Structures......Page 32
Ferromagnets and Kelvin's Medium: Basic Equations and Wave Processes......Page 33
Propagation of Ultrasonic Waves in Nonlinear Multilayered Media......Page 34
Optimal Model for the Diffraction Effect in the Ultrasonic Field of Piston Transducers......Page 35
Oblique Acoustic Axes in Trigonal Crystals......Page 36
Acoustic Time Series Variability and Time Reversal Mirror Defocusing Due To Cumulative Effects Of Water Column Variability......Page 37
Numerical and Experimental Time-Reversal of Acoustic Waves in Random Media......Page 38
Fluctuations of Elastic Waves Due to Random Scattering from Inclusions......Page 39
Numerical Study of the Wave Instability Problem with the Effect of the Transverse Velocity Component......Page 40
Sound Propagation Vibrations and Noise......Page 42
Airborne Acoustics of Explosive Volcanic Eruptions......Page 44
Sound Generation of Interacting Perturbed Vortex Rings......Page 45
A Wide-Angle Parabolic Equation for Acoustic Waves in Inhomogeneous Moving Media: Applications to Atmospheric Sound Propagation......Page 46
Acoustics of Kinematically Complex Shear Flows......Page 47
Ultrasound Propagation Through a Rotational Flow: Numerical Methods Compared to Experiments......Page 48
Wave Propagation on an Elastic Beam Traveling in a Tube: Linear Theory of Aerodynamic Loading......Page 49
On the Vibration of Membrane Partially Protruding Above the Surface of Liquid......Page 50
Vibrational Analysis of Ships with Coupled Finite and Boundary Elements......Page 51
Transverse Resonant Oscillations in Acoustic Ducts......Page 52
Noise Shielding by Simple Barriers: Comparison Between the Performance of Spherical and Line Sound Sources......Page 53
Wave Propagation Through Hollow Bodies and Noise Reduction......Page 54
Generation of Ground Elastic Waves by Road Vehicles......Page 55
Underwater Acoustics......Page 56
Broadband Matched-Field Localization Performance in Uncertain Environments Using a Short Array......Page 58
A Frequency Domain Inversion Method Applied to Oblique Reflected Signals from a Water-Sediment Interface......Page 59
Application of a Three-Dimensional Two-Way Parabolic Equation Model for Reconstructing Images of Underwater Targets......Page 60
Determination of a Buried Object in a Two-Layered Shallow Ocean......Page 61
New Schemes of Ocean Acoustic Tomography......Page 62
Numerical Simulation of Transverse Current Monitoring in the Pram Strait......Page 63
Prospects for Medium-Scale Diffraction Tomography on the Shelf......Page 64
Engineering Seismology......Page 66
Applications of the Modal Summation Technique to the Theoretical Site Response Estimation......Page 68
Earthquake Ground Motion Simulation Through the 2-D Spectral Element Method......Page 69
The Variational Indirect Boundary Element Method: A Strategy Toward the Solution of Very Large Problems of Site Response......Page 70
Efficiency and Optimization of the 3-D Finite-Difference Modeling of Seismic Ground Motion......Page 71
Three-Dimensional Ground Motion Simulations for Large Earthquakes on the San Andreas Fault with Dynamic and Observational Constraints......Page 72
Modifications of the Ground Motion in Dense Urban Areas......Page 73
Numerical Simulations of Strong Ground Motion During Destructive Earthquakes in Hokkaido Japan......Page 74
Application of the Integral Laguerre Transforms for Forward Seismic Modeling......Page 75
Parallel 3D Fourier Spectral Simulation of Strong Ground Motion in Osaka Basin During the 1995 Kobe Earthquake......Page 76
Ultrasonic Field Synthesis and Modelling......Page 78
Speed-Accuracy Trade-Offs in Computing Spatial Impulse Responses for Simulating Medical Ultrasound Imaging......Page 80
Mechanism of Acoustic Wave Propagation: A Real Role of Virtual Sources......Page 81
Synthesis of Unequally Spaced Arrays with Asymmetric Beam Patterns......Page 82
Real-Time Deconvolution in Ultrasonic Imaging Systems......Page 83
Time Reversal in Acoustics......Page 84
Computation of the Ultrasonic Field Radiated by Segmented-Annular Arrays......Page 85
Numerical Techniques for Modeling Doppler Ultrasound Spectra Systems......Page 86
Influence of the Inter-Element Coupling on Ultrasound Array Radiation Patterns......Page 87
Computational Methods......Page 88
A Direct Discrete Formulation for the Wave Equation......Page 90
An Hexahedral Face Element Method for the Displacement Formulation of Structural Acoustics Problems......Page 91
A Comparison of Numerical Methods for Active Sonar Array Performance......Page 92
On the Efficient Implementation of the Integral Equation Method in Elastodynamics......Page 93
A Generalized Mode Matching Method for Scattering Problems with Unbounded Obstacles......Page 94
AILU for Helmholtz Problems: A New Preconditioner Based on the Analytic Parabolic Factorization......Page 95
Application of a Domain Decomposition Method with Lagrange Multipliers to Acoustic Problems Arising from the Automotive Industry......Page 96
Visualization of the Energy Flow in and Around a Fluid Loaded Elastic Sphere......Page 97
Noise Prediction Based on the Spectral Method for Solving a Dissipative Boundary Value Problem in Acoustics and Its Numerical Realization......Page 98
Sine Solution of the Shallow Water Equations......Page 99
Finite Elements for Wave Problems......Page 100
Numerical Studies of Conjugated Infinite Elements for Acoustical Radiation......Page 102
A Reflection Free Boundary Condition for Propagation in Uniform Flow Using Mapped Infinite Wave Envelope Elements......Page 103
A Review of Infinite Element Methods for Exterior Helmholtz Problems......Page 104
On Fundamental Aspects of Exterior Approximations with Infinite Elements......Page 105
Finite Element Solution of Two-Dimensional Acoustic Scattering Problems Using Arbitrarily Shaped Convex Artificial Boundaries......Page 106
Third-Order Doubly Asymptotic Approximations for Computational Acoustics......Page 107
Analytical and Numerical Studies of a Finite Element PML for the Helmholtz Equation......Page 108
Continued-Fraction Absorbing Boundary Conditions for the Wave Equation......Page 109
Optimal Local Nonreflecting Boundary Conditions for Time-Dependent Waves......Page 110
Mixed Finite Elements with Mass-Lumping for the Transient Wave Equation......Page 111
Short Wave Modelling Using Special Finite Elements......Page 112
A Numerical Comparison of Finite Element Methods for the Helmholtz Equation......Page 113
Efficient Computation of Multi-Frequency Far-Field Solutions of the Helmholtz Equation Using Pade Approximation......Page 114
An Iterative Time-Stepping Method for Solving First-Order Time Dependent Problems and Its Application to the Wave Equation......Page 115
Wave Propagation Modeling......Page 116
Fictitious Domains Mixed Finite Elements and Perfectly Matched Layers for 2-D Elastic Wave Propagation......Page 118
Higher-Order Mass-Lumped Finite Elements for the Wave Equation......Page 119
Numerical Study of Elastic Wave Scattering by Cracks or Inclusions Using the Boundary Integral Equation Method......Page 120
Finite-Difference Modeling in Media with Many Small-Scale Cracks......Page 121
Scale and Angle Dependent Reflection Properties of Self-Similar Interfaces......Page 122
Elastic Waves Generated by High-Speed Trains......Page 123
Adaptive Finite Element Techniques for the Acoustic Wave Equation......Page 124
Wave Propagation in 2-D Elastic Media Using a Spectral Element Method with Triangles and Quadrangles......Page 125
A Comparative Study of Explicit Differential Operators on Arbitrary Grids......Page 126
A High-Order Fast Marching Scheme for the Linearized Eikonal Equation......Page 127
Frequency Domain Wave Propagation Modeling in Exploration Seismology......Page 128
Three-Dimensional Time Domain Modeling of Ultrasonic Wave Propagation in Concrete in Explicit Consideration of Aggregates and Porosity......Page 129
Time Domain Modeling of Axisymmetric Wave Propagation in Isotropic Elastic Media with Cent - Cylindrical Elastodynamic Finite Integration Technique......Page 130
On the Propagation of Acoustic Pulses in Porous Rigid Media: A Time-Domain Approach......Page 131
Triangle-Quadrangle Grid Method for Poroelastic Elastic and Acoustic Wave Equations......Page 132
Absorbing Layer via Wave-Equation Splitting......Page 133
Optimised Absorbing Boundary Conditions for Elastic-Wave Propagation......Page 134
Conjugated Infinite Elements for Two-Dimensional Time-Harmonic Elastodynamics......Page 135
Inverse Problems and Tomography......Page 136
Reconstruction of Layered Elastic Bottom Characteristics by the Frequency Dependence of Sound Reflectivity......Page 138
Joint 3D Traveltime Inversion of P S and Converted Waves......Page 139
Complete Families and Rayleigh Obstacles......Page 140
A Simple Regularization Method for Solving Acoustical Inverse Scattering Problems......Page 141
The Use of the Herglotz Function Method to Reconstruct Obstacles from Real and from Synthetic Scattering Data......Page 142
Nonlinear Inversion of Piezoelectrical Transducer Impedance Data......Page 143
An Algorithm for the Fully Nonlinear Inverse Scattering Problem at Fixed Frequency......Page 144
Maximum Likelihood Inversion of Active Reverberation for Boundary Localization on a Moving Sonar Platform......Page 145
Mathematical Simulation in Diffraction Acoustical Tomography with Multielement Transceiver......Page 146
Radial Ultrasonic Tomography Technique as a New Method of Flaw Imaging......Page 147
Multiresolution in 3D Seismic Tomography Within Physical Limits......Page 148
Geoacoustic Inversion in Shallow Water......Page 150
Objective Functions for Ocean Acoustic Inversion Derived by Likelihood Methods......Page 152
Deductive Multi-Tone Inversion of Seabed Parameters......Page 153
Tomographic Inversion for Geoacoustic Parameters in Shallow Water......Page 154
Matched Field Tomographic Inversion to Determine Range Dependent Geoacoustic Properties......Page 155
Identifying Modal Arrivals in Shallow Water for Bottom Geoacoustic Inversions......Page 156
Geoacoustic Tomography: Range Dependent Inversions on a Single Slice......Page 157
Nonlinear Soliton Interaction with Acoustic Signals: Focusing Effects......Page 158
Seafloor Properties Determination from Acoustic Backscattering at Normal Incidence with a Parametric Source......Page 159