155 resources related to Elastodynamics
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2020 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting
The joint meeting is intended to provide an international forum for the exchange of information on state of the art research in the area of antennas and propagation, electromagnetic engineering and radio science
The CDC is the premier conference dedicated to the advancement of the theory and practice of systems and control. The CDC annually brings together an international community of researchers and practitioners in the field of automatic control to discuss new research results, perspectives on future developments, and innovative applications relevant to decision making, automatic control, and related areas.
electronic components, materials, packaging, integration, microfluidics, mems, sensors
Chinese Control and Decision Conference is an annual international conference to create a forum for scientists, engineers and practitioners throughout the world to present the latest advancement in Control, Decision, Automation, Robotics and Emerging Technologies.
The conference is the primary forum for cross-industry and multidisciplinary research in automation. Its goal is to provide a broad coverage and dissemination of foundational research in automation among researchers, academics, and practitioners.
IEEE Antennas and Wireless Propagation Letters (AWP Letters) will be devoted to the rapid electronic publication of short manuscripts in the technical areas of Antennas and Wireless Propagation.
Broad coverage of concepts and methods of the physical and engineering sciences applied in biology and medicine, ranging from formalized mathematical theory through experimental science and technological development to practical clinical applications.
Theory, concepts, and techniques of science and engineering as applied to sensing the earth, oceans, atmosphere, and space; and the processing, interpretation, and dissemination of this information.
All aspects of optical guided-wave science, technology, and engineering in the areas of fiber and cable technologies; active and passive guided-wave componentry (light sources, detectors, repeaters, switches, fiber sensors, etc.); integrated optics and optoelectronics; systems and subsystems; new applications; and unique field trials.
Science and technology related to the basic physics and engineering of magnetism, magnetic materials, applied magnetics, magnetic devices, and magnetic data storage. The Transactions publishes scholarly articles of archival value as well as tutorial expositions and critical reviews of classical subjects and topics of current interest.
2014 International Conference on Electromagnetics in Advanced Applications (ICEAA), 2014
The paper deals with the scalar (acoustic) diffraction of a uniform complex- source beam (Uniform CSB) by an acoustically soft or hard semi-infinite circular cone. The diffracted field is found by evaluating the bilinear modal form of the cone's Green's function and by assigning suitable complex-valued source coordinates. The field expansion is valid everywhere in space including the waist of ...
International Conference on Mathematical Methods in Electromagnetic Theory, 2002
Mathematical methods in diffraction problems for elastic time-harmonic waves on defects are considered. It is assumed that body forces are absent and the defect may be disposed on the plane in the homogeneous isotropic space or on the media interface of two homogeneous isotropic half-spaces. Systems of singular integral equations are obtained for the problems. Some approaches to elastodynamic problems ...
2018 International Workshop on Computing, Electromagnetics, and Machine Intelligence (CEMi), 2018
Electromagnetic interaction with elastic objects includes both electrodynamic and elastodynamic processes which are of multiphysics feature. The electrodynamic process is governed through Maxwell's equations while the elastodynamic process is described by elastic wave equations and they are coupled together by excitations. Traditionally, these equations are presented in the form of partial differential equations and only differential equation solvers can be ...
1982 Ultrasonics Symposium, 1982
IEEE 1986 Ultrasonics Symposium, 1986
The paper deals with the scalar (acoustic) diffraction of a uniform complex- source beam (Uniform CSB) by an acoustically soft or hard semi-infinite circular cone. The diffracted field is found by evaluating the bilinear modal form of the cone's Green's function and by assigning suitable complex-valued source coordinates. The field expansion is valid everywhere in space including the waist of the beam and consists of a diverging as well as of a converging part. Results are shown for the scalar fields diffracted and scattered by the area around the tip of the circular cone.
Mathematical methods in diffraction problems for elastic time-harmonic waves on defects are considered. It is assumed that body forces are absent and the defect may be disposed on the plane in the homogeneous isotropic space or on the media interface of two homogeneous isotropic half-spaces. Systems of singular integral equations are obtained for the problems. Some approaches to elastodynamic problems in the case of an anisotropic elastic medium are considered too. Analogues of the Lopatinskii condition and boundary conditions of an elliptic boundary value problem in the halfspace are obtained. It is shown that both approaches are equivalent. To solve these problems classes of outgoing from plane solutions are introduced. The Fourier transformation in the class of generalized functions of slow growth at infinity and presentations of solutions of the problems by potential functions are used.
Electromagnetic interaction with elastic objects includes both electrodynamic and elastodynamic processes which are of multiphysics feature. The electrodynamic process is governed through Maxwell's equations while the elastodynamic process is described by elastic wave equations and they are coupled together by excitations. Traditionally, these equations are presented in the form of partial differential equations and only differential equation solvers can be used to solved them. In this work, we develop coupled integral equations for the multiphysics process based on equivalence theorem so that integral equation solvers can be used to solve them. A typical numerical example is presented to demonstrate the approach and good results have been obtained.
Numerical methods are extremely useful in solving real-life problems with complex materials and geometries. However, numerical methods in the time domain stiffer from artificial numerical dispersion. Standard numerical techniques which are second-order in space and time, like the conventional finite-difference three point (FD3) method, finite-difference time-domain (FDTD) method, and finite integration technique (FIT), provide estimates of the error of discretized numerical operators rather than the error of the numerical solutions computed using these operators. Here, optimally accurate time-domain (TD) finite-difference (FD) operators which are second-order in time as well as in space are derived. Optimal accuracy means the greatest attainable accuracy for a particular type of scheme, e.g., second-order FD, for some particular grid spacing. The modified FD scheme - FD modified: FDM - presented here attains reduction of numerical dispersion almost by a factor of 40 compared to the FD3, FDTD, and FIT. The CPU time for the FDM scheme is twice of that required by FD3 method. The modified operators lead to an implicit scheme, which is approximated by a predictor-corrector scheme yielding a two step explicit scheme. The possibility of extending this method to a staggered grid approach is also presented. Finally the comparison between analytical solution, FDTD/FIT method, FD3 method and FDM scheme with simulation results is depicted. Further examples are given in the presentation.
In this paper we present a simple algorithm for determining the mass density of an elastic inclusion from the knowledge of how the inclusion scatters known incident elastic waves. The reconstructions are obtained with the Contrast Source Inversion method (CSI), extended with a multiplicative regularization and using transmission and reflection measurements.
The procedure to study the stresses in the vicinity of arbitrary-form cavity in elastic half-space is proposed. The surface of the cavity is under time- variable pressure. The procedure is based on utilization of Fourier integral time transform and method of null-field.
Functionally graded materials (FGMs) are defined as materials featuring engineered gradual spatial transitions in microstructure and/or composition thus having gradually varying mechanical properties. A rarely treated topic is the elastodynamic wave propagation in FGMs. It is of particular interest since the reflection, refraction, and transmission of mechanical waves is frequency dependent provided that the spatial area in which the material properties vary is in the order of the mechanical wave lengths to be distinguished. This opens a wide field of potential engineering applications like micromechanical frequency filters, spectrum analyzers, or acoustic isolation layers. Frequency sensitive elastodynamic wave propagation phenomena are demonstrated, based on 2D numerical simulations and on a series of short-pulse-laser-acoustic experiments. There, the frequency dependent reflection and transmission behavior caused by intermetallic interface layers of 10 to 20 nm thickness has been demonstrated, which corresponds to a micromechanical filter operating in the frequency range of 0.5 THz.
We have summarized our work on well-posed PML for electromagnetic waves, scalar acoustic waves, and elastic waves. We have also applied the PML to more complex systems including poroelastic waves (Biot waves) and acoustoelasticity, as well as quantum transport. Numerical results of these PMLs in various wave phenomena will be demonstrated with finite-difference time-domain, pseudospectral time-domain (PSTD), spectral element time-domain (SETD) and frequency-domain methods.
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