Audio acoustic modeling using full‐wave methods

The ability to calculate traveltimes and amplitudes of seismic waves is useful for many reflection seismology applications such as migration and tomography. Traditionally, ray tracing (C⁁erveny et al., 1977; Julian, 1977), paraxial methods (Claerbout, 1971), or full‐wave methods (Alterman and Karal, 1968) are used for such calculations. These methods have in common considerable computational expense. Recently, Vidale (1988, 1990a) presented two‐dimensional and three‐dimensional methods to efficiently compute traveltimes of the first arrivals to every point in a regularly spaced grid of points, given an arbitrary velocity field sampled at these points. The computational cost of finding each traveltime is roughly one square root operation.

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Applications of full wave methods

The Propagation of Radio Waves ◽

10.1017/cbo9780511564321.020 ◽

1985 ◽

pp. 583-608

Keyword(s):

Full Wave ◽

Wave Methods

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Full wave methods for anisotropic stratified media

The Propagation of Radio Waves ◽

10.1017/cbo9780511564321.019 ◽

1985 ◽

pp. 550-582

Keyword(s):

Stratified Media ◽

Full Wave ◽

Wave Methods

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Comparison between two different full-wave methods for the computation of nonlinear ultrasound fields in inhomogeneous and attenuating tissue

2014 IEEE International Ultrasonics Symposium ◽

10.1109/ultsym.2014.0362 ◽

2014 ◽

Cited By ~ 1

Author(s):

L. Demi ◽

B.E. Treeby ◽

M.D. Verweij

Keyword(s):

Nonlinear Ultrasound ◽

Full Wave ◽

Wave Methods

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Designing 6–18 GHz Microstrip Filters with Removing Unwanted Upper and Lower Band Frequency Responses and with Arbitrary Load Impedance Matching

Journal of Circuits System and Computers ◽

10.1142/s0218126621501310 ◽

2020 ◽

pp. 2150131

Author(s):

Alireza Sharifi

Keyword(s):

Impedance Matching ◽

Computer Code ◽

Optimization Method ◽

Ultra Wideband ◽

Load Impedance ◽

Band Frequency ◽

Arbitrary Load ◽

Frequency Responses ◽

Full Wave ◽

Wave Methods

In this paper, Ultra-Wideband (UWB) filters at 6–18[Formula: see text]GHz are designed that can reduce undesired frequency responses at lower and upper frequency bands to less than [Formula: see text]20[Formula: see text]dB. Arbitrary load impedances are considered in the design of these filters. The structure of these filters is the combination of microstrip band-pass filters and Defected Ground Structures (DGSs) with multiple sections. The optimum circuit dimensions are calculated using a computer code which implements the Least Mean Squares (LMS) optimization method. Two design examples are included to illustrate this method. In these examples, eight-section DGS structures are employed to eliminate the unwanted upper frequency band responses. To ensure the correct performance of the designed filters, they are analyzed using full-wave methods and fabrication and the results of the measurement or full-wave analysis shows good agreement with the results of the computer code and the circuit model simulations.

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Lightning Response of Multi-Port Grids Buried in Dispersive Soils: An Approximation versus Full-wave Methods and Experiment

Advanced Electromagnetics ◽

10.7716/aem.v8i1.894 ◽

2019 ◽

Vol 8 (1) ◽

pp. 43-50 ◽

Cited By ~ 3

Author(s):

S. S. Sajjadi ◽

S. R. Ostadzadeh

Keyword(s):

Transmission Line ◽

Transient Analysis ◽

Transmission Line Model ◽

Electrical Parameters ◽

Full Wave ◽

Grounding Grids ◽

Wave Methods ◽

Dispersive Soils ◽

Good Agreement ◽

Dispersive Soil

In this paper, application of multi-conductor transmission line model (MTL) in transient analysis of grounding grids buried in soils with frequency-dependent electrical parameters (dispersive soil) is investigated. In this modeling approach, each set of parallel conductors in the grounding grid is considered as a multi-conductor transmission line (MTL). Then, a two-port network for each set of parallel conductors in the grid is then defined. Finally, the two-port networks are interconnected depending upon the pattern of connections in the grid and its representative equations are then reduced. Via solving these simplified equations, the transient analyses of grounding grids is efficiently carried out. With the aim of validity, a number of examples previously published in literature are selected. The comparison of simulation results based on the MTL shows good agreement with numerical and experimental results. Moreover, in despite of numerical methods computational efficiency is considerably increased.

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