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Andrea Adriani, Stefano Serra-Capizzano and Cristina Tablino-Possio
We consider the Helmholtz equation and the fractional Laplacian in the case of the complex-valued unbounded variable coefficient wave number μ" role="presentation" style="position: relative;">??µ
µ
, approximated by finite differences. In a rec...
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Yuri Kuzmin and Stanislav Proshkin
Based on a rigorous solution to the problem, analytical expressions are obtained for calculating the diffraction of the electromagnetic field of a grounded cable on an elongated dielectric spheroid in a conductive layer. The field of a grounded AC cable ...
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Maxim Protasov, Kirill Gadylshin, Dmitry Neklyudov and Ludek Klimes
This study considers the full waveform inversion (FWI) method based on the asymptotic solution of the Helmholtz equation. We provide frequency-dependent ray tracing to obtain the wave field used to compute the FWI gradient and calculate the modeled data....
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Petr Krysl and Ahmad T. Abawi
Computing the backscattering of harmonic acoustic waves from underwater elastic targets of arbitrary shapes is a challenging problem of considerable practical significance. The finite element method is well suited for the discretization of the target, wh...
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Mami Shiraishi, Katsuaki Mishima, Masahiro Takekawa, Masaaki Mori and Hirotsugu Umeda
This study aimed to establish and verify the validity of an acoustic simulation method during sustained phonation of the Japanese vowels /i/ and /u/. The study participants were six healthy adults. First, vocal tract models were constructed based on comp...
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Kleber de Almeida Gonçalves, Daniela Silva Santurio, Delfim Soares, Pedro Alves Costa and Luís Godinho
The use of boundary elements in the analysis of exterior acoustic problems poses challenges at specific frequencies, since fictitious eigenfrequencies may arise at the internal resonances of cavities, leading to inaccurate results or even unstable behavi...
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Xuanye Liang, Lijun Yang, Gaofeng Wang and Jingxuan Li
The bifurcation process of self-sustained combustion instability pressure perturbations in a liquid rocket combustor is investigated based on the Helmholtz equations and a pressure dependent flame describing function. The modal frequency and growth rates...
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Yushan Gao, Bingbing Zhang, Jinbo Cheng, Jingxuan Li and Qingfei Fu
Combustion instability is the biggest threat to the reliability of liquid rocket engines, whose prediction and suppression are of great significance for engineering applications. To predict the stability of a combustion chamber with a hypergolic propella...
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Dmitry Losev,Dmitry Bardashov
Pág. 1 - 4
The approximated solution of wave propagation problem in smooth heterogeneous media by use of the iterated kernels method is proposed. It represents the result of iterated method application to the integral equation equivalent to the Helmholtz scalar equ...
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D.V. Losev,D.S. Bardashov
Pág. 8 - 11
AThe approximated solution of the wave propagation problem in smoothly heterogeneous medium on the basis of the method of iterated kernels is proposed in this article. The solution is obtained by the method of successive approximations to an integral equ...
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