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International Journal for Multiscale Computational Engineering

Erscheint 6 Ausgaben pro Jahr

ISSN Druckformat: 1543-1649

ISSN Online: 1940-4352

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 1.4 To calculate the five year Impact Factor, citations are counted in 2017 to the previous five years and divided by the source items published in the previous five years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) 5-Year IF: 1.3 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 2.2 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00034 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.46 SJR: 0.333 SNIP: 0.606 CiteScore™:: 3.1 H-Index: 31

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A FICTITIOUS SOURCE METHOD FOR A MULTIFREQUENCY ACOUSTIC SOURCE OVER GROUND WITH VARIABLE IMPEDANCE

Volumen 17, Ausgabe 6, 2019, pp. 563-582
DOI: 10.1615/IntJMultCompEng.2019030576
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ABSTRAKT

Finding the sound pressure level (SPL) distribution near the ground due to aircraft noise is an important problem in environmental engineering. Since the human hearing range is very wide, ranging from 20 Hz to 20 kHz, the determination of the SPL distribution for a given source spectrum is a difficult multiscale problem, and requires the repeated solution, for many different wave numbers, of the Helmholtz equation in the upper half space, while imposing a given impedance boundary condition on the ground. Previously, a simple computational scheme, based on the use of fictitious sources, was proposed for the efficient solution of such problems, for aflat ground with a given constant impedance. In the present study, this scheme is improved and extended in several ways. First, the ground impedance is allowed to vary with location, representing a varying type of ground (soil, water, asphalt, etc.). Second, a mechanism for verification of the method and for error estimation is developed, whereas previously only the boundary condition residual was evaluated. Third, the use of the appropriate Green's function, associated with a ringlike source, is made precise. Two simplifying assumptions which are maintained are that the ground is flat and that its impedance function is axially symmetric. Numerical experiments are used to demonstrate the performance of the scheme.

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