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UID:0-490@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20151118T163000

DTEND;TZID=Asia/Jerusalem:20151118T173000

DTSTAMP:20230603T192014Z

URL:https://aerospace.technion.ac.il/events/fictitious-sources-method-for-
 noise-level-analysis-from-an-aircraft-flying-at-a-given-altitude-above-a-g
 round-with-variable-impedance-and-topography/

SUMMARY:Fictitious Sources Method for Noise Level Analysis from an Aircraft
  Flying at a Given Altitude Above a Ground with Variable Impedance and Top
 ography
DESCRIPTION:Lecturer:Yohan Kamoun\n Faculty:Department of Aerospace Enginee
 ring\n Institute:Technion – Israel Institute of Technology\n Location:Cl
 assroom 165\, ground floor\, Library\, Aerospace Eng.\n Zoom: \n Abstract:
  \n Details: \n The analysis of noise level emanating from a distant sourc
 e is needed in a number of applications\, most notably in environmental en
 gineering. The sound pressure level (SPL) distribution is desired\, e.g.\,
  due to the acute effects of sound on community. To this end\, one has to 
 solve a typically large-scale acoustics problem: a moving source over grou
 nd with given impedance and topography.\nSince the human hearing bandwidth
  is quite wide\, one has to repeatedly solve the Helmholtz equation in the
  upper half space for many different wave lengths\, with given impedance b
 oundary condition imposed on the ground. To this end\, an efficient Helmho
 ltz equation solver must be used.\nIn recent years\, fictitious source met
 hods (FSM) have been developed and applied for various problems such as ac
 oustic and electromagnetic wave problems. For a flat ground with a zero or
  infinite impedance\, basic fictitious source implementation can easily gi
 ve a semi-analytical solution to the Helmholtz problem using the mirror im
 age method. For a variable impedance or for ground with given topography\,
  the problem becomes much more complex\, and a numerical solution is requi
 red. The use of the FSM was previously proven to be efficient for the case
  of a flat ground with a constant impedance.\nIn this Seminar we will pres
 ent an extension to the previous work in the following main aspects:\n\n\n
 	The ground impedance may be a function of location.\n	Topography: the gro
 und may be non-flat\n\nIn contrast to the previous works\, where only the 
 residual was calculated\, it is now possible to evaluate the true error ge
 nerated by the fictitious source method using a dedicated algorithm.
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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DTSTART:20151025T010000

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