On the Long Range Propagation of Sound Over Irregular Terrain PDF Download
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Author: M. S. Howe
Publisher:
ISBN:
Category : Acoustical engineering
Languages : en
Pages : 44
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Book Description
Author: M. S. Howe
Publisher:
ISBN:
Category : Acoustical engineering
Languages : en
Pages : 44
Get Book Here
Book Description
Author: M. S. Howe
Publisher:
ISBN:
Category : Acoustical engineering
Languages : en
Pages : 44
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Book Description
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722750305
Category :
Languages : en
Pages : 56
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Book Description
Theoretical, computational, and experimental techniques were developed for predicting the effects of irregular topography on long range sound propagation in the atmosphere. Irregular topography is understood to imply a ground surface that: (1) is not idealizable as being perfectly flat, or (2) that is not idealizable as having a constant specific acoustic impedance. The focus is on circumstances where the propagation is similar to what might be expected for noise from low altitude air vehicles flying over suburban or rural terrain, such that rays from the source arrive at angles close to grazing incidence. Berthelot, Yves H. and Pierce, Allan D. and Kearns, James A. and Zhou, Ji-Xun Unspecified Center...
Author: Santosh Parakkal
Publisher:
ISBN:
Category :
Languages : en
Pages : 212
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Book Description
The aim of this work is to establish an accurate and practical numerical method to determine the acoustic field at any point on the Earth's surface in the presence of range-dependent (atmosphere and terrain) conditions. In the sound propagation over irregular terrain, the approach is to map the terrain coordinates in to a flat or smooth earth coordinate system. This results in a modified parabolic equation (PE) which is subjected to modified surface boundary conditions. The Beilis and Tappert PE method is studied in applications of sound propagation over irregular terrain. The correct ground impedance boundary condition for porous ground is derived and applied to the propagation predictions over hills with different slope angles. The Generalized Polar Coordinate parabolic equation method (Polar-PE method) was developed partly to provide a very solid numerical benchmark to the Beilis and Tappert PE method. The Polar-PE method makes it possible to compute sound propagation over arbitrary large-scale terrain where the local radii of curvature are large compared to the acoustic wavelength. Both approaches are outlined and a comparison is made of the accuracy and computational demands of the methods. Also, the theoretical predictions from the two methods are compared to acoustic field measurements.
Author: Keith Attenborough
Publisher: CRC Press
ISBN: 0203088735
Category : Technology & Engineering
Languages : en
Pages : 499
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Book Description
Predicting Outdoor Sound provides a scholarly yet practical examination of the phenomena that affect outdoor sound close to the ground and its prediction. It is devoted to bringing together theories and data to give both researchers and practitioners the basis for deciding which model to use in a given situation. The book covers recent advances in theory, new and old empirical schemes, available data and comparisons between theory and data. Detailed case studies of predictions and their uses are presented. There are chapters on ground impedance models and data, methods of measuring ground impedance, ground effects in homogenous atmospheres, sound propagation in refracting and turbulent atmospheres, sound propagation from moving sources, the performance of outdoor noise barriers, the effects of tall vegetation and both numerical and empirical methods for predicting the various influences on outdoor sound. International in its applications, and written by authors who have been key in many of the recent advances, Predicting Outdoor Sound is a definitive reference for the acoustic engineer.
Author:
Publisher:
ISBN:
Category : Astronautics
Languages : en
Pages : 548
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Author: Moises Levy
Publisher: Academic Press
ISBN: 0080924255
Category : Technology & Engineering
Languages : en
Pages : 2513
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Book Description
Sound waves propagate through galactic space, through two-dimensional solids, through biological systems, through normal and dense stars, and through everything that surrounds us; the earth, the sea, and the air. We use sound to locate objects, to identify objects, to understand processes going on in nature, to communicate, and to entertain. The elastic properties of materials determine the velocity of sound in them and tell us about their response to stresses something which is very important when we are trying to construct, manufacture, or create something with any material. The Handbook of Elastic Properties of Materials will provide these characteristics for almost everything whose elastic properties has ever been measured or deduced in a concise and approachable manner. Leading experts will explain the significance of the elastic properties as they relate to intrinsic microscopic behavior, to manufacturing, to construction, or to diagnosis. They will discuss the propagation of sound in newly discovered or created materials, and in common materials which are being investigated with a fresh outlook. The Handbook will provide the reader with the elastic properties of the common and mundane, the novel and unique, the immense and the microscopic, and the exhorbitantly dense and the ephemeral.. You will also find the measurement. And theoretical techniques that have been developed and invented in order to extract these properties from a reluctant nature and recalcitrant systems. Key Features * Solids, liquids and gases covered in one handbook * Articles by experts describing insights developed over long and Illustrious careers * Properties of esoteric substances, such as normal and dense stars, superfluid helium three, fullerness, two dimensional solids, extraterrestial substances, gems and planetary atmospheres * Properties of common materials such as food, wood used for musical instruments, paper, cement, and cork * Modern dynamic elastic properties measurement techniques
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 704
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 416
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Author:
Publisher:
ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 1052
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Book Description
