Atmospheric and Terrain Effects on Acoustic Propagation PDF Download
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Author: M. West
Publisher:
ISBN:
Category : Atmosphere
Languages : en
Pages : 0
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Book Description
Author: M. West
Publisher:
ISBN:
Category : Atmosphere
Languages : en
Pages : 0
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Book Description
Author: M. West
Publisher:
ISBN:
Category : Atmosphere
Languages : en
Pages :
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Author: Thomas Rossing
Publisher: Springer Science & Business Media
ISBN: 0387304460
Category : Science
Languages : en
Pages : 1179
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Book Description
This is an unparalleled modern handbook reflecting the richly interdisciplinary nature of acoustics edited by an acknowledged master in the field. The handbook reviews the most important areas of the subject, with emphasis on current research. The authors of the various chapters are all experts in their fields. Each chapter is richly illustrated with figures and tables. The latest research and applications are incorporated throughout, including computer recognition and synthesis of speech, physiological acoustics, diagnostic imaging and therapeutic applications and acoustical oceanography. An accompanying CD-ROM contains audio and video files.
Author: E.M. Salomons
Publisher: Springer Science & Business Media
ISBN: 9401006601
Category : Science
Languages : en
Pages : 331
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Book Description
Noise from cars, trains, and aeroplanes can be heard at large distances from the source. Accurate predictions of the loudness of the noise require accurate computations of sound propagation in the atmosphere. This book describes models that can be used for these computations. The models take into account complex effects of the atmosphere and the ground surface on sound waves, including the effects of wind and temperature distributions, atmospheric turbulence, irregular terrain, and noise barriers. The main text of the book focuses on physical effects in atmospheric acoustics. The effects are illustrated by many numerical examples. The main text requires a very limited mathematical background from the reader; detailed mathematical descriptions of the models, developed from the basic principles of acoustics, are presented in appendices. Models for moving media are compared with models that are based on the effective sound speed approach. Both two-dimensional models and three-dimensional models are presented. As meteorological effects play an important role in atmospheric acoustics, selected topics from boundary layer meteorology and the theory of turbulence are also presented.
Author:
Publisher:
ISBN:
Category : Airplane sounds
Languages : en
Pages : 206
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Book Description
Author: Nathan Tipton
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
As industrial technology advances, man-made noise has increasingly contributed to natural soundscapes. To predict how anthropogenic noise can affect natural environments, engineers build acoustic models over a given terrain; however, many current models are not compatible with common Geographic Information System (GIS) software and become outdated due to software version updates, or are written as proprietary packages unavailable to park management. The goal of this study was to create a true open source outdoor sound propagation model compatible with (but not dependent on) outside GIS software. The model was developed using algorithms from ISO 9613-2, an international standard for attenuation of sound during propagation outdoors. The standard accounts for uneven terrain, atmospheric absorption, screening, wind effects, and ground effects; however, the scope of this thesis is limited to the initial three attenuation factors. Geometric and atmospheric attenuation were directly translatable to a three-dimensional terrain. Additional software was developed in order to translate the two-dimensional screening algorithms for simple terrains to three-dimensional complex terrains. Given sound source inputs and locations over an input Digital Elevation Map, GIS compatible file types of spatially explicit sound pressure level predictions were produced by this model. The model was tested using simple simulated terrains of known ISO 9613-2 cases: one barrier and two barriers. Additionally, the model produced preliminary results using real terrain data and natural gas compressor noise as the sound source. Sound maps were displayed over satellite imagery of the sound pressure level data, and a correlation of visitor acceptability to the sound. The results produced by this work demonstrate a preliminary version of an open-source outdoor sound predictive tool with the capability of mapping visitor experience.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1028
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: Thyagaraju Damarla
Publisher: Springer
ISBN: 3319160362
Category : Technology & Engineering
Languages : en
Pages : 267
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Book Description
This book presents all aspects of situational awareness using acoustic signals. It starts by presenting the science behind understanding and interpretation of sound signals. The book then goes on to provide various signal processing techniques used in acoustics to find the direction of sound source, localize gunfire, track vehicles and detect people. The necessary mathematical background and various classification and fusion techniques are presented. The book contains majority of the things one would need to process acoustic signals for all aspects of situational awareness in one location. The book also presents array theory, which is pivotal in finding the direction of arrival of acoustic signals. In addition, the book presents techniques to fuse the information from multiple homogeneous/heterogeneous sensors for better detection. MATLAB code is provided for majority of the real application, which is a valuable resource in not only understanding the theory but readers can also use the code as a spring-board to develop their own application based software code.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 64
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Book Description
Propagation of acoustic waves in the atmosphere is affected by several mechanisms. Two of the effects are the scattering of sound by small-scale atmospheric turbulence and fluctuation of the speed of sound gradients by the passage of large-scale atmospheric turbulence. Small- and large-scale atmospheric turbulence causes the acoustic waves to be altered by different mechanisms. Until recently, the majority of work in turbulence effect on acoustics has concentrated on the small-scale turbulence regime of the inertial subrange of the Kolmogorov spectrum. Earlier small-scale turbulence models have concentrated on the statistical-based work of Tatarski. Current turbulence models deal more with the structural nature of the turbulence because the statistical approach does not account for all of the turbulence effects being measured during acoustic propagation experiments. The large-scale turbulence problem cannot be handled very well with a statistical approach to atmospheric turbulence because the regime of the large-scale turbulence extends into the energy containing subrange or sometimes referred to as the source region. This report discusses the current and past turbulence models used to treat the effect of small- and large-scale turbulence on atmospheric acoustic propagation. (AN).
Author: Richard N. Tedrick
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 132
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Book Description
