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Author : Martha J. Willis
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (267 download)
Download or read book Army Outdoor Sound Propagation Model Development written by Martha J. Willis and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Nathan Tipton
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (113 download)
Download or read book An Outdoor Sound Propagation Model in Concert with Geographic Information System Software written by Nathan Tipton and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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however, many current models are not compatible with common Geographic Information System (GIS) software and become outdated due to software version updates, or are written as proprietary packages unavailable to park management.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 : Donald Gene Albert
Publisher :
ISBN 13 :
Total Pages : 104 pages
Book Rating : 4.:/5 (298 download)
Download or read book Attenuation of Outdoor Sound Propagation Levels by a Snow Cover written by Donald Gene Albert and published by . This book was released on 1993 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 652 pages
Book Rating : 4.:/5 (319 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 : John M. Noble
Publisher :
ISBN 13 :
Total Pages : 108 pages
Book Rating : 4.:/5 (359 download)
Download or read book Evaluation of Simple Spherical Spreading Model for Near Vertical Acoustical Propagation written by John M. Noble and published by . This book was released on 1994 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comparison study was performed to evaluate the performance of a simple spherical spreading plus molecular absorption model to a more complex acoustic propagation model for near vertical propagation. The problem of near vertical propagation is important since several acoustic detection systems are being developed for the Army. The operational use of a simple acoustic propagation model in the battlefield will allow for fast computation time providing rapid evaluation of the advantage or disadvantage of using the acoustic detection system. However, simple propagation model, more complex models must be that incorporate many effects of the ground and atmosphere on the propagation of sound. This comparison will determine the limitations.
Author :
Publisher :
ISBN 13 :
Total Pages : 17 pages
Book Rating : 4.:/5 (318 download)
Download or read book Outdoor Sound Propagation Modelling in Complex Environments: Recent Developments in the Parabolic Equation Method written by and published by . This book was released on 2006 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: In complex environments the modelling of outdoor sound propagation implies to take into account the mixed influence of ground characteristics (topography, obstacles, impedance, etc.) and atmospheric conditions (refraction and turbulence). During the last decade significant progress has been made in the modelling of sound propagation over distances ranging from hundreds meters to kilometres, and the agreement between calculated and measured fields has been greatly improved. New developments appear in the parabolic-equation method. In this paper we present a method which evaluates the propagation of an acoustic wave above uneven terrains including realistic meteorological parameters. In our approach the effects of the topography are modelled using appropriate rotated co-ordinates systems in order to treat the non-flat ground as a succession of flat domains. We also examine the influence of scale resolution on numerical simulation of long range sound propagation through the turbulent atmosphere. Currently, we generate the turbulence using a Random Fourier Modes technique, such that the turbulent fluctuation at any point in the medium (either scalar or vectorial in nature) is calculated from the sum of a chosen number of modes. Our model of outdoors sound propagation is validated both with classical numerical benchmark cases and recent outdoor experiments.
Author : Harindra Joseph Fernando
Publisher : CRC Press
ISBN 13 : 1466556013
Total Pages : 591 pages
Book Rating : 4.4/5 (665 download)
Download or read book Handbook of Environmental Fluid Dynamics, Volume Two written by Harindra Joseph Fernando and published by CRC Press. This book was released on 2012-12-12 with total page 591 pages. Available in PDF, EPUB and Kindle. Book excerpt: With major implications for applied physics, engineering, and the natural and social sciences, the rapidly growing area of environmental fluid dynamics focuses on the interactions of human activities, environment, and fluid motion. A landmark for the field, the two-volume Handbook of Environmental Fluid Dynamics presents the basic principles, fundamental flow processes, modeling techniques, and measurement methods used in the study of environmental motions. It also offers critical discussions of environmental sustainability related to engineering. The handbook features 81 chapters written by 135 renowned researchers from around the world. Covering environmental, policy, biological, and chemical aspects, it tackles important cross-disciplinary topics such as sustainability, ecology, pollution, micrometeorology, and limnology. Volume Two: Systems, Pollution, Modeling, and Measurements explores the interactions between engineered structures and anthropogenic activities that affect natural flows, with particular emphasis on environmental pollution. The book covers the numerical methodologies that underpin research, predictive modeling, and cyber-infrastructure developments. It also addresses practical aspects of laboratory experiments and field observations that validate quantitative predictions and help identify new phenomena and processes. As communities face existential challenges posed by climate change, rapid urbanization, and scarcity of water and energy, the study of environmental fluid dynamics becomes increasingly relevant. This volume is a valuable resource for students, researchers, and policymakers working to better understand environmental motions and how they affect and are influenced by anthropogenic activities. See also Handbook of Environmental Fluid Dynamics, Two-Volume Set and Volume One: Overview and Fundamentals.
Author : Donald Gene Albert
Publisher :
ISBN 13 :
Total Pages : 104 pages
Book Rating : 4.:/5 (298 download)
Download or read book Attenuation of Outdoor Sound Propagation Levels by a Snow Cover written by Donald Gene Albert and published by . This book was released on 1993 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 79 pages
Book Rating : 4.:/5 (227 download)
Download or read book Development of a Multistream Acoustic Propagation Model Including Scattering by Turbulence written by and published by . This book was released on 1995 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of the ARL research effort in acoustic propagation is to provide the Army with a multistream model for investigating acoustic detection systems operating in a variety of realistic battlefield conditions. The first step is to account for scattering from turbulent regions of the atmosphere with an explicit algorithm. The turbulent region is considered to be a collection of vortices with a distribution of characteristic sizes and velocities and random orientation and position. Each vortex (turbule) is characterized as a known (or assumed) velocity distribution in three dimensional space. The scattering from each turbule is determined by solving the fluid equations. The contribution to the sound pressure level at the detector location of all turbules is summed up accounting for the propagation characteristics of the atmospheric medium. The algorithms devised to model the above picture of the turbulent region are then used in existing (or appropriately modified) propagation models. Progress in incorporating turbulence scattering into the Past Field Program (PFP) acoustic propagation model is recounted in this report. (MM).
Author : Martin Almgren
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (185 download)
Download or read book Scale Model Simulation of Outdoor Sound Propagation written by Martin Almgren and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Martin Almgren
Publisher :
ISBN 13 :
Total Pages : 98 pages
Book Rating : 4.:/5 (185 download)
Download or read book Scale Model Simulation of Outdoor Sound Propagation Under the Influence of a Sound Speed Gradient written by Martin Almgren and published by . This book was released on 1986 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Martin Almgren
Publisher :
ISBN 13 :
Total Pages : 76 pages
Book Rating : 4.:/5 (186 download)
Download or read book Scale Model Simulation of Outdoor Sound Propagation Selection of Model Ground Materials written by Martin Almgren and published by . This book was released on 1988 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Martin Almgren
Publisher :
ISBN 13 :
Total Pages : 304 pages
Book Rating : 4.:/5 (185 download)
Download or read book Scale Model Simulation of Outdoor Sound Propagation written by Martin Almgren and published by . This book was released on 1983 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Hans Georg Bock
Publisher : Springer Science & Business Media
ISBN 13 : 3642257070
Total Pages : 328 pages
Book Rating : 4.6/5 (422 download)
Download or read book Modeling, Simulation and Optimization of Complex Processes written by Hans Georg Bock and published by Springer Science & Business Media. This book was released on 2012-02-03 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: This proceedings volume contains a selection of papers presented at the Fourth International Conference on High Performance Scientific Computing held at the Hanoi Institute of Mathematics, Vietnamese Academy of Science and Technology (VAST), March 2-6, 2009. The conference was organized by the Hanoi Institute of Mathematics, the Interdisciplinary Center for Scientific Computing (IWR), Heidelberg, and its Heidelberg Graduate School of Mathematical and Computational Methods for the Sciences, and Ho Chi Minh City University of Technology. The contributions cover the broad interdisciplinary spectrum of scientific computing and present recent advances in theory, development of methods, and applications in practice. Subjects covered are mathematical modelling, numerical simulation, methods for optimization and control, parallel computing, software development, applications of scientific computing in physics, mechanics, biology and medicine, engineering, hydrology problems, transport, communication networks, production scheduling, industrial and commercial problems.
Author : D. Keith Wilson
Publisher :
ISBN 13 :
Total Pages : 9 pages
Book Rating : 4.:/5 (822 download)
Download or read book Outdoor Sound Propagation Prediction: the Challenge of Assessing Model Accuracy written by D. Keith Wilson and published by . This book was released on 2009 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 19 pages
Book Rating : 4.:/5 (945 download)
Download or read book Benchmark Cases for Outdoor Sound Propagation Models written by and published by . This book was released on 1995 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Edward M. Carapezza
Publisher : SPIE-International Society for Optical Engineering
ISBN 13 :
Total Pages : 534 pages
Book Rating : 4.F/5 ( download)
Download or read book Unattended Ground Sensor Technologies and Applications V written by Edward M. Carapezza and published by SPIE-International Society for Optical Engineering. This book was released on 2003 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt:
