Estimating Acoustic Performance Trends Of Various Asphalt Surface Mixtures Based On Field Measurement
DOWNLOAD
Download Estimating Acoustic Performance Trends Of Various Asphalt Surface Mixtures Based On Field Measurement PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Estimating Acoustic Performance Trends Of Various Asphalt Surface Mixtures Based On Field Measurement book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
Estimating Acoustic Performance Trends Of Various Asphalt Surface Mixtures Based On Field Measurement
DOWNLOAD
Author : Qing Lu
language : en
Publisher:
Release Date : 2012
Estimating Acoustic Performance Trends Of Various Asphalt Surface Mixtures Based On Field Measurement written by Qing Lu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Asphalt mixture categories.
As one measure to reduce traffic noise, designing a noise-reducing ("quiet") pavement surface has received increasing attention. For asphalt pavements, some existing asphalt mixtures have shown better noise-reducing capabilities than conventional dense-graded asphalt concrete (DGAC) pavements. To design a new asphalt mixture optimized for noise reduction, the acoustic performance of existing asphalt-surface mixtures needs to be evaluated and understood. For this purpose, a study was conducted to measure tire/pavement noise on a variety of asphalt pavements for four consecutive years. The tire/pavement noise was measured with an on-board sound-intensity (OBSI) method that was continuously improved during the study. Regression analysis was applied to determine the levels and increase rates of tire/pavement noise on four major asphalt mixtures, and the effects of mix design variables on tire/pavement noise. Results show that tire/pavement noise generally increases with pavement age on all types of asphalt pavements. For newly placed or overlaid pavements, open-graded or rubberized gap-graded mixtures exhibit lower noise levels than conventional dense-graded asphalt mixture. Open-graded asphalt mixtures can retain noise-reduction benefit for a longer period than gap-graded mixtures. Using rubberized binders in the open-graded mixtures can further reduce the noise-increase rate. Pavement surface permeability, macrotexture, and existing surface distresses may affect the tire/pavement noise level.
Acoustic Absorption Analysis And Modeling Of Asphalt Mixtures
DOWNLOAD
Author : Wahid Hassan
language : en
Publisher:
Release Date : 2019
Acoustic Absorption Analysis And Modeling Of Asphalt Mixtures written by Wahid Hassan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Asphalt emulsion mixtures categories.
Highway traffic noise is a major environmental issue all over the world. This is particularly annoying to residents who live nearby major transportation corridors. Noise pollution adversely affects the quality of their life. It also causes sleep disturbance and anxiety. The most commonly used noise abatement technique is the use of noise barrier walls, which is costly and not always effective. Reducing the tirepavement noise at the source is a viable alternative to cut down the noise level. This study examined the use of an impedance tube to measure the acoustic absorption of asphalt mixtures in the laboratory. The effect of various parameters on the acoustic absorption was investigated including aggregate gradation, aggregate type, binder type, percent air voids, and specimen thickness. In addition, factors that could affect the acoustical performance of asphalt mixtures after pavement construction were also investigated including air void structure, surface texture, temperature, and surface conditions. Percent air voids and layer thickness were found to have a significant influence on the acoustic absorption of asphalt mixtures. An analytical model was proposed to estimate the acoustic absorption coefficient of asphalt mixtures during the design stage. A good correlation was found between predicted and measured absorption coefficients in the laboratory. In addition, a double-layer system of asphalt mixtures was found to be effective in providing improved acoustical performance that overcomes the issues associated with the use of open-graded friction course as a wearing surface.
Evaluation Of Acoustic Absorption Characteristics Of Asphalt Mixtures
DOWNLOAD
Author : Wahid Hassan
language : en
Publisher:
Release Date : 2018
Evaluation Of Acoustic Absorption Characteristics Of Asphalt Mixtures written by Wahid Hassan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with Pavements, Asphalt categories.
Highways traffic noise is a major issue all over the world. It is annoying to the residents who live nearby major transportation corridors. Noise pollution adversely affects the quality of their life. It also causes sleep disturbance and anxiety. Some of the noise abatement techniques such as noise barrier walls are costly and not effective all the times. Reducing the tire-pavement noise at the source is viable alternative to cut down the noise level. This study examined the use of impedance tube to measure the acoustic absorption of asphalt mixtures in the laboratory. The effect of various parameters on the acoustic absorption was investigated including aggregate gradation, aggregate type, binder type, percent air voids, and sample thickness. In addition, factors that could affect the acoustical performance of asphalt mixtures after pavement construction was also investigated including air void structure, surface texture, temperature, and surface conditions. Percent air voids and layer thickness were found to have a significant influence on the acoustic absorption of asphalt mixtures. An analytical model was proposed to estimate the acoustic absorption coefficient of asphalt mixtures during the design stage. A good correlation was found between predicted and measured absorption coefficients in the laboratory. In addition, a double-layer system of asphalt mixtures was found to be effective in providing improved acoustical performance that overcomes the issues associated with the use of open graded friction course as a wearing surface.
Electrical Measuring Instruments And Measurements
DOWNLOAD
Author : S.C. Bhargava
language : en
Publisher: CRC Press
Release Date : 2012-12-27
Electrical Measuring Instruments And Measurements written by S.C. Bhargava and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-27 with Computers categories.
This book, written for the benefit of engineering students and practicing engineers alike, is the culmination of the author's four decades of experience related to the subject of electrical measurements, comprising nearly 30 years of experimental research and more than 15 years of teaching at several engineering institutions. The unique feature of this book, apart from covering the syllabi of various universities, is the style of presentation of all important aspects and features of electrical measurements, with neatly and clearly drawn figures, diagrams and colour and b/w photos that illustrate details of instruments among other things, making the text easy to follow and comprehend. Enhancing the chapters are interspersed explanatory comments and, where necessary, footnotes to help better understanding of the chapter contents. Also, each chapter begins with a "recall" to link the subject matter with the related science or phenomenon and fundamental background. The first few chapters of the book comprise "Units, Dimensions and Standards"; "Electricity, Magnetism and Electromagnetism" and "Network Analysis". These topics form the basics of electrical measurements and provide a better understanding of the main topics discussed in later chapters. The last two chapters represent valuable assets of the book, and relate to (a) "Magnetic Measurements", describing many unique features not easily available elsewhere, a good study of which is essential for the design and development of most electric equipment – from motors to transformers and alternators, and (b) "Measurement of Non-electrical Quantities", dealing extensively with the measuring techniques of a number of variables that constitute an important requirement of engineering measurement practices. The book is supplemented by ten appendices covering various aspects dealing with the art and science of electrical measurement and of relevance to some of the topics in main chapters. Other useful features of the book include an elaborate chapter-by-chapter list of symbols, worked examples, exercises and quiz questions at the end of each chapter, and extensive authors' and subject index. This book will be of interest to all students taking courses in electrical measurements as a part of a B.Tech. in electrical engineering. Professionals in the field of electrical engineering will also find the book of use.
Asphalt Mixture Specification And Testing
DOWNLOAD
Author : Cliff Nicholls
language : en
Publisher: CRC Press
Release Date : 2017-05-12
Asphalt Mixture Specification And Testing written by Cliff Nicholls and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-05-12 with Technology & Engineering categories.
This guide reviews the way asphalt mixture can be specified, with particular emphasis on the test methods used to measure performance. The advantages and limitations of the tests are described for measuring the desired property, and engineers can specify a test according to the material’s use. The book starts with a resume of specifications and their relative advantages and disadvantages for different situations. Then different properties are discussed in terms of: their specification; the test methods that can be used (primarily the EN 12697 suite of European methods, of which the author has been responsible for drafting); the extent to which the results predict performance; the levels that can be achieved with different asphalt mixes and types; what levels, if any, should be specified in various situations and pavement layers; and which other properties are adversely affected by enhanced performance. The final section covers various aspects of sustainability, with a strong emphasis on durability. Better understanding should enable clients and consultants who specify pavements to produce durable asphalt pavements more economically, and also help asphalt producers and students trying to understand the black art of asphalt.
Itec Asia 2001
DOWNLOAD
Author : iSmithers Rapra Publishing
language : en
Publisher: iSmithers Rapra Publishing
Release Date : 2001-12-31
Itec Asia 2001 written by iSmithers Rapra Publishing and has been published by iSmithers Rapra Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001-12-31 with categories.
Tyre Road Noise
DOWNLOAD
Author : Ulf Sandberg
language : en
Publisher:
Release Date : 2002
Tyre Road Noise written by Ulf Sandberg and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Automobiles categories.
Government Reports Announcements Index
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 1993-12
Government Reports Announcements Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993-12 with Science categories.
Porous Asphalt Pavements
DOWNLOAD
Author : National Research Council (U.S.). Transportation Research Board
language : en
Publisher: Transportation Research Board National Research
Release Date : 1990
Porous Asphalt Pavements written by National Research Council (U.S.). Transportation Research Board and has been published by Transportation Research Board National Research this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Technology & Engineering categories.
Neural Networks And Learning Machines
DOWNLOAD
Author : Simon S. Haykin
language : en
Publisher: Prentice Hall
Release Date : 2009
Neural Networks And Learning Machines written by Simon S. Haykin and has been published by Prentice Hall this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Adaptive filters categories.
For graduate-level neural network courses offered in the departments of Computer Engineering, Electrical Engineering, and Computer Science. Renowned for its thoroughness and readability, this well-organized and completely up-to-date text remains the most comprehensive treatment of neural networks from an engineering perspective. Matlab codes used for the computer experiments in the text are available for download at: http: //www.pearsonhighered.com/haykin/ Refocused, revised and renamed to reflect the duality of neural networks and learning machines, this edition recognizes that the subject matter is richer when these topics are studied together. Ideas drawn from neural networks and machine learning are hybridized to perform improved learning tasks beyond the capability of either independently.