Aeroacoustic Measurements
Aeroacoustic Measurements

Author: Thomas J. Mueller

Publisher: Springer Science & Business Media

Published: 2013-11-27

Total Pages: 327

ISBN-13: 3662050587

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The book describes recent developments in aeroacoustic measurements in wind tunnels and the interpretation of the resulting data. The reader will find the latest measurement techniques described along with examples of the results.

Modern Acoustical Techniques for the Measurement of Mechanical Properties
Modern Acoustical Techniques for the Measurement of Mechanical Properties

Author:

Publisher: Elsevier

Published: 2001-10-16

Total Pages: 457

ISBN-13: 0080531407

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This volume provides an overview of modern acoustical techniques for the measurement of mechanical properties. Chapters include Fundamentals of Elastic Constants; Point Source/Point Receiver Methods; Laser Controlled Surface Acoustic Waves; Quantitative Acoustical Microscopy of Solids; Resonant Ultrasound Spectroscopy; Elastic Properties and Thermodynamics; Sound Speed as a Thermodynamic Property of Fluids; Noninvasive Determination of Sound Speed in Liquids; Introduction to the Elastic Constants of Gases; and Acoustic Measurement in Gases.

Electromagnetic Acoustic Transducers
Electromagnetic Acoustic Transducers

Author: Masahiko Hirao

Publisher: Springer

Published: 2016-10-25

Total Pages: 382

ISBN-13: 443156036X

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This second edition provides comprehensive information on electromagnetic acoustic transducers (EMATs), from the theory and physical principles of EMATs to the construction of systems and their applications to scientific and industrial ultrasonic measurements on materials. The original version has been complemented with selected ideas on ultrasonic measurement that have emerged since the first edition was released. The book is divided into four parts: PART I offers a self-contained description of the basic elements of coupling mechanisms along with the practical designing of EMATs for various purposes. Several implementations to compensate for EMATs’ low transfer efficiency are provided, along with useful tips on how to make an EMAT. PART II describes the principle of electromagnetic acoustic resonance (EMAR), which makes the most of EMATs’ contactless nature and is the most successful amplification mechanism for precise measurements of velocity and attenuation. PART III applies EMAR to studying physical acoustics. New measurements have emerged with regard to four major subjects: in situ monitoring of dislocation behavior, determination of anisotropic elastic constants, pointwise elasticity mapping (RUM), and acoustic nonlinearity evolution. PART IV deals with a variety of individual issues encountered in industrial applications, for which the EMATs are believed to be the best solutions. This is proven by a number of field applications.

Urban Sound Environment
Urban Sound Environment

Author: Jian Kang

Publisher: CRC Press

Published: 2006-09-27

Total Pages: 305

ISBN-13: 0203004787

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Over the past two decades there have been many major new developments in the field of urban sound environment. Jian Kang introduces and examines these key developments, including: the development of prediction methods for urban sound propagation establishment and application of noise-mapping software new noise control measures and design methods. Also covered is the new EU directive on noise and the substantial actions it has brought about across Europe. As the importance of soundscape, acoustic comfort and sound environment design have become widely recognized, Urban Sound Environments is a thoroughly useful book for students and practitioners in a wide range of fields, from urban planning and landscape through to architecture and acoustics.

Directivity Patterns for Room Acoustical Measurements and Simulations
Directivity Patterns for Room Acoustical Measurements and Simulations

Author: Martin Pollow

Publisher: Logos Verlag Berlin GmbH

Published: 2015-09-09

Total Pages: 192

ISBN-13: 3832540903

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The acoustics of rooms can be objectively described by the room impulse responses obtained for given transfer paths using measurement or simulation. In practice, the directionally dependent behavior of sources and receivers is often disregarded and thus assumed to be of omnidirectional type. In reality, however, these sources and receivers have specific directivity patterns, which are reported to induce audible differences. In this work a methodology to capture, analyze and process directivity patterns of sources and receivers is described. With the help of surrounding spherical microphone and loudspeaker arrays these directivity patterns are measured to be used in room acoustic applications. Room impulse responses with respect to specific directivity patterns can be realized using compact loudspeaker arrays with known directivity. Applying the results of directivity superposition to the set of measured room impulse responses, the acoustics for specific directivity patterns are found. Using a simulation of the room instead, source and receiver directivity patterns can be included in both wave based and particle based methods. The results of this work facilitate more authentic descriptions of room acoustics for specific source and receiver directivity patterns.