About Book

Beginning with its origins in the study of mechanical vibrations and the radiation of these vibrations through mechanical waves, acoustics has had important applications in almost every area of life. Acoustics is a branch of physics that studies sound, or more precisely, mechanical waves in gases, liquids and solids. The science of acoustics spreads across many facets of human society-music, medicine, architecture, industrial production, warfare and more. The scope of acoustics has been extended to higher and lower frequencies: ultrasound and infrasound. Structural vibrations are now often included in acoustics. Also, the perception of sound is an area of acoustical research. Other applications of acoustic technology are in the study of geologic, atmospheric, and underwater phenomena. This book covers theoretical and experimental aspects of acoustics, providing state-of-the-art coverage of research findings for engineers and scientists involved in applications of acoustics in the widest sense. It deals with topics such as acoustic quality, acoustics optimization, vibro-acoustics, acoustics in optical fiber, acoustics modelling, aeroacoustics, biological structures and surface acoustic. It looks not only at recent developments in the understanding of acoustics but also at ways of exploiting that understanding. Coherent flow of topics, student-friendly language and extensive use of examples make this book an invaluable source of knowledge. It aims to serve as a resource guide for students and facilitate the study of the discipline.

Preface............................................................................................................v

Chapter 1 Acoustics from Interior Designer Perspective.....................................1

Abstract...................................................................................................1

1. Introduction............................................................................................1

2. Acoustics and related field of specializations.................................2

3. Acoustical interior design elements................................................10

4. Interior acoustical design criterion..................................................16

5. Conclusion............................................................................................20

Acknowledgements.............................................................................20

Nomenclature.......................................................................................20

Chapter 2 Acoustics and Biological Structures.....................................................23

Abstract.................................................................................................23

1. Introduction..........................................................................................23

2. Biomaterials and human anatomy...................................................27

3. Laboratorial studies, field studies, and biological outcomes.....29

4. Past relevant studies...........................................................................33

5. Conclusions..........................................................................................45

Conflict of interest..............................................................................46

Chapter 3 Progress in Experimental Research of Turbine Aeroacoustics......52

Abstract ................................................................................................52

1. Introduction..........................................................................................52

2. Experimental setups and test facilities...........................................54

3. Acoustic analysis theoretical background......................................61

4. Research on TECs................................................................................64

5. Research on TCFs.................................................................................73

6. Conclusions..........................................................................................81

7. Nomenclature.......................................................................................83

Chapter 4 Underwater Acoustics Modeling in Finite Depth Shallow

Waters ........................................................................................................88

1. Introduction..........................................................................................88

2. Shallow waters ...................................................................................89

3. Approximate methods in shallow-water acoustics .....................94

4. Final considerations .......................................................................101

Chapter 5 Acoustics in Optical Fiber....................................................................103

1. Introduction........................................................................................103

2. Acousto-optic tunable filter.............................................................104

3. Tuning of attenuation depth .........................................................107

4. Tuning of 3-dB bandwidth ............................................................110

5. Double-pass configuration .............................................................112

6. Gain flattening filter ........................................................................114

7. Conclusion .........................................................................................119

Chapter 6 Acoustics and Vibro-Acoustics Applied in Space Industry.........123

1. Introduction........................................................................................123

2. External on board microphones installation devices.................125

3. Vibro-acoustic modelling of payload fairings (PLF)..................133

4. Combustion instabilities of liquid propelled rocket engines due

to chamber combustion acoustics..................................................150

5. Conclusions........................................................................................159

Chapter 7 Stochastic Based Simulations and Measurements of Some Objective

Parameters of Acoustic Quality: Subjective Evaluation of Room

Acoustic Quality with Acoustics Optimization in Multimedia

Classroom (Analysis with Application)............................................164

1. Introduction........................................................................................164

2. Introduction to analysis ..................................................................167

3. Subjective evaluation of room acoustic quality parameters ...168

4. Objective measurements of room acoustic quality

parameters .........................................................................................171

5. Statistical based analysis - first conclusion ................................173

6. Introduction to application: Acoustics based optimization in

multimedia classroom......................................................................173

7. Predicting measures for checking acquired acoustic quality in a

classroom ...........................................................................................174

8. Predictions, stochastic based simulations and measurements in

the sample multimedia room.........................................................175

9. Acoustics optimization in multimedia classroom as an application

- second conclusion .........................................................................183

10. Conclusion..........................................................................................184

Chapter 8 Surface Acoustic Wave Devices for Harsh Environment..............187

1. Introduction........................................................................................187

2. AlN-based SAW devices..................................................................190

3. Materials and methods....................................................................195

4. Conclusions........................................................................................204

5. Acknowledgements...........................................................................205

Citation......................................................................................................209

Index...........................................................................................................211

About Author

Harvey Moreira serves as a Guest Lecturer at Technical Institute, Andalusia. He has received his Ph.D. in Electrical Engineering from Public University of Science, Madeira. He has written a number of articles, and research papers in peer-reviewed journals on mechanical waves, electromagnetic waves, theory of fourier analysis, architectural acoustics, noise and vibration control engineering, and electroacoustics. His current research interests include wireless communications, microwave and millimeter-wave sensing for biomedical and security applications, microwave and millimeter-wave devices and integrated circuits for instrumentation applications. Moreira has been an invited speaker at various national and international conferences.