Acoustics for Engineers : Troy Lectures

This book provides the material for an introductory course in engineering acoustics for students with basic knowledge in mathematics. It is based on extensive teaching experience at the university level. Under the guidance of an academic teacher it is sufficient as the sole textbook for the subject. Each chapter deals with a well defined topic and represents the material for a two-hour lecture. The 15 chapters alternate between more theoretical and more application-oriented concepts. They cover the following issues: Introduction - Mechanic and acoustic oscillators - Electromechanic and electroacoustic oscillations - Electromechanic and electroacoustic analogies - Electromechanic and electroacoustic transduction - Magnetic-field transducers - Electric-field transducers - The wave equation in fluids - Horn and stepped ducts - Spherical sound sources and line arrays - Piston membranes, diffraction and scattering - Dissipation, reflection and absorption - Geometric acoustics and diffuse sound fields - Isolation of air- and structure-borne sound - Noise control: a survey - Appendices, e.g, complex notation for sinusoidal signals, power and intensity This book provides the material for an introductory course in engineering acoustics for students with basic knowledge in mathematics. It is based on extensive teaching experience at the university level. Under the guidance of an academic teacher it is su?cient as the sole te- book for the subject. Each chapter deals with a well de?ned topic and r- resents the material for a two-hour lecture. The chapters alternate between more theoretical and more application-oriented concepts. For the purpose of self-study, the reader is advised to use this text in parallel with further introductory material. Some suggestions to this end are given in Appendix 15. 3. The authors thank Dorea Ruggles for providing substantial stylistic re?- ments. Further thanks go to various colleagues and graduate students who most willingly helped with corrections and proof reading. Nevertheless, the authors assume full responsibility for all contents. Bochum and Troy, Jens Blauert February 2008 Ning Xiang Contents 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1. 1 De?nition of Three Basic Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1. 2 Specialized Areas within Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . 3 1. 3 About the History of Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1. 4 Relevant Quantities in Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1. 5 Some Numerical Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1. 6 Levels and Logarithmic Frequency Intervals . . . . . . . . . . . . . . . . . 8 1. 7 Double-Logarithmic Plots . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2 Mechanic and Acoustic Oscillations . . . . . . . . . . . . . . . . . . . . . . . . 13 2. 1 Basic Elements of Linear, Oscillating, Mechanic Systems . . . . . 14 2. 2 Parallel Mechanic Oscillators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2. 3 Free Oscillations of Parallel Mechanic Oscillators . . . . . . . . . . . . 17 2. 4 Forced Oscillation of Parallel Mechanic Oscillators . . . . . . . . . . .

data Mining Analyzes Large Amounts Of Data To Discover Knowledge Relevant To Decision Making. Typically, Numerous Pieces Of Knowledge Are Extracted By A Data Mining System And Presented To A Human User, Who May Be A Decision-maker Or A Data-analyst. The User Is Confronted With The Task Of Selecting The Pieces Of Knowledge That Are Of The Highest Quality Or Interest According To His Or Her Preferences. Since This Selection Is Sometimes A Daunting Task, Designing Quality And Interestingness Measures Has Become An Important Challenge For Data Mining Researchers In The Last Decade.

this Volume Presents The State Of The Art Concerning Quality And Interestingness Measures For Data Mining. The Book Summarizes Recent Developments And Presents Original Research On This Topic. The Chapters Include Surveys, Comparative Studies Of Existing Measures, Proposals Of New Measures, Simulations, And Case Studies. Both Theoretical And Applied Chapters Are Included. Papers For This Book Were Selected And Reviewed For Correctness And Completeness By An International Review Committee.

Data mining analyzes large amounts of data to discover knowledge relevant to decision making. Typically, numerous pieces of knowledge are extracted by a data mining system and presented to a human user, who may be a decision-maker or a data-analyst. The user is confronted with the task of selecting the pieces of knowledge that are of the highest quality or interest according to his or her preferences. Since this selection is sometimes a daunting task, designing quality and interestingness measures has become an important challenge for data mining researchers in the last decade. This volume presents the state of the art concerning quality and interestingness measures for data mining. The book summarizes recent developments and presents original research on this topic. The chapters include surveys, comparative studies of existing measures, proposals of new measures, simulations, and case studies. Both theoretical and applied chapters are included. Papers for this book were selected and reviewed for correctness and completeness by an international review committee Front Matter....Pages I-IX Introduction....Pages 1-11 Mechanic and Acoustic Oscillations....Pages 13-25 Electromechanic and Electroacoustic Analogies....Pages 27-35 Electromechanic and Electroacoustic Transduction....Pages 37-53 Magnetic-Field Transducers....Pages 55-69 Electric-Field Transducers....Pages 71-86 The Wave Equation in Fluids....Pages 87-101 Horns and Stepped Ducts....Pages 103-115 Spherical Sound Sources and Line Arrays....Pages 117-131 Piston Membranes, Diffraction and Scattering....Pages 133-144 Dissipation, Reflection, Refraction, and Absorption....Pages 145-160 Geometric Acoustics and Diffuse Sound Fields....Pages 161-176 Isolation of Air- and Structure-Borne Sound....Pages 177-193 Noise Control – A Survey....Pages 195-209 Appendices....Pages 211-218 Back Matter....Pages 219-233 Blauert's and Xiang's Acoustics for Engineers provides the material for an introductory course in engineering acoustics for students with basic knowledge in mathematics. In the second, enlarged edition, the teaching aspects of the book have been substantially improved. Carefully selected examples illustrate the application of acoustic principles and problems are provided for training. Acoustics for Engineers is designed for extensive teaching at the university level. Under the guidance of an academic teacher it is sufficient as the sole textbook for the subject. Each chapter deals with a well defined topic and represents the material for a two-hour lecture. The 15 chapters alternate between more theoretical and more application-oriented concepts "This textbook provides the material for an introductory course or self-study in Engineering Acoustics. It is based on extensive teaching experience at the university level. Although originally compiled for engineering students, the material is suitable for all readers with basic knowledge in mathematics."--Jacket This book presents recent advances in quality measures in data mining.