Item Details

Active Noise Control: Fundamentals for Acoustic Design

G. Rosenhouse
Format
Book
Published
Southampton, Boston: WIT Press, c2001.
Language
English
ISBN
1853123730
Contents
  • 1. Essence of active noise and vibration cancellation (ANVC) and its trends Motto, motivation and background 1
  • 1.2 Control algorithms 17
  • 1.3 Development of ANVC from notional models to practical devices 19
  • 1.4 Improvement of ANVC, based on advances in electronics, control and electroacoustics 21
  • 1.5 Acoustic field, the electroacoustic paths and the ANC design 27
  • 1.6 Summary and assessment of trends 30
  • 2. Sources of sound, linear and non-linear sound fields, radiation from surfaces, electroacoustics and active noise control 43
  • 2.1.1 Sound field reshaping by additional sources 45
  • 2.1.2 Theory of complexity and active noise control 45
  • 2.2 Acoustic wave equation 49
  • 2.2.2 Linear acoustics 50
  • 2.2.3 Non-linear acoustics 55
  • 2.3 Sound sources 53
  • 2.3.2 Simple sources 55
  • 2.3.3 Use of superposition of sound sources in solving sound radiation problems 77
  • 2.3.4 Moving and accelerating sound sources 80
  • 2.3.5 Radiation of sound from vibrating surfaces 101
  • 2.3.6 Radiation of sound from vibrating pistons 102
  • 2.3.7 Non-linear and thermal sources 106
  • 2.4 Contribution of audio electroacoustics to the development of active noise and vibration control 112
  • 2.4.2 Classification of the electroacoustic units 112
  • 2.4.3 Use of delay units and artificial reverberation in room electroacoustics 114
  • 2.4.4 Obstacles in functioning of electroacoustics, instabilities, howlback and their elimination 122
  • 2.4.5 From stereo technique to modern loudspeaker surround techniques 125
  • 2.5 Natural sources of sound 131
  • 2.5.1 Natural sources 131
  • 2.5.2 Power, intensity and directivity of sound sources and receivers 143
  • 2.5.3 Creation of equivalent sound sources and their active control 148
  • 2.6 Sound radiation from vibrating plates 159
  • 2.6.1 Radiation efficiency 159
  • 2.6.2 State-of-the-art of active control of plates, curved surfaces, shells and frames 174
  • 2.6.3 Effects of joints, stiffeners and other obstacles 190
  • 2.7 A superposition of sound fields of sources in active noise control 194
  • 2.7.1 Acoustic steady state fields 194
  • 2.7.2 Acoustic transients 204
  • 2.8 Active suppression of noise radiated from thermal and non-linear sources 209
  • 2.8.1 Active control of thermo-acoustic sources 209
  • 2.8.2 Absorption and scattering of sound by sound (non-linear waves and vorticities) 214
  • 2.9.2 Sound sources, field equations and linear superposition 225
  • 2.9.3 Algorithms 226
  • 2.9.4 Audio sources, receivers and systems 226
  • 2.9.5 Environmental acoustics and ANC 226
  • 2.9.6 Vibrating surfaces as sound radiators 226
  • 2.9.7 Active noise control of non-linear fields and the effect of special physical effects 227
  • 3. A superposition of sound fields in the vicinity of impedance and active surfaces, and semi-active control of sound and vibration 255
  • 3.1.1 Sound field reshaping in presence of obstacles 257
  • 3.1.2 Semi-active control of sound and vibration 258
  • 3.1.3 Expansion of sound radiation from an omni-directional source into plane waves 259
  • 3.2 Sound absorption by layers of materials 260
  • 3.3 Reflecting surfaces 263
  • 3.3.1 Locally reacting surface 263
  • 3.3.2 Surface of extended reaction 265
  • 3.3.3 Other models and mechanisms of sound absorption and scattering by surfaces 266
  • 3.3.4 Non-reflecting boundaries 277
  • 3.4 Point source over an impedance plane surface 281
  • 3.4.1 Image sources 281
  • 3.4.2 Sound field determination by geometrical acoustics 281
  • 3.4.3 Exact integral solution 283
  • 3.4.4 Comparisons between the solution based on geometrical acoustics and the exact solutions 286
  • 3.5 Superposition of sound fields in active noise control in the vicinity of rigid and impedance surfaces 294
  • 3.5.1 Cancelation of sound field created by a source above ano impedance boundary 294
  • 3.5.2 Cancelation of sound field created by sources close to two adjacent impedance boundaries 301
  • 3.6 Acoustic effect of obstacles and the effect of non-homogeneous media 309
  • 3.6.1 Sound field scattered by a cylindrical obstacle 309
  • 3.6.1.1 A single rigid obstacle 309
  • 3.6.1.2 Scattering through an array of cylinders and oblate spheroids 316
  • 3.6.1.3 Sound scattering by elastic sound absorbing and roughly coated spheres and cylinders 327
  • 3.6.1.4 Sound source in the vicinity of several surfaces 329
  • 3.6.2 Special cases of activation by sound 330
  • 3.6.3 Sources in non-homogeneous media (and also sound propagation in the atmosphere and ANC) 335
  • 3.6.4 Active noise control in the vicinity of obstacles 340
  • 3.7 Sound field of a moving source near impedance surfaces 342
  • 3.7.1 A simplified approach to ANC of moving sources 345
  • 3.8 Walls of active absorption lining and active transmission loss 346
  • 3.9 Examples of semi-active adaptive control 349
  • 3.9.1 Semi-active control of friction dampers at junctions 349
  • 3.9.2 Semi-active control of friction dampers of suspension units 349
  • 3.9.3 Active magnetic bearings 350
  • 3.9.4 A new semi-active adaptive cells silencer 350
  • 3.9.5 Semi-active control for varying room acoustics 354
  • 3.10 Active noise control of outdoor noise 355
  • Appendix A Mathematical definitions and expansions 379
  • Appendix B Thomasson's layer point admittance 383
  • Appendix C Attenborough's typical impedance values for ground 384
  • Appendix D On the approximation of mechanical systems by models combined of discrete units 385
  • Appendix E Background about tinnitus and its relation to ANC 386
  • Appendix F Background about tinnitus treatment by electric stimulation (ES) and its relation to ANC 393
  • Appendix G Background about otoacoustic emission, tinnitus and their relation to ANC 397.
Description
v. : ill. ; 25 cm.
Notes
Includes bibliographical references and indexes.
Technical Details
  • Access in Virgo Classic

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    g| 1. t| Essence of active noise and vibration cancellation (ANVC) and its trends Motto, motivation and background g| 1 -- g| 1.2 t| Control algorithms g| 17 -- g| 1.3 t| Development of ANVC from notional models to practical devices g| 19 -- g| 1.4 t| Improvement of ANVC, based on advances in electronics, control and electroacoustics g| 21 -- g| 1.5 t| Acoustic field, the electroacoustic paths and the ANC design g| 27 -- g| 1.6 t| Summary and assessment of trends g| 30 -- g| 2. t| Sources of sound, linear and non-linear sound fields, radiation from surfaces, electroacoustics and active noise control g| 43 -- g| 2.1.1 t| Sound field reshaping by additional sources g| 45 -- g| 2.1.2 t| Theory of complexity and active noise control g| 45 -- g| 2.2 t| Acoustic wave equation g| 49 -- g| 2.2.2 t| Linear acoustics g| 50 -- g| 2.2.3 t| Non-linear acoustics g| 55 -- g| 2.3 t| Sound sources g| 53 -- g| 2.3.2 t| Simple sources g| 55 -- g| 2.3.3 t| Use of superposition of sound sources in solving sound radiation problems g| 77 -- g| 2.3.4 t| Moving and accelerating sound sources g| 80 -- g| 2.3.5 t| Radiation of sound from vibrating surfaces g| 101 -- g| 2.3.6 t| Radiation of sound from vibrating pistons g| 102 -- g| 2.3.7 t| Non-linear and thermal sources g| 106 -- g| 2.4 t| Contribution of audio electroacoustics to the development of active noise and vibration control g| 112 -- g| 2.4.2 t| Classification of the electroacoustic units g| 112 -- g| 2.4.3 t| Use of delay units and artificial reverberation in room electroacoustics g| 114 -- g| 2.4.4 t| Obstacles in functioning of electroacoustics, instabilities, howlback and their elimination g| 122 -- g| 2.4.5 t| From stereo technique to modern loudspeaker surround techniques g| 125 -- g| 2.5 t| Natural sources of sound g| 131 -- g| 2.5.1 t| Natural sources g| 131 -- g| 2.5.2 t| Power, intensity and directivity of sound sources and receivers g| 143 -- g| 2.5.3 t| Creation of equivalent sound sources and their active control g| 148 -- g| 2.6 t| Sound radiation from vibrating plates g| 159 -- g| 2.6.1 t| Radiation efficiency g| 159 -- g| 2.6.2 t| State-of-the-art of active control of plates, curved surfaces, shells and frames g| 174 -- g| 2.6.3 t| Effects of joints, stiffeners and other obstacles g| 190 -- g| 2.7 t| A superposition of sound fields of sources in active noise control g| 194 -- g| 2.7.1 t| Acoustic steady state fields g| 194 -- g| 2.7.2 t| Acoustic transients g| 204 -- g| 2.8 t| Active suppression of noise radiated from thermal and non-linear sources g| 209 -- g| 2.8.1 t| Active control of thermo-acoustic sources g| 209 -- g| 2.8.2 t| Absorption and scattering of sound by sound (non-linear waves and vorticities) g| 214 -- g| 2.9.2 t| Sound sources, field equations and linear superposition g| 225 -- g| 2.9.3 t| Algorithms g| 226 -- g| 2.9.4 t| Audio sources, receivers and systems g| 226 -- g| 2.9.5 t| Environmental acoustics and ANC g| 226 -- g| 2.9.6 t| Vibrating surfaces as sound radiators g| 226 -- g| 2.9.7 t| Active noise control of non-linear fields and the effect of special physical effects g| 227 -- g| 3. t| A superposition of sound fields in the vicinity of impedance and active surfaces, and semi-active control of sound and vibration g| 255 -- g| 3.1.1 t| Sound field reshaping in presence of obstacles g| 257 -- g| 3.1.2 t| Semi-active control of sound and vibration g| 258 -- g| 3.1.3 t| Expansion of sound radiation from an omni-directional source into plane waves g| 259 -- g| 3.2 t| Sound absorption by layers of materials g| 260 -- g| 3.3 t| Reflecting surfaces g| 263 -- g| 3.3.1 t| Locally reacting surface g| 263 -- g| 3.3.2 t| Surface of extended reaction g| 265 -- g| 3.3.3 t| Other models and mechanisms of sound absorption and scattering by surfaces g| 266 -- g| 3.3.4 t| Non-reflecting boundaries g| 277 -- g| 3.4 t| Point source over an impedance plane surface g| 281 -- g| 3.4.1 t| Image sources g| 281 -- g| 3.4.2 t| Sound field determination by geometrical acoustics g| 281 -- g| 3.4.3 t| Exact integral solution g| 283 -- g| 3.4.4 t| Comparisons between the solution based on geometrical acoustics and the exact solutions g| 286 -- g| 3.5 t| Superposition of sound fields in active noise control in the vicinity of rigid and impedance surfaces g| 294 -- g| 3.5.1 t| Cancelation of sound field created by a source above ano impedance boundary g| 294 -- g| 3.5.2 t| Cancelation of sound field created by sources close to two adjacent impedance boundaries g| 301 -- g| 3.6 t| Acoustic effect of obstacles and the effect of non-homogeneous media g| 309 -- g| 3.6.1 t| Sound field scattered by a cylindrical obstacle g| 309 -- g| 3.6.1.1 t| A single rigid obstacle g| 309 -- g| 3.6.1.2 t| Scattering through an array of cylinders and oblate spheroids g| 316 -- g| 3.6.1.3 t| Sound scattering by elastic sound absorbing and roughly coated spheres and cylinders g| 327 -- g| 3.6.1.4 t| Sound source in the vicinity of several surfaces g| 329 -- g| 3.6.2 t| Special cases of activation by sound g| 330 -- g| 3.6.3 t| Sources in non-homogeneous media (and also sound propagation in the atmosphere and ANC) g| 335 -- g| 3.6.4 t| Active noise control in the vicinity of obstacles g| 340 -- g| 3.7 t| Sound field of a moving source near impedance surfaces g| 342 -- g| 3.7.1 t| A simplified approach to ANC of moving sources g| 345 -- g| 3.8 t| Walls of active absorption lining and active transmission loss g| 346 -- g| 3.9 t| Examples of semi-active adaptive control g| 349 -- g| 3.9.1 t| Semi-active control of friction dampers at junctions g| 349 -- g| 3.9.2 t| Semi-active control of friction dampers of suspension units g| 349 -- g| 3.9.3 t| Active magnetic bearings g| 350 -- g| 3.9.4 t| A new semi-active adaptive cells silencer g| 350 -- g| 3.9.5 t| Semi-active control for varying room acoustics g| 354 -- g| 3.10 t| Active noise control of outdoor noise g| 355 -- g| Appendix A t| Mathematical definitions and expansions g| 379 -- g| Appendix B t| Thomasson's layer point admittance g| 383 -- g| Appendix C t| Attenborough's typical impedance values for ground g| 384 -- g| Appendix D t| On the approximation of mechanical systems by models combined of discrete units g| 385 -- g| Appendix E t| Background about tinnitus and its relation to ANC g| 386 -- g| Appendix F t| Background about tinnitus treatment by electric stimulation (ES) and its relation to ANC g| 393 -- g| Appendix G t| Background about otoacoustic emission, tinnitus and their relation to ANC g| 397.
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