Structure-Borne Sound: Structural Vibrations and Sound Radiation at Audio Frequencies

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Springer Science & Business Media, Dec 5, 2005 - Technology & Engineering - 608 pages
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Structure-Borne Sound" is a thorough introduction to structural vibrations with emphasis on audio frequencies and the associated radiation of sound. The book presents in-depth discussions of fundamental principles and basic problems, in order to enable the reader to understand and solve his own problems. It includes chapters dealing with measurement and generation of vibrations and sound, various types of structural wave motion, structural damping and its effects, impedances and vibration responses of the important types of structures, as well as with attenuation of vibrations, and sound radiation from structures. For the third edition, the author fundamentally revised and newly organized the contents of the work. Nevertheless, the intention has been to preserve the style of the previous editions, namely to focus on the fundamentals enabling the reader to analyse further problems.

 

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damping problems

Contents

585 Vibration Transmission from Machinery
325
References
337
Attenuation of StructureBorne Sound
340
611 Attenuation of Longitudinal Waves
341
612 Attenuation of Bending Waves
343
62 RightAngled Corners and Branches
347
622 Incident Longitudinal Wave
352
623 Right Angled Branches with Incident Bending and Longitudinal Waves
353

Survey of Wave Types and Characteristics
26
312 QuasiLongitudinal Waves on Beams and Plates
32
32 Transverse Waves
38
322 Torsional Waves
43
33 Bending Waves
48
332 Energy Relations
57
34 Wave Motions on Beams of Finite Length
59
341 Longitudinal Natural Vibrations
60
342 Natural Vibrations in Bending
66
35 The General Field Equations
73
36 Wave Field at a Free Surface
83
362 Excitation of an Elastic HalfSpace
92
363 Surface Waves
95
37 Free Plate Waves
98
372 Waves with Displacements only Parallel to the Surface
100
373 Waves with Displacements Perpendicular to the Surface
102
374 Equations of Motion for Thin Plates from the General Field Equations
108
38 Hamiltons Principle for the Derivation of the Equations of Motion
119
382 Flat Plate with Shear Stiffness The Corrected Bending Wave
120
383 Cylindrical Shells
125
39 StructureBorne Sound Intensity
139
392 Intensity in this Plates
140
393 Power Transmission in ThinWalled Cylindrical Shells
144
References
146
Damping
148
42 Complex Modulus and Wavenumbers
152
43 Resonant Vibrations of Damped Beams
160
431 QuasiLongitudinal Waves and Torsional Waves
161
432 Bending Waves
168
44 Measurement of Complex Moduli
172
441 Measurements on Small Samples
173
442 Measurements on Beams
182
443 Measurements on Other than BeamLike Samples
189
45 Experimental Data
190
452 Plastics
192
453 Building Materials
195
46 Plates with Attached Layers
196
462 Plates with MultiLayer Treatments
200
463 Equations of Motion of Layered Plates
207
47 Damping by means of Resonant Systems
216
471 Damping by Thick Layers Ballast
222
48 Damping at Joints
224
481 Damping by Relative Motion Normal to the Interface
225
482 Damping by Relative Motion Tangential to the Interface
229
References
231
Impedance and Mobility
235
52 Measurement of Mobilities Impedances
237
522 Comparison with Know Mobilities
239
523 Other Measurement Methods
241
53 Input Mobility of Infinite Rods Beams and Plates
243
532 Excitation of Bending Waves in Beams
244
533 Point Mobility of a Homogeneous Plate
250
54 Wave Impedance Wave Mobility
255
542 Examples
256
543 Relation between Wave Mobility and Point Mobility
259
544 Moment Mobilities
271
545 Calculation of Impulse Response
274
55 Power Transmission to Infinite Plane Structures
276
552 Relationship with the Point Mobility
279
553 Interpretations and Examples
282
56 Summary of Impedance and Mobility Formulae Approximations
285
57 PointExcitation of Finite Systems
288
571 General Properties
289
572 Some Applications
293
573 Power Considerations
297
58 Some Specific Applications
305
582 Excitation by Sudden Release of Potential Energy
316
583 Rough Surfaces as Sources of StructureBorne Sound
318
584 Parametric Excitation
321
63 Elastic Interlayers
358
631 Attenuation of Longitudinal Waves
359
632 Attenuation of Bending Waves
362
64 Blocking Masses
366
641 Attenuation of Longitudinal Waves
367
643 Attenuation of Bending Waves Eccentric Blocking Masses
372
65 Periodic Structures
375
652 Attenuation of Longitudinal Waves
379
653 Periodic Bending WaveGuide
384
66 Hamiltons Principle for Transmission Problems
391
662 An Introductory Example
393
663 Bending and Longitudinal Waves at an Eccentric Blocking Mass
396
67 Oblique Incidence
401
672 General Consequences of the Boundary Conditions
404
673 Examples
408
674 Application of Hamiltons Principle
419
68 Parallel Plates
421
682 PointLike Sound Bridges
426
69 Statistical Energy Analysis SEA
429
692 Energy Flow between Linearly Coupled Oscillators
433
693 Estimation of Coupling Loss Factors
436
694 Application
443
References
446
Sound Radiation from Structures
448
72 Definition and Measurement of Radiation Efficiency
450
73 Radiation Loss Factor
452
74 Elementary Radiators
454
742 Dipole Radiators and Radiation from Forces
457
743 Infinite Plates
460
744 Cylindrical Radiators
464
745 Impulsive Sources
468
75 Plane Baffled Radiators
471
751 The Plane Radiator as a Sum of Point Sources
472
752 Plane Radiators as Sum of Plane Waves
478
76 Radiation from Bending Waves
482
763 Modal Radiation
488
764 Radiation from Externally Excited Bending Waves
491
765 Comparison with Experiments
496
766 Additional Remarks on StructureBorne Sound Radiation
500
77 FluidBorne Sound Excitation of Structures
507
772 Double Walls with Sound Bridges
511
78 Relation between Radiation and Response
514
782 Response and Radiation in a Reverberant Room
515
783 Directivity by Excitation and Radiation
518
784 Sound Transmission above the Critical Frequency
519
785 Transmission Loss in the Vicinity of the Critical Frequency
523
79 Application of Statistical Energy Analysis
524
792 Double Walls
527
793 MultiLayered Walls with Several Rigid Connections
530
References
532
Generation and Measurement of Structure Borne Sound
535
812 Comparison with Known Mobilities
537
813 Mechanical Transducers as Damped MassSpring Systems
540
814 Interaction of Transducer and Measurement Object
544
815 Immobile Reference and Rigid Termination
551
82 Controllable Sensors
552
822 Optical Sensors
557
83 Excitation and Measurement of StructureBorne Sound
559
831 ElectroDynamic Transducers
560
832 PiezoElectric Transducers
570
833 ElectroStatic Transducers
577
834 ElectroMagnetic Transducers
582
835 Magnetostrictive Transducers
584
836 Elaboration on Reciprocal Transducers
585
84 Combined Quantities
588
References
590
List of Symbols and Notation
592
Index
597
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