Index
- a
- absorber, 302
- absorber
- perforate, 305
- absorption area, 167, 184
- acoustic insulation, 364
- acoustic isolation, 314
- aerospace liner, 307
- aircraft, 361
- aliasing, 420
- angular frequency, 2
- auto spectral density, 32
- average
- c
- cavity, 128
- coincidence frequency, 246
- conductance, 190
- convolution, 35, 417
- convolution
- two-dimensional, 70
- convolution integral, 35
- coordinates
- correlation coefficient
- normalised, 31
- coupling loss factor, 194
- coupling loss factor
- critical viscous damping, 2
- cross correlation, 31
- cross spectral density, 33
- cylindrical shells, 406
- d
- damper, 1
- damping
- damping loss
- field, 166
- damping loss factor, 14
- damping matrix, 20
- decay rate, 5
- decay time, 5
- decibel, 72
- degrees of freedom, 202
- degrees of freedom
- delta comb, 419
- delta function, 36, 414
- diffuse field reciprocity, 207
- diffuse wave field, 160
- diffuse wave field
- dilation, 79
- discrete coordinates, 202
- double wall, 308
- double wall
- aircraft, 364
- double wall resonance, 311, 313
- dynamic energy analysis, 406
- dynamic stiffness, 9
- dynamic stiffness matrix, 20, 145
- dynamically complex, 159
- e
- energy, 7
- energy
- energy density, 52
- energy flow method, 404
- energy influence coefficient, 404
- engineering unit, 197
- equation of state, 45
- ergodic, 32, 159
- expected value, 29
- extruded hollow profiles, 381
- f
- Fast Fourier transform, 422
- finite element
- finite element method
- acoustic, 140
- fluid structure coupling, 204
- force density, 45
- Fourier analysis, 411
- Fourier coefficients, 411
- Fourier Series, 411
- Fourier transform
- Fourier Transformation, 413
- frame, 365
- free field radiation stiffness, 205
- frequency limit
- upper, SEA, 172
- frequency response, 17, 20, 37
- frequency response
- modal, 26
- fuselage, 365
- g
- Gauss’s theorem, 131
- glass fiber blankets, 364
- Green’s function
- Green’s function, 63
- group velocity, 116
- h
- Hankel function, 69
- Hankel function of second kind, 111
- heat capacity
- specific, 46
- Helmholtz equation, 50
- Helmholtz number, 198
- hybrid method
- work flow, 218
- i
- ideal gas law, 45
- impedance, 9
- impedance
- mechanical, 9
- impedance matrix, 272
- insertion loss, 73
- insertion loss coefficient, 334
- intensity
- sound, 50
- k
- Kirchhoff-Helmholtz integral, 65
- m
- Mach number, 361
- mass matrix, 20
- mass matrix
- acoustic, 141
- material
- material laws, 81
- micro-perforate absorber, 306
- mobility, 9
- modal analysis
- experimental, 401
- modal assurance criteria, 402
- modal density, 125, 197
- modal frequency response
- mode count, 126
- mode shape, 24
- mode shape
- plate, bending, 152
- model overlap, 170
- model updating, 402
- modes
- moment
- plate, 107
- Monte Carlo method, 174
- p
- Parseval’s formula, 416
- perforated sheet, 279
- pipe, 119
- pipe
- acoustic, 275
- piston, 66
- plate, 101, 151
- point source, 58
- Poisson ratio, 76, 82
- polar moment of area, 425
- porous
- pressure level, 72
- probability, 28
- probability density, 27
- process
- stationary, ergodic, 32
- proportional damping matrix, 20
- q
- quality factor, 11
- r
- radiation
- radiation efficiency, 71
- radiation stiffness
- radius of gyration, 96
- random process, 27
- ray tracing, 172
- Rayleigh integral, 65, 66
- reactance, 9
- receptance
- mechanical, 9
- reciprocity
- reduced mass, 315
- reflection
- reflection coefficient, 60
- reflection factor, 60
- resistance, 9
- response function, 9
- reverberant field, 160
- rigid frame model, 299
- rod, 146
- room, 128
- s
- sandwich plates, 405
- SEA
- fluid analogy, 196
- SEA matrix, 194
- SEA matrix
- second moment of area, 425
- semi infinite fluid, 337
- shear modulus, 77
- signal power, 416
- Snell’s law, 61
- solid angle, 161
- sound transmission, 248
- sound transmission
- source strength
- harmonic, 55
- sources
- spectral leakage, 422
- speed of sound, 46
- spherical source
- acoustic, 53
- spring, 1
- stiffness matrix, 20
- stiffness matrix
- acoustic, 141
- strain, 76
- strain
- strain tensor, 79
- stress, 76
- stress
- stringer, 365
- susceptance, 190
- system, 34
- system
- dynamically complex, 159
- t
- third-octave band, 319
- time average, 8
- train, 380
- transfer matrix, 271
- transfer matrix
- transfer path analysis, 400
- transmission
- plane acoustic waves, 60
- transmission coefficient, 62, 224
- transmission coefficient
- relation to coupling loss factor, 224
- transmission loss, 73
- tube, 119
- turbofan, 361
- turbulent boundary layer, 362
- u
- uncertainty, 159
- w
- wave
- wave equation
- wave finite element method, 406
- wavelength, 49
- wavenumber, 49
- wavenumber
- komplex, 53
- window function, 423
- window function
- y
- Young’s modulus, 76
- z
- zero-padding, 423
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