Building Acoustics

360 Subject index

Equivalent fluid, 82, 178
Ergodic, 12
Euler equation, 60
Excess attenuation, 59
Eyring’s formula, 121

Far field, 70
Fast Fourier transform (FFT), 16, 19
FFT analysis, 19
Finite element method, 53
Flanking transmission, 211, 229, 343
Flexural waves see Bending waves
Floating floor, 306
lightweight, 311
Floor covering, 318
Flow resistivity, 183, 317
Footfall noise see Impact sound
Fourier integral, 8
Fourier series, 4
Fourier transform, 4, 8, 320, 330
Fraunhofer diffraction, 140
Frequency
critical, 91
Frequency response function, 33
Fundamental frequency, 4

Gaussian noise, 25

Haas effect, 107
Hall radius see Room radius
Hammer apparatus see Tapping
machine
Hamming, 16
Hanning, 16
Helmholtz equation, 56
Helmholtz-Kirchhoff integral equation,
140
Honeycomb, 298
Hysteretic energy loss, 122
Hysteric damping, 41

Image-source model, 135
Impact sound pressure level, 215
Impact sound, 207
Impedance, 31
acoustic, 165
characteristic, 82, 190, 328

field, 188

mechanical, 165

point, infinite beam, 293

radiation, 328, 330

specific acoustic, 165

transmission, 75

wall, 75, 205, 242

Impulse response, 33

Junction

vibration reduction index, 343

Kaiser-Bessel, 16

Kundt’s tube see Standing wave tube

Laplace transform, 33

Lateral energy fraction, 109

Leakage, 16, 35

Locally reacting, 75

Logarithmic decrement, 41

Loss factor, 41, 100

coupling, 266, 351

Mass controlled, 43

Mass law, 242, 303

diffuse field, 246

Mean free path, 105, 143

Mean square value, 23

Mechanical impedance, 37

Mechanical mobility, 37

Mineral fibres, 156

MLS (maximum length sequences), 2,

28

Mobility, 31

input, 232

Modal analysis, 49, 53

Modal density, 98, 111

Modal energy, 266

Modal shapes, 52

Modal vectors, 49

Mode

axial, 110

corner, 225

dilatational, 303

edge, 225

oblique, 110

surface, 225