Building Acoustics

200 Building acoustics determination of the characteristic viscous and thermal lengths. A procedure to do this is to plot the qu ...

Sound absorbers 201 sair air air sHe He He (^0) i and where i. k b L k b L υ π υ μ υ πρ = ⎛⎞ ==⎜⎟ ⎝⎠ (5.74) How this linear appr ...

202 Building acoustics Another procedure is by way of analytical modelling using transfer matrices. Basically, each layer in the ...

Sound absorbers 203 (^2) g000 g000 cos 1and ppcos Z c RR Z c φ ρ α φρ − =− = + (5.77) The angle φ 0 denotes the direction of pla ...

204 Building acoustics ( jj jj c () 1 and ( ). kx kx kx kx px Ae B e vx Ae B e Z − − =⋅ +⋅ =⋅−⋅) (5.78) The quantities A and B w ...

Sound absorbers 205 () ( ) () () c 12 12 c sinh cos cosh cos cos sinh cos cos cosh cos Zd d pp vvd d Z φ φ φ φ φφ ⎡⎤Γ⋅ ⎢⎥Γ⋅ ⎡⎤⎢⎥ ...

206 Building acoustics Dutilleux, G., Vigran, T. E. and Kristiansen, U. R. (2001) An in situ transfer function technique for the ...

CHAPTER 6 Sound transmission. Characterization and properties of single walls and floors 6.1 INTRODUCTION In the preceding chapt ...

208 Building acoustics radiating properties, i.e. the efficiency of the floor to radiate sound. One may consider this process as ...

Sound transmission 209 i t 1 10 lg 10 lg (dB). W R τ W ⎛⎞ ⎛⎞ =⋅ =⋅⎜⎟ ⎜⎟ ⎝⎠ ⎝⎠ (6.2) In the literature one often finds the term t ...

210 Building acoustics S SR RR R 1 10 lg 20 lg 10 lg 10 lg , p SS RLL τ pA A ⎛⎞ ⎛⎞ =⋅ = ⋅⎜⎟ ⎜⎟+⋅ = − +⋅ ⎝⎠ ⎝⎠   (6.6) where D ...

Sound transmission 211 Figure 6.3 Measurement of sound insulation in a building. Examples of transmission paths between rooms. I ...

212 Building acoustics to 5000 Hz. The procedure to substitute these data by a single number is based on the use of a reference ...

Sound transmission 213 To a certain extent, the “8 dB rule” is compensated for by the introduction of the so- called spectral ad ...

214 Building acoustics The quantity ΔAj in the last equation is the A-weighting factor^1 for the frequency band having centre fr ...

Sound transmission 215 for the sound reduction index of the actual façade element. Tabled data for Lj covers not only the usual ...

216 Building acoustics Figure 6.6 Measurement of impact sound pressure level caused by the standard tapping machine. The laborat ...

Sound transmission 217 the standard demands that the measured data should be given to one decimal place but that is not used in ...

218 Building acoustics 6.3 Sound radiation from building elements The sound insulation offered by a building element or a comple ...

Sound transmission 219 6.3.1.1 Examples using idealized sources We shall start using the idealized type of sources, monopoles an ...