Building Acoustics

280 Building acoustics type (see Figure 8.3). These calculations are performed using a transfer matrix model described in Chapte ...

Multilayer elements 281 (^0) 12 1 , 2 s s f π mm =+ (8.5) where m 1 and m 2 are the mass per unit area of the two leaves and whe ...

282 Building acoustics In our example (see Figure 8.3), we get f 0 ≈ 140 Hz when using this expression. It should be noted that ...

Multilayer elements 283 from a theoretical point of view, then becomes of less interest in practice. Furthermore, judging from F ...

284 Building acoustics treating the case of a double leaf lightweight partition with periodically placed studs. We shall postpon ...

Multilayer elements 285 uniformly distributed elastic springs as well as a more accurate model taking the discrete placing of th ...

286 Building acoustics We shall treat all these methods of couplings starting with a double construction of a special type: a he ...

Multilayer elements 287 wall area S we may just multiply by n to arrive at the total radiated power. We have assumed that the ra ...

288 Building acoustics 32 00 0 point 32 c 22 00 0 line c 8 , 2 , cu W f cu W f U π U π =⋅ =⋅   A (8.17) where u 0 is velocity ...

Multilayer elements 289 0.1 0.2 0.3 0.5 1 2 3 5 Distance between studs (m) 0 5 10 15 20 'R max (dB) 1 2 3 5 10 Figure 8.10 Acous ...

290 Building acoustics The effect of such a lining of 12 mm chipboard attached to a lightweight brick wall of 87 mm thickness in ...

Multilayer elements 291 shown in Figure 8.6 we shall have to include either a coupling element or a subsystem between the subsys ...

292 Building acoustics There is certainly a need for performing simple estimations of the sound reduction index of double constr ...

Multilayer elements 293 The radiation factor VB of each of the n bridges is given by Equation (8.18). As distinct from the case ...

294 Building acoustics As we are driving all these “beams” in parallel, we get line B line 0 c 2(1 j) or 2 (1 j). y y F F Z Lmc ...

Multilayer elements 295 wooden studs, CM is zero. However, common experience shows that steel studs may have quite different ela ...

296 Building acoustics undulating sound reduction curve but followed the general trend of the measured data, although the model ...

Multilayer elements 297 Figure 8.17 gives an example, which shows that the difference in the reduction index, using a single wal ...

298 Building acoustics the curve in the higher frequency range is probably due to flanking transmission, which even with laborat ...

Multilayer elements 299 this case we could apply modelling by transfer matrices but a more advanced one than the equivalent flui ...