Building Acoustics

320 Building acoustics calculate the time function of the force F and thereafter compare this with the corresponding force witho ...

Multilayer elements 321 has the same stiffness as used in Figure 8.36, and the improvements are calculated using these two pulse ...

322 Building acoustics Acoustics, LTH, Sweden. [Also published in Acta Acustica/Acustica, 89 (2003), 309–322.] Brunskog, J. and ...

Multilayer elements 323 Vigran, T. E., Kelders, L., Lauriks, W., Dhainaut, M. and Johansen, T. F. (1997) Forced response of a sa ...

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CHAPTER 9 Sound transmission in buildings. Flanking sound transmission 9.1 INTRODUCTION With some exceptions, we have up to now ...

326 Building acoustics transmission via a suspended ceiling common to two neighbouring rooms, i.e. the partition wall does not s ...

Sound transmission in buildings. Flanking transmission. 327 1 10 100 Area ratio S 0 /S 1 0 5 10 15 20 R - 0 R tot ( dB) 18 15 12 ...

328 Building acoustics thickness 100 mm is shown in Figure 9.2, illustrating the general frequency dependence of the transmissio ...

Sound transmission in buildings. Flanking transmission. 329 τdiffuse=πτ(0). (9.5) This implies that the sound reduction index fo ...

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330 Building acoustics Mechel’s Equation (9.4), which gives nearly identical results as predicted by Wilson and Soroka (1965). U ...

Sound transmission in buildings. Flanking transmission. 331 problem of sound incidence, two other deviations from the assumption ...

332 Building acoustics 9.2.2 Sound transmission involving duct systems Another example where we may assume that the sound transm ...

Sound transmission in buildings. Flanking transmission. 333 the ratio of the radiated sound power from the terminal in the recei ...

334 Building acoustics The sound pressure p is the pressure in the assumed reverberant field outside the duct, and W is the powe ...

Sound transmission in buildings. Flanking transmission. 335 the duct and the structural wave field in the duct walls. It should ...

336 Building acoustics addition, one will always get high radiation at frequencies around the so-called ring frequency fR, the f ...

Sound transmission in buildings. Flanking transmission. 337 section). We shall, as above, not reproduce Mechel’s theory, just pr ...

338 Building acoustics plasterboard and there is no absorber in the plenum. The height h of the plenum is 0.43 metre. In additio ...