Download Sound Control in Buildings A Guide to of the Building by M. W. Simons PDF

By M. W. Simons

This consultant offers recommendation on assembly the factors prescribed within the schooling (School Premises) laws 1996. It replaces layout be aware 17. the information are geared toward the designers of recent tuition structures yet can also be used for the advance of present constructions.

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Additional resources for Sound Control in Buildings A Guide to of the Building Regulations

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42 Sound Control in Buildings The usual value for the reference absorption is again A0 a 10 m2. The alternative is: LHnT where LHnT Lrec T T0 is is is is  ˆ Lrec À 10 log10 T T0  dB the standardised impact sound pressure level, field measurement the measured sound pressure level the reverberation time of the receiving room a reference reverberation time. 5 s. 2 Conversion of impact sound indices to single number quantities As with airborne sound insulation, the above impact sound insulation properties are normally measured in third octave bands over the range 100Hz to 3150Hz, giving 16 separate values of Ln, (or LHn or LHn T), one for each third octave band.

Flanking transmission via paths through adjoining components . The quality of workmanship in the construction of the panel and all its associated structure. For single panels, the general rule, derived from the mass law, is that an increase in the mass per unit area of the panel will increase its sound reduction index. This, however, is subject to the effects of panel resonances and the coincidence effect. For panels of two or more layers the mass per unit area is still important, but the main principle is to minimise or even eliminate mechanical connection between at least one pair of layers.

However, as can be seen from Fig. 3, the greater the degree of damping the lower the effectiveness of vibration isolation at high frequency. Again, a compromise must be struck between competing requirements. 6 Reducing impact sound transmission ± implications for building design The intensity of the vibrational energy is greatest close to the point of impact, and so control measures are most effective when placed here. In the case of impacts on the floor of a building, an impact can occur anywhere over the floor area, and the whole floor surface is therefore a potential point of impact.

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