Physical performance of sound insulation Sample Clauses

Physical performance of sound insulation. The sound insulation programme carried out by the DFAA aims to achieve the transmission loss, TL, of 20 dB for the residential homes in the area with WECPNL of 75 to 80 and TL of 25 dB for those in the area with WECPNL of over 80. The noise reduction measured as the difference of sound levels between inside and outside the residential homes which are sound insulated by the DFAA around Kadena Air Base may be considered to be about 30 dB on the basis of the measurements conducted in two ways. In one way of measurement, broadband noise is generated by a loud speaker set outside of a residential house and octave band levels are measured inside of the house. A record of measurement conducted for a most properly sound insulated house indicates the transmission loss is 30 to 50 dB. In another way of measurement was undertaken as on-the-spot inspection of a civil suit case where 906 plaintiffs demanded restriction of nighttime flights and compensation for the damages caused by aircraft noise from Kadena Air Base. In that case both sound levels inside and outside of residential houses are recorded and the difference of the two sound levels is calculated. The result tells the difference is 26 to 29 dB. The performance of sound insulation, however, is reported to be di- verse one home after another and one flight after another. It depends on many factors such as the construction skill, the structural strength and type of the building, the fight path relative to the home, the type of aircraft, etc.(Sharp; 1994) The results of the measurements around Osaka International Airport for over 1,000 homes show that the mean TL of the homes for the same type of aircraft and the flight path are basically constant over the years of measure- ments from 1975 to 1978 with standard deviations from 2.6 to 4.6 dB. The standard deviations of the measurements are considerable taking the fact that they are of the same types of aircraft flying the same courses of flight path into account (Xxxx; 1979). Thus it seems fairly difficult to determine by a simple figure of transmis- sion loss of the buildings the physical performance of sound insulation against aircraft noise.
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