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Showing papers in "Applied Acoustics in 1971"


Journal ArticleDOI
TL;DR: In this article, a simple analytic expression is proposed for the calculation of the excess attenuation due to diffraction around a barrier of sound rays emanating from a point source; this analysis takes into account oblique sound incidence at the barrier and also includes the transition region from the bright zone to the shadow zone behind the barrier.

164 citations


Journal ArticleDOI
TL;DR: It is proposed that interim standards for dwellings should be set in terms of the level at the facade exceeded for 10 per cent of the time between the hours of 6 a.m. and 12 midnight.

43 citations


Journal ArticleDOI
TL;DR: In this paper, acoustic wedges of polyurethane ether foam have been designed with a cut-off frequency between 50 and 60 Hz steel tubes have been inserted as spines in the wedges, and the tips have been removed to allow greater working space in the chamber.

13 citations


Journal ArticleDOI
TL;DR: In this article, a 1:8 scale model of a seated person dressed in light to medium weight clothing was developed to simulate a typically dressed Sydney audience and the influence of clothing on sound absorption was found to be significant.

10 citations


Journal ArticleDOI
TL;DR: In this paper, the authors present a survey of the theory and practice of the measurement of the sound insulation of glass, and the effects of changes in the various parameters will be discussed.

9 citations


Journal ArticleDOI
TL;DR: In this paper, the sound absorption of an audience on unupholstered seating as determined by acoustic scale model techniques was reported, and the model auditor used was developed to simulate a seated person dressed in light to medium weight clothing.

8 citations


Journal ArticleDOI
TL;DR: In this paper, a series of measurements of the sound transmission loss of double layer plasterboard panels were carried out with the panels separated by 50, 100, and 150 mm, and measurements were also made with no sound absorbing infill for comparison purposes.

8 citations


Journal ArticleDOI
TL;DR: In this paper, a general introduction into possible ways in which the sound insulation of facades could be measured is given. Examined are direction of measurement, noise source, sound pressure levels measurements and calculation of sound insulation.

7 citations


Journal ArticleDOI
TL;DR: The author concludes that the effects of isolating the panes of a double window and the design of openable double windows need to be examined in more detail and agreement as to which is the most appropriate method, diffuse or directional sound fields, for measuring the insulation of windows and other facade elements needs to be reached.

6 citations


Journal ArticleDOI
TL;DR: In this paper, the sources of noise in domestic, aerated, natural gas burners are located and discussed and techniques for reducing the noise level are developed and their practical application described.

5 citations


Journal ArticleDOI
TL;DR: A critical evaluation of the state of the art relating to the measurement and characterisation of the acoustic performance of fluid system components, in particular of pumps and acoustic filters for liquid piping systems leads to the conclusion that the difficulties therein have only begun to be recognised, and are far from solved.

Journal ArticleDOI
TL;DR: A critical evaluation of the state of the art relating to the measurement and characterisation of the acoustic performance of fluid system components, in particular of pumps and acoustic filters for liquid piping systems, is presented in this paper.

Journal ArticleDOI
TL;DR: In this paper, the problem of obtaining enough sound insulation by sealing such leaks as bolt holes in thick walls has been studied in two steps and the results from the first step are intended to give a general view of the problems.

Journal ArticleDOI
TL;DR: In this paper, published results of sound insulation measurements are discussed in relation to the effects of the various factors, and the tabulated data supporting this discussion will constitute the final part.


Journal ArticleDOI
TL;DR: In this article, the use of rechargeable, nickel-cadmium batteries instead of the throw-away type is suggested for sound level meters, and a simple method for recharging the batteries is discussed.

Journal ArticleDOI
TL;DR: In this paper, test codes for the measurement of the noise from portable compressors, rock drills and paving breakers are discussed, and noise criteria for construction works with respect to annoyance are annotated.