FINITE ELEMENT MODEL OF ABSORBENT FURNITUREIN SMALL ROOMS AT LOW FREQUENCIES

摘要

Sound transmission (below 100 Hz) into and between dwellings is anrnincreasing contribution to nuisance, due to a proliferation of hi- fi systems of highrnpower and enhanced bass response, mechanical services, and increasing traffic noisernbreak-in. A FE model has been developed to describe sound transmission betweenrnrooms at low frequencies, demonstrating the modal characteristics of pressure andrnvibration fields of the rooms and separating wall, respectively. The work hasrnidentified the need for an appropriate model of sound absorption in small-furnishedrnrooms at low frequencies. In this paper, a new FE model is used to describe thernrelationship between the sound absorption characteristics of the internal surfaces ofrnan enclosure, and its frequency response, for the frequency range 20 - 200 Hz. Thernnumerical model is validated by comparison with measurements for a smallrnreverberant chamber. Additionally, the effect of inserting absorbent furniture and ofrnfurniture location is investigated.