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Parameter Study on a Composite sound-absorbing Structure liner in Elevator Shafts

Journal of Renewable Materials 2023年第9期11卷 3433-3446页

作者： Ting Qu Bo Wang Hequn Min Key Laboratory of Urban and Architectural Heritage Conservation of Ministry of Education School of ArchitectureSoutheast UniversityNanjing210096China

With the growing global environmental awareness,the development of renewable and green materials has gained increased worldwide interest to substitute conventional materials and are favorable for sustainable economic *** paper proposed a novel eco-friendly sound absorbing structure(NSAS)liner for noise reduction in elevator *** base layer integrated with the shaft walls is a damping gypsum mortarboard,and a rock wool board and a perforated cement mortarboard are used to compose the *** on the acoustic impedance theory of porous materials and perforated panels,the sound absorption theory of the NSAS was proposed;the parameter effects of the rock wool board(flow resistivity,porosity,structure factor)and perforated panel(perforated rates,thickness,density,perforated diameter)on NSAS absorption were discussed theoretically for absorption improvement,and experiments were also *** results showed that the perforation rate,the thickness of the perforated plate,and the porosity,flow resistance,and volume density of the rock wool board played a key issue in the absorption performances of the *** verified the accuracy of the proposed theoretical *** sound absorption performance of the NSAS at frequencies between 500–1600 Hz was achieved in both numerical analysis and experiments,and the sound absorption coefficient was improved to 0.72 around 1000 Hz after parameter *** NSAS proposed in this paper can also be made of other renewable materials with preferable structure strength and still has the potential to broaden the absorption *** can provide a reference for controlling the elevator shaft noise.

关键词： Elevator shafts sound-absorbing liner porous material ﬂow resistivity acoustic impedance

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