@Article{jrm.2023.027136,
AUTHOR = {Ting Qu, Bo Wang, Hequn Min},
TITLE = {Parameter Study on a Composite Sound-Absorbing Structure Liner in Elevator Shafts},
JOURNAL = {Journal of Renewable Materials},
VOLUME = {11},
YEAR = {2023},
NUMBER = {9},
PAGES = {3433--3446},
URL = {http://www.techscience.com/jrm/v11n9/53582},
ISSN = {2164-6341},
ABSTRACT = {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
development. This paper proposed a novel eco-friendly sound absorbing structure (NSAS) liner for noise reduction in elevator shafts. The 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 NSAS. Based 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 conducted. Numerical 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 NSAS. Experiments verified the accuracy of
the proposed theoretical model. Wideband 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 adjustments. The 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 bandwidth. It can provide a reference for controlling the elevator shaft noise.},
DOI = {10.32604/jrm.2023.027136}
}