Influence of Perforated Ceiling on Floor Impact Sound Insulation in Reinforced Concrete Buildings

In this study, the influence of a perforated ceiling on the floor impact sound was investigated. The floor impact sound measurements were conducted both with and without suspended ceiling including the perforated and nonperforated panel, using heavy and light weight impact sources in a reinforced concrete test building. The results indicated that the perforated ceiling with and without absorption sheet greatly reduced the resonance of floor impact sound by the non-perforated ceiling. However, the perforated ceiling without an absorption sheet did not improve the single number quantity (SNQ, rubber ball: L′iA,Fmax,V.T and tapping machine: L′n,w) for the floor impact sound insulation. The perforated ceiling with attached absorption sheet produced SNQs of 2 dB lower and higher than that produced by the non-perforated ceiling for heavy and light weight impact sources, respectively. It was also found that the improvement in the floor impact sound insulation after the installation of the perforated ceiling was related to the mass-spring-mass system, rather than the absorption area of the receiving room.

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STUDY OF ALTERNATIVE FLOOR AND CEILING SOUND INSULATION MEASURES AIMED AT REDUCING NOISE FROM AIR BORNE SOUND AND LIGHT-WEIGHT IMPACT SOUND ON CONVENTIONAL WOODEN FLOORS

Journal of Architecture and Planning (Transactions of AIJ) ◽

10.3130/aija.65.1_6 ◽

2000 ◽

Vol 65 (532) ◽

pp. 1-6

Author(s):

Norihiko KAMATA ◽

Tomohito HIROTA ◽

Hirotaka SUZUKI

Keyword(s):

Sound Insulation ◽

Light Weight ◽

Weight Impact

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Perceived Loudness of Sound Transmitted through Light Weight and Heavy Weight Walls

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.649.101 ◽

2013 ◽

Vol 649 ◽

pp. 101-104 ◽

Cited By ~ 1

Author(s):

Monika Rychtáriková ◽

Bert Roozen ◽

Herbert Müllner ◽

Mathias Stani ◽

Vojtech Chmelík ◽

...

Keyword(s):

Traffic Noise ◽

Sound Level ◽

Sound Insulation ◽

Living Room ◽

Light Weight ◽

Low Frequencies ◽

Policy Makers ◽

Draft Standard ◽

Single Number ◽

Human Hearing

When assessing the sound insulation quality of buildings constructions, policy makers and investors typically demand for single number ratings and sound insulation classes that allow for easy ranking of building products. Converting the full frequency content of a precisely measured or calculated structure into a single number, which takes into account all aspects of the insulation performance in a balanced way, is a challenging task. The recently proposed draft standard 717 proposes to take into account also frequencies below 100 Hz. This makes the single value rating even more complicated, since the transmission spectra R (dB) of walls can be qualitatively very different above and below 100 Hz, and even more, since, particularly at low frequencies, human hearing depends not only on frequency but also on the absolute sound level. This article presents a comparison between masonry and light-weight walls with different R value, in terms of the perception of loudness of typical living room, traffic noise and machinery noise transmitted through the walls. The effect of temporal and spectral features of the presented stimuli on loudness perception is analyzed.

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Simulation and Analysis of Two-Mass Suspension Modification Using MATLAB Programming

ACMIT Proceedings ◽

10.33555/acmit.v3i1.39 ◽

2019 ◽

Vol 3 (1) ◽

pp. 160-165

Author(s):

Hendry D. Chahyadi

Keyword(s):

Vibrational Energy ◽

State Space Model ◽

Mass System ◽

Modeling And Analysis ◽

The Road ◽

Final Project ◽

Quarter Car ◽

Automotive Suspension ◽

Mass Spring ◽

Matlab Programming

The designs of automotive suspension system are aiming to avoid vibration generated by road condition interference to the driver. This final project is about a quarter car modeling with simulation modeling and analysis of Two-Mass modeling. Both existing and new modeling are being compared with additional spring in the sprung mass system. MATLAB program is developed to analyze using a state space model. The program developed here can be used for analyzing models of cars and vehicles with 2DOF. The quarter car modelling is basically a mass spring damping system with the car serving as the mass, the suspension coil as the spring, and the shock absorber as the damper. The existing modeling is well-known model for simulating vehicle suspension performance. The spring performs the role of supporting the static weight of the vehicle while the damper helps in dissipating the vibrational energy and limiting the input from the road that is transmitted to the vehicle. The performance of modified modelling by adding extra spring in the sprung mass system provides more comfort to the driver. Later on this project there will be comparison graphic which the output is resulting on the higher level of damping system efficiency that leads to the riding quality.

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