The effects of acoustical ceiling panel type and penetrations for services on vertical sound isolation inside buildings

2021 ◽  
Vol 263 (2) ◽  
pp. 4238-4245
Author(s):  
Gary Madaras
Keyword(s):  
Transmission Loss ◽  
Sound Intensity ◽  
Room Acoustics ◽  
Panel Type ◽  
Absorption Performance ◽  
Sound Transmission Class ◽  
The Individual ◽  
Sound Maps ◽  
Isolation Performance ◽  
Vertical Sound

Attenuation of sound transmitting between rooms oriented over one another inside buildings is studied. Transmission loss and sound transmission class were measured by an independent, accredited, acoustics laboratory with and without a variety of modular acoustic ceilings suspended under a baseline concrete floor structure. Ceiling panel material types include stone wool, fiberglass and mineral fiber. Ceilings were tested with and without the presence of service penetrations for supply air diffusers, return air grilles and light fixtures. Some ceilings were also scanned with a sound intensity probe and the resulting color sound maps are used as a supplemental method of evaluating both isolation and absorption performance of the individual components of the ceiling systems. Results show that while the effects of ceiling panel type on absorption performance, and thus room acoustics, is substantial, the material type and weight of the ceiling panels do not substantially affect the overall isolation performance of the floor-ceiling assembly.

Acoustical performance of horizontal-sliding-panel operable partition walls

2021 ◽  
Vol 263 (1) ◽  
pp. 5125-5130
Author(s):  
Jim Borzym
Keyword(s):  
Transmission Loss ◽  
Sound Transmission ◽  
Field Measurements ◽  
Field Conditions ◽  
Sound Transmission Loss ◽  
Airborne Sound ◽  
Partition Walls ◽  
Panel Type ◽  
Sound Transmission Class

Field measurements of airborne sound transmission loss were made on several operable partitions of the horizontal-sliding-panel type between conference rooms. Apparent Sound Transmission Class (ASTC) and Noise Isolation Class (NIC) ratings were computed. Very significant deviation of field-measured sound transmission ratings and manufacturers' Sound Transmission Class (STC) ratings were found. Clients were not satisfied by actual sound isolating performance. Transmission of voice was clearly audible. Some deficiencies of field conditions were found. Some deficiencies of partition installation were found. Modifications were made; acoustical performance did not change significantly.

Sound Radiation Characteristics of Lightweight Roof Constructions Excited by Rain

1994 ◽  
Vol 1 (4) ◽  
pp. 249-270 ◽  
Author(s):  
Hiromi Suga ◽  
Hideki Tachibana
Keyword(s):  
Transmission Loss ◽  
Power Level ◽  
Sound Radiation ◽  
Sound Intensity ◽  
Sound Power ◽  
Radiation Characteristics ◽  
Natural Rainfall ◽  
Artificial Rainfall ◽  
Sound Power Level ◽  
Measurement Results

In order to investigate the sound radiation characteristics of lightweight roof constructions when excited by rainfall, an artificial rainfall apparatus was constructed to simulate natural rainfall conditions. From the measurement results, it can be seen that the facility developed is practically applicable for the examination of the sound radiation characteristics of rain noise. It was therefore used in the measurement of sound power of 20 lightweight roofs. In addition, the relationship between sound power level and sound transmission loss measured by the sound intensity method was investigated statistically. As a result, it has been shown that a linear relationship exists between them and there is a possibility of estimating the sound power level from the transmission loss.

Beam Tracing with Refraction

2012 ◽  
Vol 37 (3) ◽  
pp. 301-316 ◽  
Author(s):  
Marjan Sikora ◽  
Ivo Mateljan ◽  
Nikola Bogunović
Keyword(s):  
Good Accuracy ◽  
Sound Propagation ◽  
Fem Simulation ◽  
Sound Intensity ◽  
Room Acoustics ◽  
Acoustic Lens ◽  
Refraction Method ◽  
Art Room ◽  
2D And 3D ◽  
3D Topology

Abstract This paper presents the beam tracing with refraction method, developed to examine the possibility of creating the beam tracing simulation of sound propagation in environments with piecewise non- homogenous media. The beam tracing with refraction method (BTR) is developed as an adaptive beam tracing method that simulates not only the reflection but also the refraction of sound. The scattering and the diffraction of sound are not simulated. The BTR employs 2D and 3D topology in order to efficiently simulate scenes containing non-convex media. After the beam tracing is done all beams are stored in a beam tree and kept in the computer memory. The level of sound intensity at the beginning of each beam is also memorized. This beam data structure enables fast recalculation of results for stationary source and geometry. The BTR was compared with two commercial ray tracing simulations, to check the speed of BTR algorithms. This comparison demonstrated that the BTR has a performance similar to state-of- the-art room-acoustics simulations. To check the ability to simulate refraction, the BTR was compared with a commercial Finite Elements Method (FEM) simulation. In this comparison the BTR simulated the focusing of the ultrasound with an acoustic lens, with good accuracy and excellent performance.

Study on the Vibro-Acoustic Characteristics of a Vibration Isolation Mass Structure with Composite Braces

2011 ◽  
Vol 117-119 ◽  
pp. 85-88
Author(s):  
Di Jia ◽  
Fu Zhen Pang ◽  
Xu Chao Yin ◽  
Ye Xi
Keyword(s):  
Vibration Isolation ◽  
Transmission Loss ◽  
Flexural Wave ◽  
Acoustic Characteristics ◽  
Damping Material ◽  
Section Size ◽  
Vibration And Sound Radiation ◽  
Vibration Isolation Performance ◽  
Isolation Performance ◽  
Material Study

In this paper a vibration isolation mass structure with composite braces is proposed to reduce noise and vibration transmission through the hull and internals of a double cylindrical shell. Influence of the various complicating effects such as vibration isolation mass’s cross section size or the layout location on the vibration isolation performance of composite braces structure are discussed. Besides, we also provide a composite structure form with high transmission loss due to the theory of vibration insulation of isolation mass and noise reduction of damping material. Study shows that composite braces structure combined the appropriate vibration isolation mass with viscoelastic material can effectively decrease the hull vibration and sound radiation in the mid-high frequency domain, which can significantly attenuate transmission of the plate flexural wave.

Computer Simulations of Room Acoustics in Sporting Facilities

2013 ◽  
Vol 649 ◽  
pp. 57-60
Author(s):  
Zuzana Kolářová ◽  
Libor Šteffek ◽  
František Vajkay
Keyword(s):  
Room Acoustics ◽  
Building Structures ◽  
Reverberation Time ◽  
Acoustic Parameters ◽  
Main Emphasis ◽  
Master Thesis ◽  
Sporting Activities ◽  
The Individual ◽  
The Given ◽  
Indoor Spaces

The paper is focused on a solution with regards to acoustic problems inside of facilities for sporting activities. The evaluation of the acoustic parameters of the interior was done within a project called "Badminton Centre with Facilities", which was part of a master thesis at the Institute of Building Structures of the Faculty of Civil Engineering, BUT Brno. The given solution and design took into account not only the requirements given by the legislation dealing with building acoustics, but the aesthetical viewpoint of the individual acoustically absorbing surfaces also. The simulations were done in Odeon Auditorium software, which is specialized for the modelling of indoor spaces of buildings. The results of simulations are presented in octave bands with a frequency range of 250-2000 Hz, while the main emphasis is put onto the monitoring of the reverberation time.

The application of vertical sound intensity in shallow and low frequency sound field

2011 ◽  
Author(s):  
Sheng Xue Li ◽  
Mei Ji Dan ◽  
Guo Yong ◽  
Yin Jing Wei ◽  
Guo Long Xiang
Keyword(s):  
Low Frequency ◽  
Sound Field ◽  
Sound Intensity ◽  
Frequency Sound ◽  
Vertical Sound
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