scholarly journals The Influence of Floor Layering on Airborne Sound Insulation and Impact Noise Reduction: A Study on Cross Laminated Timber (CLT) Structures

2021 ◽  
Vol 11 (13) ◽  
pp. 5938
Author(s):  
Federica Bettarello ◽  
Andrea Gasparella ◽  
Marco Caniato
Keyword(s):  
Noise Reduction ◽  
Noise Source ◽  
Field Measurements ◽  
Sound Insulation ◽  
Sound Sources ◽  
Cross Laminated Timber ◽  
Impact Noise ◽  
Timber Constructions ◽  
Indoor Comfort ◽  
Testing Design

The use of timber constructions recently increased. In particular, Cross Laminated Timber floors are often used in multi-story buildings. The development of standardization processes, product testing, design of details and joints, the speed of construction, and the advantages of eco-sustainability are the main reasons why these structures play a paramount role on the international building scene. However, for further developments, it is essential to investigate sound insulation properties, in order to meet the requirements of indoor comfort and comply with current building regulations. This work presents the results obtained by in field measurements developed using different sound sources (tapping machine, impact rubber ball, and airborne dodecahedral speaker) on Cross Laminated Timber floors, changing different sound insulation layering (suspended ceiling and floating floors). Results clearly show that the influence on noise reduction caused by different layering stimulated by diverse noise source is not constant and furthermore that no available analytical model is able to correctly predict Cross Laminated Timber floors acoustic performances.

Case Study: Laboratory and Field Measurements for Evaluating the Weighted Reduction in Impact Noise Associated with Floor Coverings

2002 ◽  
Vol 9 (2) ◽  
pp. 151-162 ◽  
Author(s):  
Jorge Patrício
Keyword(s):  
Field Measurements ◽  
Design Stage ◽  
Sound Insulation ◽  
Horizontal Beam ◽  
Impact Noise ◽  
Loudness Level ◽  
Floor Coverings ◽  
The Difference ◽  
Study Laboratory

In order that impact sound insulation in buildings complies with national regulations, the use of floor coverings needs to be considered, either at the design stage, or as a corrective measure. The improvement of impact sound insulation for floor coverings shown in marketing literature, comes from laboratory tests, expressed as the difference between the values of bare and covered floor noise insulation indices, calculated in accordance with what is prescribed in standard EN ISO 717/2. However, the values of the improvement for the same product are sometimes very different from laboratory to on-site conditions. This problem is more acute for buildings with non-homogenous floors such as beam-block. This case study presents some tests performed on identical horizontal beam-block slabs, in the laboratory and on site, using the same floor coverings. Discrepancies in the values obtained for the characterisation of each floor covering are observed. Assuming that part of the problem could be linked to the type of index used, a comparison is made using the following metrics: ΔdB(A); ΔLn,w (or ΔL3n,w – when on site); and the difference of Loudness Level.

Research on Noise Reduction in Boiler Room - An Actual Case on North Boiler Room

2011 ◽  
Vol 467-469 ◽  
pp. 2159-2162
Author(s):  
Ji Hong Zhou ◽  
Jian Guo Tan ◽  
Hong Xia Wang ◽  
Hai Zhen Ma
Keyword(s):  
Noise Reduction ◽  
Spectrum Analysis ◽  
Reduction Method ◽  
Noise Source ◽  
Noise Pollution ◽  
Sound Insulation ◽  
Actual Case ◽  
Absorbing Material ◽  
Boiler Room ◽  
Induced Draft Fan

As to the noise pollution of the Hebei University of Engineering north boiler room, we have conducted a series of actual research, monitoring, and analysis of the spectrum of various monitoring sites. According to the results of the spectrum analysis, we found the noise source and proposed noise reduction measures, namely the establishment of sound insulation room in which the drums and induced draft fan installed, and the wall of the room are appended acoustic sound--absorbing material. The results show that this noise reduction method is feasible.

Noise Control on Chiller with Ammonia Based on Vibration-Acoustics Analysis in Mechanical Engineering

2013 ◽  
Vol 644 ◽  
pp. 294-297
Author(s):  
Huan Liu ◽  
Chang Zheng Chen ◽  
Hao Zhou
Keyword(s):  
Noise Reduction ◽  
Vibration Spectrum ◽  
Noise Source ◽  
Working Environment ◽  
Good Effect ◽  
Sound Insulation ◽  
Design And Manufacturing ◽  
Practical Engineering ◽  
Made In

Noise detection and vibration analysis have been made in the enterprise where screw compressor unit has been running with problems for a long term. According to the characteristics of noise and vibration spectrum, ammonia refrigeration operation fault and noise source have been analyzed, and a noise reduction scheme is made. Based on this, through the optimization of compound sound absorbing structure parameters design and manufacturing device of sound insulation, thereby hidden safety trouble can be eliminated and the working environment of workers can be improved. Besides, mechanical properties of the compressor group are more stable. In practical engineering applications, good effect of noise reduction has been achieved.

Sound attenuation and audibility of fire alarm signal in Korean residential apartment buildings: A case study

2017 ◽  
Vol 27 (5) ◽  
pp. 690-705
Author(s):  
Min-Joo Lee ◽  
Myung-Jun Kim
Keyword(s):  
Residential Buildings ◽  
Field Measurements ◽  
Sound Level ◽  
Sound Attenuation ◽  
Sound Insulation ◽  
Sound Sources ◽  
Fire Alarm ◽  
Apartment Buildings ◽  
Closed Door ◽  
Insulation Performance

With a view to preventing casualties due to fire outbreaks in residential buildings, we investigated the sound attenuation of audible fire-alarm signals in Korean residential apartment buildings and determine an acoustic condition for enhancing the audibility of such signals. Two sets of field measurements were performed, along with theoretical predictions using sound analysis software. In the first set of measurements, in 17 dwelling units, the standardized alarm sound level requirement of 75 dBA could not be achieved in bedrooms with existing alarm devices. In the second set of measurements, with an additional five dwelling units, both the sound attenuation according to the distance between sound sources and bedrooms and the sound insulation performance of bedroom doors were examined. The sound attenuation levels were increased by 0.72 ( R2 = 0.7982) and 0.48 ( R2 = 0.3001) dB m−1 under open- and closed-door conditions, respectively. Further, the bedroom-door sound insulation performance was in the 18- to 23-dB range. Consequently, we have demonstrated that the sound power of a general residential fire alarm must be 98–107.9 dB, depending on the dwelling-unit size and floor-plan type, in order to achieve a bedroom audibility level of 75 dBA.

A Simplified Method for Field Measurement of Airborne Sound and Impact Sound Insulation in Buildings

1994 ◽  
Vol 1 (2) ◽  
pp. 137-149
Author(s):  
Liang Min ◽  
W.U. Dasheng ◽  
Zhang Xiying
Keyword(s):  
Field Measurement ◽  
Noise Source ◽  
Sound Level ◽  
Test Method ◽  
Sound Insulation ◽  
Octave Band ◽  
Level Measurement ◽  
Impact Noise ◽  
Simplified Method ◽  
Short Test

A simplified method is investigated to be developed for use by building control inspectors or persons undertaking a similar role to allow a fast and simple check to be carried out on both air-borne and impact sound insulation between rooms. This paper proposes a short test method, in which a standard impact noise source is employed as a simplified source and one third octave band sound level measurement is simplified by A-weighting.

Effect of different types of ceilings on floor impact sound insulation performance in CLT model building

2021 ◽  
Vol 263 (2) ◽  
pp. 4402-4409
Author(s):  
Atsuo Hiramitsu ◽  
Susumu Hirakawa ◽  
Takahiro Tsuchimoto ◽  
Takashi Yamauchi
Keyword(s):  
Model Building ◽  
Sound Insulation ◽  
Impact Noise ◽  
Timber Construction ◽  
Stress Relieving ◽  
Measurement Results ◽  
Absorbing Material ◽  
Vibration Insulator ◽  
Effective Use ◽  
Insulation Performance

The floor impact noise generated in a building often causes problems among residents. The floor impact sound insulation performance of timber construction buildings is lower than that of concrete construction. However, due to the large supply of wood and the stress-relieving effects of wood, the use of wood is being promoted around the world. In Japan, the Act on the Promotion of the Utilization of Wood in Public Buildings was enforced to promote the use of CLT (Cross Laminated Timber) for the effective use of wood. We have been experimentally investigating the effect of floor finish structure in CLT model building. In this paper, we report the measurement results of the change in floor impact sound insulation performance when the suspended ceiling structure was changed. As results, it was confirmed that the effect of the sound-absorbing material in the ceiling cavity and the effect of the double-layer ceiling board were effective. In addition, it was clarified that the dry-type double floor structure with rubber vibration insulator on its legs is an effective floor finish structure for improvement of heavy and light weight floor impact sound insulation performances.

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