scholarly journals FUNDAMENTAL STUDY ON PRACTICAL PREDICTION METHOD OF LIGHT-WEIGHT FLOOR IMPACT SOUND LEVEL REDUCTION OF DRY FLOATING FLOOR STRUCTURE

2021 ◽  
Vol 86 (781) ◽  
pp. 237-247
Author(s):  
Takeshi ISHIMARU ◽  
Yuki TAKANE ◽  
Satoshi KUME ◽  
Taku KUROKI ◽  
Masanao OWAKI ◽  
...  
Keyword(s):  
Prediction Method ◽  
Sound Level ◽  
Light Weight ◽  
Fundamental Study ◽  
Floor Structure ◽  
Level Reduction

Effect of ceiling and dry-type double floor on heavy-weight floor impact sound in concrete building and CLT building.

2021 ◽  
Vol 263 (3) ◽  
pp. 3064-3072
Author(s):  
Takashi Yamauchi ◽  
Atsuo Hiramitsu ◽  
Susumu Hirakawa
Keyword(s):  
Frequency Band ◽  
Sound Level ◽  
Center Frequency ◽  
Sound Insulation ◽  
Octave Band ◽  
Band Center ◽  
Heavy Weight ◽  
Concrete Building ◽  
Floor Structure ◽  
Insulation Performance

The air layer between the interior finishes and the structure is used as piping and wiring space. In many cases, ceilings and dry-type double floors are commonly constructed in Japan. However, the effect of the air layer of ceilings and dry-type double floors on the heavy-weight floor impact sound insulation performance has not yet quantitatively investigated. Therefore, in this study, the same floor and ceiling structures were constructed for concrete and CLT buildings, and the heavy-weight floor impact sound was investigated. As results, it was confirmed that the reduction amount of the heavy-weight floor impact sound by the ceiling tended to be smaller in CLT buildings than in concrete buildings. However, the trends were similar. Due to the dry-type double floor structure, the heavy-weight floor impact sound level was increased in concrete building and decreased in CLT building at 63 Hz in the octave band center frequency band. Therefore, it can be said that the dry-type double floor structure can be used to improve the heavy-weight floor impact sound performance in the CLT building.

Fundamental Study of Traffic Noise Characteristic due to Change Transverse Rumble Strip Shape

2013 ◽  
Vol 723 ◽  
pp. 113-120 ◽  
Author(s):  
Jae Jun Lee ◽  
Deok Soon An ◽  
Jae Kyu Lim ◽  
Soo Ahn Kwon ◽  
Hyeon Jang Son ◽  
...  
Keyword(s):  
Traffic Noise ◽  
Sound Level ◽  
Main Function ◽  
Fundamental Study ◽  
Horizontal Curves ◽  
Vehicle Type ◽  
Toll Plazas ◽  
Strip Shape ◽  
Cement Concrete Pavement ◽  
Rumble Strip

Transverse rumble strips were commonly installed on approaches to intersections, toll plazas, and horizontal curves. The main function is to alert drivers by creating noise and vibration. This TRS has been demonstrated to be effective in reducing traffic accident due to sleeping. However, there are some disadvantages in its utilization, such as traffic noise produced by TRS. The objective of this study was to quantify the level of traffic noise; to verify the effects of speed and TRS shapes. Two types of vehicles [sedan and minivan] were driven over four different patterns of TRS and over cement concrete pavement at four different speeds. Researchers measured the produce noise at 7.5m distance with 1.2 m height from center of the vehicle lane at each test section. Results indicate that vehicle type, speed, TRS shape affects created traffic noise. The sound level of Type A was statistically highest among others.

Countermeasures against floor impact sound by heavy impact source of a box floor structure in a reinforced concrete wall construction testing device

2021 ◽  
Vol 263 (5) ◽  
pp. 1396-1404
Author(s):  
Ryuta Tomita ◽  
Kyoko Abe
Keyword(s):  
Reinforced Concrete ◽  
Sound Level ◽  
Sound Insulation ◽  
Testing Device ◽  
Concrete Wall ◽  
Heavy Weight ◽  
Floor Structure ◽  
Reinforced Concrete Wall ◽  
Wall Construction ◽  
Bare Surface

We have performed experimental examinations for the purpose of proposing a floor finishing structure with superior effects in terms of combating heavy-weight floor impact sound. We have developed a box floor with ease of construction and excellent heavy-weight floor impact sound insulation performance and examined its effect with a 1200 × 1200 mm test piece connected to inter-noise 2020. The box floor has a floor finishing structure with anti-vibration and sound insulation measures aimed at improving measures against heavy-weight floor impact sound. We herein report the results of a basic examination on the reduction of the transmitted heavy-weight floor impact sound of a box floor structure in a reinforced concrete wall construction testing device when the area is further expanded to about 10 . As a result, with the air layer under the box floor open, the floor impact sound level was reduced by 9 dB in the 63-Hz band compared to the bare surface. In addition, with the air layer at the bottom of the BOX floor sealed, the floor impact sound level was reduced by 5 dB in the 63-Hz band compared to the bare surface.

Prediction and analysis of sound field in long enclosures with a modal-based method

2021 ◽  
Vol 69 (6) ◽  
pp. 518-529
Author(s):  
Changyong Jiang ◽  
Xiang Liu ◽  
Stephany Y. Xu ◽  
Shangyu Zhang
Keyword(s):  
Porous Material ◽  
Point Source ◽  
Sound Pressure Level ◽  
High Frequency ◽  
Sound Pressure ◽  
Prediction Method ◽  
Sound Field ◽  
Pressure Level ◽  
Noise Levels ◽  
Level Reduction

In this paper, the efficacy of porous ceiling treatment to reduce noise levels inside a typical tunnel is examined with a validated modal-based prediction method. It is found that, for a point source, the effect of increasing porous ceiling thickness on sound pressure level (SPL) attenuation along the tunnel is limited. A porous ceiling with thickness of 0.3 m is comparable with an infinite porous ceiling in middle and high frequency ranges. For a line source, the effect of ceiling thickness on SPL reduc- tion in this typical tunnel is limited. Sound pressure level reduction of 4 dBA is real- ized with 0.3 m porous ceiling, which is the same as infinite ceiling and only 1 dBA smaller than the theoretically optimized value. These results suggest that, in the event only ceiling treatment is considered, 0.3 m porous material is sufficient for noise re- duction in this typical tunnel.

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