Performance Research and Optimization of Sound Insulation Hood of Air Compressor Unit

The noise control of a compressor has always been a hot spot in the field of industrial application. In this paper, the air inlet structure of the sound insulation hood of an air compressor unit was studied and improved. Acoustic finite element numerical simulation analysis of the sound insulation hood model was carried out using the acoustic software LMS Virtual Lab Acoustics. The simulation results were compared with the experimental data to verify the correctness of the model, and the theoretical results showed a good agreement with the experiment data. The sound insulation performance of the sound insulation hood under different structures was also investigated in this paper. The results show that the main source of unit noise leakage is outward radiation through the air inlet. In addition, the noise at the air inlet of the unit and the overall noise were significantly reduced compared with the traditional sound insulation hood upon installing 120° and 90° diaphragm structures on the inner wall of the air inlet. The optimization results show that the noise reduction effect of the sound insulation hood with a 90° diaphragm structure was better than that with a 120° diaphragm structure.

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Changes in Floor Impact Sound Insulation Performance with Time

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.752-753.698 ◽

2015 ◽

Vol 752-753 ◽

pp. 698-701

Author(s):

Kyoung Woo Kim ◽

Jun Oh Yeon ◽

Kwan Seop Yang

Keyword(s):

Physical Characteristic ◽

Dynamic Stiffness ◽

Vibration Reduction ◽

Sound Insulation ◽

Degree Of Reduction ◽

Floor Structure ◽

Reduction Effect ◽

Sound Reduction ◽

Insulation Performance

Floating floor structures installed with resilient materials are commonly used to reduce sound from floor impacts. Resilient materials minimize the transmission of vibrations by absorbing shock vibrations occurring on the upper part. The floor impact sound reduction performance of resilient materials is related to the dynamic stiffness, which is a physical characteristic of materials. However, the dynamic stiffness varies according to the increase in the loading time of the load that is installed on the upper part of resilient materials. The dynamic stiffness values increase with an increase in the loading time; an increased dynamic stiffness value decreases the vibration reduction effect. The present study focuses on a floor structure installed with resilient materials, and identifies the degree of reduction in floor impact sound insulation performance with the elapse of time. The insulation of sound from lightweight impact sound decreased with the elapse of time, whereas the heavyweight impact sound did not show significant changes.

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FLOOR IMPACT SOUND INSULATION PERFORMANCE OF CLT FLOOR SLAB AND REDUCTION EFFECT BY FLOOR COVERINGS

AIJ Journal of Technology and Design ◽

10.3130/aijt.23.903 ◽

2017 ◽

Vol 23 (55) ◽

pp. 903-908

Author(s):

Manabu TANAKA ◽

Tsuyoshi MURAKAMI ◽

Yusuke KASAI ◽

Makoto KAWAI

Keyword(s):

Sound Insulation ◽

Floor Slab ◽

Floor Coverings ◽

Reduction Effect ◽

Insulation Performance

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Research on the Design of Sound Insulation Performance of Isolating-sound and decoupled tile Based on Local Resonance Membrane Material

Journal of Physics Conference Series ◽

10.1088/1742-6596/1750/1/012010 ◽

2021 ◽

Vol 1750 ◽

pp. 012010

Author(s):

Zongji Li ◽

Fangyong Zong ◽

Jian Zhang

Keyword(s):

Sound Insulation ◽

Membrane Material ◽

Local Resonance ◽

Insulation Performance

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Simulation Analysis of Indoor Particulate Matter Reduction Effect by Installing an Air Curtain in a Daycare Center

Korean Journal of Air-Conditioning and Refrigeration Engineering ◽

10.6110/kjacr.2021.33.8.404 ◽

2021 ◽

Vol 33 (8) ◽

pp. 404-412

Author(s):

Jung Min Park ◽

Seung Hwan Park ◽

So Woo Park ◽

Doo Sam Song

Keyword(s):

Particulate Matter ◽

Simulation Analysis ◽

Air Curtain ◽

Daycare Center ◽

Reduction Effect ◽

Indoor Particulate Matter

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Evaluation on the Airborne Sound Insulation Performance of Partition Walls between Housing Units in Modern New Han-oks

KIEAE Journal ◽

10.12813/kieae.2021.21.4.073 ◽

2021 ◽

Vol 21 (4) ◽

pp. 73-83

Author(s):

Ju-Yeob Lee

Keyword(s):

Sound Insulation ◽

Airborne Sound ◽

Partition Walls ◽

Insulation Performance ◽

Housing Units

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

INTER-NOISE and NOISE-CON Congress and Conference Proceedings ◽

10.3397/in-2021-2693 ◽

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

INTER-NOISE and NOISE-CON Congress and Conference Proceedings ◽

10.3397/in-2021-2298 ◽

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.

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