An effective method to reduce the contraction and expansion noise of air conditioner

Kang-Hwan Kim; Won-Jin Kim

doi:10.7776/ASK.2020.39.2.098

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2020 Vol.39, Issue 2 Preview Page Next Page

Research Article

An effective method to reduce the contraction and expansion noise of air conditioner 에어컨 실내기의 수축팽창 소음 저감 방법

31 March 2020. pp. 98-104

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Abstract

A method to reduce the Contraction and Expansion (CE) noise occurred in an air conditioner is investigated. The noise is measured during the cooling and heating phases in a temperature and humidity chamber to identify the generating phenomenon of CE noise of the air conditioner and the decomposition method is used to estimate its occurrence location. The CE noise of an air conditioner is known to be caused by a stick-slip phenomenon generated by joints of parts connected to the lower decor. Thus a friction experiment was conducted to investigate noise inducing factors. Also, this study established evaluation criteria to effectively analyze the results from friction experiments. Experimental results indicate that increasing surface roughness on both sides of joints is effective. Accordingly, the effect of increased surface roughness on joints of upper and lower decor of air conditioners is evaluated to see its feasibility in a temperature and humidity chamber.

Keywords

Contraction and expansion noise

Stick-slip

Decompositon method

Friction experiment

Surface roughness

에어컨 운전 중에 발생하는 실내기의 수축팽창 소음 현상을 분석하고 , 발생위치를 평가한다. 그리고 마찰실험을 통하여 수축팽창 소음을 유발하는 인자를 규명하고자 한다. 먼저 항온·항습챔버에서 운전 환경 조건별로 수축팽창 소음의 발생횟수 및 특성을 분석하고, 분해법을 이용하여 냉방 및 난방 시 모두 하부 데코에서 발생하는 것을 확인하였다. 실내기에서 발생하는 수축팽창 소음은 하부 데코와 연결되는 부품들과의 체결부에서 발생하는 스틱슬립 현상에 의한 것으로 이러한 소음을 유발하는 인자를 규명하기 위하여 마찰실험을 진행하였다. 또한 마찰실험 결과의 효과적 분석을 위하여 십점평균 산출법을 도입하고, 실험 결과에서 Acrylonitrile Butadiene Styrene(ABS) 재질 간에 접촉하면 스틱슬립 현상을 유발하며 체결부의 양면에 표면조도를 증가하는 것이 소음저감에 효과적임을 확인하였다.

키워드

수축팽창 소음

스틱슬립

분해법

마찰실험

표면조도

References

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10.4271/972056

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Information

Publisher :The Acoustical Society of Korea
Publisher(Ko) :한국음향학회
Journal Title :The Journal of the Acoustical Society of Korea
Journal Title(Ko) :한국음향학회지
Volume : 39
No :2
Pages :98-104
Received Date : 2019-12-26
Revised Date : 2020-02-11
Accepted Date : 2020-02-11
DOI :https://doi.org/10.7776/ASK.2020.39.2.098

The Journal of the Acoustical Society of Korea ISSN:1225-4428(Print) 2287-3775(Online) 한국음향학회지

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