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RISS 인기검색어
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- 저자 : 김철곤(Cheulgon Kim) (검색결과 2 건)
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김철곤(Cheulgon Kim),황지훈(Jihoon Hwang),서형준(Hyeongjoon Seo),모진용(Jinyong Mo),정두한(Duhan Jung),홍석무(Seokmoo Hong) 대한기계학회 2015 大韓機械學會論文集A Vol.39 No.4
에어컨 실내기 조립 시 부품간 간섭이 발생하는 위치와 원인 분석을 위해, 3차원 공차해석을 수행하고 부품공차 및 조립 갭을 최적화했다. 민감도 분석을 통해 초기 설계에서 drain과 body 조립부의 불량발생 확률이 72.6%로 가장 높은 것을 확인했고, 또한 유한요소해석(FEA)을 활용 에어컨 실내기의 난방작동 시 열 변형으로 인해 최대 약 1mm의 변위가 발생하여 부품간 간섭이 발생할 수 있음을 확인했다. 이런 부품간 간섭을 최소화기 위해서 3D 공차 해석의 민감도 분석결과를 토대로 drain의 부품공차를 수정하였다. 개선 공차 반영 해석결과 불량률이 0.03%로 크게 감소함을 확인하였다. 또한, 개선공차 반영 시 에어컨 작동 중 열 변형이 발생하여도 부품간 간섭이 발생하지 않음을 FEA를 통해 검증하였다. To identify locations and causes of interference among parts of an indoor air-conditioning unit, a 3D tolerance analysis was performed and optimized with respect to assembly gaps and the tolerance of each part . The maximum value of the defect rate resulting from the tolerance analysis was found to be 72.6 at the assembly portion of the body and drain. The maximum displacement caused by the thermal deformation during a heating operation was calculated to be approximately 1 mm by using finite element analysis (FEA). Therefore, it is possible that an interference among the assembled parts occurs. The tolerance of the drain was modified by the results of the sensitivity analysis. As a result, the defect rate was greatly reduced to 0.03. Through the FEA results of the indoor air?conditioning unit , it was shown that the improved tolerance of the drain decreased the interference among the assembled parts even though thermal deformation occurs during operation.
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에어컨 실내기 사출 조립품의 열 변형 3D측정과 유한요소해석
홍석무(Seokmoo Hong),황지훈(Jihoon Hwang),김철곤(Cheulgon Kim),엄성욱(Seong-uk Eom) 한국생산제조학회 2015 한국생산제조학회지 Vol.24 No.2
Thermal deformation, such as bending and twisting, occurs among the polymer parts of air-conditioner indoor units because of repetitive temperature change during heating operation. In this study, a numerical method employing finite-element analysis to efficiently simulate the thermal deformation of an assembly is proposed. Firstly, the displacement of an actual assembly produced by thermal deformation was measured using a 3D optical measurement system. The measurement results indicated a general downward sag of the assembly, and the maximum displacement value was approximately 1 mm. The temperature distribution was measured using a thermographic camera, and the results were used as initial-temperature boundary conditions to perform temperature-displacement analysis. The simulation results agreed well with the measured data. To reduce the thermal deformation, the stiffness increased 100%. As the results, the maximum displacement decreased by approximately 5.4% and the twisting deformation of the holder improved significantly.
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