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유한요소법을 이용한 우레탄 휠의 구조 안전성에 관한 연구
송하종(H. J. Song),정일호(I. H. Jung),이수호(S. H. Lee),박태원(T. W. Park),박중경(J. K. Park),이형(H. Lee),조동협(D. H. Cho),김혁(H. Kim),이경목(M. K. Lee) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
Urethane is a high polymeric and elastic material useful in designing mechanic parts that cannot be molded in rubber or plastic material. Especially, urethane is high in mechanical strength and anti-abrasive. Hereby, an urethane coated aluminum wheel is used for supporting of OHT vehicle moving back and forth to transport products. For the sake of verifying the safety of the vehicle, structural safety for applied maximum dynamic load on a urethane wheel needs to be carefully examined while driving. Therefore, we have performed the dynamic simulation on the OHT vehicle model. Although the area definition of applied load can be obtained from the previous study of Hertzian and Non-Hertzian contact force model when having exact properties of contact material, static analysis is simulated, since the proper material properties of urethane have not been guaranteed, after we have performed the actual contact area test for each load. In case of this study, the method of distributing load for each node is included. Finally, in comparison with result of analysis and load-displacement curve obtained from the compression test, we have defined the material properties of urethane. In the analysis, we have verified the safety of the wheel. After all, we have performed a mode analysis using the obtained material properties. With the result, we have the reliable finite element model.
안내궤도 차량부품 피로수명 예측을 위한 해석 모델 개발
송하종(Ha Jong Song),우준성(Jun Sung Woo),윤지원(Ji Won Yoon),박태원(Tae Won Park),박중경(Joong Kyung Park),조동협(Dong Hyub Cho),김혁(Hyuk Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
A guideway vehicle is used in the automotive, semiconductor and LCD manufacturing industries for transportation of products. Recently, as guideway vehicle has required more light-weight and higher operating speed, fatigue life prediction of components becomes the major contents. To predict the fatigue life, it is necessary to obtain the dynamic stress time history of components. In this study, Dynamic model of guideway vehicle is developed by using the multi body dynamic analysis program and finite element models of wheels and main frame are developed. The result of dynamic analysis was verified by the vehicle traveling test. And a finite element model is verified by the wheel compression test. With these results, the reliable dynamic and finite element model are developed for the fatigue study.
유한요소법을 이용한 우레탄 휠의 구조 안전성에 관한 연구
송하종(Ha Jong Song),정일호(Il Ho Jong),박태원(Tae Won Park),윤지원(Ji Won Yoon),전갑진(Kab Jin Jun),박중경(Joong Kyung Park),이형(Hyung Lee) Korean Society for Precision Engineering 2005 한국정밀공학회지 Vol.22 No.10
Urethane is a high polymeric and elastic material useful in designing mechanic parts that cannot be molded with rubber or plastic material. In particular, urethane is high in mechanical strength and anti-abrasive. Hereby, a urethane coated aluminum wheel is used to support of the OHT vehicle moving back and forth to transport products. For the sake of verifying the safety of the vehicle, structural safety for applied maximum dynamic load on a urethane wheel must be examined carefully while driving. Therefore, we performed a dynamic simulation on the OHT vehicle model and we determined the driving load. The area definition of applied load may be obtained from the previous study of Hertzian and Non-Hertzian contact force model having exact properties of contact material. But the static analysis is simulated after we have performed the actual contact area test for each load since the proper material properties of urethane have not been guaranteed. In this study, the method of distributing loads for each node is included. Finally, in coMParison with the results of analysis and load-displacement curve obtained from the compression test, we have defined the material properties of urethane. In the analysis, we verified the safety of the wheel. Finally, we performed a mode analysis using the obtained material properties. With these results, we presented a reliable finite element model.
Engine cooling airflow의 공기 저항에 관한 수치적 연구
송봉하(Bongha Song),이규익(Kyuik Lee),하종백(Jonpaek Ha) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
These days, the fuel economy of road vehicles is getting important all over the world due to the several reasons such as the depletion of fossil fuel, high fuel cost, and stringent regulation of toxic exhaust gas from conventional internal engine combustion. Therefore, all auto makers are requested to develop a vehicle with high fuel efficiency as a demand of times. In this view point, aerodynamics can contribute considerably to solve these demands from customers. Total drag of road vehicle is mainly composed of three parts, exterior skin effect from upper body, underbody effect, and cooling drag. Especially, drag increment from engine cooling airflow need to be minimized for better aerodynamic and powertrain cooling performances through the optimization of front-end styling. Aerodynamics friendly front-end styling is completed by the grille inlet opening and CRFM sealing which are represented by baffle and gap seal. In this research, the drag impact on cooling airflow is studied using CFD analysis. The analysis results showed that grille inlet opening can be closed by reducing the cooling air leakage from grille inlet airflow to heat exchanger. Finally, the closing of non-effective opening are through the optimization of CRFM sealing using baffle and gap seal gave us dramatic aerodynamic saving effect, and therefore it helps the fuel economy.
냉각 공기 유동 최적화를 통한 공력 성능 향상에 관한 수치적 연구
송봉하(Bongha Song),이규익(Kyuik Lee),하종백(Jongpaek Ha) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
These days, the fuel economy of road vehicles is getting important all over the world due to the several reasons such as the depletion of fossil fuel, high fuel cost, and stringent regulation of toxic exhaust gas from conventional internal engine combustion. Therefore, all auto makers have been requested to develop a vehicle with high fuel efficiency as a demand of times. In this view point, aerodynamics is well known as a big potential which can contribute considerably to solve these demands from customers. Total drag of road vehicle is mainly composed of three parts, exterior skin effect from upper body, underbody effect, and engine room’s flow recirculation effect driven by engine cooling air flow. Especially, drag increment from engine cooling air flow needs to be minimized for better aerodynamic performance through the optimization of front-end styling. However, P/T cooling performance has also to be considered carefully because there is a trade-off relationship between aerodynamics and engine cooling performance. In this research, the drag impact on cooling air flow was studied using CFD analysis. Aerodynamics friendly cooling air flow system is completed by the optimization of front grille inlet opening, cooling air outlet, and CRFM sealing, which is represented by baffle and gap seal. The analysis results showed that grille inlet opening could be closed by reducing the leakage of cooling air flow from grille inlet to heat exchanger. Finally, the closing of noneffective grille inlet opening driven by the optimization of CRFM sealing using baffle and gap seal gave us dramatic aerodynamic saving effect, and therefore it will help the fuel economy. The size of cooling air outlet also showed that the bigger the size, the better the aerodynamic performance.
연비향상을 위해 최적화된 opening을 이용한 aerodynamic front end styling
이규익(Kyuik Lee),송봉하(Bongha Song),하종백(Jonpaek Ha),이태원(Taewon Lee) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
As the environmental disruption caused by the vehicle is emerged, new vehicles with high fuel efficiency are needed. To improve fuel efficiency, vehicles have certainly the low aerodynamic drag coefficient. This paper is mainly purposed to reduce aerodynamic drag coefficient using the optimized opening for fuel efficiency front end styling by using CFD analysis. There are two ways to reduce aerodynamic drag coefficient in this paper. First one is to lower air leakage from front opening to CRFM module. Second one is to have the optimized opening. As a result, this paper showed that aerodynamic drag coefficient was reduced by lowering leakage and front opening. Also engine cooling performance was increased with aero-friendly styling.
유한요소법을 이용한 냉각홴의 진동 및 간섭에 관한 연구
서종휘(Seo, Jong-Hwi),송하종(Song, Ha-Jong),박태원(Park, Tae-Won),김주용(Kim, Joo-Yong),정일호(Jung, Il-Ho) 한국소음진동공학회 2004 한국소음진동공학회 논문집 Vol.14 No.9
A CFA(cooling fan assembly) is composed of a fan, motor and shroud, which is at the back of the automotive radiator. By forcing the wind to pass, the CFA controls the cooling performance of the radiator. The noise and vibration of the CFA may be primarily due to the resonance between the CFA and engine. The Interference among the fan, shroud and radiator by deformation is considered when the CFA is designed. In this paper, in order to analyze the structural vibration of the CFA for automobiles, a finite element model of the CFA is established by using a commercial FEM code. After the finite element modeling, the natural frequencies and the mode shapes are obtained from the FE analysis. The natural frequencies are obtained from the vibration test as well. Then, the results of the vibration test are compared with those of the FE analysis. The natural frequencies obtained by experiment have a great similarity to the results from FE model. We have confirmed the validity of the FE model and verify the structural safety for the resonance. The stress and displacements are obtained from FE analysis. We have confirmed the safety for the interference and failure.
CFD analysis를 이용한 Fuel filling pipe-line 설계
이규익(Kyuik Lee),송봉하(Bongha Song),하종백(Jonpaek Ha) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
When filling the gas tank, the gas dispenser is shut off long before the tank is filled. It’s called PSO(Premature Shut-Off). Generally, this problem occurs when the filler pipe from the nozzle to the gas tank fills up with fuel and operates a sensor located on the pump nozzle. A sharp bend in the pipe causes the fuel rushing into the inlet to accumulate at the top of the pipe rather than move directly into the gas tank. When the fuel swirls around in the pipe, it creates a blockage, causing fluid to back up in the filler pipe. The nozzle of the fuel pump has a sensor that turns the pump off as soon as it is surrounded by liquid. This simulations are for the fuel to travel from the fuel inlet to the gas tank while avoiding obstacles along the way. This paper is mainly purposed to avoid this phenomenon through the optimized pipe design by using CFD analysis. As a result, the simulations indicate that CFD can be successfully utilized as a tool to shorten the design, development and cost reduction cycle of a nozzle, filler pipe, canister, and tank system.