http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
육지용(Yook, Ji-Yong),차용길(Cha, Yong-Kil),임정수(Lim, Jung-Su),김광일(Kim, Kwang-Il),강성호(Kang, Sung-Ho) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.1
This paper presents dynamic analysis of HVAC(heating ventilation & air conditioning) heater case which consists of heater and evaporator unit for passenger car. To analyze the dynamic characteristics of HVAC heater case, finite element model which consists of shell elements is constructed for modal analysis and experimental modal analysis has been conducted. Finite element analysis results are compared with experimental results to evaluate of validity of finite element model. After identifying mode shape and natural frequency of HVAC heater case, local stiffness of HVAC case is evaluated through point mobility using finite element analysis and experiment.
구자군,양휘주,차용길,유상석 한국자동차공학회 2022 International journal of automotive technology Vol.23 No.6
In designing the heat exchanger model, the existing epsilon-number of transfer units (NTU) method cannot reflect factors inside the heat exchanger, such as the local flow rate changes. Furthermore, it is difficult to apply a three-dimensional model to a one-dimensional analysis since high computational power is required. In contrast, a pseudo-three-dimensional heat exchanger model which has higher accuracy than the existing epsilon-NTU method and has faster speed for application in one-dimensional analysis. However, pseudo-three-dimensional model has still improvements in the simulation time as the mesh counts increase. In this study, the improved pseudo-three-dimensional heat exchanger model was developed and integrated within a one-dimensional analysis loop capable of simulating vehicle driving and the cooling system. The integrated model calculated the change in the energy consumption of the entire cooling system with the change in the aspect ratio of the heat exchanger. Also, the optimal operation strategy of the cooling system, which incorporated a proportional integral derivative controller of the three-way valve, was determined to reduce the parasitic losses. As a result, parasitic loss of the cooling system decreased by 14.1 % as aspect ratio increased by 46 % under FTP-72 (UDDS) driving schedule and simulation time was reduced 90.1 % while accuracy degrades only 2.7 %.
육지용(Jiyong Yook),차용길(Yongkil Cha),양현섭(Hyunsub Yang),조경석(Kyungsuk Cho),백찬호(Chanho Beak),김광일(Kwangil Kim) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Hybrid and electric vehicles adopt electric motor driven system using rechargeable battery compared to conventional vehicles. These vehicles are eco- friendly les because of no fuel consumption. These chargeable vehicles using alternative power train driven by electric motor need high efficient thermal management system in battery system in high temperature status on going charging and discharging operation . To maintain proper temperature status in battery system, BCS(Battery Cooling System) is adopted. BCS is composed of BLDC motor, inverter, sirocco type wheel and BLWR. Unit and the operating noise of BCS located under the trunk makes NVH problem in vehicle. In this paper, FEA(Finite Element Analysis) and experiment are performed for analyzing NVH characteristics of BCS , verify the noise source of BCS and propose the noise reduced design for BCS NVH problem.
육지용(Jiyong Yook),차용길(Yongkil Cha),양현섭(Hyunsub Yang),조경석(Kyungsuk Cho),백찬호(Chanho Beak),김광일(Kwangil Kim) 한국자동차공학회 2012 한국자동차공학회 지부 학술대회 논문집 Vol.2012 No.10
Hybrid and electric vehicles adopt electric motor driven system using rechargeable battery compared to conventional vehicles. These vehicles are eco- friendly les because of no fuel consumption. These chargeable vehicles using alternative power train driven by electric motor need high efficient thermal management system in battery system in high temperature status on going charging and discharging operation . To maintain proper temperature status in battery system, BCS(Battery Cooling System) is adopted. BCS is composed of BLDC motor, inverter, sirocco type wheel and BLWR. Unit and the operating noise of BCS located under the trunk makes NVH problem in vehicle. In this paper, FEA(Finite Element Analysis) and experiment are performed for analyzing NVH characteristics of BCS , verify the noise source of BCS and propose the noise reduced design for BCS NVH problem.
반복 열하중을 받는 자동차용 열교환기의 열적 거동 특성에 관한 실험적 연구
송필곤(Pilgon Song),배성민(Seongmin Pae),차용길(Yongkil Cha),김광일(Kwangil Kim),서재성(Jaeseong Seo) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Aluminum brazing heat exchangers can be used at high temperature and pressure conditions. So it has been widely used in automotive engine cooling system with excellent performance. However, it has the potential to cause failure from large thermal loads and it may be give adversely affects to the system at the structural point of view. Therefore analyzing behavior characteristics and failure mode under extreme operating conditions are very important for heat exchanger design and manufacturing. In this paper, dynamic strain is measured at the predicted points of failure using electric resistance type strain gage. An infrared thermal imaging camera and thermo-couple sensors are used to measure gradient and changing of temperature as time goes by. Therefore, material behavior characteristics at the point of failure are analyzed from measured strain and temperatures during the thermal cycle test. Furthermore, serge and core-plugging phenomenon that affect the durability is observed.