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조경석(Kyungseok Cho) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The Wave Fan was developed for the past 10 years. In the developing procedures, many leading edge technologies were adapted such as Aeroacoustic analogy prediction, surface pressure measurements, Computational Fluid Dynamics and Laser Doppler Velocitimeter. The Wave Fan is well known because of its unique design. Now the Wave Fan becomes a best in class automotive part in the world and becomes a name of the lower noise fan. But for the specific vehicle application, it needs some modification and optimizations for the best of the system performance. In this paper we can discuss the surface response method to meet customer requirement and to optimize system performance. The uneven blade spacing technique is also applied to minimize the unpleasant discrete tonal noise.
하이브리드 자동차의 고전압 전동압축기용 IPMSM의 최적화 설계 및 평가
조성국(Seongkook Cho),정경훈(Kyunghun Jung),조경석(Kyungseok Cho),박창호(Changho Park) 한국자동차공학회 2012 한국자동차공학회 지부 학술대회 논문집 Vol.2012 No.10
Automobile industry is a technology-intensive industry which has to develop new product rapidly to comply with the demands of consumers. Recently the importance of motor driven electrical compressor is increased dramatically as hybrid car became more popular for the fuel economy. In this paper, high efficiency IPM type BLDC motor development of the high voltage electric compressor for hybrid car is presented. Firstly optimal design of the motor has been conducted. Taguchi method was used to find optimal solution for motor efficiency and cogging torque. Output power, torque-ripple, cogging-torque were considered in optimization process. Secondly, Response surface method(RSM) was used to find optimal level of design factor among motor efficiency, speed range and cogging torque. Finally designed motor has been made and the validity of design process is verified through the comparison between simulation results and experimental ones.
이정한(Jeonghan Lee),조경석(Kyungseok Cho),선효성(Hyosung Sun),신형기(Hyungki Shin),이수갑(Soogab Lee) 한국유체기계학회 1998 유체기계 연구개발 발표회 논문집 Vol.- No.-
Aerodynamic noise generated by automobile cooling fan is investigated. Automobile cooling fans radiate both discrete frequency noise as well as broadband noise. In the present work, the former is considered through free-wake panel method coupled with acoustic analogy fully considering the retarded time variation on the blade surface, while the latter is taken into account by three well-established broadband noise components. Experiments were performed to supplement necessary inputs as well as to provide the final comparison with the predicted noise spectrum. The predicted noise levels at blade passing frequencies agree well with the experimental data for the first few harmonics. Although the predicted broadband noise levels at higher frequencies fall below the experimental data due to the fundamental shortcomings of the utilized formulations, the analysis offers a detailed physical understanding of the fan noise generation processes.
정경훈(Kyunghun Jung),조성국(Seongkook Cho),조경석(Kyungseok Cho),박창호(Changho Park) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
As key industry, the automobile industry is a technology-intensive industry developing rapidly to comply with the demands of consumer. In this paper, the motor development of high voltage electric compressor for hybrid car is presented. In the first place, optimal design of the motor has been conducted. In order to find optimal solution, Taguchi method was used and Output power, Torque-Ripple, Cogging-Torque were considered in optimization process. Also, stress simulation was conducted to prevent the problems in mass production. The weight balance was designed and applied to the motor since the high voltage electric compressor has unbalance. Finally, through the comparison between simulation results and experimental ones, the validity of design process is verified.
주원석(Wonseok Joo),권대복(Daebok Kwon),조경석(Kyungseok Cho),박창호(Changho Park) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Fuel Cell Stack generates enormous heats in the electrochemical process. Generally, the fuel cell stack operates well at a temperature around 65℃ which is lower than the internal combustion engine in the PEMFC vehicle. By using the engine cooling simulation program, we found that the minimum heat capacity of the stack cooling module and air-flow of the fan. The minimum airflow would be 7000 CMH for the 35㎾ of the heat from the stack. We had developed high voltage BLDC motor with controller and high efficiency heat exchanger to solve the problem. But, the Noise of stack cooling fan is very higher than that of ICE vehicle. so, it is necessary to reduce the noise of fan for application to vehicle. This study will present the improvement process of the Stack Radiator which increases the heat capacity and reduces the noise of cooling fan. In the first stage of development we conduct computer simulation including structure analysis. We made the prototype of the cooling module through the results of simulation. Then the performance test was conducted. The results of calorimeter test show that the developed cooling module meets the severe requirements reducing the noise of the cooling fan.