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이육형,송준호,류춘회 울산과학대학 2002 연구논문집 Vol.28 No.2
본 연구를 ERF를 이용한 현가장치의 스카이훅 제어에 관한 연구이다. ER유체는 전기장의 세기에 따라 겉보기 점도가 변화한다. ER유체를 이용한 시스템은 전자신호 사이에서 유압의 이동 없이 직접 가능하게 한다. 본 논문은 1/4 자동차의 ER댐퍼를 이용한 2자유도 모델을 다룬다. 반능동 현가장치의 제어법칙으로 수동, 스카이훅, 최적제어, ANFIS 지능제어 방법을 이용한 것이다. 컴퓨터 실험결과는 ERF댐퍼를 적용한 반능동 현가장치의 좋은 성능을 보여준다. In this paper, skyhook control of a suspension using ERF is investigated. Electro-rheological fluids change their apparent viscosity according to the electric field strength. Using ER Fluids, it is possible to directly interface between electric signals and fluid power without moving parts. This paper deals with a two-degree-of-freedom suspension using the ER damper for a quarter car model. The control law for semi-active suspensions modeled in this study is developed using passive, skyhook, LQR and ANFIS control method. Computer simulation results show that the simi-active suspension with ERF damper has good performance.
이육형,송준호 한국기계가공학회 2006 한국기계가공학회지 Vol.5 No.3
The objective of this paper is to investigate the Intelligence control characteristics of a digital damper. This paper deals with a two-degree-of-freedom suspension using the damper with ER fluid for a quarter vehicle system. The control law for semi-active suspensions modeled in this study is developed using passive and ANFIS control method. Computer simulation results show that the semi-active suspension with ER damper has good performances of ride quality.
배플수에 따른 원통다관형 열교환기 성능에 관한 실험 적 연구
이육형,김순영,박명관,Lee, Yuk-Hyeong,Kim, Sun-Yeong,Park, Myeong-Gwan 대한기계학회 2001 大韓機械學會論文集B Vol.25 No.12
The shell and tube heat exchangers were introduced to apply to a big capacity condenser and a high pressure feed water heater for power plant in the beginning of 1990s. Design and manufacturing technology fur shell and tube heat exchangers have been developed until now. But it is very difficult to calculate the expected performance characteristics of the shell and tube heat exchanger, because there are many design parameters to be considered according to internal structure and the shell side heat transfer mechanism complicately related to the design parameters. Design parameters to be considered in the design stage of shell and tube heat exchanger are shell and tube side fluids, flow rate, inlet and outlet temperature, physical properties, type of heat exchanger, outer diameter, thickness, length of tube, tube arrangement, tube pitch, permissive pressure loss on both sides, type of baffle plate, baffle cutting ratio. The propose of study is an analysis TEMA(Tubular Exchanger Manufacturers Association) E shell and tube heat exchanger performance with changing a number of baffles(3, 5, 7, 9, 11) and tubes(16, 20) and determined optimal baffle spacing.
[차량운동성능] 차량용 반능동 ER댐퍼의 스카이훅 제어
이육형(Yuk Hyung Lee),박명관(Myeong Kwan Park) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_2
In this paper, skyhook control of a semi-active ER(Electro-Rheological) damper for vehicles is investigated. The strength of the ER damper is controlled by a high voltage power supply. This paper deals with a two-degree-of-freedom suspension using the damper with ERF for a quarter vehicle system. The control law for semi-active suspensions modeled in this study is developed using skyhook and Linear Quadratic Regulator(LQR) optimal control method. Computer simulation and experimental results show that the semi-active suspension with ERF damper has good performances of ride quality.
이육형(Yuk-Hyung Lee) 한국기계가공학회 2010 한국기계가공학회지 Vol.9 No.1
A new flow mode of ER fluid available for controlling the damping force by using DME(Discrete Multi-Electrode) is presented in this study. Various characteristics about the flow of ER fluid through the experiment of ER cluster behavior visualization can be assumed. The pressure in electrode length and voltage division mode is measured. An actuator with a damping effect through DME ER damper will be developed. This damper controls the damping force by using the displacement and velocity of the plant which consists of the various electrode length and voltage modes without a controller in the real system.