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가속시험을 통한 불규칙하중을 받는 실구조물의 피로수명평가
김형익(H. I. Kim),배봉국(B. K. Bae),박재실(J. S. Park),석창성(C. S. Seok),모진용(J. Y. Mo) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
A fatigue test was used to evaluate the fatigue life of an actual structure. The loaded state and the constraint condition of an actual structure must be same as the specimen in order to apply the test results to an actual structure by the specimen. The loaded state and constraint conditions can"t be same as the specimen in the actual structure which is complicated. In order to reduce these differences, an actual structure test with a lot of frequencies is need to get a fatigue life curve. Therefore, ten sets of accelerated test units which attached unbalanced mass were composed in this study. Acceleration history about the vibration of an actual structure was acquired. Rainflow counting was used on acceleration history, and the life curve return formula was assumed. The return formula that damage satisfied `1" was acquired in a feedback process by the Miner"s rule, which was the linear cumulative damage theory. A conservative fatigue life curve was determined with a return formula to have been presumed by each set. The fatigue life of regular rpm condition was calculated by these conservative fatigue life curves.
실시간 ABS 시뮬레이션을 위한 차륜속도 시뮬레이터의 개발
김석민(S.M.Kim),배봉국(B.K.Bae),정재현(J.H.Chung),서명원(M.W.Suh),석창성(C.S.Seok),김영진(Y.J.Kim),이재천(J.C.Lee),김성봉(S.B.Kim),이선일(S.I.Lee),김장성(J.S.Kim) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_2
In order to perform a vehicle driving simulation test in laboratory for the electronic control unit(ECU) analysis of anti-lock brake system(ABS), it is necessary to simulate the wheel speed signal which is to be controlled for the various road and driving conditions. The speed signal from the real wheel speed sensor is not only for the speed calculation but also for the diagnosis of the ABS system. In this research, wheel speed simulator is developed which can generate the equivalent signal as that of a real wheel speed sensor. The applicability of the wheel speed simulator is validated by the simulation tests using commercial ECU of ABS. The wheel speed simulator is based on the personal computer so that it can be applied to other vehicle tests involving vehicle speed and/or wheel speed.<br/>
김석민(S.M.Kim),배봉국(B.K.Bae),정재현(J.H.Chung),서명원(M.W.Suh),석창성(C.S.Seok),김영진(Y.J.Kim),이재천(J.C.Lee),김성봉(S.B.Kim),이선일(S.I.Lee),김장성(J.S.kim) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_2
The prevalence of microprocessor-based controllers in automotive systems has greatly increased the need for tools which can be used to validate and test control systems over their full time range of operation. The objective of this paper is to develope the real time simulator of anti-lock braking system using hardware-in-the-loop simulationbased on a personal computer. By use of this simulator, the analyses of commercial electronic control unit as well as the validation of the developed control logics for ABS were performed successfully. The simulator of this research can be applied to development of more advanced control system, such as traction control cystem,vehicle dynamic control system and etc.<br/>
허용(Y. Huh),김형익(H. I. Kim),배봉국(B. K. Bae),석창성(C. S. Seok) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
The limited slip differential(LSD) is a device which enables the driving force to be transmitted from one slipping wheel to another wheel in such case that the car is stuck in clay or snow. When the unwanted slipping occurs on one wheel, the LSD temporarily restraints the differential motion to transmit the driving force in the other wheel. So far, many types of LSD were developed such as mechanical lock type, disk clutch type, viscous coupling type, torsion type and multiple clutch type. However these types of LSD is too complicated and expensive, so it is used only for 4WD outdoor vehicles, military vehicles, and a portion of deluxe car. So, many studies has been devoted to improve new types of LSD to cover those demerits of existing LSDs that the hydraulic LSD is developed as arepresentative result of that. The hydraulic LSD which uses the principle of gear pump is packed with viscous oil in tight container. When a slip occurs on one wheel, the hydraulic LSD generates torque caused by high oil pressure in the container. This study has been devoted to suggest an improved hydraulic LSD. In order to achieve it, we designed a new type of hydraulic LSD, produced it and did a rig test with it on real vehicle. From the rig test, it has been confirmed that the new type of hydraulic LSD can be directly applied to exiting vehicles without changing the design criteria.
배봉국,석창성 기계기술연구소 2000 성균관대학교 논문집 기계기술편 Vol.2 No.1
The positioner is an essential component of control valve which is used to control quantity of liquid in pipe of chemical plants. In this paper, experimental methodology for I/P (current pneumatic) positioner was developed for the investigation of the step response of characteristics of the positioner. The methodology was applied to two different I/P positioners, which are current model in market and newly designed model. The usefulness of the methodology was confirmed by example cases.