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다구찌 방법을 이용한 하이브리드 차량의 SOC 유지전략 최적화
김현일(Hyunil Kim),전순일(Soonil Jeon),박영일(Yeong-il Park),이장무(Jang-moo Lee) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
We present new structure of SOC sustaining strategy for a charge sustaining hybrid electric vehicle (HEY), which can reflect the strategies for a mild HEV(Honda Insight) and a normal HEV(Toyota Prius). The proposed SOC sustaining strategy is composed of two steps to prevent over-charging or depleting of electric energy storage device such as NiMH. For this purpose, six SOC limits characterizing the SOC sustaining strategy are optimized through analysis of means (ANOM) in Taguchi's method. Besides, their relative effects on fuel economy are evaluated based on analysis of variance (ANOVA)
요소 연결성을 고려한 Non-Intrusive 비선형 축소 기법 : Ⅱ. 다물체 동역학에의 적용
김현일(Hyunil Kim),김의영(Euiyoung Kim),조맹효(Maenghyo Cho) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
The study of flexible multibody dynamics has been actively conducted since 1970’s. There are two representative coordinate systems in the flexible multibody dynamics. One is Floating Frame Reference Formulation(FFRF) and the other is Absolute Nodal Coordinate Formulation(ANCF). FFRF uses the local coordinate, which makes gyroscopic and Coriolis forces appear. These forces disappear on the latter formulation since ANCF is developed based on the global coordinate system. Therefore, reduced order modelling methods developed for the standard static nonlinear transient analysis can be utilized to flexible multibody dynamics if ANCF is used. A non-intrusive reduced order modelling technique is one of the reduction methods for nonlinear transient response analysis. The technique uses the polynomial formulation to describe the nonlinear internal force terms. In this work, the non-intrusive method is applied to ANCFbased multibody dynamics to solve design optimization problems.
다이나믹 프로그램밍을 이용한 HEV 의 최적 연비 비교
김현일(Hyunil Kim),공진형(Jin-hyung Kong),임원식(wonsic Lim),이장무(Jang-moo Lee) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Dynamic Programming is one of the global optimization techniques used to develop optimal control strategies for HEVs. In this paper, we applied dynamic programming in deriving the maximum possible fuel economies of three types of vehicles, a diesel HEV. Honda Insight and Toyota Prius. The results from the optimizations were validated with the histories of control variables and the operating points of the power sources. We compared fuel economies from the optimizations with those from other researches.<br/>
가상 환경 주행 시뮬레이션을 위한 CarMaker 기반 차량모델 개발과 정합성 평가에 대한 연구
김현일(Hyunil Kim),정현욱(Hyeonwook Jung),진병옥(Byeongok Jin),조준희(Junhee Jo),이지호(Jeeho Lee),이태희(Tae Hee Lee) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
In this study, we developed full vehicle model for vehicle dynamics simulation based on IPG CarMaker. Suspension components(spring and damper) characteristics test data apply using hydraulic actuator. Vehicle model K&C(Kinematic & Compliance) characteristics data apply using SPMD(Suspension Parameter Measurement Device). Vehicle handling dynamics test data measurement get using vehicle CAN, GPS/INS, WFT(Wheel Force Transducers). Finally, we compare developed virtual model simulation and vehicle handling dynamics test for model correlation analysis.
RLD 기반 타이어 연계 쿼터 서스펜션 모듈 특성에 관한 연구
김현일(Hyunil Kim),유덕현(Duckhyun Yu),진병옥(Byungok Jin),김기환(Gihwan Kim),이태희(Taehee Lee) 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6
The development process of a modern car suspension system consider the target value of the suspension parts characteristics according to purpose of vehicle development. It apply to the design by referring to the benchmark data of the competition vehicle segment and the existing development DB(database). However, it is difficult to predict the actual characteristics of the suspension, so it is necessary to tuning the characteristics of the suspension parts and the specifications of the tires through vehicle tests. A variety of test methods are used for quantitative evaluation, because suspension test is almost subjective test. In this Study, we produce a road test condition by reproducing displacement and load based on RLD measured by vehicle test, and propose a characteristic test method of Tire Coupled Quarter Suspension Module.
김현일(Kim Hyunil) 세계환단학회 2015 세계환단학회지 Vol.2 No.2
아틸라 사후 훈 제국이 붕괴하였다는 것은 부인할 수 없는 사실이다. 그러나 여러 집단으로 분열되었지만 훈족은 결코 역사의 무대에서 사라진 것은 아니었다. 6, 7세기의 비잔틴 사서들에서는 쿠트리구르와 우티구르 훈족이 위협적인 정치·군사적 세력으로 빈번하게 언급되고 있다. 이 두 훈족 집단은 460년대 이후 남러시아 초원지대로 이주해온 또 다른 아시아 유목민족인 오구르 족과 연합하였다. 불가르 족은 이러한 연합으로부터 생겨났다. 560년대에는 불가르 연합의 모든 부족들이 아바르 족에 의해 정복되었다. 그러나 630년대에 쿠브라트는 훈족 (아마도 쿠트리구르 부족)의 지도자로서 아바르 족과 싸워 대불가리아를 건국하였다. 그의 아들 아스파루크는 680년 다뉴브 하류 지역에서 또 다른 불가리아를 세웠다. 「불가리아 칸 명부」에는 그와 그의 부친 쿠브라트를 아틸라의 후손으로 기록하였다. 그래서 우리는 불가리아 제국은 아틸라 시대 훈제국의 부활이라고 주장할 수 있을 것이다. 그 지배 엘리트는 자신들을 아틸라 훈족의 계승자로 여겼던 것 같다. 우리는 9세기 말의 헝가리 정복자들에게서도 비슷한 의식을 찾아 볼 수 있다. 헝가리 정복자들은 불가르 연합에 참여하였던 또 다른 오구르 부족인 온오구르 부족에서 나왔다. 훈족은 군사 엘리트로서 중세 초 불가리아와 헝가리 건국에서도 여전히 중요한 역할을 하였다. It is undeniable that the Hun Empire disintegrated after Attila’s death. Even though dispersed in several groups, the Huns never disappeared from the stage of history. The Kutrigurs and Utigurs Huns were mentioned frequently in the 6th-7th century Byzantine chronicles as menacing politico-military forces. These two Hun groups made alliance with Oghur tribes, another steppe people from Central Asia who migrated into the south Russian steppe after 460s. Bulgars came from this alliance. In the 560s all the tribes of the Bulgar confederacy were conquered by the Avars. But in the 630s Kubrat fought against Avars and founded the Great Bulgaria as a Hun (maybe Kutrigur) leader. His son Asparukh founded another Bulgaria in the region of Lower Danube in 680. Nominalia of the Bulgarian khans listed him and his father Kubrat as descendants of Attila. So we can argue that the Bulgarian empire was a resurrection of the Hun Empire of the Attila age. The ruling elite might have considered itself as successors of the Attila Huns. We can also find similar consciousness in the Hungarian conquerors of the late ninth century. They came from the Onoghur tribes, another Oguhr people who had participated in the Bulgar confederacy. So the Huns continued to play a significant role as military elites in the foundation of Bulgaria and Hungary in the early Middle Ages.