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정완희(Jeong, Wan-hee),민승식(Min, Seung-sik) 국방부 군사편찬연구소 2014 군사 Vol.- No.92
This paper is about the combat power index(CPI) of two nation’s warships during Japanese invasion of Korea in 1592(so called, Imjin-Waeran broken out the year of Imjin). The calculation model of CPI was utilized by Lanchester. In order to gain the proper input data, historical records of sea battles were classified and the controversial data which contain some abnormal operations and sequential attacks were excluded. After filtering the historical records, 8 kinds of battles are selected. These are the sea battles of “Okpo, Happo, Jeokjinpo, Sacheon, Dangpo, Danghangpo, Hansando, and Angolpo”. The initial and the final numbers of ships for the 8 sea battles were applied into the Lanchester’s model. Then, the CPIs of Japanese small, middle, and large warships are deduced to 16.1, 14.0, and 7.9, respectively. This means that 1 Korean warship(so called, Panoksun) was corresponded to 16.1, 14.0, and 7.9 Japanese small, middle, and large warships, respectively. Because the CPI of Korean warship was larger than that of Japanese warships, the Korean navy could overwhelm the Japanese navy during Imjin-Waeran.
실시간 다물체 차량 동역학을 위한 안티 롤 바 모델 개발
정완희(Wan Hee Jeong),김성수(Sung-Soo Kim),하경남(Kyung Nam Ha) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Anti roll bar model for real time multibody vehicle dynamics model has been proposed using kinematic constraint. Anti roll bar have been modeled by kinematic relationship, and mass properties are neglected. Relative angle of torsion bar spring is computed by constraint about drop-link using Newton-Raphson iteration, and then the torque of torsion bar spring can be computed with the angle and torsion spring stiffness. Finally anti roll bar force acting on both knuckle can be calculated. To validate the proposed method, half car simulations of McPherson strut suspension and full car bump run simulations are also carried out comparing with the ADAMS vehicle model with anti roll bar. CPU times are also measured to see the real-time capabilities of the proposed method.
실시간 다물체 차량 해석을 위한 준정적법의 컴플라이언스 효과 모델링
정완희(Wan Hee Jeong),하경남(Kyoung Nam Ha),김성수(Sung-Soo Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Compliance effect consideration method for real-time multibody vehicle dynamics is proposed using quasi-static analysis. The multibody vehicle model without bush elements is used based on the subsystem synthesis method which provides real-time computation on the multibody vehicle model. Reaction forces are computed in the suspension subsystem. According to deformation from the quasi-static analysis using reaction forces and bush stiffness, suspension hardpoint locations and suspension linkage orientation are changed. To validate the proposed method, quarter car simulations of McPherson strut and multilink suspension subsystems. Full car bump run simulations are also carried out comparing with the ADAMS vehicle model with bush elements. CPU times are also measured to see the real-time capabilities of the proposed method.
정완희(Jeong, wan-hee),민승식(Min, seung-sik) 국방부 군사편찬연구소 2014 군사 Vol.- No.91
This study is on the analysis of the physical combat strength for the sea battle of ‘Chilchunlyang’ and ‘Myunglyang’ occurred between Chosun and Japan naval forces in Jung-Yu-Jaeran(1597). We used the OODA (Observe, Orient, Decision, Act) theory and the Lancester’s law for the analysis of the physical combat power, and then figured out the accomplished battle power from original physical combat power through OODA theory. Also, we estimated the results of these two sea battles through the Lanchester’s law by applying the accomplished battle power of two naval forces to the operational circumstances. Considering the analysis of the sea battle of ‘Chilchunlyang’, the main reason for the Chosun navy’s defeat was because it did not demonstrate its combat power in an effective way. However, during the ‘Myunglyang’ sea fight, both Chosun and Japan naval forces displayed their own battle power. In this combat, the Chosun naval forces estimated to be get the victory through the analysis of Lanchester’s law. On the other hand, this analysis may offer a basis to presume the spot of the engagement for the naval battle of ‘Myunglyang’. Moreover, the Chosun navy’s overwhelming victory was estimated from the Lanchester’s law assuming that the OODA was sufficiently satisfied by the stages when the conditions were set. Considering the analysis of these two sea battles, we can draw a inference that the reason for Chosun navy’s losing the ‘Chilchunlyang’ sea fight caused by the failure of security operations. In a sense, it is expected to lay the ground work to estimate the aspect of the past battle and the result of future warfare that possibly happen by analyzing the physical combat power.
실시간 차량 동역학 해석을 위한 안티 롤 바 힘 계산 알고리듬
김성수(Sung-Soo Kim),정완희(Wan Hee Jeong),하경남(Kyoungnam Ha) 대한기계학회 2008 大韓機械學會論文集A Vol.32 No.2
Anti roll bar model for real time multibody vehicle dynamics model has been proposed using kinematic constraint. Anti roll bar have been modeled by kinematic relationship, and mass properties are neglected. Relative angle of torsion bar spring is computed by constraint about drop-link using Newton-Raphson iteration, and then the torque of torsion bar spring can be computed with the angle and torsion spring stiffness. Finally anti roll bar force acting on both knuckle can be calculated. To validate the proposed method, half car simulations of McPherson strut suspension and full car simulations are also carried out comparing with the ADAMS vehicle model with anti roll bar. CPU times are also measured to see the real-time capabilities of the proposed method.
실시간 다물체 차량 동역학 모델을 이용한 ESC Hardware-in-the-loop 시뮬레이션
김성수(Sung-Soo Kim),정완희(Wan Hee Jeong),정도현(Do Hyun Jung),최형진(Hyoung Jin Choi) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Intelligent vehicle consists of several control systems such as ESC (Electric Stability Control), CDC (Continuous Damping Control), etc. To develop such control subsystems, extensive vehicle tests are necessary to evaluate control subsystems. To reduce the number of vehicle tests, which are mostly time consuming and costy, HILS (Hardware-In-the-Loop Simulation) is necessary. In the HIL-simulaor, the software vehicle dynamics model must be solved in real-time, and it must also reproduce real vehicle motions. In order to carry out real-time simulation, real-time multibody vehicle dynamics model has been developed using subsystem synthesis method. In this paper, the real-time multibody vehicle dynamics model has applied into the HIL-simulator constructed in KATECH (Korea Automotive Technology Institute). Performance evaluations of intelligent chassis controller such as ESC have been carried out. Fish-hook test simulations have been carried out to see the performance of the intelligent chassis controller.
실시간 다물체 차량 해석을 위한 준정적법의 컴플라이언스 효과 모델링
김성수(Sung-Soo Kim),정완희(Wan Hee Jeong),하경남(Kyoungnam Ha) 대한기계학회 2008 大韓機械學會論文集A Vol.32 No.2
Compliance effect consideration method for real-time multibody vehicle dynamics is proposed using quasi-static analysis. The multibody vehicle model without bush elements is used based on the subsystem synthesis method which provides real-time computation on the multibody vehicle model. Reaction forces are computed in the suspension subsystem. According to deformation from the quasi-static analysis using reaction forces and bush stiffness, suspension hardpoint locations and suspension linkage orientation are changed. To validate the proposed method, quarter car simulations of McPherson strut and multilink suspension subsystems are performed. Full car bump run simulations and fish hook handling test simulations are also carried out comparing with the ADAMS vehicle model with bush elements. CPU times are also measured to see the real-time capabilities of the proposed method.