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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 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.
근사다항식을 이용한 다물체 차량동역학 모델 개발 및 실시간성 검증
정완희(Wanhee Jeong),김성수(Sung-Soo Kim),이선호(Sunho Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
An approximate function approach has been developed using the subsystem synthesis method for real-time multibody vehicle dynamics models. In this approach, instead of solving loop closure constraint equations of the suspension linkage, approximate functions are used. The approximate function represents the functional relationship between dependent coordinates and independent coordinates of the suspension subsystem. This kinematic relationship is also included in the suspension subsystem equations of motion. Different order of polynomial functions are tried to find out the best candidate functions. The proposed method is also compared with generalized coordinate partitioning method and constraint stabilization method to verify its accuracy and efficiency in real-time.
준정적 방법을 이용한 실시간 다물체 차량 동역학 모델의 컴플아이언스 효과 적용
정완희(Wanhee Jeong),김성수(Sung-Soo Kim),황기상(Ki Sang Hwang) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Compliance effect for real time multi-body vehicle dynamics model has been considered using quasi-static analysis method. In this method, hard point locations of the suspension subsystem are changed according to the deformation of bush due to joint reaction force. Real time multi-body vehicle model is established using the subsystem synthesis method which is based on recursive formulation. Joint reaction forces are computed by using non-recursive formulation. The proposed method has been validated with 1/4 car simulation of multilink suspension model by comparing with ADAMS compliance model. The proposed method increase very little computation amounts. Thus, it is well suited for real time model.
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 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.