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정백기 陸軍士官學校 1996 한국군사학논집 Vol.51 No.-
The dynamic model was derived for analyzing the characteristic of small arms and its component. The dynamic behavior of motion was presented in terms of displacement, velocity, and acceleration. For the purpose of declining the vertical jump at the muzzle, the shape of flash suppressor was investigated. For the analysis of ballictic trajectory of small arms, interior ballistic trajectory, and drag coefficient of bullets were derived. The exterior ballistic trajectory of K-2 and M16A1 were calculated and represented in terms of range.
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정백기 陸軍士官學校 1999 한국군사학논집 Vol.55 No.-
In this paper the kinematic analysis for a serial/parallel type of a robot manipulator was studied. For a serial robot manipulator, setting a coordinate system, deriving a transformation matrix and a jacobian matrix were accomplished step. by step. For a parallel manipulator a pantograph type manipulator was selected. The results of this research can be summarized as following: 1)The process for a kinematic analysis was accomplished in terms of setting a coordinate system, deriving a transformation matrix and a jacobian matrix. 2) The feasibility of kinematic solution was evaluated in term of positioning an actuator. 3) The mathematical model of a pantograph type manipulator was derived.
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정백기,정준환 陸軍士官學校 1996 한국군사학논집 Vol.51 No.-
This paper presents an algorithm to solve the inverse dynamics for Stewart platform type of flight simulator using Newton-Euler method. The inverse dynamics of the system is governed by thirty-six linear equations. The number of these simultaneous equations can be reduced to six, if a proper sequence is taken. The relationship between the actuating forces and the shape of the structure are analyzed. Based on the algorithm, computer code for simulation was developed. It is found that the fluctuation of the driving forces is less when the path is closer to the center of the base.
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강내탄도 신호처리용 하드웨어 및 소프트웨어의 구성에 관한 연구
정백기,정동윤 陸軍士官學校 1994 한국군사학논집 Vol.47 No.-
In this paper architectures of hardware/software for an interior ballistic signal processing have been developed. The software followed by modeling an instrumentation for an interior ballistic data of M16A1 rifle interfaces the hardware between sensors and a signal processor. The software shows that pressure of propelling gas, and velocity of the bullet in the barrel can be presented in terms of barrel distance from chamber to muzzle. the system for instrumentation of pressure works well in the multi-channel. the process of measuring the temperature and stress for the barrel remains for a future work.
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정백기,김인우 陸軍士官學校 1993 한국군사학논집 Vol.44 No.-
This paper presents a method of dynamic analysis for small-arms for the purpose of increasing the ballistic performance and supplying the desing parameters. The method is illustrated by analyzing a M16A1 rifle. Considering the cycle-operation of the conventional small-arms, a dynamic model can be derived for the four components: bolt, bolt carrier, hammer, and main gun. The dynamic model allows the derivation of the equation fo motion based on the Newton's 2nd law of motion for each component. The external forces applied to the system component are contact forces between the components, and propellant gas pressure. The numerical method, Runge-Kutta algorithm, is used in analyzing the mathematical model. The result represented in terms of displacement, velocity, and acceleration of each component may be utilized to improve the ballistic performance and to supply the fundamental design parameters.
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정백기 陸軍士官學校 1994 한국군사학논집 Vol.47 No.-
The muzzle rising force was determined from the torque acting on the rifle due to a recoil force. For the purpose of declining a muzzle rising, the gas flowing through the M16A1 flash suppressor was considered. The mathematically derived model could be analyzed using a Small Arms Simulation code, which is based on the finite difference approximation technique. A procedure for deriving a counter-rising force at the flash suppressor was investigated. A flash suppressor, improved in reducing a muzzle rising, was modeled and tested. The experiment shows that muzzle rising has quantitative relation to shape of a flash suppressor, and can be reduced by the improved modeling of a flash suppressor.
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이종원,김영탁,홍창배,안영명,정백기 중앙대학교 생산공학연구소 1995 생산공학연구소 논문집 Vol.4 No.2
한정된 공간내에서 대중량물을 취급하는 분야는 로봇의 활약이 기대되는 분야중의 하나로써 전용로봇의 개발이 요구된다. Lee등은 한정된 공간내에서 작은 설치공간을 차지하면서 설치공간에 비해 활동영역은 크고 대중량물을 효율적으로 취급할 수 있는 로봇의 기구로써 팬터그래프기구를 제안하였으며 여러가지 기구학적인 해석을 통하여 바람직한 액튜에이터의 배치방법 및 설계방법을 제시한 바 있다. 해석의 과정에서 종래의 Denavit-Hartenberg Notation에 의한 좌표계의 설정방법으로는 기구학적인 모델링이 매우 복잡하여짐을 지적하였다. 본 연구에서는 로봇아암의 기구로써 응용된 팬터그래프가 산업로봇에서 많이 채용되는 평면 2자유도 병렬링크로 기하학적 등가변환이 가능함을 보인다. 또한 이 기구를 이용한 5자유도 로봇 아암의 설계에 대하여 기술한다. The robot, which operates in a ristricted space and handles a heavy load, is requested at an industry. Lee[2] suggested a pantograph mechanism for a robot occupying a small foundation space, however taking a sufficient work space and handling a heavy load in a ristricted space. He has also shown the optimum arrangement of actuators and design method through the kinematics analysis. He has pointed out that the kinematics modeling is very complicated using the conventional method. Denavit-Hartenverg notation. In this study, the equivalent geometry transformation of the pantograph mechanism to the plannar two d.o.f. parallel driven manipulator are shown. The above result means that the conventional mechanism analyses technique for parallel linkages could be used for the pantograph mechanism. In this study, design concept of 5 d.o.f. robot arm with pantograph mechanism is also described.
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