• Proceedings of the KIPE Conference
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• 2015.07a
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• pp.133-134
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• 2015

본 논문에서는 유도형 활공 탄약의 방향과 자세 제어를 위한 4축 조종 날개의 위치 제어용 Sensorless BLDC 전동기 구동 시스템을 개발하였다. HILS(Hardware in the loop system)를 이용하여 유도형 탄약의 발사 조건과 비행 환경을 시뮬레이션하면서 비행 시 발생하는 공력 부하를 기구부로 재현하였고 이러한 조건하에서 4축 조종 날개의 위치 제어 특성을 확인함으로써 개발된 구동 시스템의 성능을 검증하였다.

• The Journal of the Korea institute of electronic communication sciences
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• v.19 no.1
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• pp.181-188
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• 2024

With the development of precision facility technology, the importance of four-axis CNC precision processing technology is increasing. However, due to complex shape processing, it is difficult to operate the system. This paper compared precision control and efficiency by manufacturing a four-axis control structure to solve this problem and implementing Bresenham's Line Algorithm and Runspeed Algorithm without using commercial programs. When Runspeed was applied, there was an error improvement of about 12.03% and curvature accuracy improvement compared to Bresenham. It was confirmed that precise processing was possible to a three-dimensional structure by driving a rotary shaft A motor.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.17 no.4
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• pp.32-38
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• 2018

In this study, the one-piece propeller shaft composed of carbon/epoxy was designed and manufactured for 4 wheel drive automobiles that can bear the target torsional torque performance of 3.5kN.m. For the CFRP tube, braiding machine was used to weaving carbon fiber and it was formed the braided yarns with the braid angle ${\pm}45^{\circ}$ and axial yarns to improve strength of the lengthwise direction. The final CFRP tube of propeller shaft was evaluated through the torsional torque test. The CFRP propeller shaft satisfied requirement of the target torsional maximum torque of 3.5kN.m. Also, it was found that the one-piece composite propeller shaft with CFRP tube had 30% weight saving effect compared with a two-piece steel propeller shaft.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.23 no.2
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• pp.183-189
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• 2010

This paper deals with the comparison of analysis methodologies by applying both Euler angle and quaternion to observe the kinematical behavior of the universal joint system used as an automotive drive-shaft. At first, conventional approaches are applied to predict a kinematical behavior by introducing only Euler angles into the universal joint system, but turns out to be lack in consistency and reliability of the analysis. Then to overcome this deficiency in numerical analysis a different methodology is proposed by using quaternion in this system. Its corresponding advantage is discussed in terms of kinetic energy, rotational velocity and rotational displacement. The application of quaternions in the numerical experiment is shown to be a more useful and valid way of establishing the ideal analytical model of the universal joint system.

• Journal of the Korean Institute of Gas
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• v.26 no.2
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• pp.21-26
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• 2022

Since the four-wheel drive transmits the driving force to all four wheels, the traction with the road surface increases, thereby increasing the driving force. However, it has the disadvantage of lowering fuel efficiency. Therefore, four-wheel drive is commonly used as a method of converting to optional four-wheel drive when necessary while driving in two-wheel drive. This selective four-wheel drive converts the driving force by mechanically changing the electric signal sent by the driver in the transfer case. In this study, in order to mechanically change the electrical signal, a reducer is applied to the motor to increase the torque to perform the function. Therefore, in this study, a reduction mechanism applicable to the motor inside the transfer case applied to convert the drive is derived, and the reduction ratio applying the planetary gear type is optimized accordingly. And based on the derived reduction ratio, two sets of planetary gears using a ring gear in common were applied to develop a planetary gear tooth type in which the input shaft and output shaft are decelerated in the same phase. Optimization design was carried out.

• Journal of Power System Engineering
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• v.15 no.4
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• pp.65-74
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• 2011

이 논문은 비선형 시스템에 대해 bilinear 강인제어기를 설계하는 새로운 방법을 제시한다. 이 설계방법은 골칫거리인 비선형 영향을 나타내는 무거운 질량을 가지고 진동하는 시스템을 제어하기 위한 새로운 대안이고 진전된 방법이다. 이 설계 과정에, hydrostatic 구동기로 구동되는 킬(용골)이 주어진다. 첫 단계로 킬은 물리적으로 여러 한정된 질량으로 모델화된다. 물리적 모델에 근거한 수학적인 모델을 유도하는 방법은 해밀턴 원리를 적용한 유한요소법을 사용하였다. 즉, 수학적 모델은 여러 서브시스템으로 구성된다. 이것은 주어진 물리적인 시스템에 대해 기준이 되는 시스템이다. 회전하는 구동기에 대한 물리적 모델에 근거하여, 과도 거동은 구동기의 베어링에서 측정되는 운동 현상으로부터 유도된다. 물리적인 시스템은 bilinear 시스템으로 구성하였다. 이 시스템에 근거하여, 요트 킬의 거동을 제어하도록 bilinear 관측기를 설계한다. 구동기의 속도, 토크, 밸브에서의 유량 등이 관측기를 구성하는데 필요한 데이터들이다. 시뮬레이션 결과에 의하면 비선형성에 대한 추정과 보상을 통하여 무거운 질량을 갖는 회전축에 대한 위치와 힘을 제어하는 설계에 유용한 접근법임이 증명되었다.

• Journal of Biosystems Engineering
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• v.21 no.4
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• pp.399-405
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• 1996

In order to maintain a constant speed ratio between the tractor and attached seed planter, a feedback control unit to rotate the feed shaft of the planter in proportional to the ground speed of the tractor was designed. The fifth wheel was used as a ground speed sensor for the unit. Using this control unit a feed shaft driving system was developed and tested to estimate its performance both in laboratory and fields. The test results showed that the system rotates the feed shaft proportionally to the ground speed in the range of the normal planting speed of 0.5-0.8m/s with errors less than 5%.

• Journal of the Institute of Electronics and Information Engineers
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• v.51 no.9
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• pp.238-247
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• 2014

The milking robot system is very important to detect correctly the teats position in the moving condition of cow. Also, the robot manipulator must control tracking the teat cup to the detected teat position. The presented milking robot is designed using the one point laser sensor for teat position detection. The teats of cow are detected by the laser scanning unit and the manipulator has the function of 3 axes moving control unit. The presented teat detection method and the electrical driving manipulator have the advantages of a simple, low cost and very quiet. The designed manipulator is realized by the totally electrical motor and servo poison control algorithm with velocity PID compensation. The presented robot is realized using the teat detection unit, 4 teat cups, 3 axes robot arm, 6 servo motors and automatic milking control line. The designed robot is experimented in the cow farm and is satisfied with the designed performance specification for milking robot manipulator.

• Journal of Drive and Control
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• v.11 no.2
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• pp.9-15
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• 2014

This paper deals with the issue of force synchronizing control for the clamping servomechanism of injection molding machines. Prior to the controller design, a virtual design model has been developed for the clamping mechanism with hydraulic systems. Then, a synchronizing controller is designed and combined with an adaptive feedforward control in order to accommodate the mismatches between the real plant and the linear model plant used. As a disturbance, the leakage due to the ring gap with relative motion in the cylinder has been introduced. From the robust force tracking simulations, it is shown that a significant reduction in the force synchronizing error is achieved through the use of a proposed control scheme.

• Journal of the Korean Institute of Telematics and Electronics T
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• v.35T no.1
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• pp.40-47
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• 1998

The optical heads as the key parts of digital audio/video players are applied extensively from general household electric appliances to computer memory or game apparatuses, and the demand of them tends to be increased according to the extension of optical medium market. In this paper, the 2-axis actuator, the key component for focus servo and tracking servo of the optical head is designed as a type of the cantilever suspended by 4 wires. The design propriety is verified through its simulation and the characteristic analysis of its mock-ups. The other factors which influence the performance of 2-axis actuators besides the design factors of them, are also verified through the mock-up analysis.