• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2008년도 추계학술대회논문집
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• pp.99-104
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• 2008

The Carbon fiber epoxy composite material and aluminum have many advantages about higher specific stiffness and good fatigue characteristics. basically, the propeller shaft of automobile must satisfy high natural frequency more than 9,200 rpm to satisfy high number of rotation and high torsion torque more than 2,700Nm. In these reason, studied natural frequency and torsion torque characteristics of shaft according to parameter variations with the outdiameter and thickness. From the torsion tester and natural frequency experiments FE analyses was compared vibration and torque characteristics of hybrid shaft Designed hybrid shaft was experimented through FFT analyzer and torsion tester each and satisfied that hybrid shaft reverence 60mm and thickness 5mm by a these experiment is most suitable. Therefore, that can manufacture existent steel two piece type propeller shaft to one piece type hybrid shaft.

• 대한기계학회논문집
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• 제17권8호
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• pp.1980-2000
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• 1993

The stresses and torque transmission capabilities of adhesively bonded circular, hexagonal and elliptical lap joints were analyzed by the finite element and compared with the experimental results. The adherends of the joints were composed of carbon fiber/epoxy composite shafts and steel shafts. In calculating the torque transmission capabilities, the linear laminate properties of the composite material and the nonlinear shear properties of the adhesive were used. Using this method, the torque transmission capabilities of adhesively bonded lap joints could be obtained within 10% error compared to the experimental results except some single lap joints. The experiments revealed that the hexagonal joint had the best torque transmission capability from the single lap joints and the double lap joint had better torque transmission than the single lap joint.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.1111-1112
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• 2011

This paper investigated application of fractional-slot concentrated-winding axial flux permanent magnet machines for wind turbines. Design criteria of cogging torque and voltage regulation was firstly proposed for this kind of application. Fractional winding has small cogging torque which is highlight for wind turbines, but slot leakage inductance would increase voltage regulation, which is an important performance index of generators. By varying slot opening, cogging torque and slot leakage inductance could be adjusted. In this paper, cogging torque and inductances were calculated by both analytical and finite element methods. Voltage regulation was studied by two-axis model under unity-power-factor load and verified by transient finite element analysis.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.826-827
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• 2011

The selection of optimum parameters in electromagnetic design usually requires optimization of multimodal, non linear functions. This leads to extensive calculations which pose a huge inconvenience in the design process. This paper proposes a novel algorithm for dealing efficiently with this issue. Through the use of contour line concept coupled with Kriging, the algorithm finds out all the peaks in the problem domain with as few function calls as possible. The proposed algorithm is applied to the magnet shape optimization of an axial flux permanent magnet synchronous machine and the cogging torque was reduced to 79.8% of the initial one.

• 동력기계공학회지
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• 제4권3호
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• pp.55-61
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• 2000

In this study, a new design of an one-body type of an unbalanced-fixed- displacement type vane pump combined with an induction type electric motor was suggested. By the application of the new design scheme, it was possible to reduce the number of parts of the pump system and to cut down the volume of power package than that of already-used products. The case in this study enabled efficient heat transfer and electricity insulation of hydraulic fluid. Thus oil moves through the inside of the package for cooling and returns to the reservoir. Because of this design, it was difficult to measure the shaft-input torque. Therefore the package overall efficiency in the paper was evaluated with a ratio of hydraulic power and electric power.

• 동력기계공학회지
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• 제15권4호
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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.

• 한국정보통신학회논문지
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• 제5권7호
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• pp.1308-1313
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• 2001

본 논문은 3상 유도전동기의 파라미터 측정정법과 기동특성을 제시한다. 고정자 권선저항, 구속 및 무부하시험에 의해 측정된 유도전동기 파라미터를 이용하여 전동기의 기동특성을 시뮬레이션 하였다. 또한 유도전동기 축에 스트레인 게이지를 부착하여 기동토크에 대한 특성을 실험으로 확인하고 이를 시뮬레이션 결과와 비교 분석하여 그 타당성을 검증하였다.

• 대한전기학회논문지
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• 제40권8호
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• pp.816-824
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• 1991

It is well known that dynamic control is needed for fast and accurate control. Neural networks are ideal for representing the strongly nonlinear relationship in the dynamic equations including complex unmodeled effects. It thus creates many advantages over conventional methods such as simple, fast and accurate control through neural network's inherent learning and massive parallelism. In this paper, dynamic control of the full six degrees of freedom of an industrial robot arm will be presented using neural networks. Moreover, through application to a real robot the usefulness of neurocontrol is demonstrated. The back propagation and feedback-error learning is used to train the neurocontroller. Simulated control of a PUMA 560 arm demonstrates that it moves at high speed with good accuracy and generalizes over untrained trajectories as well as adapt to unforseen load changes and sensor noise.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1990년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 26-27 Oct. 1990
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• pp.1-6
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• 1990

Neural network is a computational model of ft biological nervous system developed ID exploit its intelligence and parallelism. Applying neural networks so robots creates many advantages over conventional control methods such as learning, real-time control, and continuous performance improvement through training and adaptation. In this paper, dynamic control of a six-link robot will be presented using neural networks. The neural network model used in this paper is the backpropagation network. Simulated control of the PUMA 560 am shows that it can move a high speed as well as adapt to unforseen load changes and sensor noise. The results are compared with the conventional PD control scheme.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2015년도 제46회 하계학술대회
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• pp.157-158
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• 2015

본 논문은 직렬 보상 커패시터 사용으로 인해 발생될 수 있는 SSR(Subsynchronous Resonance) 현상을 해석하기 위한 도구로서 EMTDC의 활용에 관해 다루고 있다. EMTDC를 이용한 순시치 기반의 계통 해석은 주파수 스캔이나 Eigenvalue 계산법의 한계를 보완할 수 있다. EMTDC 기반 해석의 효용성을 검증하기 위해 IEEE 2nd Benchmark 모델을 PSCAD/EMTDC로 구현하였고, 시뮬레이션을 통해 유도 발전기 효과와 비틀림 상호작용 및 축 토크 증폭 현상을 검증했다. 또한, SSR의 억제 수단으로 SVC와 보조제어기를 발전기단에 투입하였고, 그 억제 효과를 시뮬레이션으로 검증하였다.