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박동훈(Dong-Hoon Park),노성찬(Sung-Chan Rho),유광균(Kwang-Kiun Yoo) 한국철도학회 2015 한국철도학회 학술발표대회논문집 Vol.2015 No.10
열차의 위치를 파악하기 위한 궤도회로는 궤도구간을 일정한 간격으로 분할하고 있다. 이렇게 궤도구간을 분할하는 방식으로는 레일을 절단하고 중간에 레일절연을 설치하는 유절연 궤도회로와 전기적으로 전류를 차단하여 분할하는 무절연 궤도회로가 있다. 전기적으로 분리하는 무절연 궤도회로 방식은 궤도경계가 유절연 궤도회로 방식보다는 명확히 분할되지 않고 일정구간의 중첩되는 구간이 발생하게 된다. AF 무절연 궤도회로 중 S자 형태의 S-BOND는 약 7m 가량 궤도경계 중첩구간이 있다. 본 논문은 궤도회로 경계구간에 설치된 S-BOND의 중첩된 경계구간을 줄였을 때 궤도회로 동작의 정확성 향상 및 선로이용 효율증대에 관한 연구이다. A track circuit to determine a movement position of a train is divided at a regular distance. These methods of dividing the track have Joint type and Jointless type. The Joint Track Circuit has cut the rail and installs the Joint between rails. The Jointless Track Circuit without the Joint has electrically divided to cut off a current. The track boundary is not clearly separated than the Joint Track Circuit and an overlapping section is generated in the Jointless Track Circuit system. S-form S-BOND of the AF Track circuit has a track boundary overlap of approximately 7m. This paper has studied about an increase accuracy of track circuit operation and about the improvement efficiency of the line use when reduced the overlap of the SBOND installed in the track circuit boundary.
박동훈(Park, Dong-Hoon),최명진(Choi, Myung-Jin) 한국소음진동공학회 2004 한국소음진동공학회 논문집 Vol.14 No.9
A variable friction damper for vehicle driveline has been proposed. This new torsional damper system uses a solenoid as an actuator to vary friction force of the damper. To verify the idea of using a solenoid in a variable damper system, the test fixture and the dampers are made and tested. Also, to find out the range of damper friction forces that influence the vehicle driveline vibration, a mathematical model of the driveline had been developed and simulated. Test and simulation results show that, within electric current used in the vehicle electric system, the solenoid can develop enough friction force that will surpass resonance in the driveline of 1.5 L Gasoline engine vehicle during acceleration.
선형 안정성 이론을 이용한 압축성 축 대칭 원뿔 경계층의 천이지점 예측
박동훈(Dong-Hoon Park),박승오(Seung-O Park) 한국항공우주학회 2008 韓國航空宇宙學會誌 Vol.36 No.5
본 연구에서는 축 대칭 원뿔 형상 위의 압축성 경계층의 천이 지점을 선형 안정성 이론 과 e<SUP>N</SUP>-method를 이용하여 예측하였다. 축 대칭 좌표계에서의 압축성 유동 지배 방정식으로부터 압축성 원뿔 경계층의 선형 안정성 방정식을 얻었으며 안정성 방정식을 2차 정확도의 유한 차분법을 이용하여 계산하는 수치 프로그램을 개발하였다. 개발 된 코드로 원뿔 경계층의 안정성 특성 및 2차원 교란의 증폭률을 계산하고 실험결과와의 비교를 통해 검증을 수행하였다. 얻어진 교란의 증폭률을 활용하여 e<SUP>N</SUP>-method를 통해 천이지점 예측을 수행하였다. 풍동 시험 및 비행 시험 결과와의 비교를 통해 비행 조건에 있는 마하수 4와 8사이의 원뿔 경계층에 대한 본 연구의 천이지점의 예측 능력을 확인하였다. 또한 벽면 냉각이 경계층 내부 교란의 안정성 및 천이 지점에 미치는 영향을 분석하였다. In this study, the transition Reynolds number of compressible axi-symmetric sharp cone boundary layer is predicted by using a linear stability theory and the e<SUP>N</SUP>-method. The compressible linear stability equation for sharp cone boundary layer was derived from the governing equations on the body-intrinsic axi-symmetric coordinate system. The numerical analysis code for the stability equation was developed based on a second-order accurate finite-difference method. Stability characteristics and amplification rate of two-dimensional second mode disturbance for the sharp cone boundary layer were calculated from the analysis code and the numerical code was validated by comparing the results with experimental data. Transition prediction was performed by application of the e<SUP>N</SUP>-method with N=10. From comparison with wind tunnel experiments and flight tests data, capability of the transition prediction of this study is confirmed for the sharp cone boundary layers which have an edge Mach number between 4 and 8. In addition, effect of wall cooling on the stability of disturbance in the boundary layer and transition position is investigated.
박동훈(Dong-Hoon Park),최명진(Myung-Jin Choi) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
An Amplitude Proportional Friction Damper (APFD) is considered for the application to the vehicle driveline<br/> torsional damper. The frictional force is proportional to the amplitude in APFD and the system is non-linear as is<br/> Coulomb damper system. The APFD system has advantages over Coulomb damper system since it can be designed<br/> to work with no stick-slip and its damping characteristics are similar to the viscous damper system. In this study, the<br/> solutions for the response of a base-excited system with anAPFD are developed analytically through the application<br/> of a Fourier series to represent the frictional force of APFD. It is assumed that no stick-slips occur during any portion<br/> of the steady-state oscillation and the transmissibility is compared with Coulomb damper and viscous damper system.
근거리 무선 전력 전송을 위한 평형 증폭기 구조의 10MHz 10W급 전력원 설계
박동훈(Dong-Hoon Park),김귀성(Gui-Sung Kim),임은천(Eun-Cheon Lim),박혜미(Hye-Mi Park),이문규(Moon-Que Lee) 대한전기학회 2012 전기학회논문지 Vol.61 No.3
In this paper, we have designed and manufactured 10MHz power source for the application of short distance wireless power transmission. The designed power source consists of a DDS(direct digital synthesizer) signal generator, a buffer driver and a balanced power amplifier. Short range wireless power transmission is usually carried out by near-field inductive coupling between source and load. The distance variation between source and load gives rise to the change of load impedance of power amplifier, which has effect on the operation of power amplifier. To overcome this problem due to load variation of power amplifier, we have adopted the balanced power amplifier using the quadrature hybrid implemented by lumped capacitors and a mutually coupled coil. The experiment results show the above 40dBm output power, frequency range of 9 to 11MHz, and total DC power consumption of 36W.
박동훈(Dong-Hoon Park),윤상국(Sang-kook Yun) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-
LNG is extremely cold, -160℃ in its liquid state. When it vaporizes, returning to its natural state (re-vaporization), it cools its surroundings. This is cold energy. The manufacturing of liquid air is the first processes developed as the most effective utilization of LNG cold. In this paper, adopting the LNG cold process for manufacturing liquid air was developed and analysed. The result showed that as the higher air pressure and adapting nitrogen precooling, liquefaction rate and cumulative mass was increased.
박동훈(Dong-Hoon Park),김귀성(Gui-Sung Kim),김형은(Hyung-Eun Kim),박혜미(Hye-Mi Park),위개(Kai Wei),임은천(Eun-Cheon Lim),이문규(Moon-Que Lee) 대한전기학회 2011 전기학회논문지 Vol.60 No.2
In this paper, we propose an antenna module with high isolation between Tx and Rx in RFID reader module. The proposed module consists of a quadrafilar antenna and a directional coupler with a switchable dummy load to improve the directivity. The proposed module achieves the isolation higher than 20 ㏈ between Tx and Rx. To show the validity of the proposed scheme, we have performed the measurement of tagging range and multi-tagging ability. The experiment results show that the detecting range and multi-tagging ability are enhanced by 81% and 200%, respectively.
박동훈(Park.Dong Hoon) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Explanation on calculation of required torque capacity and energy capacity of friction elements in automatic transmission has given. Also, explanation on heat transfer and temperature rise in clutch pack due to the energy absorbed during the shift has given. And introduced the items that need to be considered in design stage for proper cooling.<br/>