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박윤식(Youn-sik Park),제양규(Yang-Gyu jei),오동엽(Dong-Yup Oh) 한국자동차공학회 1985 오토저널 Vol.7 No.4
An analytical and experimental modal analysis is carried out upon a crankshaft of a four cylinder internal combustion engine for studying dynamic characteristics of the shaft. Influence coefficient method is adopted in modelling the object and the calculated dynamic properties are directly compared with the experimentally obtained torsional and bending natural frequencies and mode shapes. It is found that the test results are well agree with the outputs from analytical model especially in low harmonics.
박윤식 ( Youn Shik Park ),김종건 ( Jonggun Kim ),김남원 ( Nam Won Kim ),( Bernie Engel ),신동석 ( Dong Seok Shin ),옥용식 ( Yong Sik Ok ),최중대 ( Joongdae Choi ),임경재 ( Kyoung Jae Lim ) 한국농공학회 2009 한국농공학회 학술대회초록집 Vol.2009 No.-
In the last decade, many methods such as greet chamber, reservoir, or debris barrier, have been utilized to manage and prevent muddy water problem. The Vegetative Filter Strip (VFS) has been thought to be one of the most effective methods to trap sediment effectively. The VFS are usually installed at the edge of agricultural areas adjacent to stream or drainage ditches, and it has been shown that the VFS effectively removes pollutants transported with upland runoff. But, if the VFS is installed without any scientific analysis of rainfall-runoff characteristics, soil erosion, and sediment analysis, it may not reduce the sediment as much as expected. Although Soil and Water Assessment Tool (SWAT) model has been used worldwide for many hydrologic and Non-Point Source Pollution (NPSP) analysis at a watershed scale. but it has many limitations in simulating the VFS. Because it considers only 'filter strip width' when the model estimates sediment trapping efficiency, and does not consider the routing of sediment with overland flow option which is expected to maximize the sediment trapping efficiency from upper agricultural subbasin to lower spatially-explicit filter strip. Therefore, the SWAT overland flow option between landuse-subbasins with sediment routing capability was enhanced with modifications in SWAT watershed configuration and SWAT engine. The enhanced SWAT can simulate the sediment trapping efficiency of the VFS in the similar way as the desktop VFSMOD-w system does. Also it now can simulate the effects of overland flow from upper subbasin to reflect the increased runoff volume at the receiving subbasin, which is what is occurring at the field if no diversion channel is installed. In this study, the enhanced SWAT model was applied to small watershed located at Jaun-ri in South Korea to simulate diversion channel and spatially-explicit VFS. It was found that approximately sediment can be reduced by 31%, 65%, 68%, with diversion channel, the VFS, and the VFS with diversion channel, respectively.
박미유(Park, Mi-You),박영진(Park, Youngjin),박윤식(Park, Youn-sik) 한국소음진동공학회 2005 한국소음진동공학회 논문집 Vol.15 No.3
Structural Dynamics Modification (SDM) is a very effective technique to improve structure's dynamic characteristics by adding or removing auxiliary structures, changing material properties and shape of structure. Among those of SDM technique, the method to change shape of structure has been mostly relied on engineer's experience and trial-and-error process which are very time consuming. In order to develop a systematic method to change structure shape, surface grooving technique is studied. In this work, the shape of base structure was modified to improve its dynamic characteristics such as natural frequencies via surface grooving technique. Grooving shape was formed by mergingthe neighboring small embossing elements after analyzing frequency increment sensitivities of all the neighboring emboss elements. For this process, Criterion Factor was introduced and the initial grooving was started from the element having highest strain energy and the grooving is expanded into neighboring element. The range of targeting grooving area to check its frequency variations restricted to their neighboring area to reduce the computation effort. This surface grooving technique was successfully applied to a hard disk drives (HDD) cover model to raise its natural frequency by giving some groove on its surface.
방정훈,박윤식,Pang, Jeong-Hun,Park, Youn-Sik 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.7
A method of obtaining a control input to reduce residual vibration was developed for nonlinear time-varying systems moving along pre-determined two dimensional paths. First, the nonlinear system equation was solved with nominal input then linearized by nominal response which is defined at equilibrium point. Next an additional input can be obtained by solving the linearized equation that should satisfied the required boundary conditions. Residual vibration reduction was experimentally verified by applying the control input, which is sum of nominal and additional input, to a moving pendulum whose length is varying time.
Development of the SWAT DWDM for Accurate Estimation of Soil Erosion from an Agricultural field
장원석,박윤식,김종건,김남원,최중대,옥용식,양재의,임경재,Jang, Won-Seok,Park, Youn-Shik,Kim, Jong-Gun,Kim, Nam-Won,Choi, Joong-Dae,Ok, Yong-Sik,Yang, Jae-E,Lim, Kyoung-Jae The Korean Society of Agricultural Engineers 2010 한국농공학회논문집 Vol.52 No.1
준분포형 모형인 SWAT 모형은 소유역내 수문학적 반응단위 별로 유출, 유사 등의 발생을 평가하는데 이때 Hydrological Response Unit (HRU)의 지형정보가 활용된다. 현재 SWAT 모형의 인터페이스 구조는, 각 소유역의 평균 지형인자 값이 각 소유역내의 모든 HRU의 지형정보로 사용된다. 그러므로 각 소유역내의 HRU에 있는 지형인자를 정확하게 추출하기 위해서는 수계를 자세하게 나누어야 하며, 이를 위해서 더욱 자세한 소유역 수계 인터페이스가 필요하다. 현재 SWAT 모형 인터페이스에서는 수계를 나눌 때 임계값의 최소값은 최대 flow accumulation 값의 0.1 %가 사용된다. 따라서 HRU의 지형인자를 추출하기 위해 아주 자세한 정도로 소유역의 수계를 나눈다는 것은 불가능하다. 본 연구에서는 사용자가 원하는 임계값과 농경지 경계를 근거하여 소유역 경계를 추가로 수계를 나눌 수 있는 Dual Watershed Delineation Module (DWDM) 을 개발하였다. 기존 SWAT의 수계추출 모듈로 유량을 모의한 결과 $27,219\;m^3$/month 가 산정되었고, DWDM 을 적용한 결과 $26,172\;m^3$/month 로 약 3.8 %의 미미한 차이가 생겼다. 하지만 유사의 경우 DWDM을 적용하기 전에는 0.779 ton/month, 적용 후에는 2.688 ton/month 로 약 245 %의 차이를 보였다. 즉 농경지를 추가적으로 수계를 나눌 때 유사의 가장 민감한 요소인 경사장을 실제지형에 맞게 고려함에 따라 좀 더 정확한 유사 산정을 할 수 있었다. 농경지에서의 정확한 수문 및 유사 평가 시 본 연구에서 개발한 모듈이 적용 되어야 한다고 사료된다.
인휠 모터 전기 자동차의 히브와 피치 운동 제어에 대한 동적 분석
박진성(Jinseong Park),박영진(Youngjin Park),박윤식(Youn-Sik Park) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Dynamic analysis of ride control for In-wheel motor in Electric vehicle is studied using Degree of Disturbance Rejectability. Half car model including heave and pitch motions as well as longitudinal motion is used and actuator dynamics is augmented to emphasize the advantage of in-wheel motor compared to internal combustion engine. It is found that ride control when vehicle is driven at random noise is possible only with in-wheel motor while internal combustion engine vehicle need additional suspension controller to control heave and pitch motion because internal combustion engine has very low response.
인간형 로봇의 자세제어를 위한 안정화 제어를 이용한 퓨전 센서 시스템 개발
박진성(Jinseong Park),박영진(Youngjin Park),박윤식(Youn-Sik Park),홍덕화(Deokhwa Hong),이현기(Hyunki Lee),조형석(Hyungsuck Cho) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
Position estimating fusion sensor system is proposed to control attitude of the humanoid robot. To apply vision sensor to control the attitude of the humanoid robot we should solve limitations of vision sensor which are low sampling frequency, estimation time delay and limited estimation range. Sensor fusion with MEMS gyro sensor can remove estimation time delay and increase sampling frequency. Stabilization control can remove limited estimation range by regulating of the vision sensor to initial position all the time. In this research, humanoid robot is modeled as one axis inverted pendulum which represents a leg of the humanoid robot.