화상 카메라을 이용한 이동체 자동 추적 기법

양경부,조경호 제주대학교 공과대학 첨단기술연구소 2006 尖端技術硏究所論文集 Vol.17 No.1

Image processing field that is required the large number of data and a fast processing time is appling and developing to a various filed because of computer's development. But an object tracking is very difficult with a moving camera. In this paper we applied a difference frame method and HSI color model in this automatic tracking system for moving object.

경로 트리밍을 이용한 항공 라우팅용 공구경로 생성

양경부,조경호 제주대학교 공과대학 첨단기술연구소 2007 尖端技術硏究所論文集 Vol.18 No.-

An offset loop of profiles in sheet metal part is a tool paths for profile-machining, Offsetting is one of the most geometric problem in case of complex shape. In this paper we describe a method for generating NC tool paths for aerospace routing process using path trimming based on pair-wise intersection.

방향별 후류를 고려한 풍력발전단지 연간 에너지 생산량 예측 프로그램 개발 및 적용

양경부(Kyoungboo Yang),조경호(Kyungho Cho),허종철(Jongchul Huh) 대한기계학회 2017 大韓機械學會論文集B Vol.41 No.7

풍력발전단지에서 연간 에너지 생산량 예측의 정확도를 위해서는 바람 방향별 후류영향에 의한 풍속감소와 이에 따른 발전량 손실을 효과적으로 계산하여야 한다. 본 연구에서는 연간 에너지 생산량 예측을 위하여 방향별 후류영향을 고려한 계산 프로그램을 개발하고, 예측 적합성을 확인하기 위해 실제 풍력발전단지의 연간 에너지 생산량 분석 결과 및 기존 상용 소프트웨어의 계산결과와 비교하였다. 적용된 계산식들은 기존 이론들을 바탕으로 하고 있어 상용 소프트웨어와 동일하지만 풍향별 후류영향 범위의 계산과정에서 차이가 있다. 비교결과 개발 프로그램은 실제 풍력발전단지 전체 시스템 이용율에 1% 이내로 근접하였고 기존 상용 프로그램을 이용한 예측 결과보다 2% 이상 실제 연간 시스템 이용율에 근접하는 결과를 보여주었다. For accurate AEP prediction in a wind farm, it is necessary to effectively calculate the wind speed reduction and the power loss due to the wake effect in each wind direction. In this study, a computer program for AEP prediction considering directional wake effect was developed. The results of the developed program were compared with the actual AEP of the wind farm and the calculation result of existing commercial software to confirm the accuracy of prediction. The applied equations are identical with those of commercial software based on existing theories, but there is a difference in the calculation process of the detection of the wake effect area in each wind direction. As a result, the developed program predicted to be less than 1% of difference to the actual capacity factor and showed more than 2% of better results compared with the existing commercial software.

유전 알고리즘을 이용한 풍력터빈 최적배치에 관한 연구

양경부(Kyoungboo Yang),조경호(Kyungho Cho),허종철(Jongchul Huh) 대한기계학회 2018 大韓機械學會論文集B Vol.42 No.6

공학적 관점에서 풍력발전단지의 최대 목표는 풍력발전단지에서 생산되는 전기 에너지 생산량을 최대화 하는 것이다. 본 연구에서는 풍력발전단지 설계시 제한된 공간내에서 후류로 인한 에너지 손실을 최소화하여 생산되는 에너지를 최대화하기 위한 풍력터빈 최적배치 알고리즘을 개발하였다. 개발 알고리즘은 확률론적 최적화 기법의 하나인 유전 알고리즘을 기반으로 풍력터빈 배치에 적합한 염색체를 구성하고 단지효율을 목적함수로 사용하여 실제 풍력발전단지를 대상으로 그 성능을 검토하였다. 알고리즘 수행 결과 기존 배치 보다 연간 시스템 이용율이 1.4% 향상되면서 기존 배치의 연간 에너지 생산량 보다 높은 연간 에너지를 발생하는 배치결과를 도출함으로써 풍력단지 설계 과정에 자동배치 알고리즘의 적용 가능성을 보여주었다. The main purpose of a wind farm from an engineering perspective is to achieve maximum energy production. In this study, an algorithm for layout optimization of wind turbines was developed to maximize energy production. This maximized energy production can be achieved by minimizing energy losses due to the wake effects of individual wind turbines. The developed algorithm is based on a genetic algorithm which is one of the stochastic optimization methods. We tested the performance of the algorithm using park efficiency as an objective function in a real wind farm. Results showed that the algorithm yielded an annual capacity factor that was 1.4% higher than that of the existing layout. Our optimal layout algorithm showed the applicability of this automatic layout method to wind farm design and thus can assist to produce more annual energy in wind farm.

풍력단지에서의 Jensen 후류모델 후류감소계수 영향 분석

양경부(Yang Kyoungboo),고경남(Ko Kyungnam) 한국태양에너지학회 2024 한국태양에너지학회 논문집 Vol.44 No.1

Wind turbines exchange wake effects with each other on wind farms, resulting in wake loss that reduces the power production of the wind farm. Various wake models have been developed to calculate these wake effects. Among them, the Jensen wake model is the most widely used. The model has a wake decay constant parameter for considering the topographical environment of the wind farm. However, setting this wake decay constant relies on the subjective judgment of the designer. In this study, a simulation program was developed to examine the effect of the wake decay constant of the Jensen wake model. The simulation results were compared with data collected from an actual wind farm. Consequently, the output of the downstream wind turbine was reduced due to the wake. By analyzing the effect of the wake decay constant, when the recommended value was applied, the results matched the measured values in certain cases but did not in others. However, when the wake decay constant calculated using the turbulence intensity was applied, the results were generally similar to those of the actual data.

2차원 연속체요소를 이용한 박판금속 성형공정의 해석

정동원,양경부 濟州大學校 工科大學 産業技術硏究所 1998 尖端技術硏究所論文集 Vol.9 No.1

The study is concerned with two-dimensional rigid-plastic finite element analysis of deep drawing process by using the continuum elements. The analysis of sheet metal forming process has three element types: membrane, shell and continuum element. The membrane analysis is frequently used due to the short computational time. However, in the membrane analysis the bending effects can not be considerde at all. The shell analysis allows the consideration of bending effects, but involves too much computational time then membrane analysis. The continuum analysis allows the consideration of realistic bending effects and calculated the accuracy thickness strain then the shell analysis in the sheet metal forming process, but involves an amount computational time. Therefore little analysis by using the continuum element. Recently, as a fast development of comuter hardware, this study carried out the analysis by using the continuum element in order to obtain the accuracy results

2차원 연속체요소를 이용한 박판금속 성형공정의 해석

정동원,양경부 濟州大學校 産業技術硏究所 1998 산업기술연구소논문집 Vol.9 No.1

The study is concerned with two-dimensional rigid-plastic finite element analysis of deep drawing process by using the continuum elements. The analysis of sheet metal forming process has three element types: membrane. shell and continuum element. The membrane analysis is frequently used due to the short computational time. However, in the membrane analysis the bending effects can not be considerde at all. The shell analysis allows the consideration of bending effects. but involves too much computational time then membrane analysis. The continuum analysis allows the consideration of realistic bending effects and calculated the accuracy thickness strain then the shell analysis in the sheet metal forming process . but involves an amount computational time. Therefore little analysis by using the continuum element. Recently, as a fast development of comuter hardware, this study carried out the analysis by using the continuum element in order to obtain the accuracy results

나셀라이다 측정값을 이용한 윈드비어 방향에 따른 풍력발전기 출력변동 특성

투멘바야르 운다르마,양경부,고경남 한국동력기계공학회 2024 동력시스템공학회지 Vol.28 No.1

높이에 따른 풍향 변화, 즉, 윈드비어가 풍력발전기의 출력성능에 미치는 영향을 알아보기 위하여, 본 연구에서는 제주도 북동쪽에 위치한 풍력발전단지의 2MW 풍력발전기 나셀 위에 설치된 나셀라이다로 바람조건을 측정하였다. 풍력발전기의 출력을 SCADA 시스템에서 취득하였다. 나셀라이다측정값의 정확도 검토는 나셀라이다와 기상탑의 허브높이 풍속을 비교하여 수행되었다. 윈드비어 발생빈도와 허브높이에서의 바람 장미를 분석하였다. 윈드비어는 풍향이 높이에 따라 시계방항으로 변동하는 비어링윈드 조건,풍향이 높이에 따라 반시계방향으로 변동하는 백킹윈드 조건 그리고 높이에 따라 풍향 변동이 거의 없는 노비어의 3가지 조건으로 구분하였다. 이 조건을 적용하여 풍력발전기의 출력곡선을 산출하고 서로 비교되었다. 또한 노비어 조건을 기준으로 비어링윈드과 백킹윈드의 연간에너지발전량의 상대오차를 산출하여 비교 분석하였다. 그 결과, 비어링윈드 조건에서 연간에너지발전량의상대오차 값은 0.9%에서 4.5% 사이로 분석되었으며, 이는 풍력발전기의 출력이 증가함을 보여 준다. 반면 백킹윈드 조건의 상대오차 값은 -0.4%에서 -0.2% 사이로 풍력발전기의 출력이 감소함을 보였다. In order to find out the effect of the wind direction shift with height, wind veer, on wind turbine power performance, wind conditions using a nacelle lidar installed on a 2 MW wind turbine were measured at a wind farm located on the northeastern part of Jeju Island. The power outputs were collected from SCADA system of the turbine. The accuracy of the nacelle lidar measurements was checked by comparing the wind speeds from the nacelle lidar with those from a nearby met mast. Wind veer frequencies and wind rose at the hub height of the turbine were analyzed. The wind veer types were divided into three: veering wind which is clockwise wind direction change with height, backing wind meaning counterclockwise and no veer wind that is little wind direction change with height. The power curves were derived from dataset of the three types of wind veer, which were compared one another. Also, the relative error of annual energy production (AEP) was analyzed for veering and backing conditions using no veer condition as a reference. The findings revealed that the relative errors of the veering wind condition ranged between 0.9% and 4.5% which led to overperformance of the wind turbine, while backing wind condition had relative errors ranged from -0.4% to -0.2% which resulted in underperformance of the wind turbine.

제주지역 풍력발전량 실시간 감시 시스템 구축에 관한 연구

김경보(Kim Kyoung-Bo),양경부(Yang Kyung-Bu),박윤호(Park Yun-Ho),문창은(Mun Chang-eun),박정근(Park Jeong-Keun),허종철(Huh Jong-Chul) 한국태양에너지학회 2010 한국태양에너지학회 논문집 Vol.30 No.3

A real-time monitoring system was developed for transfer, receive, backup and analysis of wind power data at three wind farm(Hang won, Hankyung and Sung san) in Jeju. For this monitoring system a communication system analysis, a collection of data and transmission module development, data base construction and data analysis and management module was developed, respectively. These modules deal with mechanical, electrical and environmental problem. Especially, time series graphic is supported by the data analysis and management module automatically. The time series graphic make easier to raw data analysis. Also, the real-time monitoring system is connected with wind power forecasting system through internet web for data transfer to wind power forecasting system's data base.

최적배치를 위한 2D-Word 패턴 및 비트연산자 개발

김영근(Y. G. Kim),양경부(K. B. Yang),조경호(K. H. Cho) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6

We propose a new nesting method based upon the word representation of parts and raw sheets. In this new representation, the pixel patterns of parts and sheets are converted to proper word-sets. And all the usual nesting processes such as part allocations, de-allocations, overlap testings and etc. can be performed through the bit operations between words of the parts and sheets. The proposed method shows some possibilities to overcome the shortcomings of the traditional pixel-based nesting.