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회전관성의 순환최소자승 추정을 이용한 모델 예견 기반 굴삭기의 충돌회피 알고리즘 개발
오광석,서자호,이근호,Oh, Kwang Seok,Seo, Jaho,Lee, Geun Ho 유공압건설기계학회 2016 드라이브·컨트롤 Vol.7 No.4
This paper proposes a model-prediction-based collision-avoidance algorithm for excavators for which the recursive-least-squares (RLS) estimation of the excavator's rotational inertia is used. To estimate the rotational inertia of the excavator, the RLS estimation with multiple forgetting and two updating rules for the nominal parameter and the forgetting factors was conducted based on the excavator-swing dynamics. The average value of the estimated rotational inertia that is for the minimizing effects of the estimation error was computed using the recursive-average method with forgetting. Based on the swing dynamics, the computed average of the rotational inertia, the damping coefficient for braking, and the excavator's braking angle were predicted, and the predicted braking angle was compared with the detected-object angle for a safety evaluation. The safety level defined in this study consists of the three levels safe, warning, and emergency braking. The analytical rotational-inertia-based performance evaluation of the designed estimation algorithm was conducted using a typical working scenario. The results of the safety evaluation show that the predictive safety-evaluation algorithm of the proposed model can evaluate the safety level of the excavator during its operation.
굴삭기를 위한 레이저 스캐너 기반 확률 및 예견 작업 위험도 평가 알고리즘 개발
오광석,박성렬,서자호,이근호,이경수,Oh, Kwang Seok,Park, Sung Youl,Seo, Ja Ho,Lee, Geun Ho,Yi, Kyong Su 유공압건설기계학회 2016 드라이브·컨트롤 Vol.7 No.4
This paper presents a stochastic and predictive working-risk-assessment algorithm for excavators based on a one-layer laser scanner. The one-layer laser scanner is employed to detect objects and to estimate an object's dynamic behaviors such as the position, velocity, heading angle, and heading rate. To estimate the state variables, extended and linear Kalman filters are applied in consideration of laser-scanner information as the measurements. The excavator's working area is derived based on a kinematic analysis of the excavator's working parts. With the estimated dynamic behaviors and the kinematic analysis of the excavator's working parts, an object's behavior and the excavator's working area such as the maximum, actual, and predicted areas are computed for a working risk assessment. The four working-risk levels are defined using the predicted behavior and the working area, and the intersection-area-based quantitative-risk level has been computed. An actual test-data-based performance evaluation of the designed stochastic and predictive risk-assessment algorithm is conducted using a typical working scenario. The results show that the algorithm can evaluate the working-risk levels of the excavator during its operation.
오광석 ( Kwang-seok Oh ),김동영 ( Dong-young Kim ),남윤빈 ( Yoon-bin Nam ),조승주 ( Seung-joo Cho ),최현경 ( Hyun-gyung Choi ) 한국정보처리학회 2017 한국정보처리학회 학술대회논문집 Vol.24 No.2
‘스마트 저금통’ 이란 많은 사람들이 일상생활에서 흔히 쓰는 저금통을 IoT기술과 접목시켜 더욱 편리하게 사용할 수 있게 만든 스마트 저금통이다. 화폐(지폐, 동전)인식 및 분류, 저금통과 앱 간의 연동을 통한 손쉬운 금액관리 및 다양한 부가 서비스를 제공하고, 스마트폰을 활용한 가상화폐전환 및 간편결제 등의 핀테크를 통한 저축 및 쇼핑 등이 가능하다.
망각인자 기반 순환최소자승 기법을 이용한 감쇠 시스템의 적응형 모델 독립 제어 알고리즘 개발
오광석(Kwang Seok Oh) 대한기계학회 2018 大韓機械學會論文集A Vol.42 No.2
본 논문은 감쇠 시스템을 위한 망각인자 기반 순환최소자승 기법을 이용한 적응형 모델 독립 제어 알고리즘 개발에 관한 것이다. 현실에서 복잡하고 비선형적 특성을 보이는 대상 시스템을 제어하기 위해서는 선형화된 수학적 모델 없이는 합리적인 제어성능을 확보하기 어렵다. 하지만 대상 시스템의 특정 구간별 입력과 출력의 관계는 일반적으로 1계 시스템으로 근사화될 수 있기 때문에 본 연구에서 제안하는 적응형 모델 독립 제어 알고리즘은 입력과 출력을 이용하여 복잡하고 비선형적 특성을 보이는 대상 시스템을 1계 시스템으로 추정하는 방법을 사용한다. 추정된 1계 시스템의 불확실성은 시스템의 입력과 출력을 이용하는 외란관측기를 이용해 추정되었으며 제어 입력을 도출하는데 사용되었다. 제안된 제어 알고리즘의 성능평가를 위해 복잡하고 비선형 특성을 갖는 수학적 모델과 실제 모터 시스템을 이용하였다. 성능평가 결과 대상 시스템의 입력과 출력만을 이용하여 시스템의 출력을 합리적으로 제어하는 것을 확인할 수 있었다. This paper presents an adaptive model-free control algorithm for damped systems based on recursive least-squares with multiple forgetting. It is difficult to control a complex nonlinear system in the real world, for reasonable control performances, without proper mathematical model of the system. However, the input-output relationship in a specific data region of the system can be approximated as a first-order system. Therefore, the developed adaptive model-free control algorithm in this paper has been designed to estimate the objective complex nonlinear system as a first-order system using the input-output relationship. The uncertainty of the estimated first-order system based on input and output has been estimated using the disturbance observer method, and the estimated disturbance has been used for the computation of the control input. In order to evaluate the performance of the developed control algorithm, a complex nonlinear mathematical model and actual DC servo motor system were used. The results show that the developed adaptive model-free control algorithm in this paper can control the output of the system to track the desired output reasonably using only input and output information.
굴삭기를 위한 레이저 스캐너 기반 확률 및 예견 작업 위험도 평가 알고리즘 개발
오광석(Kwang Seok Oh),박성렬(Sung Youl Park),서자호(Ja Ho Seo),이근호(Geun Ho Lee),이경수(Kyong Su Yi) 유공압건설기계학회 2016 드라이브·컨트롤 Vol.13 No.4
This paper presents a stochastic and predictive working-risk-assessment algorithm for excavators based on a one-layer laser scanner. The one-layer laser scanner is employed to detect objects and to estimate an object’s dynamic behaviors such as the position, velocity, heading angle, and heading rate. To estimate the state variables, extended and linear Kalman filters are applied in consideration of laser-scanner information as the measurements. The excavator’s working area is derived based on a kinematic analysis of the excavator’s working parts. With the estimated dynamic behaviors and the kinematic analysis of the excavator’s working parts, an object’s behavior and the excavator’s working area such as the maximum, actual, and predicted areas are computed for a working risk assessment. The four working-risk levels are defined using the predicted behavior and the working area, and the intersection-area-based quantitative-risk level has been computed. An actual test-data-based performance evaluation of the designed stochastic and predictive risk-assessment algorithm is conducted using a typical working scenario. The results show that the algorithm can evaluate the working-risk levels of the excavator during its operation.