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부하감응 시스템 MCV 제어용 EPPR 밸브 개발 및 센서리스 고장진단에 관한 연구
윤진호(J. H. Yun),장달식(D. S. Jang),구준태(J. T. Koo),신상우(S. W. Shin),차상봉(S. B. Cha),이준엽(J. Y. Lee),유승진(S. J. Yoo) 유공압건설기계학회 2023 유공압건설기계학회 학술대회논문집 Vol.2023 No.5
Over the years, the number of agricultural workers as a percentage of the total population has been declining. As a result, the agricultural market is faced with the challenge of meeting the same food demand as before with fewer people. As a solution to these problems, automation of agricultural machinery is emerging. In this study, we develop Electric Proportional Pressure Reducing(EPPR) valve, which is a key part of agricultural machinery automation. The EPPR valve is a component that can vary the discharge pressure by using the suction force generated according to the signal input to the coil. It can be used for various purposes in agricultural machinery, and it used here is to control the Main Control Valve(MCV) spool of the Load Sensing system. The Load Sensing system is a circuit that reduces wasted energy by varying the pump according to the work load. The reliability of the EPPR valve is secured through the sensorless fault diagnosis system. After obtaining the Magnetic Flux Linkage Diagram using the current and voltage input to the coil, various failure analyzes can be performed by comparing it with a normal product. We check hysteresis and repeatability to evaluate EPPR valve performance. A total of 6 failure types are selected: Coil Failure, Spring Failure, Part Omission, Electromagnetic Top Pollution, Sliding Part Adhesion and Excessive Sliding Friction. In addition, machine learning techniques are used to ensure higher reliability as the test is repeated.
육인수,이성호,진호,선광일,박수종,이대희,남욱원,문봉곤,차상목,한정열,경재만,김건희,양진석,Yuk, I.S.,Lee, S.L.,Jin, H.,Seon, K.I.,Pak, S.,Lee, D.H.,Nam, U.W.,Moon, B.K.,Cha, S.M.,Han, J.Y.,Kyeong, J.M.,Kim, K.H.,Yang, J.S. 한국천문학회 2005 天文學論叢 Vol.20 No.1
KASI (Korea Astronomy and Space Science Institute) is developing the near-infrared camera system named KASINICS (KASI Near-Infrared Camera System) which will be installed at the 60cm f/13.5 Ritchey-Chretien telescope of the Sobaeksan Optical Astronomy Observatory (SOAO). The camera system is optimized for JHKL bands and has a 6 arcmin FOV. The optical system consists of two spherical mirrors and a 8-position filter wheel. With the exception for the dewar window, all optical elements are cooled inside cryogenic dewar. Since the Offner system is adopted to prevent thermal noises from outside of the telescope primary mirror, the secondary mirror of the Offner system acts as a cold Lyot stop. The optical performance does not change by temperature variations because the Aluminum mirrors contract and expand homogeneously with its mount. We finished the design and fabrication of the optical parts and are now aligning the optical system. We plan to have a test observation on 2006 January.