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권상우(S. W. Kwon),정원택(W. T. Jeong),공유식(Y. S. Kong),김영식(Y. S. Kim),김선진(S. J. Kim) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
Dissimilar friction welding were produced using 15㎜ diameter solid bar in chrome molybedenum steel(KS SCM440) to carbon steel(KS S45C) to investigate their mechanical properties. The main friction welding parameters were selected to endure good quality welds on the basis of visual examination, tensile tests, Virkers hardness surveys of the bond of area and HAZ and macrostructure investigations. The specimens were tested as-welded and post-weld heat-treated. The tensile strength of the friction welded steel bars was increased up to 100% of the S45C base metal under the condition of all heating time. Optimal welding conditions were n=2,000(rpm), P₁=60(MPa), P₂=100(MPa), t₁=4(s), t₂=5(s) when the total upset length is 5.4(㎜).
스마트폰 앱을 이용한 산업용 엔진의 모니터링 시스템 개발에 관한 연구
정찬세(C. S. Jeong),김용석(Y. S. Kim),정영만(Y. M. Jeong),고주현(J. H. Kho),정광식(K. S. Jeong),이효성(H. S. Lee),양순용(S. Y. Yang) 유공압건설기계학회 2013 드라이브·컨트롤 Vol.10 No.2
In this study, a wire/wireless communication system transmitting the operation data of engine from the ER (Engine Room) to the engine controller of ECR(Engine Control Room) has been developed through the communication of ISM(Industrial Science Medical) Band for the test operation environment improvement of medium speed engine. This wire/wireless communication system is composed of the RTU (Remote Terminal Unit) gathering and transmitting engine data as well as the MCU (Master Control Unit) receiving engine status information from the RTU to be sent to the engine controller (PLC). Through this study, a trial product of RTU and MCU has been manufactured. A test bench that has made temperature, pressure and pick-up sensor into a module for the local test of prototype was produced a test bench. In addition, at the same time save the data to a Web server and the smart phone real-time monitoring system has been developed using Wi-Fi communications. The ultimate objective of this study is to develop a wireless smart phone monitoring system of engine for the operator of engine to be able to monitor and control engine status even from the outside of engine room and control room based on this study.