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Defect Detection of Laser Drilling Micro Holes Using Photodiode Sensor and Autoencoders
S. M. Lee(이수민),M. K. Jeong(정민기),D. W. Yeo(여대원),Y. K. Lee(이용관) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
Laser micro drilling is a manufacturing method commonly used to drill holes of microscopic diameters into metals. The size and quantity of holes drilled pose a challenge in accurate, thorough, and time-efficient quality control. We observed an abnormal amount of visible light scattered when the laser failed to drill through the material and created a defective hole. Using this observation, we hypothesized there would be a difference in the pattern of light around the work area during successful and defective drilling. In this paper we propose the usage of a photodiode sensor and autoencoders for in-situ progress monitoring and defect detection of laser micro drilling. We generated simulation data of the expected power over time prior to the data collection and trained CNN and LSTM autoencoders as a proof of concept. The photodiode sensor was installed at an angle to the 1064 nm Nd:YAG Laser to collect scattered, reflected and emitted light. Data collected showed high similarity to the general pattern of simulated data.
연비 평가를 위한 6속 DCT기반 HEV 성능 시뮬레이터의 개발
백진주(J. J. Baek),이용관(Y. K. Lee),박진현(J. H. Park),한관수(K. S. Han),황성호(S. H. Hwang) 유공압건설기계학회 2013 드라이브·컨트롤 Vol.10 No.4
With aggravation of environmental contamination and energy resource exhaustion, Hybrid Electric Vehicles (HEV) that can be economically operated with low fuel consumption are receiving greater attention. For performance improvement of such HEV, the development of efficient transmission can be seen as one of core technologies such as performance of components and driving strategy. Dual clutch transmission (DCT) is actively studied as a transmission type for HEV due to its advantages of having excellent power transmission efficiency based on manual transmission characteristic, resolving the problem of power interruption, and realizing driving convenience of automatic transmission (AT). In this paper, one diesel HEV equipped with 6-Speed DCT, modelled using MATLAB/Simulink, and a performance simulator developed for this vehicle are introduced. Driving simulation with driving cycles such as FTP75 and NYCC was performed using the developed performance simulator, and the simulated results regarding state of charge and fuel economy, when AT and DCT are applied to this diesel hybrid vehicle respectively, are compared. This performance simulator can be utilized to develop a control algorithm for improving the fuel economy of HEV with DCT.
백진주(J. J. Baek),박진현(J. H. Park),이용관(Y. K. Lee),황성호(S. H. Hwang) 유공압건설기계학회 2013 유공압건설기계학회 학술대회논문집 Vol.2013 No.6
Recent Energy exhaustion and environmental issues have brought growing interests in HEV(Hybrid Electric Vehicle), which offers the advantage of low fuel consumption in traffic congestion. In order to improve the performance of these Hybrid Electric Vehicles, the development of effective transmission technology is highly required. Especially many researches already have done on DCT(Dual Clutch Transmission) as the latest technology, which has the excellent power transfer efficiency. DCT solves a problem about the disconnecting problems between engine and manual gearbox and implements the driving convenience of Automatic transmission. this study has modeled a disel hybrid electric vehicle with DCT using MATLAB/Simulink. and the Performance Simulator for 6 Speed DCT-based Hybrid Electric Vehicle. In addition, in order to verify the performance simulator, this study has obtained simulation result by using the FTP72 driving mode. And the results about the diesel hybrid electric vehicle with AT and DCT have been compared SOC and fuel efficiency.