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트랜스미션 기어용 소재의 열처리 조건에 따른 마멸특성 평가
박재상(J. S. Park),저성재(S. J. Jun),조연상(Y. S. Cho),김동호(D. H. Kim),박흥식(H. S. Park) 한국트라이볼로지학회 2003 한국트라이볼로지학회 학술대회 Vol.36 No.-
The SCM420 used mainly to automobile transmission gear has problems that it costs transmission gear maker much money in carburizing treatment. For this, it needs new transmission gear material and surface modification alternating the existing material and heat treatment. And in order to evaluate the wear resistance of two transmission gear materials, it was carried out a friction and wear experiment according to sliding speed and applied load with carburising SCM420 and nitrocarburising NT100. The wear volume was calculated and 'presumed with the image processing system to apply to damage diagnosis of gear system in automobile transmission. The results show that nitrocarburising NT100 has a distinguished wear resistance than carburising SCM420.
유압 피스톤 모터용 습동재료의 마찰상태 추정에 관한 연구
박재상(J.S. Park),조연상(Y.S. Cho),박흥식(H.S. Park) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.10
The morphologies of the wear debris are directly indicative of wear processes occuring in machinery and their severity. The neural net work was applied to identify friction condition from the lubricated moving system. The four parameter (50% volumetric diameter, aspect, roundness and reflectivity) of wear debris are used as inputs to the network and learned the friction. It is shown that identification results depend on the ranges of these shape parameter learned. The three kinds of the wear debris had a different patten characteristic and recognized the friction condition and materials very well by neural net work. We dicuss between the characteristic of wear debris and the friction coefficient and how the network determines difference in wear debris feature.
HART Ⅱ 로터-동체 모델의 CFD/CSD 연계해석과 동체효과 분석
사정환(J.H. Sa),유영현(Y.H. You),박재상(J.S. Park),박수형(S.H. Park),정성남(S.N. Jung),유영훈(Y.H. Yu) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.5
A loosely coupling method is adopted to combine a computational fluid dynamics (CFD) solver and the comprehensive structural dynamics (CSD) code, CAMRAD Ⅱ, in a systematic manner to correlate the airloads, vortex trajectories, blade motions, and structural loads of the HART Ⅱ rotor in descending flight condition. A three-dimensional compressible Navier-Stokes solver, KFLOW, using chimera overlapped grids has been used to simulate unsteady flow phenomena over helicopter rotor blades. The number of grids used in the CFD computation is about 24 million for the isolated rotor and about 37.6 million for the rotor-fuselage configuration while keeping the background grid spacing identical as 10% blade chord length. The prediction of blade airloads is compared with the experimental data. The current method predicts reasonably well the BVI phenomena of blade airloads. The vortices generated from the fuselage have an influence on airloads in the 1st and 4th quadrants of rotor disk. It appeared that presence of the pylon cylinder resulted in complex turbulent flow field behind the hub center.
허다경(D. G. Heo),박재상(J. S. Park),김동욱(D. U. Kim),황재호(J. H. Hwang),박성호(S. H. Park),도용태(Y. T. Do),송병섭(B. S. Song) 한국재활복지공학회 2014 한국재활복지공학회 학술대회논문집 Vol.2014 No.11
In this paper, we propose an image-to-audio conversion system which enables the people who are isolated from knowledge information (such as those disabled, old, or infirm) to easily access the information. The proposed system consists of a hand scanner for acquiring documental information, a smart phone for data transmission, TTS(Text to Speech), and interfacing, and a server for OCR(Optical Character Recognition). Our system can be built with a relatively low cost because it employs a smart phone and a server rather than building a stand-alone system which has its own processing unit. In addition, the system is easy to carry as it uses a hand scanner. We considered the physical limitations of the infirm when designing the system interface. The system was tested with specially made booklet where various colors and fonts were printed. Experimental results indicate that black and red characters show less recognition error in different printing resolutions and scanning methods(color or mono). The use of a hand scanner however brought inconsistent performance depending on scanning angle and hand shaking. We discuss further development and improvement issues in the conclusion part of this paper.