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윤기봉(K.B.Yoon),마영화(Y.W.Ma),김영일(Y.I.Kim),차석주(S.J.Cha),김윤재(Y.J.Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In this paper the causes and mechanisms of the failure of gas turbine compressor blades were analyzed with finite element analysis and surface inspection. An approximate remaining life assessment was performed by deterministic assessment methods based on the results of fatigue crack growth tests and collected mechanical properties data
홍창봉(Hong, Chang Bong),박운정(Park, woon jung),차석주(Cha, Suk Ju) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
The purpose of this study is to propose a frontal crash test methods using Hybrid III 50% dummy and a chest injury criteria to develop safety devices for the elderly. For a feasibility study, safety devices (seat belts, airbags, knee airbag) and noise factors (seat position and collision speed) were determined, the sled tests were conducted using the Taguchi method.
유연체 로터-커플링-블레이드 시스템의 로터 축과 블레이드의 연성 진동에 관한 연구
오병영(Oh, Byung-Young),이선숙(Lee, Sun-Sook),윤형원(Yoon, Hyungwon),차석주(Cha, Seog-Ju),나성수(Na, Sungsoo) 한국소음진동공학회 2005 한국소음진동공학회 논문집 Vol.15 No.9
In this paper, a dynamic model for the rotor shaft-coupling-blade system was developed. The blades are attached to a disk and driven by an electric motor shaft which is flexible in torsion. We assumed that the shaft torsional flexibility was lumped in the flexible coupling which is usually adopted in rotor systems. The Lagrangian approach with the small deformation theory for both blade-bending and shaft-torsional deformations was employed for developing the equation of the motion. The Assumed Modes Method was used for estimating the blade transverse deflection. The numerical results highlight the effects of both structural damping of the system and the torsional stiffness of the flexible coupling to the dynamic response of the blade. The results showed strong coupling between the blade bending and shaft torsional vibrations in the form of inertial nonlinearity, stiffness hardening and softening.