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류윤선,조희복,김사수 한국소음진동공학회 1997 소음 진동 Vol.7 No.6
Corrugation of railway track can be caused by the various dynamic behaviors of traveling wheels and track. In this paper, the coupled vibrations of traveling wheel and railway track are analyzed as the cause of corrugations. To analyze the coupled vibration, the track supported by the sleepers and the traveling wheels are identified to the elastically supported infinite beam and the spring-mass system which runs at constant speed. The Hertzian contact spring is considered between the infinite beam and spring-mass system are calculated. The cause and development of rail corrugation are discussed in the view point of contact force fluctuation affected by the elastic supports and the corrugated surface profile on the track. By the obtained results, the possibilities of resonance are checked between the excitation by the corrugated surface profile and the natural frequency of contact spring-mass system. It may be thought to a development of railway corrugation.
[論文] 平板內의 直線 Crack tip 에서의 應力擴大係數에 關한 硏究
조선휘,조희복 한국자동차공학회 1982 오토저널 Vol.4 No.1
In this paper, the stress intensity factors at the crack tips in a finite plate having a straight crack with arbitrary lengths and directions are analyzed by means of Boundary Collocation<br/> Method in Cartesian coordinates under the following two cases.<br/> A) Case of only considering stress components at the boundary collocation points<br/> B) Case of considering the stress resultant at the boundary, in addition to case of (A) and analyzed by means of F. E. M.<br/> To certify the Boundary Collooation Method, the solutions of B. C. M. are compared with the solutions of F. E. M. and M.lsida on the infinite plate.<br/> Consequently, B. C. M. demonstrates the simplicity of input data preparation and the reduction of cpu time against F. E.. M.
[동력전단계부문] CVT 변속동역학을 고려한 라인 압력 및 변속비 제어 밸브의 응답 특성 해석
정근수(K.S.Jung),김달철(T.C.Kim),이희라(H.R.Lee),김현수(H.S.Kim),이재신(J.S.Lee),조희복(H.B.Cho) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Dynamic models of line regulator valve(LRV) and ratio control valve(RCV) are obtained for an electronic controlled CVT. LRV and RCV are operated by variable force solenoid (VFSL Considering the CVT shift dynamics. oil pump's efficiency and saturation characteristics of VFS. simulations are performed and compared with test results. Simulation results are in good agreement with the experiments ‘ which shows the validity of the dynamic models of LRV and RCV obtained. In addition. the effects of the orifice size in the exhaust port of RCV are investigated. Simulation results show that as the orifice size decreases. the residual pressure in the primary actuator increases which insures the large torque transmission capacity. meanwhile the duration time for the downshift increases.