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천길정,이정한,한동철,Cheon, G.J,Lee, J.H,Han, D.C 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.5
Decision process for length dimension in the mechanical system design process has been studied with a washing machine transmission as a model. The results are, (i) the length dimensions of the non-shaft elements are independent of other elements, (ii) the length dimensions of the shaft elements are dependent on the dimensions of the non-shaft elements located inside and outside of that elements, (iii) the length dimensions of the inner shaft elements are dependent on those of the outer shaft elements located parallel, (iv) the length dimensions of the shaft elements located serial are independent of each other.
이정한(J.H.Lee),천길정(G.J.Cheon),김주호(J.H.Kim),김충(C.Kim),한동철(D.C.Han),명제형(J.H.Myung),정태형(T.H.Jeong) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
An experiment for measuring dynamic characteristics of the planetary gear trains has been carried out using a power circulating type test rig. The measured parameters are strains of the planet gear shaft, carrier displacements, as well as the torques of the input and output shafts. Frequency analysis was executed for the carrier displacement
이정한(J.H.Lee),천길정(G.J.Cheon),김주호(J.H.Kim),김충(C.Kim),한동철(D.C.Han),명제형(J.H.Myung),정태형(T.H.Jeong) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_1
Gear train system test rig of power circulating type was fabricated, and systematic experiment for measuring quasi-static characteristics of the planetary gear trains has been carried out using the test rig. The measured parameters are fillet strains of the sun gear and ring gear, carrier displacements, torques of the input and output shafts. The results are as follows : i) Even the loading torque is constant, torque variations of the input and output shafts are observed, ii) It has two components of frequency, low frequency of the input shaft rotation frequency and high frequency of the tooth meshing frequency, iii) The variations of the fillet strains of the sun and ring gear have the same tendency as that of the torques, iv) The loci of the carrier is so stable, and have relation with the shaft torque, v) The amplitude of the loci decrease and its shape becomes so simple as rotational speed increases. but this tendency is contrary as with the torque.<br/> <br/>
이정한(J.H.Lee),류형태(H.T.Ryu),천길정(G.J.Cheon),김주호(J.H.Kim),한동철(D.C.Han) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
Dynamic analysis on a star type epicyclic gear train supported with joural bearing has been carried out. The loci of the planet gear, sun gear, and ring gear have been analized. Forces acting on the gear surface has also been analized.<br/>
명재형(J.H.Myong),조영일(Y.I.Cho),정태형(T.H.Chong),천길정(G.J.Cheon),한동철(D.C.Han) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2
Planetary gear train is more compact in form and endures larger transmission power than other gear systems. The usability is increased in that the mesh is full and constant, and thus it is necessary to study for the design of planetary gear train. In this paper, we have developed the planetary gear train design system which determines gear dimensions such as module, teeth number, helix angle, facewidth, profile modification coefficients. The dimensions is calculated by using optimization technique to minimize the volume of the gear train and satisfy design constraints which include gear strength, interference, etc.
기어의 강성변화를 고려한 유성기어열의 동특성 해석 연구
김충(C. Kim),김주호(J.H. Kim),이정한(J.H. Lee),조영일(Y.I. Cho),천길정(G.J. Cheon),정태형(T.H. Jeong),한동철(D.C. Han) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_1
Dynamic characteristics of planetary gear train (PGT) of vehicle transmission is investigated. Engine torque is transfered by transmission, which is composed of torque converter, cutches and several PGTs. The load from torque converter fluctuate irregularly, so the dynamic force on gear tooth varies nonlinearly. For dynamic analysis, stiffness of gear teeth is calculated according to variation of contact ratio. Static and dynamic model for one stage PGT are suggested, and analyzed by 4th Runge- Kutta method. The results show that the locus of sun gear and dynamic force decrease and the frequency effect of external load is decrease as rotational speed increases.<br/>
김충(C. Kim),김주호(J.H. Kim),천길정(G.J. Cheon),정태형(T.H. Jeong),한동철(D.C. Han) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
Dynamic behavior of planetary gear train for automatic transmission is investigated. Gear meshes are modelled as springs and dampers varying with time. Rolling bearings supporting planet gears are modelled as radial springs. Carrier center locus and dynamic forces acting on gear meshes and supporting bearings are calculated after numerical integration of governing equations. Dynamic behavior is very different from what we know from static analysis. The results show that carrier center locus and shape of forces become simple as rotating speed is increased and that force acting on sun/planet gear mesh is different from force acting on planer/ring gear mesh. Finally, maximun gear mesh load graph can be made out of above result.<br/>
정태형(T.H.Chong),명재형(J.H.Myong),천길정(G.J.Cheon),한동철(D.C.Han) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_2
The vibration and noise of gears is due to the vibrational exciting force caused by the tooth stiffness which changes periodically as the mesh of teeth proceeds and by the transmission error, that is, the rotation delay between driving gear and driven gear caused by manufacturing error and alignment error in assembly and so on. The vibrational exciting force between ring gear and planet gear is smaller than that between sun gear and planet gear in the planetary gear train with the thin-rimmed gear. The purpose of this study is to develop how to calculate the optimum amounts of tooth profile modification, by minimizing the vibrational exciting force of sun-planet gears. The proposed method can calculate the optimum amounts of tooth profile modification automatically and is to be utilized to resolve the problem of vibration of planetary gear tarin.<br/>
천길정 원광대학교 생산 및 자동화기술연구소 1994 생산.자동화기술연구소논문집 : 원광대 Vol.- No.1
An analysis of the dynamics in the closing phase of the occluder of a mechanical monoleaflet heart valve prosthesis is presented. The backflow velocity of the fluid was computed by applying the continuity. Bernoulli's and momentum equations in the unsteady state. By considering the fluid pressure and gravity as external forces acting on the occluder, the moment equlilibrium on the occluder was employed to analyze the motion of the occluder during closing and the impact force between the occluder and the guiding struts.