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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),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/>
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/>
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/>
이수열,이정한,이완,문치웅,조민형,Lee, S.Y.,Yi, J.H.,Yi, W.,Mun, C.W.,Cho, M.H. 대한전자공학회 1998 電子工學會論文誌, S Vol.s35 No.5
Bridcage RF coil is one of the most widely used RF coils in MRI. In order to use birdcage RF coils in open MRI systems, an open tructured birdcage RF coil has been investigated. By opening the ring structure of an original birdcage RF coil and driving the coil at two opening ends, the original birdcage RF coil can be modified to an open structured coil. In order to improve magnetic field uniformity of the open birdcage RF coil, driving voltage phases at the two opening ends can be controlled to be in-phase or out-of-phase each other. Operating frequency of the open birdcage RF coil has been theoretically derived, and the theoretical derivation has been verified by experiments.