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[論文] 移動荷重과 軸荷重이 作用하는 柔軟한 基礎위에 支持된 無限보의 動特性
홍동표(D. P. Hong),김광식(K. S. Kim) 한국자동차공학회 1982 오토저널 Vol.4 No.3
This paper presents analytic solutions of deflection and their resonance diagrams for a uniform beam ofinfinite length subjected to an comstant axial force and moving transverse load simultaneously.<br/> Steady solutions are obtained by a time-independent coordinate moving with the load. The supporting foundation includes damping effects.<br/> The influences of the axial force, the damping coefficient and the load velocity on the beam response are studied.<br/> The limiting cases of no damping and critical damping are also investigated.<br/> The profdes of the deflection of the beam are shown graphically for several values of the load speed, the axial force and damping parameters.<br/> Form the results, following conclusions have been reached.<br/> 1. The critical velocity θcr decreases as the axial compressive force increases, but increases as the axial tensile force increases.<br/> 2. At the critical velocity θcr the deflection have a tendency to decrease as the axial tensile force increases and to increase gradually as the axial compressive force increases.<br/> 3. In case of relatively small dampings, the deflection increases suddenly as the velocity of the moving load approaches the critical velocity, and it reachs its maximum at the critical velocity, and it decreases and become greatly affected by the axial force as the velocity increases further.<br/> 4. In case of relatively large dampings, as the velocity increases the deflection decreases gradually and it is affected little by the axial load.
클러치 비틀림특성에 의한 자동차 수동변속기 치타음에 관한 연구
홍동표(D. P. Hong),정태진(T. J. Chung),태신호(S. H. Tae) 한국자동차공학회 1995 한국 자동차공학회논문집 Vol.3 No.3
Rattle noise occurs at manual transmission as idling and driving of a automotive. It can be solved by torsional characteristics of a clutch disc. A clutch disc consist of a region of pre-damper and main-damper. Rattle noise is affected by pre-damper and main-damper equipped for a torsional spring and friction washer. Pre-damper range covers noise radiating from manual transmission when engine is idling and main-damper range covers noise when engine is driving. The aim of this reserch is to clear transmission rattle noise by way of torsional characteristics of a clutch disc. The experiment is carried out as idling and driving of a automobile equipped for 1.5L MPI engine, dry single-disc type clutch and manual transmission. In this study, the results show for a vibration of manual transmission as idling and driving can be cleared by a clutch disc of Pre-damper type.
자동차 공회전시 기어래틀과 클러치 비틀림특성에 대한 연구
홍동표(D. P. Hong),정태진(T. J. Chung),태신호(S. H. Tae) 한국자동차공학회 1995 한국 자동차공학회논문집 Vol.3 No.2
Gear rattle is a source of vibration and noise in automotive gearbox casing and generally occurs at or near system resonant frequencies. The neutral gear rattle of the gearbox. is affected by the stiffness and hysteresis torque in the clutch disk and drag torque determining balancing point of the clutch disk operating range. The experiment is carried out in the pre-damper type clutch and a manual transmission of a automobile equipped for inline four-cylinder four-cycle 1.5L MPI engine and the computer simulation is executed by 5th order Runge-Kutta method. The results of the simulation analysis and experimental studies show the dynamic behavior of clutch and a phenomenon of the neutral gear rattle with respect to drag torque and torsional characteristics of the clutch.
홍동표(D. P. Hong),이성철(S. C. Lee),양성모(S. M. Yang),장일도(L. D. Chang),안병민(B. M. Ahn) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_1
The main torsional vibration source of the driveline is the fluctuation of the engine torque. The gear rattle is impacts generating in the backlash of the free gear due to this torsional vibration. Optimization of the clutch torsional characteristic is one of the effective methods to reduce the idle gear rattle. Many researches have been reported on this problem but only few of them give sufficient consideration to the clutch design parameters and drag torque.<br/> This paper pays attention to the clutch design parameter, drag torque, gear backlash and fluctuation of engine torque to reduce the idle gear rattle with, computer simulation.<br/>
마찰을 고려한 동력전달계의 Stick-slip 현상에 관한 연구
윤영진(Y. J. Youn),홍동표(D. P. Hong),정태진(T. J. Chung) 한국자동차공학회 1995 한국 자동차공학회논문집 Vol.3 No.4
This paper discusses the stick-slip phenomenon of the driveline system of a vehicle in consideration of friction. Friction is operated on the between of flywheel and clutch disk. The expressions for obtaining the results have been derived from the equation of motion of a three degree of freedom frictional torsion vibration system which is made up driving part(engine, flywheel), driven part(clutch, transmission) and dynamic load part(vehicle body) by applying forth-order Runge-kutta method. It was found that the great affect parameters of the stick-slip or stick motion were surface pressure force between flywheel and clutch disk, time decay parameter of surface pressure force and 1st torsional spring constant of clutch disk when driveline system had been affected by friction force.<br/> The results of this study can be used as basic design data of the clutch system for the ride quality improvement of a car.