http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
볼 엔드밀링에서의 공구 정렬 오차에 의한 가공면의 이론적인 평가
신영재(Y. J. Shin),박경택(K. T. Park),이종현(J. H. Lee),강병수(B. S. Kang) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
High speed milling process is emerging as an important fabrication process benefits include the ability to fabricate micro and meso-scale parts out of a greater range of materials and with more varied geometry. It also enables the creation of micro and meso-scale molds for injection molding. Factors affecting surface roughness have not been studied in depth for this process. A series of experiments has been conducted in order to begin to characterize the factors affecting surface roughness and determine the range of attainable surface roughness values for the high speed milling process. It has previously been shown that run-out creates a greater problem for the dimensional accuracy of parts created by high speed milling process. And run-out also has a more significant effect on the surface quality of milled parts. The surface roughness traces reveal large peak to valley variations. This run-out is generated by spindle dynamics and tool geometry. In order to investigate the relationship between tool alignment errors and surface roughness the scallop generating mechanism in the ball-end milling with tool alignement errors has been studied and simulated. The results indicate that tool alignment errors have no significant effects on the dimension of scallops in for flat planes.
신영재(Y.J.Shin),W.Soedel(W.Soedel) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
In this study. the equation of motion of the conical coil spring including damping is derived and natural frequencies and mode shapes of the conical coil spring are obtained for some boundary conditions. The response of the system with the conical coil spring is analyzed by using the receptance method. Numerical analyses of the conical coil spring are performed. Characteristics of conical coil spring is discussed for various conditions.<br/>
[진동·소음부문] GOD Method에 의한 코일 스프링의 진동 해석
신영재(Y.J.Shin),홍부표(B.P.Hong),최홍창(H.C.Choi) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this study, vibration analysis of the coil spring is introduced by using Generalized differential Quadrature method and natural frequencies of the coil spring are obtained for some boundary conditions. Numerical analyses of the coil spring are performed. This method for analysis of coil spring has shown accuracy, efficiency in solving the differential equations of motion of the coil spnng
신영재(Y.J.Shin),윤종학(J.H.Yun) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_2
In this study compound planetary gear, which is used for continuously variable transmissions and combined with three planetary gears, is modeled by considering variable nonlinear gear mesh stiffness and damping. The equation of motion of compound planetary gear is derived. Locus of sun gear center causing noise and vibration is being determined by performing state equations with numerical analysis in fourth order Runge-Kutta method.<br/>
김영민(Y. M. Kim),신영재(Y. J. Shin),이응숙(E. S. Lee),김동우(D. W. Kim),이동주(D. J. LEE) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
A new, commercially available polishing process called magnetorheological finishing is used to polish and figure precision optics. To understand and model this process correctly it is important to determine the mechanical properties of the fluid under the influence of the magnetic field. Magnetorheological (MR) fluids are commonly modeled as Bingham fluids, so one of the essential properties to measure is the yield stress. Since MR fluids are inherently anisotropic, the yield stress will depend on the mutual orientation of the magnetic field and the direction of deformation. The relative orientation of the field and deformation in polishing does not coincide with common rheological setups, so a new rheometer has been designed and tested. This new magnetorheometer design has been shown to give correct stresses during calibration experiments using Newtonian fluids with a known viscosity. The measured stress has also been shown to have a magnitude consistent with published finite element approximations for magnetic fluids. The design of the instrument was complicated because of the requirements imposed upon the magnetic field, and the difficulty in satisfying the no slip boundary condition. Our results show the importance of having a homogeneous field in the test region during measurements. The solutions to these problems and discussion of the measurements on nonmagnetic and magnetic fluids are given.