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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Transactions of the Korean Society of Mechanical Engineers A
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Journal DOI :
The Korean Society of Mechanical Engineers
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Volume & Issues
Volume 21, Issue 12 - Dec 1997
Volume 21, Issue 11 - Nov 1997
Volume 21, Issue 10 - Oct 1997
Volume 21, Issue 9 - Sep 1997
Volume 21, Issue 8 - Aug 1997
Volume 21, Issue 7 - Jul 1997
Volume 21, Issue 6 - Jun 1997
Volume 21, Issue 4 - Apr 1997
Volume 21, Issue 5 - Jan 1997
Volume 21, Issue 3 - Jan 1997
Volume 21, Issue 2 - Jan 1997
Volume 21, Issue 1 - Jan 1997
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A Study on the Kinetodynamic Analysis for General Disk Cam Driving Slider Mechanisms
Shin, Joong-Ho ; Kim, Jong-Soo ; Ha, Kyong-Hoon ;
Transactions of the Korean Society of Mechanical Engineers A, volume 21, issue 6, 1997, Pages 871~883
DOI : 10.22634/KSME-A.19184.108.40.2061
Kinetodynamics of a cam driving slider mechanism consists of kinematic analysis and force analysis. The kinematic analysis is to determine the kinematic characteristics of a cam driving mechanism and a slider mechanism. The force analysis is to determine the joint forces of links, the contact forces of the cam and follower, and the driving torque of a main shaft. This paper proposes a close loop method and a tangent substitution method to formulate the relationships of kinematic chains and to calculate the displacement, velocity and acceleration of the cam driving slider mechanism. Also, and instant velocity center method is proposed to determine the cam shape from the geometric relationships of the cam and the roller follower. For dynamic analysis, the contact force and the driving torque of the cam driving slider mechanism are calculated from the required sliding forces, sliding motion and weight of the slider.
A Study on the Tubular Alumina Liner Subjected to High Pressure and High Temperature
Oh, Je-Hoon ; Lee, Dai-Gil ; Lee, Su-Jeong ; Lee, Jong-Soo ;
Transactions of the Korean Society of Mechanical Engineers A, volume 21, issue 6, 1997, Pages 884~895
DOI : 10.22634/KSME-A.19220.127.116.114
The finite element analysis for the tubular alumina liner which was shrink-fitted into a heat treated high speed steel (HSS) sleeve and subjected to high inner pressure and high temperature was performed. The parameters for the analysis were the interference between the alumina and the HSS, the temperature, the inner pressure, the coefficient of friction between the alumina and the HSS, and the taper at the sleeve ends. From the analysis, it was found that the tensile hoop stresses were decreased when the end parts of the HSS sleeve were tapered and the tensile stresses were decreased as the coefficient of friction between the alumina and the HSS was decreased. Also it was found that the alumina might be used as the structural liner for high pressure and high temperature when it was shrink-fitted into a heat treated HSS sleeve.
Vibration Analysis of the Shaft-duplicate Disk System
Chun, Sang-Bok ; Lee, Chong-Won ;
Transactions of the Korean Society of Mechanical Engineers A, volume 21, issue 6, 1997, Pages 896~906
DOI : 10.22634/KSME-A.1918.104.22.1686
The effect of duplicate flexible disks on the vibrational modes of a flexible rotor system is investigated by using an anlytical method based on the assumed modes method. The rotor model to be analyzed consists of duplicate disks on a flexible shaft. In modeling the system, centrifugal stiffening and disk flexibility effects are taken into account. To demonstrate the effectiveness of the method, a hard disk drive spindle system commonly used in personal computers and a simple flexible rotor system with two disks are selected as examples. In particular, the dynamic coupling between the vibrational modes of the shaft and the duplicate disks is investigated with the shaft rotational speed varied.
Anti-swing of the Nonlinear Overhead Crane Using Partial State Feedback Control
Lee, Jong-Kyu ; Lee, Sang-Ryong ;
Transactions of the Korean Society of Mechanical Engineers A, volume 21, issue 6, 1997, Pages 907~917
DOI : 10.22634/KSME-A.1922.214.171.1247
The purpose of this study is to design an anti-sway motion for industrial overhead cranes which transport objects on a horizontal plane by adjusting movements of a trolley motor and a girder motor. The movement of a hoist motor has not been considered at this time since its role was assumed to move objects only vertically, therefore, not to affect the swing motion of objects. The dynamic behavior of the swing motion shows nonlinear characteristics, which makes the design of anti-sway motion controller difficult. First of all, the nonlinear state equation for the motion of industrial overhead cranes has been derived. Then they have been linearized about normal operating states determined by the dynamic characteristics of motor motion-acceleration, constant speed, and deceleration, and deceleration, during transportation. The partial state feedback control algorithm based on this linearized state equation has been developed on order to suppress the swing motion. The simulation results have demonstrated satisfactory performance of the proposed controller.
A Useful Technique for Measuring the 3-dimensional Positioning of a Rotating Object
Lee, Eung-Seok ; Wi, Hyeon-Gon ; Jeong, Ju-No ;
Transactions of the Korean Society of Mechanical Engineers A, volume 21, issue 6, 1997, Pages 918~924
DOI : 10.22634/KSME-A.19126.96.36.1998
A method for measuring the accuracy of rotating objects was studied. Rotating axis errors are significant; such as the spindle error of a manufacturing machine which results in the surface roughness of machined work pieces. Three capacitance type displacement sensors were used to measure the rotating master ball position. The sensors were mounted to the three orthogonal points on the spindle axis. The measurement data were analyzed and shown for rotating spindle accuracy, not only for average roundness error but also for spindle volumetric positional error during the revolutions. This method is simple and economical for industrial field use with regular inspection of rotating machines using portable equipment. Measuring and analyzing time using this method takes only a couple of hours. This method can also measure microscopic amplitude and 3-dimensional direction of vibrating objects.
Two Node Meridional Strain-based Axisymmetric Shell Elements
Ryu, Ha-Sang ; Sin, Hyo-Chol ;
Transactions of the Korean Society of Mechanical Engineers A, volume 21, issue 6, 1997, Pages 925~932
DOI : 10.22634/KSME-A.19188.8.131.525
Two shear-flexible curved axisymmetric shell elements with two nodes, LCCS(linear curvature and constant strain) and CCCS(constant curvature and constant strain) are designed based on the assumed meridional strain fields and shallow shell geometry. At the element level, meridional curvature, membrane strain and shear strain fields are assumed by using polynomials and the displacement fields are obtained by integrating the assumed strain fields along the shallowly curved meridian. The formulated elements have high order displacement fields consistent with the strain field. Several test problems are given to demonstrate the performance of the two elements. Analysis results obtained reveal that the elements are very accurate in the displacement and the stress predictions.
A Study of Hierarchical Models for the Optimal Analysis of Thin Elastic Structures
Jo, Jin-Rae ;
Transactions of the Korean Society of Mechanical Engineers A, volume 21, issue 6, 1997, Pages 933~941
DOI : 10.22634/KSME-A.19184.108.40.2063
In the analysis of thin elastic structures such as plate and shell-like structures, classical lower-order theories like Kirchhoff and Reissner-Mindin theories are insufficient to describe the behavior of such structures in the region where the state of stresses is complex. On the other hand, the fully three dimensional theory of linear elasticity can provide desired analysis accuracy, but requires expensive computational implementation compared to the classical theories. This paper is concerned with the development of hierarchical models for elastic structures which can be used for hierarchical modeling for the analysis of such structures. Derivation and limit model analysis (when the thickness of structures tends to zero) of hierarchical models are presented together with a introduction of modeling error estimation. Also, numerical results supporting theoretical results are given.
Numerical Calculation of the Far Field Acoustic Pressure from the Unsteady Motion of the Three-dimensional Vortex Filament
Ryu, Ki-Wahn ; Lee, Duck-Joo ;
Transactions of the Korean Society of Mechanical Engineers A, volume 21, issue 6, 1997, Pages 942~950
DOI : 10.22634/KSME-A.19220.127.116.112
Far field acoustic pressure from the evolution and interaction of three-dimensional vortex filament is calculated numerically. A vortex ring is a typical example of the three-dimensional vortex filament. An elliptic vortex ring emits a strong sound signal due to significant distortion and stretching of the vortec filament. The far field acoustic pressure is linearly dependent on the third time derivatives of the vortex positions. A numerical scheme of high resolution is employed to describe in detail the elliptic vortex ring motions which ar highly nonlinear. Descretized vortex filaments are interpolated by using a parametric blending function to remove a possible numerical instability. The distorted vortex filament, owing to the self-induced and the induced velocity from the other vortex segments, is redistributed at each time step. The accuracy and efficiency of the scheme are validated by comparisons with the analytic solution of circular vortex ring interaction.
Estimate of package crack reliabilities on the various parameters using taguchi's method
Kwon, Yong-Su ; Park, Sang-Sun ; Park, Jae-Wan ; Chai, Young-Suck ; Choi, Sung-Ryul ;
Transactions of the Korean Society of Mechanical Engineers A, volume 21, issue 6, 1997, Pages 951~960
DOI : 10.22634/KSME-A.1918.104.22.1681
Package crack caused by the soldering process in the surface mounting plastic package is evaluated by applying the maximum energy release rate criterion. It could be shown that the crack propagation from the lower edge of the ie pad is easily occurred at the maximum temperature during the soldering process, where the pressure acting on the crack surface is assumed by the saturated vapor pressure at maximum temperature. The package crack formation depends on various parameters such as chip size, relative thickness, material properties, the moisture content and soldering temperature etc. The quantitative measure of the effects of the parameters could be easily obtained by using the taguchi's method which requires only a few kinds of combinations with such parameters. From the results, it could be obtained that the more significant parameters to effect the package reliability are the orders of Young's modulus, die pad size, down set, chip thickness and maximum soldering temperature.
Modeling of Billet Shape in Spray Forming Process
Jang, Dong-Hun ; Gang, Sin-Il ; Lee, Eon-Sik ;
Transactions of the Korean Society of Mechanical Engineers A, volume 21, issue 6, 1997, Pages 961~970
DOI : 10.22634/KSME-A.1922.214.171.1241
A numerical method is presented to predict and analyze the shape of a growing billet produced from the "spray forming process" which is a fairly new near-net shape manufacturing process. It is important to understand the mechanism of billet growing because one can obtain a billet with the desired final shape without secondary operations by accurate control of the billet shape, and it can also serve as a base for heat transfer and deformation analysis. The shape of a growing billet is determined by the flow rate of the alloy melt, the mode of nozzle scanning which is due to cam profile, the initial positio of the spray nozzle, scanning angle, and the withdrawal speed of the substrate. In the present study, a theoretical model is first established to predict the shape of the billet and next the effects of the most dominent processing conditions, such as withdrawal speed of the substrate and the cam profile, on the shape of the growing billet are studied. Process conditions are obtained to produce a billet with uniform diameter and flat top surface, and an ASP30 high speed steel billet is manufactured using the same process conditions established from the simulation.imulation.
Analysis of a Composite Panel with Transverse Matrix Cracks under Bending and Twisting Moments
Park, Jung-Sun ; Hur, Hae-Kyu ; Lee, Soo-Yong ;
Transactions of the Korean Society of Mechanical Engineers A, volume 21, issue 6, 1997, Pages 971~980
DOI : 10.22634/KSME-A.19126.96.36.1991
This study is to investigate the stiffness degradation of a composite laminated panel including transverse matrix cracks subjected to bending and twisting moments. Micromechanics theory on the composite material is derived by introducing crack density. Iterative numerical scheme is developed to calculate the degraded composite stiffness which has nonlinear relation due to the crack density. The finite element method is used for structural analysis of the composite panel. Structural responses of the composite panel are examined for various laminated angles and crack density under the bending and twisting moments. Also, the effect of crack opening and closing is considered in the examination. It is realized that the matrix cracks may cause severe stiffness reduction and should be considered in the composite laminated panel.
A Study on the Determination of the Principal Coordinate System of Composite Rotor Blade having Arbitrary Cross Section
Yu, Yong-Seok ; Choe, Myeong-Jin ; O, Taek-Yeol ;
Transactions of the Korean Society of Mechanical Engineers A, volume 21, issue 6, 1997, Pages 981~987
DOI : 10.22634/KSME-A.19188.8.131.521
Modern helicopter rotor blades with non-homogeneous cross section composed of anisotropic material rquire highly sophisticated structural analysis. Variation in cross section geometry makes this task of analysis more complicated. Since rotor blades generally are much longer than their lateral dimensions, one-dimensional models seem feasible, at least from a computational point of view. Therefore determination of the principal coordinate system is very important to remove the structural coupling for one-dimensional beam modelling. In this study, shear center, and principal direction. The method will be verified by comparing the results with confirmed experimental results.
A Study on the Tool Fracture Detection Algorithm Using System Identification
Sa, Seung-Yun ; Yu, Eun-Lee ; Ryu, Bong-Hwan ;
Transactions of the Korean Society of Mechanical Engineers A, volume 21, issue 6, 1997, Pages 988~994
DOI : 10.22634/KSME-A.19184.108.40.2068
The demands for robotic and automatic system are continually increasing in manufacturing fields. There have been many studies to monitor and predict the system, but they have mainly focused upon measuring cutting force, and current of motor spindle, and upon using acoustic sensor, etc. In this study, digital image of time series sequence was acquired by taking advantage of optical technique. Mean square error was obtained from it and was available for useful observation data. The parameter was estimated using PAA(parameter adaptation algorithm) from observation data. AR(auto regressive) model was selected for system model and fifth order was decided according to parameter estimation. Uncorrelation test was also carried out to verify convergence of parameter. Through the proceedings, it was found that there was a system stability.
Ultra-precision Positioning By Using Coherence of White Light
Park, Hyun-Goo ; Kang, Min-Gu ; Kim, Seung-Woo ;
Transactions of the Korean Society of Mechanical Engineers A, volume 21, issue 6, 1997, Pages 995~1001
DOI : 10.22634/KSME-A.19220.127.116.115
In this paper, a new positioning method with incoherence of white light is described and practically implemented to attach VCR heads on a drum very accurately. This method utilizes the Michelson Interferometer which uses white light with short coherence length as the light source to generate interference fringes only in case the optical path difference is shorter than about 2.mu.m. The course position of VCR heads and the fine are determined by appearance and visibility of interference fringes, respectively. The appearance are detected by an image processing technique using FFT(Fast Fourier Transform).
Machinability of Presintered
Kim, Sung-Chung ; Lee, Jae-Woo ;
Transactions of the Korean Society of Mechanical Engineers A, volume 21, issue 6, 1997, Pages 1002~1012
DOI : 10.22634/KSME-A.1918.104.22.1682
When the presintered ceramics are machined with ceramic tool, the tool life becomes extremely short. The CBN tool exhibits the best performance in dry machining of the ceramics presintered at
among all cutting tests. The roughness of the machined surface of the ceramics presintered below
is smaller than that of the ceramics presintered at
While the performance of the cemented carbide and CBN tools is better in dry than in wet machining, the diamond tool shows adverse tendency. The tool life is not affected by the feed rate and depth of cut. During the following full-sintering after the machining of the presintered ceramics, the surface roughness decreases up to 62%. The finished surface in machining the presintered ceramics is much better than that in machining the full-sintered ceramic.