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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
Journal Basic Information
Journal DOI :
The Korean Society of Mechanical Engineers
Editor in Chief :
Volume & Issues
Volume 25, Issue 12 - Dec 2001
Volume 25, Issue 11 - Nov 2001
Volume 25, Issue 10 - Oct 2001
Volume 25, Issue 9 - Sep 2001
Volume 25, Issue 8 - Aug 2001
Volume 25, Issue 7 - Jul 2001
Volume 25, Issue 6 - Jun 2001
Volume 25, Issue 5 - May 2001
Volume 25, Issue 4 - Apr 2001
Volume 25, Issue 3 - Mar 2001
Volume 25, Issue 2 - Feb 2001
Volume 25, Issue 1 - Jan 2001
Selecting the target year
A method for Simplified and Equivalent Finite Element Modeling Using Optimization Technique
Lee, Gwang-Won ; Seok, Il-U ; Park, Gyeong-Jin ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 1, 2001, Pages 1~10
DOI : 10.22634/KSME-A.2001.25.1.1
As computer power is increased, refined finite element models are employed for structural analysis. However, it is difficult and expensive to use refined models in the design stage. The refined models especially cause problems in the preliminary design where the design is frequently changed. Therefore, simplified models are needed. The simplification process is regarded as an empirical technique. Simplified and equivalent finite element model of a structure has been studied and used in the preliminary design. A general approach to establish the simplified and equivalent model is presented. The generated simple model has satisfactory correlation with the corresponding refined finite element model. An optimization method, the Goal Programming algorithm is used to make the simple model. The simplified model is used for the design change and the changed design is recovered onto the original design. The presented method was verified with three examples.
Design and Strength Evaluation of an Anodically Bonded Pressurized Cavity Array for Wafer-Level MEMS Packaging
Gang, Tae-Gu ; Jo, Yeong-Ho ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 1, 2001, Pages 11~15
DOI : 10.22634/KSME-A.2001.25.1.11
We present the design and strength evaluation of an anodically bonded pressurized cavity array, based on the energy release rate measured from the anodically bonded plates of two dissimilar materials. From a theoretical analysis, a simple fracture mechanics model of the pressurized cavity array has been developed. The energy release rate (ERR) of the bonded cavity with an infinite bonding length has been derived in terms of cavity pressure, cavity size, bonding length, plate size and material properties. The ERR with a finite bonding length has been evaluated from the finite element analysis performed for varying cavity and plate sizes. It is found that, for an inter-cavity bonding length greater than the half of the cavity length, the bonding strength of cavity array approaches to that of the infinite plate. For a shorter bonding length, however, the bonding strength of the cavity array is monotonically decreased with the ratio of the bonding length to the cavity length. The critical ERR of 6.21J/㎡ has been measured from anodically bonded silicon-glass plates. A set of critical pressure curves has been generated for varying cavity array sizes, and a design method of the pressurized cavity array has been developed for the failure-free wafer-level packaging of MEMS devices.
Electromagnetic Microactuators with the Electroplated Planar Coil Driven by Radial Magnetic Field
Ryu, Ji-Cheol ; Gang, Tae-Gu ; Jo, Yeong-Ho ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 1, 2001, Pages 16~24
DOI : 10.22634/KSME-A.2001.25.1.16
This paper presents an electromagnetic microactuator using the copper coil electroplated on the p+silicon diaphragm. The microactuator generates a vertical motion of the diaphragm using the radial direction, we propose a new actuator structure with twin magnets. The microactuator field in the radial direction, we propose a new actuator structure with twin magnets. The microactator shows a values of resonant frequency and quality factor in the ranges of 10.51
0.22kHz and 46.6
3.3, respectively. The twin magnet microactuator generates the maximum peak-to-peak amplitude of 4.4
for the AC rms current of 26.8mA, showing 2.4 times larger amplitude than the single magnet microactuator.
Evaluation of Elastic Modulus in a Particulate Reinforced Composite by Shape Memory Effect
Kim, Hong-Geon ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 1, 2001, Pages 25~31
DOI : 10.22634/KSME-A.2001.25.1.25
The theoretical modeling to predict the modulus of elasticity by the shape memory effect of dispersed particles in a metal matrix composite was studied. The modeling approach is based on the Eshelbys equivalent inclusion method and Mori-Tanakas mean field theory. The calculation was performed on the TiNi particle dispersed Al metal matrix composites(PDMMC) with varying volume fractions and prestrains of the particle. It was found that the prestrain has no effect on the Yonugs modulus of PDMMC but the volume fraction does affects it. This approach has an advantage of definite control of Youngs modulus in PDMMCs.
Approximate Synthesis of 5-SS Multi Link Suspension Systems for Steering Motion
Kim, Seon-Pyeong ; Sim, Jae-Gyeong ; An, Byeong-Ui ; Lee, Eon-Gu ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 1, 2001, Pages 32~38
DOI : 10.22634/KSME-A.2001.25.1.32
This paper presents an approximate synthesis of 5-SS multi link suspension for 2 D.O.F motions. In the proposed synthesis method, alteration curves of camber, toe, kingpin and caster angles are optimized during the bump rebound and the steering motions. And joint positions can be located within desired boundari es. Especially, steering motions are considered for control of kingpin offset and caster trail. Prescribed motions contain both wheel center positions and imaginary kingpin axes in the multi link type suspension. Constraint equations are formulated with di splacement matrix and velocity matrix using instantaneous screw axis.
A Study on Automatic Generation for 3-Dimensional Geometry of Cylindrical Gear and Hob
Jeong, Tae-Hyeong ; Ha, Yeong-Uk ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 1, 2001, Pages 39~46
DOI : 10.22634/KSME-A.2001.25.1.39
When designing a gear, designers determine basic dimensions of a gear with transmitted power considering strength, interference and so on. But, designers can not easily obtain the tooth profile generated by dimensions as well as the geometry of generating hob for cutting the tooth profile. In order to resolve these problems, an automatic design system creating not only the solid model of a gear but also that of the generating hob using the design parameters of dimensions is developed. Through the developed system, designers system, designers can improve the efficiency of design and satisfy the variable requirements of design as well. In this research, the three-dimensional solid models for spur and helical gears are generated considering the design parameters. Besides, those for generating hob regarding the design parameters of hob is created automatically. The system is developed by using Visual Basic and its three-dimensional geometric modeling module is constructed by using SolidWorks.
A Study of a New Precision Finishing Process for Inside Surface of Silicon Nitride Fine Ceramic Pipe by Application of Magnetic Abrasive Machining
Park, Won-Gyu ; Shinmura, Takeo ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 1, 2001, Pages 47~53
DOI : 10.22634/KSME-A.2001.25.1.47
Results ar presented of a new process for internal precision finishing of slender fine ceramic pipes using a magnetic field generated by a permanent magnets. For finishing the interior surface of a long pipe, a new type of finishing equipment was developed which can be very easily used in an industrial surrounding. In general, the pipe is so slender that a conventional finishing tool is hardly inserted into the pipe deeply, being impossible to finish. Therefore, a new technology has been considered to finish inside of a slender ceramic pipe by a simple technique. In this experimental, Magnetic Abrasive Machining is applied for the inner surface of silicon nitride fine ceramic pipe using ferromagnetic particles mixed with chromium-oxide powder. It is shown the initial roughness of 2.6㎛ Ry(0.42㎛ Ra) in the inside surface can be precisely finished to the roughness of 0.1㎛ Ry(0.01㎛ Ra). This paper discusses the outline of the processing by the application of magnetic abrasive machining and a few finishing characteristics.
The Characteristics of Mechanical Properties and Fatigue Crack Propagation of Fire Resistance Steel for Frame Structure
Kim, Hyeon-Su ; Nam, Gi-U ; Gang, Chang-Ryong ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 1, 2001, Pages 54~60
DOI : 10.22634/KSME-A.2001.25.1.54
This study is to investigate the mechanical properties and the fatigue crack propagation of fire resistance steel for frame structure as the chemical composition was changed by addition of N, B and rolled end temperature was varied. We used two kinds of specimen, the one is parallel and the other is perpendicular to the rolling directions. As rolled end temperature increased, volume fraction of ferrite and pearlite decreased, but volume fraction of baintie and grain size increased. Micro-hardness decreased as rolled end temperature increased, but tensile and yield strength increased. Volume fraction of ferrite and pearlite decreased by addition of N. But volume fraction of bainite, tensile and yield strength increased. Microstructure was changed to martensite by addition of B, and tensile and yield strength increased. Fatigue life of TL direction specimen was shorter than that of LT direction specimen. There was no significant effect to fatigue crack propagation rate by addition of N and changing rolling condition, but fatigue life was increased by addition of B.
A Study on the Fracture Behavior of a Two Dimensional Crack in Gas Pipelines Considering Constraint Effects
Sim, Do-Jun ; Jang, Yeong-Gyun ; Choe, Jae-Bung ; Kim, Yeong-Jin ; Kim, Cheol-Man ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 1, 2001, Pages 61~69
DOI : 10.22634/KSME-A.2001.25.1.61
EFP(Fitness For Purpose) type defect assessment methodologies based on ECA(Engineering Critical Analysis) have been established and are in use for the structural integrity evaluation of gas pipelines. ECA usually includes the fracture mechanics analysis, and it is assumed that the J-integral uniquely characterizes the crack-tip stress-strain field. However, it has been proven that the J-integral alone can not be sufficient to characterize the crack-tip field under low levels of constraint with a single parameter. Since pipeline structures are made of ductile material, locally loaded in tension, cracks may experience low level of constraint, and therefore, J-dominance will be lost. For this reason, the level of constraint must be quantified to establish a precise assessment procedure for pipeline defects. The objective of this paper is to investigate the fracture behavior of a crack in gas pipeline(KS D 3507) by quantifying the level of constraint. For this purpose, tensile tests and CTOD tests were performed at room temperature(24
) and low temperature(-40
) to obtain the material properties. J-Q analyses were performed for SENB and SENT specimens based on 2-D finite element analyses, in order to investigate the in-plane constraint effects on pipeline defects. For precise assessment of cracks, especially shallow cracks, in KS D 3507 pipeline, constraint effect must be considered.
Study on Shape Design Method of Cycloidal Plate Gear
Sin, Jung-Ho ; Yun, Ho-Eop ; Gang, Dong-U ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 1, 2001, Pages 70~80
DOI : 10.22634/KSME-A.2001.25.1.70
A cycloid reducer is one of the rotational velocity reduction equipments of machinery. It has advantages of the higher reduction ratio, the higher accuracy, the easier adjustment of transmission ratio and the smaller workspace than other kinds of reducer. A cycloidal plate gear is a main part of the cycloid reducer. Its tooth shape is peculiar because of gearing with the roller gear that has the several rollers on the circular line. And then it can be designed to contact all teeth to rollers. So, the cycloid reducer has the good characteristics in the dynamic properties and the zero-backlash in the contact motion. It can be used in robots, high-precision machines and high capacity machinery. This paper proposes a new approach for the shape design of the cycloidal plate gear and presents a Computer-Aided-Design program developed by the proposed method. The first part of this paper defines the two types of the cycloid reducers and explains their mechanisms. The second part defines the instant velocity centers for each type of the cycloid reducers and calculates the contact angles and the contact points by using te geometric relationships and the kinematical properties of the reducers. The third part generates the full shape of the cycloidal plate gear by the coordinate transformation technique. Finally, this paper presents two examples for the shape design of the cycloidal plate gear in order to prove the theory of the proposed method in this paper and the accuracy of the \"CycloGear Designer\".
Evaluation of Local Allowable Wall Thickness of Thinned Pipe Subjected to Internal Pressure and Bending Moment
Kim, Jin-Won ; Park, Chi-Yong ; Kim, Beom-Nyeon ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 1, 2001, Pages 81~88
DOI : 10.22634/KSME-A.2001.25.1.81
This study proposed an analytical method to evaluate a local allowable wall thickness (LAWT) for locally thinned pipe subjected to internal pressure and bending moment. In this method, the stresses in the thinned region were calculated by finite element analysis and plastic collapse was applied as a failure criterion of thinned pipe. Using this method, LAWT for a simplified thinned pipe was evaluated with variation in axial extent of thinned area, and it was compared with allowable wall thickness provided by previous pipe wall thickness criteria. The results showed that the LAWT was lower, about 50%, than that calculated by construction code or ASME Code N-597, and it was higher, about 2 times, than that estimated by evaluation model based on pipe experiments. In addition, LAWT was decreased with increasing axial extent of thinned area and saturated with further increase in axial extent. And, the variation in LAWT with axial extent of thinned area depended on type of load, especially a magnitude of bending moment, considering in the evaluation.
Development of Anthropomorphic Robotic Joint
Ryu, Seong-Mu ; Baek, Sang-Hun ; Choe, Hyeok-Ryeol ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 1, 2001, Pages 89~97
DOI : 10.22634/KSME-A.2001.25.1.89
In this paper, we present a new two-dof anthropomorphic joint mechanism that enables to mimic the humanlike motion. The proposed mechanism, called Double Active Universal Joint(DAUJ), generates a two-dof swivel motion without rolling by the coupled motion of two independent motor. In addition, we perform basic experiments to confirm the effectiveness of the proposed mechanism and the results are reported.
Collapse Characteristics on Width Ratio and Flange Spot-Weld Pitch for Hat-Shaped Members
Cha, Cheon-Seok ; Gang, Jong-Yeop ; Kim, Yeong-Nam ; Kim, Jeong-Ho ; Kim, Seon-Gyu ; Yang, In-Yeong ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 1, 2001, Pages 98~105
DOI : 10.22634/KSME-A.2001.25.1.98
The fundamental and widely used spot welded sections of automobiles (hat and double hat-shaped section members) absorb most of the energy in a front-end collision. The sections were tested on axial static(10mm/min) and quasi-static(1000mm/min) loads. Based on these test results, specimens with various thickness, shape and spot weld pitch on the flange have been tested with impact velocity(7.19m/sec) the same as a real life car clash. Characteristics of collapse have been reviewed and a structure of optimal energy absorbing capacity is suggested.
A Study on Shape Optimization for Buckling and Postbuckling Behavior of Stiffened Laminated Composite Panels
Lee, Gwang-Rok ; Jeong, Gi-Hyeon ; Heo, Seong-Pil ; Yang, Won-Ho ; Jo, Myeong-Rae ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 1, 2001, Pages 106~114
DOI : 10.22634/KSME-A.2001.25.1.106
In this study, a shape optimization of stiffener was conducted to increase buckling load or failure load in each case with a different design value and a different objective function for stiffened laminated composite panel of I-type under compression loading. Regarding each of buckling load or failure load as objective function, optimum design was carried out. In respect of optimum design, the effects of relative length of web and cab of stiffener on buckling load or failure load of postbuckling were investigated.
Bondline Strength Evaluation of Honeycomb Sandwich Panel For Cure Process and Moisture Absorption
Choe, Heung-Seop ; Jeon, Heung-Jae ; Nam, Jae-Do ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 1, 2001, Pages 115~126
DOI : 10.22634/KSME-A.2001.25.1.115
In this paper, through a series of comparative experiments, effects of two different cure processing methods, cocure and precure, on the mechanical properties of honeycomb core materials for aircraft applications are considered. Mass of moisture accumulated into the closed cells of the sandwich panel specimen from the measured mass of moisture diffused to the full saturation state into the elements(skin, adhesive layer, Nomex honeycomb), consisting the honeycomb sandwich specimen has been calculated. Water reservoir of 70
was used to have specimens absorb moisture to see the influence of moisture absorbed into sandwich panel on its mechanical properties. For the repair condition holding for 2 hours at 177
(350℉) temperature, a pressure due to the vapor expansion in each cell of the sandwich panel, which may result in the local separation of the interface between laminated skin and the surface of the honeycomb, has been estimated by vapor pressure-temperature relation from the thermodynamic steam table and compared to the pressure from the ideal gas state equation. The bonding strengths of the laminated skins on the flat surface of the Nomex honeycomb have been compared by the flatwise tension test and climbing drum peel test performed at room temperature for dry, wet and wet-repair specimens, respectively.
A Study on the Axial Stiffness Prediction of Stand Using Analysis of Variance
Park, Yong-Dae ; Yang, Won-Ho ; Heo, Seong-Pil ; Seong, Gi-Deuk ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 1, 2001, Pages 127~134
DOI : 10.22634/KSME-A.2001.25.1.127
Wire ropes are widely used in cable car, suspension bridge and elevator, etc. and composed of single or multi-layer strands. It is difficult to find out the characteristics of a strand or wire rope because of complicated geometry and contact condition. In this study, the axial stiffness is evaluated using finite element method and reliable finite element analysis model is presented, taking into consideration the convergence on the length. The axial stiffness predictive equation of a strand is developed using analysis of variance, which can be applicable for characterizing the relationship between load and displacement when the strand configuration is determined.
Transverse Vibration Control of an Axially Moving String by Velocity Boundary Control
Ryu, Du-Hyeon ; Park, Yeong-Pil ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 1, 2001, Pages 135~144
DOI : 10.22634/KSME-A.2001.25.1.135
In this study, the time varying boundary control using the right boundary transverse motion is suggested to stabilize the transverse vibration of an axially moving string on the basis of the energy flux between the moving string and the boundaries. The effectiveness of the active velocity boundary control is showed through the FDM simulation results. Sliding mode control is adopted in order to achieve velocity tracking control of the time varying right boundary to dissipate vibration energy of the string effectively. Optical sensor system for measuring the transverse vibration of an axially moving string is developed, and the angle of the incident wave to the right boundary, which is the input of the velocity boundary controller, is obtained. Experimental research is carried out to examine the validity and the performance of the transverse vibration control using the suggested velocity right boundary control scheme.
Real Time Estimation of Temperature Distribution of a Ball Screw System Using Modal Analysis and Observer
An, Jung-Yong ; Kim, Tae-Hun ; Jeong, Seong-Jong ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 1, 2001, Pages 145~152
DOI : 10.22634/KSME-A.2001.25.1.145
Thermal deformation of a machine tool structure can be evaluated from the analysis of the whole temperature field. However, it is extremely inefficient and impossible to know the whole temperature field by measuring temperatures at every point. So, the temperature estimator is required, which can predict the whole temperature field from the temperatures of just a few points. In this paper, a 1-dimensional heat transfer problem is modeled with modal analysis and state space equations. And then the state observer is designed to estimate the intensity of heat source and the whole temperature field in real time. The reliability of the estimator is verified by making comparison between solutions obtained from the proposed method and the exact solutions of examples. The proposed method is applied to the estimation of temperature distribution in a ball screw system.
Sensitivity Analysis of Engine Mount System using FRF-based Substructuring Method
Lee, Du-Ho ; Hwang, U-Seok ; Kim, Chan-Muk ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 1, 2001, Pages 153~160
DOI : 10.22634/KSME-A.2001.25.1.153
A general procedure for the design sensitivity analysis of structural dynamic problems has been presented in frame of the FRF-based substructuring formulation. For a system response function, the proposed method gives a parametric design sensitivity formula in terms of the partial derivatives of the connection element properties and the transfer matrix of the subsystems. The derived design sensitivity formula is applied to an engine mount system. An interior noise problem in the passenger car is analyzed using the FRF-based substructuring method and the proposed formulation is adopted to study the response variations with respect to the dynamic characteristics of the engine mounts and the bushes. To obtain the FRFs, a finite element model is built for the engine mount structures, and test data is used for the trimmed body including cabin cavity. The comparison of sensitivities derived by the proposed method and the finite difference method shows that the proposed method is efficient and accurate. The proposed sensitivity analysis method indicates effectively the most sensitive location to the interior noise among the engine mounts and the bushes.
Characteristic of Fatigue Properties with Tension and Bending Loading Using High Strength Steel Wire
U, Byeong-Cheol ; Kim, Sang-Su ; Kim, Byeong-Geol ; Seo, Chang-Min ;
Transactions of the Korean Society of Mechanical Engineers A, volume 25, issue 1, 2001, Pages 161~167
DOI : 10.22634/KSME-A.2001.25.1.161
The overhead transmission wires operating both at warm temperature and tighten state for a long period of time in a power transmission plant are degraded by air pollution, wind, creep and slip between steel wire and aluminium conductor. The objective of this study is to investigate to investigate the characteristics of fatigue properties with tension and bending loading of a high carbon steel wire. The fatigue behaviors have been carried out by tension-tension, 4 points bending and 3 points bending loading. In the present study, a conventional fatigue strengths between 4 points bending and tension-tension fatigue were determined by Gerber, Sorderberg and Goodmans theory and we investigated S-N diagram for bending and tensile loading.