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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 30, Issue 12 - Dec 2006
Volume 30, Issue 11 - Nov 2006
Volume 30, Issue 10 - Oct 2006
Volume 30, Issue 9 - Sep 2006
Volume 30, Issue 8 - Aug 2006
Volume 30, Issue 7 - Jul 2006
Volume 30, Issue 6 - Jun 2006
Volume 30, Issue 5 - May 2006
Volume 30, Issue 4 - Apr 2006
Volume 30, Issue 3 - Mar 2006
Volume 30, Issue 2 - Feb 2006
Volume 30, Issue 1 - Jan 2006
Selecting the target year
The Effects of Surface Energy and Roughness on Adhesion Force
Rha, Jong-Joo ; Kwon, Sik-Cheol ; Jeong, Yong-Soo ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 11, 2006, Pages 1335~1347
DOI : 10.3795/KSME-A.2006.30.11.1335
Surface energies calculated from measured contact angles between several solutions and test samples, such as Si wafer,
, PTFE(Polytertrafluoroethylene), and DLC(Diamond Like Carbon) films, based on geometric mean method and Lewis acid base method. In order to relate roughness to adhesion force, surface roughness of test samples were scanned large area and small by AFM(Atomic Force Microscopy). Roughness was representative of test samples in large scan area and comparable with AFM tip radius in small scan area. Adhesion forces between AFM tip and test samples were matched well with order of roughness rather then surface energy. When AFM tips having different radius were used to measure adhesion force on DLCI film, sharper AFM tip was, smaller adhesion force was measured. Therefore contact area was more important factor to determine adhesion force.
Navigation Control Architecture of the Reactive Layer for Autonomous Mobile Robots
Kim, Hyung-Jin ; Jeon, Sung-Yong ; Sohn, Won-Jong ; Hong, Keum-Shik ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 11, 2006, Pages 1348~1357
DOI : 10.3795/KSME-A.2006.30.11.1348
In a hybrid three-layer control architecture(deliberative, sequencing, and reflexive), the lowest reflexive layer consists of resources, actions, an action coordinator, and motion controllers. Because the execution of individual components in the reflexive layer should be done in real-time, each component has to be simple and, due to this reason, the Linux-RTAI(Real-Time Application Interface for Linux) has been used as an operating system. In this paper, a navigation control architecture, which combines the components in the reflexive layer and the navigation-related modules in the sequencing layer, is proposed. And then, as basic components, four actions(Goto, Avoid, Move, and EmergencyStop) are designed. Experimental results confirm the effectiveness of the proposed architecture and the performance of individual associated actions.
Development of Pareto Artificial Life Optimization Algorithm
Song, Jin-Dae ; Yang, Bo-Suk ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 11, 2006, Pages 1358~1368
DOI : 10.3795/KSME-A.2006.30.11.1358
This paper proposes a Pareto artificial life algorithm for solving multi-objective optimization problems. The artificial life algorithm for optimization problem with a single objective function is improved to handle Pareto optimization problem through incorporating the new method to estimate the fitness value for a solution and the Pareto list to memorize and to improve the Pareto optimal set. The proposed algorithm was applied to the optimum design of a journal bearing which has two objective functions. The Pareto front and the optimal solution set for the application were presented to give the possible solutions to a decision maker or a designer. Furthermore, the relation between linearly combined single-objective optimization problem and Pareto optimization problem has been studied.
Study on Electro-Mechanical Characteristics of Array Type Capacitive Pressure Sensors with Stainless Steel Diaphragm and Substrate
Lee, Heung-Shik ; Chang, Sung-Pil ; Cho, Chong-Du ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 11, 2006, Pages 1369~1375
DOI : 10.3795/KSME-A.2006.30.11.1369
In this work, mechanical characteristics of stainless steel diaphragm have been studied as a potential robust substrate and a diaphragm material for micromachined devices. Lamination process techniques combined with traditional micromachining processes have been adopted as suitable fabrication technologies. To illustrate these principles, capacitive pressure sensors based on a stainless steel diaphragm have been designed, fabricated and characterized. The fabrication process for stainless steel micromachined devices keeps the membrane and substrate being at the environment of 8.65MPa pressure and
for a half hour and then subsequently cooled to
. Each sensor uses a stainless steel substrate, a laminated stainless steel film as a suspended movable plate and a fixed, surface micromachined back electrode of electroplated nickel. The finite element method is adopted to investigate residual stresses formed in the process. Besides, out-of-plane deflections are calculated under pressures on the diaphragm. The sensitivity of the device fabricated using these technologies is 9.03 ppm
with a net capacitance change of 0.14 pF over a range 0
A Study of the Cap Model for Metal and Ceramic Powder under Cold Compaction
Lee, Sung-Chul ; Kim, Ki-Tae ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 11, 2006, Pages 1376~1383
DOI : 10.3795/KSME-A.2006.30.11.1376
Densification behavior of various metal and ceramic powders was investigated under cold compaction. The Cap model was proposed by using the parameters involved in the yield function for sintered metal powder and volumetric strain evolution under cold isostatic pressing. The parameters for ceramic powder can also be obtained from experimental data under triaxial compression. The Cap model was implemented into a finite element program (ABAQUS) to compare with experimental data for densification behavior of various metal and ceramic powders under cold compaction. The agreement between finite element calculations from the Cap model and experimental data is very good for metal and ceramic powder under cold compaction.
Prediction of the Critical Stress for the Inclined Crack in Orthotropic Materials under Biaxial load
Lim, Won-Kyun ; Cho, Hyung-Suk ; Jeong, Woo-Kil ; Lee, Ill-Soo ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 11, 2006, Pages 1384~1391
DOI : 10.3795/KSME-A.2006.30.11.1384
The problem of an infinite anisotropic material with a crack inclined with respect to the principal material axes is analyzed. The material is subjected to uniform biaxial load along its boundary. It is assumed that the material is homogeneous, but anisotropic. By considering the effect of the horizontal load, the distribution of stresses at the crack tip is analyzed. The problem of predicting critical stress in anisotropic solids which is a subject of considerable practical importance is examined and the effect of load biaxiality is made explicitly. The present results based on the normal stress ratio theory show significant effects of biaxial load, crack inclination angle and fiber orientation on the critical stress. The analysis is performed for a wide range of the crack angles and biaxial loads.
Size Effect on the Modulus of Rupture in Automotive Ceramic Monolithic Substrate using Optimization and Response Surface Method
Baek, Seok-Heum ; Shin, Soon-Gi ; Joo, Won-Sik ; Cho, Seok-Swoo ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 11, 2006, Pages 1392~1400
DOI : 10.3795/KSME-A.2006.30.11.1392
Since the monolithic ceramic substrate was in introduced for automotive catalytic converters, the durability of the substrate has been a continuing requirement to reduce the emission, gas of vehicle. The substrate can occupy a volume as small as 82
and as large as 8200
to provide the required substrate for catalytic activity. The long-term durability varies with the size of the substrate from manufacture's point of view. Therefore this study presents that the response surface model using central composite design can explain size effect on the modulus of rupture in a cordierite ceramic monolithic substrate.
A Study on the Impedance Scaled Tele-Nanomanipulation in a Nanoscale Virtual Environment
Kim, Sung-Gaun ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 11, 2006, Pages 1401~1407
DOI : 10.3795/KSME-A.2006.30.11.1401
In a haptic interface system with a nanoscale virtual environment (NVE) using an atomic force microscope (AFM), impedance scaling is important. In order to explicitly derive the relationship between performance and impedance scaling factors, a nanoscale virtual coupling (NSVC) concept and a selection method of scaling factors of velocity (or position) and force are introduced. An available scaling factor region is represented based on Llewellyn's absolute stability criteria and the physical limitation of the haptic device. Experiments have been performed for tele-nanomanipulation tasks such as positioning, indenting and nanolithography with available force scaling factor in the NVE.
A Simulation Model of the ACL Function Using MADYMO
Park, Jung-Hong ; Son, Kwon ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 11, 2006, Pages 1408~1416
DOI : 10.3795/KSME-A.2006.30.11.1408
A mathematical knee model was constructed using MADYMO. The purpose of this study is to present a more realistic model of the human knee to reproduce human knee motion. Knee ligaments were modeled as line elements and the surrounding muscles were considered as passive restraint elements. A calf-free-drop test was performed to validate the suggested model. A calf was dropped from the rest at about 65 degree flexed posture in the prone position. The motion data were recorded using four video cameras and then three dimensional data were acquired by Kwon3D motion analysis software. The results showed that general shapes of angular quantities were similar in both the experiment and computer simulation. Functional stability of the anterior cruciate ligament was explicitly revealed through this model.
An Evaluation of Probabilistic Strain-Life Curve in Polyacetal
Jang, Cheon-Soo ; Kim, Chul-Su ; Park, Bum-Gyu ; Kim, Jung-Kyu ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 11, 2006, Pages 1417~1424
DOI : 10.3795/KSME-A.2006.30.11.1417
In order to evaluate variation of fatigue life of mechanical components including engineering plastics, it is important to estimate probabilistic strain-life curves to accurately define the variation of fatigue characteristics. This paper intends to provide new assessment of P-
-N (probabilistic strain-life curves) for considering the variation of fatigue characteristics in polyacetal. The fatigue strain controlled tests were conducted under constant 50% humidity and room temperature condition by a universal testing machine at strain ratio, R=0. A practical procedure is introduced to evaluate probabilistic strain-life curves. Three probabilistic distributions were used for generating P-
-N curves such as normal, 2-parameter and 3-parameter Weibull. In this study, 3-parameter Weibull distribution was found to be most appropriate among assumed distributions when the probability distributions of the fatigue characteristic were examined using chi-square and Kolmogorov-Smirnov test. The more appropriate P-
-N curves for these materials are generated by the proposed method considering 3-parameter Weibull distribution.
Identification of the Bulk Behavior of Coatings by Nanoindentation Test and FE-Simulation and Its Application to Forming Analysis of the Coated Steel Sheet
Lee, Jung-Min ; Lee, Kyoung-Su ; Ko, Dae-Cheol ; Kim, Byung-Min ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 11, 2006, Pages 1425~1432
DOI : 10.3795/KSME-A.2006.30.11.1425
Coating layers on a coated sheet steel frequently affect distributions of strain rate of sheets and deteriorate the frictional characteristics between sheets and tools in sheet metal forming. Thus, it is important to identify the deformation behavior of these coatings to ensure the success of the sheet forming operation. In this study, the technique using nano-indentation test, FE-simulation and Artificial Neural Network(ANN) were proposed to determine the power law stress-strain behavior of coating layer and the power law behavior of extracted coating layers was examined using FE-simulation of drawing and nano-indentation process. Also, deep drawing test was performed to estimate the formability and frictional characteristic of coated sheet, which was calculated using the linear relationship between drawing force and blank holding force obtained from the deep drawing test. FE-simulations of the drawing process were respectively carried out for single-behavior FE-model having one stress-strain behavior and for layer-behavior FE-model which consist of coating and substrate separately. The results of simulations showed that layer-behavior model can predict drawing forces with more accuracy in comparison with single-behavior model. Also, mean friction coefficients used in FE-simulation signify the value that can occur maximum drawing force in a drawing test.
Finite Element Approach to Socket Shape Design of a Concave Piston Assembly for a High Pressure Hydraulic Pump
Eom, Jae-Gun ; Lee, Min-Cheol ; Choi, In-Soo ; Cho, Yoo-Jong ; Joun, Man-Soo ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 11, 2006, Pages 1433~1438
DOI : 10.3795/KSME-A.2006.30.11.1433
A systematic approach to socket shape design of a concave piston assembly for a high pressure hydraulic pump of an excavator is presented in this paper. A design model is given and a methodology of socket shape design is proposed. An axisymmetric rigid-plastic finite element method is employed for predicting the approximate socket shape formed by a rotary forming process as well as for simulating the test process for separating the shoe from the piston assembly designed. It is verified that the predictions are in good agreement with the experiments. The approach is successfully applied to developing an optimal concave piston assembly.
Fatigue Strength Estimation of the Fillet Weldments with Different Beveling Angle and Porosity
Hong, Chun-Hyi ; Oh, Se-Jong ; Lee, Won-Seok ; Lee, Hyun-Woo ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 11, 2006, Pages 1439~1446
DOI : 10.3795/KSME-A.2006.30.11.1439
The fatigue test of the fillet weldments was executed with different beveling angles and porosities. The beveling angles of
were compared with fatigue lives. After the fillet weldment failure, the porosities which found at the fractured surface were observed to account the effect on fatigue life. Finite element analysis was performed to correlate the fatigue strength and the sizes and the locations of porosities. The stress-strain field was severely affected by the length of notch and the sizes and locations of porosities. Based on the quantitative analysis of porosity effect, the total volume of porosities was a key factor for fatigue strength of the fillet weldment.
Parallel Contact Treatment and Parallel Performance of Impact Simulation Based on Lagrangian Scheme
Back, Seung-Hoon ; Kim, Seung-Jo ; Lee, Min-Hyung ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 11, 2006, Pages 1447~1454
DOI : 10.3795/KSME-A.2006.30.11.1447
The evaluation of parallel performance of a high speed impact simulation is not an easy task because not only the development of parallel explicit code is difficult but also a large number of processors is not easily accessible. In this paper, the parallel performance of a new Lagrangian FEM impact code carried out on cluster supercomputer has been described in high speed range. In the case of metal sphere impacting to oblique plate, the overall speed-up continuously increases even up to 128 CPUs. Investigation of elapsed time of each part reveals that most of the inefficiency comes from the load imbalance of contact.
Finite Element Analysis for the Prediction of Fatigue Crack Opening Behavior Using Cyclic Crack Tip Opening Displacement
Choi, Hyeon-Chang ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 11, 2006, Pages 1455~1460
DOI : 10.3795/KSME-A.2006.30.11.1455
The relationship between fatigue crack growth behavior and cyclic crack tip opening displacement is studied. An elastic-plastic finite element analysis (FEA) is performed to examine the growth behavior of fatigue crack, where the contact elements are used in the mesh of the crack tip area. We investigate the relationship between the reversed plastic zone size and the changes of the cyclic crack tip opening displacement along the crack growth. We investigate the effect of the element size when predict fatigue crack opening behavior using the cyclic crack tip opening displacement obtained from FEA. The cyclic crack tip opening displacement is related to fatigue crack opening behavior.
The Rolling Behavior of a Small Regular Polygonal Part on an Inclined Plane
Han, In-Hwan ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 11, 2006, Pages 1461~1471
DOI : 10.3795/KSME-A.2006.30.11.1461
This paper presents the mathematical model for rolling behaviors of a small regular polygonal part on an inclined plane. Throughout the numerical analysis performed with the simulation program which has been experimentally validated, it is shown that the number of edges of the rolling polygonal part can be a measure for the energy dissipation rather than the coefficient of friction. The appropriate slope angle has been found to be around 20 degree for roughness-separation as well as shape-separation of polygonal parts which have small number of edges. In additions, the vibratory motion applied to the inclined plane is able to cause mixed parts to be separated more effectively according to the shape or the roughness. Finally, a couple of parts separation methods based on the analysis results are presented, and are validated through the numerical simulation.
Design Optimization of Double-deck Train Carbody Under Multi-loading Condition
Lee, Tae-Hee ; Lee, Jin-Min ; Jung, Jae-Jun ; Hwang, Won-Ju ; Kim, Hyeong-Jin ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 11, 2006, Pages 1472~1478
DOI : 10.3795/KSME-A.2006.30.11.1472
Double-deck train has been attracted growing attention as next generation transportation around metropolis because of high passenger carrying capacity. To develop high-speed double-deck train with low operational costs, the carbody must be designed as light as possible. In addition, the carbody must be strong enough to ensure the safety of passengers. To meet these design requirements, we perform systematically weight minimization that determines thickness of aluminum extruded panels of the carbody. First, to reduce the design variables, we carry out the screening process that select sensitive or/and important design variables through design exploration. Then, weight minimization is accomplished under multi-loading condition such as vertical, compressive and torsional loads, while satisfying strength constraints of the design regulations. Finally, the result of design optimization is discussed by comparison with its initial design.
Shape Optimal Design to Minimize Dynamic Twisting Deformation of the Door Frame of a Microwave Oven
Lee, Boo-Youn ; Koo, Jin-Young ; Kim, Won-Jin ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 11, 2006, Pages 1479~1485
DOI : 10.3795/KSME-A.2006.30.11.1479
To minimize the leakage of microwave which can occur when one pulls the door of a microwave oven during its operation, shape optimization of the door frame is presented. A numerical optimization is implemented to minimize the dynamic twisting deformation of the door frame. Shape design variables are defined, which represent the dimension of the bead in the flange. Two optimal design problems are established to minimize the maximum twisting deformation from harmonic response analysis. The problems are solved, their results being compared and evaluated.
Dynamic Modeling and Analysis of a High Mobility Tracked Vehicle
Lee, Byung-Hoon ; Souh, Byung-Yil ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 11, 2006, Pages 1486~1493
DOI : 10.3795/KSME-A.2006.30.11.1486
This paper presents a dynamic model of a high mobility tracked vehicle composed of rigid bodies. Track is modeled as an extensible cable and the track tension between the sprocket and roller is calculated by the catenary equation. The ground force acting on a road wheel is calculated by the Bekker's pressure-sinkage relationship using the segmented wheel model. System equations of motion and constraint acceleration equations are derived in the joint coordinate space using the velocity transformation method.
Experimental Study on the Physical and Mechanical Properties of a Copper Alloy for Liquid Rocket Combustion Chamber Application
Ryu, Chul-Sung ; Baek, Un-Bong ; Choi, Hwan-Seok ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 11, 2006, Pages 1494~1501
DOI : 10.3795/KSME-A.2006.30.11.1494
Mechanical and physical properties of a copper alloy for a liquid rocket engine(LRE) combustion chamber liner application were tested at various temperatures. All test specimens were heat treated with the condition they might experience during actual fabrication process of the LRE combustion chamber. Physical properties measured include thermal conductivity, specific heat and thermal expansion data. Uniaxial tension tests were preformed to get mechanical properties at several temperatures ranging from room temperature to 600
. The result demonstrated that yield stress and ultimate tensile stress of the copper alloy decreases considerably and strain hardening increases as the result of the heat treatment. Since the LRE combustion chamber operates at higher temperature over 400
, the copper alloy can exhibit time-dependent behavior. Strain rate, creep and stress relaxation tests were performed to check the time-dependent behavior of the copper alloy. Strain rate tests revealed that strain rate effect is negligible up to 400
while stress-strain curve is changed at 500
as the strain rate is changed. Creep tests were conducted at 250
and the secondary creep rate was found to be very small at both temperatures implying that creep effect is negligible for the combustion chamber liner because its operating time is quite short.