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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 29, Issue 12 - Dec 2005
Volume 29, Issue 11 - Nov 2005
Volume 29, Issue 10 - Oct 2005
Volume 29, Issue 9 - Sep 2005
Volume 29, Issue 8 - Aug 2005
Volume 29, Issue 7 - Jul 2005
Volume 29, Issue 6 - Jun 2005
Volume 29, Issue 5 - May 2005
Volume 29, Issue 4 - Apr 2005
Volume 29, Issue 3 - Mar 2005
Volume 29, Issue 2 - Feb 2005
Volume 29, Issue 1 - Jan 2005
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Kinematics of Grasping and Manipulation of Curved Surface Object with Robotic Hand
Hwang Chang-Soon ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 1, 2005, Pages 1~13
DOI : 10.3795/KSME-A.2005.29.1.001
Kinematics of grasping and manipulation by a multi-fingered robotic hand where multi-fingertip surfaces are in contact with an object is solved. The surface of the object was represented by B-spline surfaces in order to model the objects of various shapes. The fingers were modeled by cylindrical links and a half ellipsoid fingertip. Geometric equations of contact locations have been solved for all possible contact combinations between the fingertip surface and the object. The simulation system calculated joint displacements and contact locations for a given trajectory of the object. Since there are no closed form solutions for contact or intersection between these surfaces, kinematics of grasping was solved by recursive numerical calculation. The initial estimate of the contact point was obtained by approximating the B-spline surface to a polyhedron. As for the simulation of manipulation, exact contact locations were updated by solving the contact equations according to the given contact states such as pure rolling, twist-rolling or slide-twist-rolling. Several simulation examples of grasping and manipulation are presented.
Experimental Study of 3-Dimensional Rapid Prototyping by Laser Chemical Vapor Deposition
Ryu Jae Eun ; Lee Young Lim ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 1, 2005, Pages 14~21
DOI : 10.3795/KSME-A.2005.29.1.014
Laser chemical vapor deposition can be an effective technique for a rapid prototyping with ceramic materials, in particular. The objective of the study is to fabricate several 3-dimensional objects by stacking multi-layers as well as to find out some basic aspects of a rapid prototyping with laser chemical vapor deposition such as deposition characteristics with traversing speed of the laser, possible problems in stacking multi-layers etc. The limit speed of the laser that can grow a tilted SiC rod was found in this study, and laser directing writing that occurs over the limit speed was also investigated. Finally, a zigzag-shaped rod, a spiral-shaped rod, a wall and a square duct were successfully fabricated with laser chemical vapor deposition of tetramethylsilane
Topology Optimization Through Material Cloud Method
Chang Su-Young ; Youn Sung-Kie ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 1, 2005, Pages 22~29
DOI : 10.3795/KSME-A.2005.29.1.022
A material cloud method, which is a new topology optimization method, is presented. In MCM, an optimal structure can be found out by manipulating sizes and positions of material clouds, which are lumps of material with specified properties. A numerical analysis for a specific distribution of material clouds is carried out using fixed background finite element mesh. Optimal material distribution can be element-wisely extracted from material clouds' distribution. In MCM, an expansion-reduction procedure of design domain for finding out better optimal solution can be naturally realized. Also the convergence of material distribution is faster and well-defined material distribution with fewer intermediate densities can be obtained. In addition, the control of minimum-member sizes in the material distribution can be realized to some extent. In this paper, basic concept of MCM is introduced, and formulation and optimization results of MCM are compared with those of the traditional density distribution method(DDM).
SPH Algorithm for an Elasto-Plastic Contact Analysis on a Rigid Surface with an Arbitrary Shape
Lee Jaehoon ; Min Oakkey ; Seo Songwon ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 1, 2005, Pages 30~37
DOI : 10.3795/KSME-A.2005.29.1.030
There is few research about contact problem for a rigid surface with an arbitrary shape in SPH. The variational equation based on the virtual work principle is derived and its solution is obtained by the penalty method. It is proposed a new method that can determine the parameters for a penetration and a penetration rate used in the penalty method. The reproducing condition is adopted to correct the deficiency of kernel on the boundary. In order to calculate a penetration of particles, after checking boundary particles for deformable body, boundary normal vectors were determined on the rigid surface. Numerical simulations for models which have rigid surface with an arbitrary shape were conducted to validate the proposed method in 2D Cartesian and cylindrical coordinate. The results of those analysis represent that the contact algorithm proposed in this study works properly.
A Study on Optimized Layout Design of FAS Line Through Production Flow Analysis
Ga Chun Sik ; Jang Bong-Choon ; Eom Yong-Gyun ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 1, 2005, Pages 38~44
DOI : 10.3795/KSME-A.2005.29.1.038
Many mid-sized companies in Korean automotive industry have attempted to solve the lack of human power, to control the quality of components, to improve the production rate, and to innovate the manufacturing line. The goals of this study are to analyze the production rate of an automotive component manufacturing line using simulation software, to construct a Flexible Automation Subassembly (FAS) system and to suggest an optimized layout design using FAS line. In this research, the simulation model for manufacturing line was developed and used the realistic data of a medium sized company in Korean automotive industry. To complete this research, a simulation software 'ARENA' was used. This research analyzed the work distribution strategy and cycle time element for production flow and proposed an optimized layout to resolve line balancing problem which would bring the improved production rate.
A Sequential Approximate Optimization Technique Using the Previous Response Values
Hwang Tae-Kyung ; Choi Eun-Ho ; Lim O-Kaung ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 1, 2005, Pages 45~52
DOI : 10.3795/KSME-A.2005.29.1.045
A general approximate optimization technique by sequential design domain(SDD) did not save response values for getting an approximate function in each step. It has a disadvantage at aspect of an expense. In this paper, previous response values are recycled for constructing an approximate function. For this reason, approximation function is more accurate. Accordingly, even if we did not determine move limit, a system is converged to the optimal design. Size and shape optimization using approximate optimization technique is carried out with SDD. Algorithm executing Pro/Engineer and ANSYS are automatically adopted in the approximate optimization program by SDD. Convergence criterion is defined such that optimal point must be located within SDD during the three steps. The PLBA(Pshenichny-Lim-Belegundu-Arora) algorithm is used to solve approximate optimization problems. This algorithm uses the second-order information in the direction finding problem and uses the active set strategy
A Continuous Cell Separation Chip Using Hydrodynamic Dielectrophoresis Process
Doh Il ; Cho Young-Ho ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 1, 2005, Pages 53~58
DOI : 10.3795/KSME-A.2005.29.1.053
We present a high-throughput continuous cell separation chip using hydrodynamic dielectrophoresis (DEP) process. The continuous cell separation chip uses three planar electrodes in a separation channel, where the positive DEP cells are moved away from the central streamline while the negative DEP cells remain in the central streamline. In the experimental study, we use the mixture of viable (live) and nonviable (dead) yeast cells in order to obtain the continuous cell separation conditions. For the conditions of the electric fields frequency of 5MHz and the medium conductivity of
, the fabricated chip performs a continuous separation of the yeast cell mixture at the varying flow-rate in the range of
.; thereby, resulting in the purity ranges of
respectively for the viable and nonviable yeast cells. present chip demonstrates the constant cell separation performance for varying mixture flow-rates.
Robust Kalman Filter Design via Selecting Performance Indices
Jung Jongchul ; Huh Kunsoo ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 1, 2005, Pages 59~66
DOI : 10.3795/KSME-A.2005.29.1.059
In this paper, a robust stationary Kalman filter is designed by minimizing selected performance indices so that it is less sensitive to uncertainties. The uncertainties include not only stochastic factors such as process noise and measurement noise, but also deterministic factors such as unknown initial estimation error, modeling error and sensing bias. To reduce the effect on the uncertainties, three performance indices that should be minimized are selected based on the quantitative error analysis to both the deterministic and the stochastic uncertainties. The selected indices are the size of the observer gain, the condition number of the observer matrix, and the estimation error variance. The observer gain is obtained by optimally solving the multi-objectives optimization problem that minimizes the indices. The robustness of the proposed filter is demonstrated through the comparison with the standard Kalman filter.
Effective Heater-Area and Droplet-Volume Adjustable Microinjectors Using a Digitally Controlled Single Heater
Je Chang Han ; Kang Tae Goo ; Cho Young-Ho ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 1, 2005, Pages 67~73
DOI : 10.3795/KSME-A.2005.29.1.067
The paper presents a single-heater microfluid injector, whose ejected droplet volume is adjusted by digital current path control for a single microheater. The previous droplet volume adjustable methods have used the digital current control for multiple heaters or the analog current control for a single heater, while the present method uses the digital current control for a single microheater. Two different microinjectors, having a rectangular heater and a circular hearter, are designed and fabricated in the chip area of
. The fabricated microinjectors have been tested and characterized for the number, size, shape and lifetime of the generated bubbles as well as for the volume and velocity of the ejected droplets. The input power for the rectangular heater and the circular heater has been varied in the ranges of
, respectively. The projected area of the generated bubble has been changed in the ranges of
for the rectangular heater and the circular heater, respectively. The microinjector with the rectangular heater ejects three discrete levels of the droplet in the volume range of
with the velocity range of
, while the microinjector with the circular heater achieves five discrete levels of the droplet in the volume range of
with the velocity range of
Creep-Life Prediction and Standard Error Analysis of Type 316LN Stainless Steel by Time-Temperature Parametric Methods
Yoon Song Nam ; Ryu Woo Seog ; Yi Won ; Kim Woo Gon ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 1, 2005, Pages 74~80
DOI : 10.3795/KSME-A.2005.29.1.074
A number of creep rupture data for type 316LN stainless steels were collected through literature survey or experimental data produced in KAERI. Using these data, polynomial equations for predicting creep life were obtained by Larson-Miller (L-M), Orr-Sherby-Dorn (O-S-D) and Manson-Haferd (M-H) parameters using time-temperature parametric (TTP) methods. Standard error of estimate (SEE) values for the each parameter was obtained with different temperatures through the statistical process of the creep data. The results of L-M, O-S-D and M-H methods showed good creep-life prediction, but M-H method showed better agreement than L-M and O-S-D methods. Especially, it was found that SEE values of M-H method at
were lower than that of L-M and O-S-D methods.
Damage Evaluation of CD-RW Drive by Drop Test and Simulation
Woo Jae Chul ; Yun Ki Won ; Seok Ki Young ; Kim Heon Young ; Kim Sang Bum ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 1, 2005, Pages 81~87
DOI : 10.3795/KSME-A.2005.29.1.081
A fracture of hand held device, such as radio, TV and CD-RW drive, mainly occurs due to drop situation. For CD-RW drive, the need of high reading/writing speed in conjunction with low price accelerates the fracture of the device. Computer simulation can reduce the period of development and enhance impact characteristic of device. In this study, the detailed finite element model of CD-RW drive was developed to predict the damage under drop conditions. Material property for shock absorbing damper was obtained from tensile test of raw material. A MOONEY-RIVLIN type rubber in LS-DYNA was used as the material model of damper. To assess the reliability of the developed model, drop test at 200G-2msec and 150G-10msec condition was conducted and acceleration at pick-up was compared.
Adaptive Control Incorporating Neural Network for a Pneumatic Servo Cylinder
Jang Yun Seong ; Cho Seung Ho ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 1, 2005, Pages 88~95
DOI : 10.3795/KSME-A.2005.29.1.088
This paper presents a design scheme of model reference adaptive control incorporating a Neural Network for a pneumatic servo system. The parameters of discrete-time model of plant are estimated by using the recursive least square method. Neural Network is utilized in order to compensate the nonlinear nature of plant such as compressibility of air and frictions present in cylinder. The experiment of a trajectory tracking control using the proposed control scheme has been performed and its effectiveness has been proved by comparing with the results of a model reference adaptive control.
Simulator of Integrated Single-Wafer Processing Tools with Contingency Handling
Kim Woo Seok ; Jeon Young Ha ; Lee Doo Yong ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 1, 2005, Pages 96~106
DOI : 10.3795/KSME-A.2005.29.1.096
An integrated single-wafer processing tool, composed of multiple single wafer processing modules, transfer robots, and load locks, has complex routing sequences, and often has critical post-processing residency constraints. Scheduling of these tools is an intricate problem, and testing schedulers with actual tools requires too much time and cost. The Single Wafer Processor (SWP) simulator presented in this paper is to validate an on-line scheduler, and evaluate performance of integrated single-wafer processing tools before the scheduler is actually deployed into real systems. The data transfer between the scheduler and the simulator is carried out with TCP/IP communication using messages and files. The developed simulator consists of six modules, i.e., GUI (Graphic User Interface), emulators, execution system, module managers, analyzer, and 3D animator. The overall framework is built using Microsoft Visual C++, and the animator is embodied using OpenGL API (Application Programming Interface).
A Study on the Evaluation of the Pipe Fracture Characteristic
Park Jae-Sil ; Kim Young-Jin ; Seok Chang-Sung ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 1, 2005, Pages 107~114
DOI : 10.3795/KSME-A.2005.29.1.107
In order to analyze the elastic-plastic fracture behavior of a structure, the fracture resistance curve of the material should be known first. The standard CT specimen was used to obtain the fracture resistance curves of a piping system. However, it is known that the fracture resistance curve by the standard CT specimen is very conservative to evaluate the integrity of a structure. Also the fracture resistance curve is effected by the specimen geometry and the dimensions because of the constraint effect. The objective of this paper is to be certain the conservativeness of the fracture resistance curve by the standard CT specimen and to provide an additional safety margin. For these, the fracture tests using a real pipe specimen and the standard CT specimen test were performed. A 4-point bending jig was manufactured for the pipe test and the direct current potential drop method was used to measure the crack extension and the length for the pipe test. Also finite element analyses were performed with a CT specimen and a pipe in order to prove the additional safety margin. From the result of tests and analyses of the pipe and the standard CT specimen, it was observed that the fracture analysis with the standard CT specimen is conservative and the additional safety margin was proved.
Development of a Position Control Algorithm for Feed Drives in Machine Tools Using an Error Model
Lee Gun Bok ; Gil Hyeong Gyeun ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 1, 2005, Pages 115~123
DOI : 10.3795/KSME-A.2005.29.1.115
This paper presents the development of an algorithm for position control of feed drives in machine tools. The algorithm is constructed through an experimental method based on proportional control with a ramp input. In the first step of designing, a tracking-error curve is generated with the proportional control, and then an error model is decided to reduce the tracking error, Next, the output signal of the error model is added to the current error signal to yield the actuating error signal. The effectiveness of the proposed scheme is confirmed through simulation and experiments.
A Study on Implementation of a BOM Management System Using Component Technique for Maintenance System of Urban Transit
Lee Ho-Yong ; Bae Chul-Ho ; Kim Kyu-Hee ; Suh Myung-Won ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 1, 2005, Pages 124~131
DOI : 10.3795/KSME-A.2005.29.1.124
BOM(Bill of Materials) is a list or description of raw materials, parts and assemblies that define a product. Although it is very important for maintenance information system of urban transit, it has problems that the size of database, inaccuracy and the flexibility which is measured as the number of updating records in accordance with added new product or engineering change. To solve these, we divide BOM to a master BOM and various function BOM constructed from the master BOM. That is the component based BOM management system, which is mutually independent and integrated efficiently using component technology. Consequently, after defining the component based master BOM, it is easy to manage the data structure, even restruct, in case there is a need for change of environment or data.
Evaluation of Characteristics for Stress Distribution on Cylindrical Beam Structure by Deformation and Restoration Process
Park Chi-Yong ; Kim Jin-Weon ; Boo Myung-Hwan ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 1, 2005, Pages 132~138
DOI : 10.3795/KSME-A.2005.29.1.132
In heavy industrial fields such as power plant and chemical plant, it is often necessary to restore damaged part of large machinery and structure which is installed in the hazard working place. In this paper, to estimate stress distribution which occurs during damage and restoration of cylindrical beam structure, the finite element technique has been used. A finite element model was verified by experiment for non deformed cylindrical beam structure. The displacements and elastic recovery have an excellent agreement between experiment and finite element analysis. The variations of stress distribution on deformation and restoration procedure for surfaces have been examined. The maximum von Mises stress appears in the surface for deformation and restoration procedure. In deformation procedure, the maximum stress occurs in the vicinity of support body. In restoration procedure, the maximum stress occurs in the vicinity of the fixing body. The fixing body allows avoiding stress concentration in adjacent support structure boundary.
Multi-Vehicle Tracking Adaptive Cruise Control
Moon Il ki ; Yi Kyongsu ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 1, 2005, Pages 139~144
DOI : 10.3795/KSME-A.2005.29.1.139
A vehicle cruise control algorithm using an Interacting Multiple Model (IMM)-based Multi-Target Tracking (MTT) method has been presented in this paper. The vehicle cruise control algorithm consists of three parts; track estimator using IMM-Probabilistic Data Association Filter (PDAF), a primary target vehicle determination algorithm and a single-target adaptive cruise control algorithm. Three motion models; uniform motion, lane-change motion and acceleration motion. have been adopted to distinguish large lateral motions from longitudinal motions. The models have been validated using simulated and experimental data. The improvement in the state estimation performance when using three models is verified in target tracking simulations. The performance and safety benefits of a multi-model-based MTT-ACC system is investigated via simulations using real driving radar sensor data. These simulations show system response that is more realistic and reflective of actual human driving behavior.
A Study on Analysis of Polymer Extruder Process Using Finite Element Method
Ye Youngsoo ; Kim Hongbum ; Lee Jaewook ; Kim Naksoo ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 1, 2005, Pages 145~155
DOI : 10.3795/KSME-A.2005.29.1.145
In this study, a finite element method program code which can be accomodate boundary conditions on the complex surfaces has been developed to simulate polymer extruder processes. The analysis method includes the fractional 4-step method for efficient computation time and compact usage of memory storage to solve the velocities and the pressure values from the Navier-Stokes equation. By using the developed program which was verified with simple Poiseuille flow mixture phenomena in single-and twin-screw extruder are analyzed. It is concluded that the proposed method resulte Poiseuille Poiseuille d in fair agreement with the exact solution of simple flow and the back flow near the entrance happens in single-screw model. It is identified that the location and values of maximum pressure in the twin screw extruder model. It is expected that the Velocity field found can be used to predict the degree of mixture in the extruder barrel.
Finite Element Analysis of Stent Expansion Considering Stent-Balloon Interaction
Oh Byung-Ki ; Cho Hae-Yong ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 1, 2005, Pages 156~162
DOI : 10.3795/KSME-A.2005.29.1.156
Stouts are frequently used throughout the human body, but the most critical areas are in coronary arteries. They open pathways in vessels and supply blood directly to the heart muscle. To simulate behavior of expansion for the coronary stent by balloon, the commercial finite element code LS-DYNA and ANSYS were used in the analysis. The explicit method is used to analyze the expansion of the stent and the implicit method is performed to simulate the springback that developed in a stent after the balloon pressure has been removed. Finally the experimental results for the expansion of the PS153 stents were compared with the FEM results. The springback was measured with the stents subjected to no external pressure to which stents are subjected in vivo. The simulated results were in good agreement with experimental results. Standard mechanical characteristics such as stress, plastic strains, and springback can be derived from the numerical results. These data can be used to determine maximum expansion diameter without fracture and expansion pressure considering elastic recoil.