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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 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
Selecting the target year
An Accelerated Life Test for Burnout of Tungsten Filament of Incandescent Lamp
Kim Jin-Woo ; Shin Jae-Chul ; Kim Myung-Soo ; Lee Jae-Kook ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 7, 2005, Pages 921~929
DOI : 10.3795/KSME-A.2005.29.7.921
This paper presents an accelerated life test for burnout of tungsten filament of incandescent lamp. From failure analyses of field samples, it is shown that their root causes are local heating or hot spots in the filament caused by tungsten evaporation and wire sag. Finite element analysis is performed to evaluate the effect of vibration and impact for burnout, but any points of stress concentration or structural weakness are not found in the sample. To estimate the burnout life of lamp, an accelerated life test is planned by using quality function deployment and fractional factorial design, where voltage, vibration, and temperature are selected as accelerating variables. We assumed that Weibull lifetime distribution and a generalized linear model of life-stress relationship hold through goodness of fit test and test for common shape parameter of the distribution. Using accelerated life testing software, we estimated the common shape parameter of Weibull distribution, life-stress relationship, and accelerating factor.
A Study on the Effect of Compressive Residual Stress for Corrosion Property of SUP-9 Steel Using as Suspension Material
Ru Hyung-Ju ; An Jae-pil ; Park Keyung-dong ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 7, 2005, Pages 930~937
DOI : 10.3795/KSME-A.2005.29.7.930
One of the useful technology for light-weightening of components required in the automobile and machine industry is to use of high strength materials. To improve material properties, carbonizing treatment, nitrifying treatment, and shot-peening method are representatively applied, However, the shot-peening method is generally used to remove the surface defect of steel and to improve the fatigue strength on surface. Benefits by shot peening are to make increase resistance against fatigue, stress corrosion cracking, fretting, galling, erosion and closing of pores. In this paper, investigated the effect of shot peening on the corrosion of SUP-9 steel immersed in
NaCl solution and corrosion characteristics by the heat treatment during shot peening process. The immersion test was performed on the four kinds of specimens. Corrosion potential, polarization curve, residual stress and etc. were investigated from the experimental results.
Limit Cycle Application to Friction Identification and Compensation
Kim Min-Seok ; Kim Myoung-Zoo ; Chung Sung-Chong ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 7, 2005, Pages 938~946
DOI : 10.3795/KSME-A.2005.29.7.938
Friction is a dominant nonlinear factor in servomechanisms, which seriously deteriorates system accuracy. A friction compensator is indispensable to fabricate high-performance servomechanisms. In order to compensate for the friction in the servomechanism, identification of the friction elements is required. To estimate the friction of the servomechanism, an accurate linear element model of the system is required first. Tn this paper, a nonlinear friction model, in which static, coulomb and viscous frictions as well as Stribeck effect are included, is identified through the describing function approximation of the nonlinear element. A nonlinear element composed of two relays is intentionally devised to induce various limit cycle conditions in the velocity control loop of the servomechanism. The friction coefficients are estimated from the intersection points of the linear and nonlinear elements in the complex plane. A Butterworth filter is added to the velocity control loop not only to meet the assumption of the harmonic balance method but also to improve the accuracy of the friction identification process. Validity of the proposed method is confirmed through numerical simulations and experiments. In addition, a model-based friction compensator is applied as a feedforward controller to compensate fur the nonlinear characteristics of the servomechanism and to verify the effectiveness of the proposed identification method.
Development of Failure Pressure Evaluation Model for Internally Well Thinned Piping Components
Na Man-Gyun ; Park Chi-Yong ; Kim Jin-Weon ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 7, 2005, Pages 947~954
DOI : 10.3795/KSME-A.2005.29.7.947
The purpose of this study is to develop failure pressure evaluation models, which are applicable to straight pipes and elbows containing an internally wall thinning defect induced by flow-accelerated-corrosion (FAC). In this study, thus, three dimensional finite element (FE) analyses are performed to investigate the dependences of failure pressure of internally wall thinned pipe on the defect shape, the pipe geometry, and the defect location and bend radius of elbow. Also, the existing failure pressure assessment models for externally wall thinned pipes are examined. Based on these, the new models for assessing failure pressure of piping components with an internally wall thinning defect are proposed. Comparison of failure pressure, predicted by proposed models, with FE analysis result shows good agreement regardless of pipe type, defect shape, and defect location and bend radius.
Vibration Analysis and Its Application of a Linear Motion Guide Supported by Rolling Ball Bearings
Choi Jae Seok ; Yi Yong-sub ; Kim Yoon Young ; Lee Dong Jin ; Lee Sung Jin ; Yoo Jeonghoon ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 7, 2005, Pages 955~963
DOI : 10.3795/KSME-A.2005.29.7.955
This research investigates dynamic characteristics of a linear motion (LM) guide through a experimental result and theoretical analysis. The stiffness in the LM guide is determined by the preloading due to the minus clearance between the ball bearing and the contact surface and it can be derived by Hertzian contact theory and the nonlinear motion of equation. The vibration analysis is performed using Lagrange equations and its result agrees with the experiment result. Using the sensitivity analysis on design parameters such as the contact angles of ball bearings and the eccentricity of mass center, the variation of the natural frequencies can be predicted.
The Evaluation of the Creep Properties of ZIRLO Cladding Using the Ring Specimen
Bae Bong-Kook ; Koo Jae-Mean ; Seok Chang-Sung ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 7, 2005, Pages 964~969
DOI : 10.3795/KSME-A.2005.29.7.964
In this study, we suggested the ring creep test using the ring specimen of Arsene for estimating the burst creep properties of the cladding in stead of burst creep test. For this objective, we used the load-displacement conversion relationship of ring specimen called LCRR which had been determined on our previous study at high temperature by performing the ring tensile test and the numerical analysis. Then we carried out both the ring creep test and the burst creep test between
which were higher than the in-service temperature of the cladding in a reactor. The creep properties from the ring creep test with applying LCRR were compared with those from the burst creep test of closed-end specimens. From the results, it could be seen an very strong relationship between them, especially in Larson-Miller parameter. So, it is expected that we can easily predict the creep properties of not only claddings but also various small pressure pipes using the ring creep test.
Novel Micro Gas Generator of Carbon Dioxide for Actuation and Gas Source
Choi Yo Han ; Son Sang Uk ; Lee Seung S. ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 7, 2005, Pages 970~975
DOI : 10.3795/KSME-A.2005.29.7.970
This paper presents a novel microgenerator of
(carbon dioxide) gas.
(sodium bicarbonate) in a chamber is decomposed by the underlaid microheater. Alternatively, water droplet is caged by paraffin layer and released by heating. The released water dissolve HOC(COOH)
(citric acid) powder and then,
reacts with the solubilized HOC(COOH)
is produced. Micropumps actuated by
generation were fabricated. A portable micro cell incubator of which pH is controlled by the produced
is also presented as one of the further applications.
Dynamic Response Analysis of Rotating Functionally Graded Thin-Walled Blades Exposed to Steady High Temperature and External Excitation
Na Sunsoo ; Oh Byungyoung ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 7, 2005, Pages 976~982
DOI : 10.3795/KSME-A.2005.29.7.976
This paper is dedicated to the thermoelastic modeling and dynamic response of the rotating blades made of functionally graded ceramic-metal based materials. The blades are modeled as non-uniform thin walled beams fixed at the hub with various selected values of setting angles and pre-twisted angles. In this study, the blade is rotating with a constant angular velocity and exposed to a steady temperature field as well as external excitation. Moreover, the effect of the temperature gradient through the blade thickness is considered. Material properties are graded in the thickness direction of the blade according to the volume fraction power law distribution. The numerical results highlight the effects of the volume fraction, temperature gradient, taper ratio, setting angle and pre-twisted angle on the dynamic response of bending-bending coupled beam characteristics and pertinent conclusions are outlined.
A Study on Frictional Characteristics and Polishing Result of SiO
Slurry in CMP
Lee Hyunseop ; Park Boumyoung ; Seo Heondeok ; Jung Jaewoo ; Jeong Sukhoon ; Jeong Haedo ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 7, 2005, Pages 983~989
DOI : 10.3795/KSME-A.2005.29.7.983
The effects of mechanical parameters on the characteristics of chemical mechanical polishing(CMP) can be directly evaluated by friction force. The piezoelectric quartz sensor for friction force measurement was installed, and friction force could be detected during CMP process. Furthermore, friction energy can be calculated by multiplying relative velocity by integration of the friction force throughout the polishing time.
slurry for interlayer dielectric(ILD) CMP was used in this experiment to consider the relation of frictional characteristics and polishing results. From this experiment, it is proven that the friction energy is an essential factor of removal rate. Also, the friction force is related to removal amount per unit length(dH/ds) and friction energy has corelation to the removal rate(dH/dt) and process temporature. Moreover, within wafer non-unifornity(WIWNU) is related to coefficient of friction because of the mechanical moment equilibrium. Therefore, the prediction of polishing result would be possible by measuring friction force.
Topology Optimization Using the Element Connectivity Parameterization Method in Three Dimensional Design Domain
Ho Yoon Gil ; Young Kim Yoon ; Soo Joung Yuung ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 7, 2005, Pages 990~997
DOI : 10.3795/KSME-A.2005.29.7.990
The objective of this paper is to present the element connectivity parameterization (ECP) fur three dimensional problems. In the ECP method, a continuum structure is viewed as discretized finite elements connected by zero-length elastic links whose stiffness values control the degree of inter-element connectivity. The ECP method can effectively avoid the formation of the low-density unstable elements. These elements appear when the standard element density method is used for geometrical nonlinear problems. In this paper, this ECP method developed fur two-dimensional problems is expanded to the design of three-dimensional geometrical nonlinear structures. Among others, the automatic procedure converting standard finite element models to the models suitable for the ECP approach is developed and applied for optimization problems defined on general three-dimensional design domains.
Fabrication of Three-Dimensional Micro-Shell Structures Using Two-Photon Polymerization
Park Sang Hu ; Lim Tae Woo ; Yang Dong-Yol ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 7, 2005, Pages 998~1004
DOI : 10.3795/KSME-A.2005.29.7.998
A nano-stereolithography (NSL) process has been developed for fabrication of 3D shell structures which can be applied to various nano/micro-fluidic devices. By the process, a complicated 3D shell structure on a scale of several microns can be fabricated using lamination of layers with a resolution of 150 nm in size, so it does not require the use of my sacrificial layer or any supporting structure. A layer was fabricated by means of solidifying liquid-state monomers using two-photon absorption (TPA) induced using a femtosecond laser processing. When the polymerization process is finished, unsolidified liquid state resins can be removed easily by dropping several droplets of ethanol fur developing the fabricated structure. Through this work, some 3D shell structures, which can be applied to various applications such as nano/micro-fluidic devices and MEMS system, were fabricated using the developed process.
A Study on Dynamic Characteristic Analysis for the Industrial Monorail Vehicle
Lee Soo-Ho ; Jung Il-Ho ; Lee Hyung ; Park Joong-Kyung ; Park Tae-Won ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 7, 2005, Pages 1005~1012
DOI : 10.3795/KSME-A.2005.29.7.1005
An OHT(Over Head Transportation) vehicle is an example of the industrial monorail vehicle, and it is used in the automobile, semiconductor, LCD manufacturing industries. OHT vehicle is moved by main wheels and guide rollers. The major function of the main wheel is to support and drive the OHT vehicle. The roles of the guide roller is the inhibition of derailment and steering of the OHT vehicle. Since the required vehicle velocity becomes faster and the required load capacity is increased, the durability characteristics of the wheel and roller, which was made of urethane, need to be increased. So it is necessary to estimate the fatigue life cycle of the wheel and roller. In this study, OHT dynamic model was developed by using the multi body dynamic analysis program ADAMS. Wheel and roller are modeled by the 3-D surface contact module. Especially, motor cycle tire mechanics is used in the wheel contact model. The OHT dynamic model can analyze the dynamic characteristic of the OHT vehicle with various driving conditions. And the result was verified by a vehicle traveling test. As a result of this study, the developed model is expected to predict wheel dynamic load time history and makes a contribution to design of a new monorail vehicle.
Shape Design of Passages for Turbine Blade Using Design Optimization System
Jeong Min-Joong ; Lee Joon-Seong ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 7, 2005, Pages 1013~1021
DOI : 10.3795/KSME-A.2005.29.7.1013
In this paper, we developed an automatic design optimization system for parametric shape optimization of cooling passages inside axial turbine blades. A parallel three-dimensional thermoelasticity finite element analysis code from an open source system was used to perform automatic thermal and stress analysis of different blade configuration. The developed code was connected to an evolutionary optimizer and built in a design optimization system. Using the optimization system, 279 feasible and optimal solutions were searched. It is provided not only one best solution of the searched solutions, but also information of variation structure and correlation of the 279 solutions in function, variable, and real design spaces. To explore design information, it is proposed a new interpretation approach based on evolutionary clustering and principal component analysis. The interpretation approach might be applicable to the increasing demands in the general area of design optimization.
The Effect of Milling Time and Speed on the Particle Size of Ibuprofen in the Cryogenic Ball Milling Process
Cho Hyun Kab ; Paik Young Nam ; Rhee Kyong Yop ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 7, 2005, Pages 1022~1027
DOI : 10.3795/KSME-A.2005.29.7.1022
In this study, ball milling process was applied to reduce the particle size of bio-material down to submicron size. The material used was Ibuprofen. The ball milling was performed at low temperature of about
. The effect of processing conditions (milling time, milling speed) on the particle size was determined. The results showed that the degree of crystallite of Ibuprofen was slightly reduced by the ball milling process. The results also showed that the size of Ibuprofen was significantly reduced by the ball milling process. The effect of milling time was significant within the milling time of six hours while it was small thereafter.
Failure Analysis of Optical Disk Drives Using the Vibration Signal Analysis
Park Youngpil ; Shin Changho ; Chung Jintai ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 7, 2005, Pages 1028~1034
DOI : 10.3795/KSME-A.2005.29.7.1028
In this paper, the failure analysis of an optical disk drive is carried out and the limit ranges of the misalignment f3r the higher performance are presented. Since optical disks are removable from optical disk drive, the translational and angular misalignments, which causes read/write errors, always exist. Therefore, the limit ranges of the misalignment should be investigated. For this reason, the failure analysis by the vibration analysis is studied. The influences of the misalignment are tested by the aging test. And the limit ranges of the misalignment are proposed for the reliability of optical disk drives.
A Study on the Vibration Reduction and Performance Improvement of the CD/DVD for the Vehicles
Park Youngpil ; Jung Duhan ; Chung Jintai ;
Transactions of the Korean Society of Mechanical Engineers A, volume 29, issue 7, 2005, Pages 1035~1041
DOI : 10.3795/KSME-A.2005.29.7.1035
Dynamic characteristics of CD/DVD deck fur vehicle are analyzed in this paper. Generally CD/DVD deck for vehicle is used from inferior environment with the vibration of the vehicle, shock of outside and so on. Therefore it must have the structure which is stabilized from the vibration to prevent read error. For this purpose, vibration characteristic of the deck for vehicle should be identified. To analyze characteristic of the deck system, we perform the signal analysis and modal testing using the EFT analyzer. Also we change the design factor degrading the performance of the deck system and verify the efficiency improvement using the acceleration measurement occurring to the sound discontinuation.