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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 20, Issue 12 - Dec 1996
Volume 20, Issue 11 - Nov 1996
Volume 20, Issue 10 - Oct 1996
Volume 20, Issue 9 - Sep 1996
Volume 20, Issue 8 - Aug 1996
Volume 20, Issue 7 - Jul 1996
Volume 20, Issue 6 - Jun 1996
Volume 20, Issue 5 - May 1996
Volume 20, Issue 4 - Apr 1996
Volume 20, Issue 3 - Mar 1996
Volume 20, Issue 2 - Feb 1996
Volume 20, Issue 1 - Jan 1996
Selecting the target year
Design, Microfabricaiton and Testing of Laterally-Resonating Polysilicon Microactuators
Jo, Yeong-Ho ;
Transactions of the Korean Society of Mechanical Engineers A, volume 20, issue 5, 1996, Pages 1363~1371
DOI : 10.22634/KSME-A.19188.8.131.523
This paper presents the design, fabrication, and testing of polysilicon electrostatic microactuators that resonate in the direction parallel to the silicon susbstrates. A set of six different designs has been developed using a theoretical model and design formulae developed for the mocroactuators. Microactuator prototypes are fabricated from a 2.1
-thick LPCVD polysilicon film, using a 4-mask surface-micromachining process. The prototypes are tested under a d.c. bias voltage of 45V with an a.c. drive voltage amplitude of 20 v.Measured resorant frequencies are in the ranges of 40-60 kHz, showing a good agreement to their theoretical estimates within error bounds of .
.5%. Important issues inthe design and microfabrication of the microactuators are discussed, together with potential applicaitons of the key technology involved.
A Study on the Variation of Mechanical Properties Due to Thermal Aging in 2.25Cr-1Mo Boiler Tube Steel
Jeong, Hee-Don ;
Transactions of the Korean Society of Mechanical Engineers A, volume 20, issue 5, 1996, Pages 1372~1381
DOI : 10.22634/KSME-A.19184.108.40.2062
As recieved boiler tuve steel was aged artificially at
for various time duration to simulate the material deterioration which could be occurred during the operation of fossiol power plants. And the tensile tests, the microhardness tests and the characterization of carbides formed in the aging process were performed to asses the relationship between the mechanical properties and the effect of thermal aging. Furthernore, the amout of Mo-rich carbide were investigated by ondestructive method by noticing the fact that formation of Mo-rich carbide were investigated by ondestructive melthod by noticing the fact that formation of Mo-rich carbides(
) which stabilizes lastly affects the mechanical properties. It was known that the microhardness results of service exposed materials were similar to the ones which are aged at
. The room temperature measurement showed small variation in the yield points and ultimate strength in materials aged at
. Those properties at
showed the abrupt decrease compared with as received material even if short aging time. And it was found that
aging cause different effects on mechanical properties, although the temperature time parameters(LMP;Larson-Miller parameter) are same. And it was concluded that the aigng at
is more appropriate to simulate the service exposed condition. Finally, the relationship between high temperature tensile properties and Ip values were established, which offers a potential way of reliability tests onthe power plant components.
Applicatio of Finite Element and Boundary Element Methods to Predict Steady-State Response of a Structure-Acoustic-Cavity System
Lee, Cang-Myung ;
Transactions of the Korean Society of Mechanical Engineers A, volume 20, issue 5, 1996, Pages 1383~1391
DOI : 10.22634/KSME-A.19220.127.116.113
The steady-state response for a coupled structure-acoustic-cavity systme has been investigated by numerical technique using a directly coupled finite element method(FEM) and Boundary Element Method(BEM) model. The Laplace tranformed matrix equations for the structure and the acoustic cavity are coupled directly satisfying the necessary equilibrium and compatibility conditions. The coupled FEM-BEM code is verified by comparing its prediction for an example with known analytical, numerical and experimental results. The example involves a coupled structure-acoustic-cavity system which is a box-type cavity with one end as experimentally excited pinned-pinned plate.
Prediction of Fatigue Life Using Dynamic Simulation and Finite Element Anlaysis for Construction Equipment
Kwon, Soon-Ki ; Park, Hyung-Jin ;
Transactions of the Korean Society of Mechanical Engineers A, volume 20, issue 5, 1996, Pages 1392~1400
DOI : 10.22634/KSME-A.1918.104.22.1682
The need of companies shorten the design-to-manufacturing process for new products with improved quality in cost effective manner places increasing demends on engineers to simulate the performance characteristics of a design before it is built of a prototype is developed. For theses demands CAE(Computer-Aided Engineering) offers engineers not only giving confidence of their design but also eliminating potential errors due totesting prototypes in small numbers. This paper present the method to predict the fatigue life using dynamics simulation and FEA(Finite Element Analysis) for construciton equipment in the computer before building prototype. The dynamicsimulatio is to get the load-time history corresponding to the maneuvering and driving of the construction equipment. The FEA is to build a model of the structure and then analyse to define the local stress response to applied loadings using linear static analysis.
Development of Simulation System for Front Attachment of Excavator
Gwon, Sun-Gi ; Park, Hyeong-Jin ; Kim, Hyeong-Geun ;
Transactions of the Korean Society of Mechanical Engineers A, volume 20, issue 5, 1996, Pages 1401~1410
DOI : 10.22634/KSME-A.1922.214.171.1241
This paper present a method to predict fatigue life of a construction equipment performing static stress analysis and dynamic stress analysis using the computer simulation for proto and pilot type model. The parameter of design variable is used for finite elemt modeling of a excavator. Desinger can design reliable product and shorten lead time by using "Simulation System for Front Attachment of Excavator" develped in this study.his study.
Vibration Diagnosis Method for Rotating Machinery Using Fuzzy Theory
Yang, Bo-Suk ; Jun, Soon-Ki ; Kim, Ho-Jong ;
Transactions of the Korean Society of Mechanical Engineers A, volume 20, issue 5, 1996, Pages 1411~1418
DOI : 10.22634/KSME-A.19126.96.36.1991
Large scale plants are equipped with a number of the rotating machineries which ocuupy important positions in the plant system. Therefore, the most important one is a vibraiton diagnostic thchnology which can detect quickly any abnormal symptom of operating malfunction and guve operational and inspection guides adequately. A new diagnosis method is developed in this paper, in which the fuzzy set theory is introduced to diagnose the defects of ratating machinery. The selection of memgership function and the fuzzy operation model are discussed in datail here. The systme is sucessfully used for various defacts diagnosis of rotating machinery. The result indicate that realixtic application can be builtusing this approach.
Modeling and Analysis of a Friction Drive Type Precise Actuator
Kim, Sang-Chae ; Kim, Soo-Hyeon ; Park, Kyi-Hwan ; Kwak, Yun-Keun ;
Transactions of the Korean Society of Mechanical Engineers A, volume 20, issue 5, 1996, Pages 1419~1425
DOI : 10.22634/KSME-A.19188.8.131.529
In this work, a precies actuator which is capable of high positioning accuracy is developed. For estimation the dynamic behavior of the actuator, system modeling is performed by employing a stick-slip frection law. Dynamic characteristics over various types of driving input signals and vibraiton loci of the driving tip are examined by experiments. Phase differences between the input signals are applied, and the dynamic behavior of slider is investigated. From the simulation and experimental results, it is observed that the dynamic behaviors from the simulation results agree fairly well to those of the experimental results. Thisindicates that the model developed in this work is applicable to other precision mechanisms in which a friction farce is as improtant factor for actuation.
Analysis of Power Transmission Characteristics for Hydro-mechanical Transmission Using Extended Tetwork theory
Kim, Won ; Chung, Soon-Bae ; Kim, Hyun-Soo ;
Transactions of the Korean Society of Mechanical Engineers A, volume 20, issue 5, 1996, Pages 1426~1435
DOI : 10.22634/KSME-A.19184.108.40.2066
In this paper. a network theory for generaltransmission systme was extended considering the direction of power flow. Also, a modified network model was suggested for a node with 4 shafts in order to verify the power flow. Based on the extended network theory, a simulation program was developed to analyze a hydro-mecaanical tranmission(HMT) system consistion of two hydrostatic pump motors, severeal planetary gear trains steer differential gear. The simulation result showed that the extendednotwork analysis program develped can predict the power circulation as well as the magnitude of torque and speed for each transmission element and can be used design tool for genaral power transmission system.
Buckling of Composite Cylindrical Shells Sugjected ot Torsion of Lateral Pressure
Han, Byeong-Gi ; Lee, Seong-Hui ; Yu, Taek-In ;
Transactions of the Korean Society of Mechanical Engineers A, volume 20, issue 5, 1996, Pages 1436~1444
DOI : 10.22634/KSME-A.19220.127.116.116
The problem ofinstability of laminated circular cylindrical shell under the action of torsio or lateral pressure is investigated. The analysis is based on the Sander's theory for finite deformations of thin shell. The buckling is elastic for thin compoisite shell nad the geometry is assumed to be free of initial imperfections. The equilibrium equations are obrained by usitn the p[erturbation technique. Solution procedure is based on the Galerkin mehtod. The computer program for numerical results is made for several stacking sequence, length-to-radius ratio, and radius-to-thickness ratio. The numerical results of buckling load are present.
A Study on the Joint Stiffness of Automotive Structural Model
Mun, Yong-Mo ; Jee, Tae-Han ; Park, Young-Pil ;
Transactions of the Korean Society of Mechanical Engineers A, volume 20, issue 5, 1996, Pages 1445~1457
DOI : 10.22634/KSME-A.1918.104.22.1685
In building a finite element model of as automotive structure, the pillars and rockers are generally modeled as beam elemnts. The finite elemtns modeling using beam is faster and more efficient than that using shell elemetns. A joint is defined as theintersectio region of beam elemts and generally modeled with coupled rotational springs. In this study, hoint modeling technique is presented. First, the definitions of and anlaysis hypothesis for the joint are defined. Second the evaluation method of the joint stiffness from the static test is proposed. This method is simpler than existing evaluaiton methods. Third, the sensitivity analysis method and updating algorithm forjoint stiffness are presented. To verify these melthods, the finite element results of structural models with rigid joints and rotational spring joints are compared with experimental results.
Direct Differentiation Method for Shape Design Sensitivity Analysis of Axisymmetric Elastic Solids by the BEM and Shape Optimization of Turbin Disc
Lee, Bu-Yun ;
Transactions of the Korean Society of Mechanical Engineers A, volume 20, issue 5, 1996, Pages 1458~1467
DOI : 10.22634/KSME-A.1922.214.171.1248
A direct differentiationmethod is presented for the shape design sensitivity analysis of axisymmeetric elastic solids. Based on the exisymmetric boundary integralequaiton formulation, a new boundary ntegral equatio for sensitivity analysis is derived by taking meterial derivative to the same integral identity that was used in the adjoint variable melthod. Numerical implementation is performed to show the applicaiton of the theoretical formulation. For a simple example with analytic solution, the sensitivities by present method are compared with analytic sensitivities. As an application to the shape optimization, an optimal shape of a gas turbine disc toinimize the weight under stress constraints is found by incorporating the sensitivity analysis algorithm in an optimizatio program.
Effect of Machining Condition on Friction and Wear of Steel
Cheong, Chong-Hyeon ; Kim, Dae-Eun ;
Transactions of the Korean Society of Mechanical Engineers A, volume 20, issue 5, 1996, Pages 1468~1476
DOI : 10.22634/KSME-A.19126.96.36.1998
Surface integrity is dictated by the fabrication process of the metal part. In this work, steel specimens were prepared under various mechine conditions to achieve different degrees of deformation state. The tribological characteristics of the speciments were tested using a pin-on-disk type apparatus and other surface characterization tools. It is shown that though frictional characteristics are similar, the wear rate is significantrly affected by the properties of the surface. In the case of steel, surface cracks resulted in high wear despite the relatively high hardness of the specimen. Also, the sliding action were found to reduce the residual stress on the surface. These results indicate that there is a strong relationship between surface integrity and the tribological properties of steel, and therefore the machining condition should be optimized woth respect to tribological performance of a steel part
Static and Dynamic Characteristics of the Spindle Bearing System with a Gear Located on the Bearing Span
Choe, Jin-Gyeong ; Big, Gyu-Yeol ; Lee, Dae-Gil ;
Transactions of the Korean Society of Mechanical Engineers A, volume 20, issue 5, 1996, Pages 1477~1485
DOI : 10.22634/KSME-A.19188.8.131.527
Since the spindle bearing systme is the main source of the total cutting point compliance of machine tool structures, in this work, the static and dynamic characteristics of the spndle bearing systme driven by the gear located on the bearing span were investigated using analytical and finite elemtn methods to improve the performance of the spindle bearing system. Based on the theretical results, a specially designed prototype spindle bvearing systme was manufactured. Using the manufactured spindle bearing system, the static and dynamic characteristics were measured. From the comparison of the experimental results with the theoretical results, it was found that the finite elemetn method predicted well the static and dynamic characteristics of the spindle bearing system.
Analysis of Three-Dimensional Rigid-Body Collisions with Friction -CoIlisions between EIlipsoids-
Han, In-Hwan ; Jo, Jeong-Ho ;
Transactions of the Korean Society of Mechanical Engineers A, volume 20, issue 5, 1996, Pages 1486~1497
DOI : 10.22634/KSME-A.19184.108.40.2066
The problem of determining the 3-demensional motion of any two rough bodies after a collision involves some rather long analysis and yet in some points it differs essentially from the corresponding problem in tdwo dimensions. We consider a special problem where two rough ellipsolids moving in any manner collide, and analyze the three dimensional impact process with Coulomb friction and Poisson's hypothesis. The differential equations that describe that process of the impact induce a flow in the tangent velocity space, the flow patterns characterize the possible impact cases. By using the graphic method in impulse space and numerical integration thchnique, we analyzed the impact process inall the possible cases and presented the algorithm for determining the post-impact motion. The principles could be applied to the general problem in three dimensions. We verified the effectiveness of the analysis results by simulating the numerous significant examples.
Robust Tracking Control of Smart Flexible Structures Featuring Piezofilm Actuators
Lee, Chul-Hee ; Choei-Seung-Bok ;
Transactions of the Korean Society of Mechanical Engineers A, volume 20, issue 5, 1996, Pages 1498~1507
DOI : 10.22634/KSME-A.19220.127.116.118
This paper presents a robust control of a smart flexible structure featured by a piezofilm actuator characterizing its light weght and quick response time. A mathematical governing equation for the proposed structure is derived by employing Hamilton's principle and a state space control model is subsequentrly obtained through modal analysis. Uncertain system parameters such as frequency variation are included in the control model. A sliding mode control theroy thich has inherent robustness to systme uncertainties is adopted to design a tracking controller for the peizofilm actuator. Using the output informaiton from the tip deflection sensor, a full-order observer is constructed ot estimate state variables for the system. Tracking performances for desired trajectories of sinusoidal amd step functions are evaluated by undertaking both simulation and experimental works.
Application of the Concept of a sSnsitivity Linkage for the Analysis of Mechanical Error in 4-Bar Mechanism
Sin, Jae-Kyun ; Choi, Hong-Suck ;
Transactions of the Korean Society of Mechanical Engineers A, volume 20, issue 5, 1996, Pages 1508~1515
DOI : 10.22634/KSME-A.1918.104.22.1688
The method of utilizing sensitivity linkages for the analysis of mechanical errors are proposed. As sources of the mechanical error, tolerances in the link length and clearances in thejoints are considered. It is demonstrated that the problem of calculating mechanical errors of a 4-bar mechanism can be transformed into a problem of conventeional velocity analysis of a sensitivity linkage. As a result of the present study, it is found and proved that the mechanical error of the output angle in the 4-Bar mechaism is represented as a simple harmonic function with respect to the relative position of the pin on the clearance circle. Also the vector representing the mechanical error of a coupler point makes, in general, an ellipse as the relative angle varies on the clearance circle. With these results we can better identify the characteristic of the mechanical errors in linkages.
Anisotropy due to Texture Development in FCC Polycrystals
Kim, Eung-Zu ; Lee, Yong-Shin ;
Transactions of the Korean Society of Mechanical Engineers A, volume 20, issue 5, 1996, Pages 1516~1523
DOI : 10.22634/KSME-A.1922.214.171.1246
The present study is concerned with the development of anisotropy and deformation texture in polycrystals. The individual grain in an aggregate is assumed to experience the viscoplastic dedformation with crystallographic slip that unsure uniquenessof the active slip systems and shearing rate onthese systems. Two different methods for updating the grain orientation are examined. Texture development for some deformation modes such as plane strain compression, uniaxial tension and simple shear are found. Changes in anisotropic flow potential due to texture development during large deformation are also given. Anisotropic behavior of polycrystals with defferent textures are examined.
Accurate Measurement of Residual Stresses of Glass Rods by Photoelasticity
Baek, Tae-Hyun ;
Transactions of the Korean Society of Mechanical Engineers A, volume 20, issue 5, 1996, Pages 1524~1533
DOI : 10.22634/KSME-A.19126.96.36.1994
Risidual stress of cylindrical glass rods are measured by photoelasticity to study the variation of stresses with respect to heat treatment temperatures. In order to measure the stresses accurately, fringe sharpening and multiplication techniques are applied to the determination of photoelastic fringe orders. Filon's separationmethod is used to resolve circumferential and redial stress ocmponents from isochromatic fringes which are the same as in-plane maximum shearing stresses. According to the photoelastic measurements, residual stress is increased as the heat treatment temperature of the rods is raised from
All the circumferential stress components are changed from tensile stresses to compressive ones at approximate
= 0.6, where
/ is outer radius and
any measured radius. This analysis shows that residual stresses of the glass rods approach zero if the rods are heat-treated near the strain point.
A Study on the Vibration Characteristics of Helical Gears with Tooth Errors
Park, Chan-Il ; Lee, Jang-Moo ;
Transactions of the Korean Society of Mechanical Engineers A, volume 20, issue 5, 1996, Pages 1534~1542
DOI : 10.22634/KSME-A.19188.8.131.524
Gear vibration is caused by the mesh stiffness, gear accuracy, and assembling errors. For these reasons, helical gear has the azial, radial, and rotational vibrations. In this study, the mesh stiffness is calculated by considering the tooth bending, contact, and foundation deformations. Rotational vibration of helical gear with tooth error is modeled by the nonlidear equation of motion with single degree of freedom and is anlyzed numerically. Also, by a specially designed experimental set-up, the analysis are cross-checked and the vibration characteristics of helical gear are discussed.
Failure Model for the Adhesively Bonded Tubular Single Lap Joints Under Static Tensile Loads
Kim, Yeong-Gu ; Lee, Su-Jeong ; Lee, Dae-Gil ;
Transactions of the Korean Society of Mechanical Engineers A, volume 20, issue 5, 1996, Pages 1543~1551
DOI : 10.22634/KSME-A.19184.108.40.2063
The static tensile load bearing capability of as adhesively-bonded tubular single lap jint that is calculated usign the linear mechanical properties of adhesive is usually far from the experimentally determined because the majority of the load transfer of the adhesively-bonded jointd is accomplished by the nonlinear behavior of the rubber-toughened eoxy adhesive. In this paper, both the nonlinear mechanical properties and the fabrication residual thermal stresses of adhesive were included in the calculation of the stresses of adhesively-bonded joints. The onlinear tensile properties of adhesive were approximated by an exponential form which was represented by the initial tensile modulus and ultimate tensile stength of adhesive. The stress distribution in the adhesive were calculated by applying the load obtained from the tensile tests. From the tensile tests and the stress analysis of adhesively-bonded hoints, the failure model for adhesively-bonded tubular single lap joints was proposed.
Fatigue Life Prediction of
/Al Composites by Using the Monte-Carlo Simulation
Ahn, Jeong-Ju ; Kwon, Jae-Do ; Kim, Sang-Tae ;
Transactions of the Korean Society of Mechanical Engineers A, volume 20, issue 5, 1996, Pages 1552~1561
DOI : 10.22634/KSME-A.19220.127.116.112
It requires uch time and cost to obtain the fatigue crack growth life and fatigue crack growth path morphlogy from the fatigue crack growth tests. In this study, the Monte-Carlo simulation program was developed to predict the fatigue crack growth lofe and fatigue crack growth path morphology of metal matrix composites. Fatigue crack growth lives of 5%, 10%, 15%, 20%, 25% and 30%
/Al composites were predicted by usign the Monte-Carlo Simulation. And the fatigue crack growth lives of 25%
/Al and Almatrix from Monte-carlo simulation were compared with fatigue life from experiments in order to verify the accuracy of Monte-Carlo Simulation program.
High-Velocity Deformation Analysis Using the Rigid-Plastic Finite Elemement Method Considering Inertia Effect
Yoo, Yo-Han ; Park, Khun ; Yang, Dong-Yol ;
Transactions of the Korean Society of Mechanical Engineers A, volume 20, issue 5, 1996, Pages 1562~1572
DOI : 10.22634/KSME-A.1918.104.22.1682
The rigid-plastic finite element formulation including the inertia force is derived and then the rigid-plastic finite elemnt program considering the inertia effect is developed. In order to consider the strain hardening, strain rate hardening and thermal softening effects which are frequentrly observed in high-velocity deformation phenomena, the Johnson-Cook constitutive odel is applied. The developed program is used to simulate two high-velocity deformation problemss ; rod impact test and hdigh-velocity compression precess. As a result of rod impact test simulation, it is found that the siulated result has a good agreement with the experimental observation. Through the high-velocity compression process simulation. it is also found that the accuracy of the simulated results is dependent upon the time increment size and mesh size.
Active Noise Control Using Sensory Actuator
Go, Byeong-Sik ;
Transactions of the Korean Society of Mechanical Engineers A, volume 20, issue 5, 1996, Pages 1573~1581
DOI : 10.22634/KSME-A.1922.214.171.1243
This paper present as experimental demonstratio of DSP and a sensory actuator that is used to actively control sound transmission/radiation through a vibrating plate. A plane acoustic wave incident on a clamped, thin circular plate was used as a noise source, and a sensory actuator bounded to the plate was used to control and sense vibration of the plate. The sound transmission reduction problem was tranformed as a structural vibration control problem that actively control the structural vibration modes coupled to acoustic modes. The results show that the first structural vibration mode is controlled with a reduction of 78 percent in the displacement and velocity of the plate. This corresponds to a 13dB reduction in the acoustic response. These experimental results indicate that a sensory actuator bounded to the plate can be employed to attenuate the sound transmitted to radiated from the plate.
Development of Prototyping and Die/Mold Manufacturing Technology using Rapid Prototyping(SLA)
Park, Geun ; Lee, Sang-Chan ; Jeong, Jun-Ho ; Yang, Dong-Yeol ; Yun, Jae-Ryun ;
Transactions of the Korean Society of Mechanical Engineers A, volume 20, issue 5, 1996, Pages 1582~1589
DOI : 10.22634/KSME-A.19126.96.36.1992
Rapid prototyping is a new prototyping technology which produces three dimensional part models directrly from CAD data and has been extensively applied to various manufacturing processes. There are many types of rapid prototyping systems due to their building principles and materials. In this work, Stereolithography Appaaratus(SLA) which is the most widely-used rapid prototyping system is introduced to achieve die/mold technology innovation. For the purpose, the prototyping technology using SLA is developed such that patterns of which shapes are quite complicated are successfully produced with high accuracy. Using these patterns, prototype die/molds are efficientrly manufactured; a turbocharger rotor, a fan and a wheel patterns, prototype die/molds are efficienterly manufactured ; a turbochager rotor, a fan and a wheel pattern are made, and the molds of the investment casting, the injection molding and the die casting are manufactured respectively. The casting products are produced using these molds and it turns out that these methods are quitre effective for manufacturing products of complicated geometry from the viewpoint of efficiency and productivity.