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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 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
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A CAD Model Healing System with Rule-based Expert System
Han Soon-Hung ; Cheon Sang-Uk ; Yang Jeong-Sam ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 3, 2006, Pages 219~230
DOI : 10.3795/KSME-A.2006.30.3.219
Digital CAD models are one of the most important assets the manufacturer holds. The trend toward concurrent engineering and outsourcing in the distributed development and manufacturing environment has elevated the importance of high quality CAD model and its efficient exchange. But designers have spent a great deal of their time repairing CAD model errors. Most of those poor quality models may be due to designer errors caused by poor or incorrect CAD data generation practices. In this paper, we propose a rule-based approach for healing CAD model errors. The proposed approach focuses on the design history data representation from a commercial CAD model, and the procedural method for building knowledge base to heal CAD model. Through the use of rule-based approach, a CAD model healing system can be implemented, and experiments are carried out on automobile part models.
Design and Implementation of Multichannel Visualization Module on PC Cluster for Virtual Manufacturing
Kim Yong-Sik ; Han Soon-Hung ; Yang Jeong-Sam ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 3, 2006, Pages 231~240
DOI : 10.3795/KSME-A.2006.30.3.231
Immersive virtual reality (VR) for the manufacturing planning helps to shorten the planning times as well as to improve the quality of planning results. However, VR equipment is expensive, both in terms of development efforts and device. Engineers also spend time to manually repair erroneous 3-D shape because of imperfect translation between 3-D engineering CAD model and VR system format. In this paper a method is proposed to link 3-D engineering CAD model to a multichannel visualization system with PC clusters. The multichannel visualization module enables distributed computing for PC clusters, which can reduce the cost of VR experience while offering high performance. Each PC in a cluster renders a particular viewpoint of a scene. Scenes are synchronized by reading parameters from the master scene control module and passing them to client scenes.
Experimental Study of Evaluating Shoe Cushioning System Using Shock Absorption Pocket
Sun Chang-Hwa ; Son Kwon ; Moon Byung-Young ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 3, 2006, Pages 241~248
DOI : 10.3795/KSME-A.2006.30.3.241
Shoe cushioning systems are important to prevent body injuries. This study developed and evaluated a cushioning system to reduce impact force on the heel. The cushioning system suggested consist of a polyurethane pocket, which contains water and porous grains of open cell to dissipate the energy effectively. Load-displacement curves fer the shoe cushioning system were obtained from an instrumented testing machine and the results were compared with various pockets with air, water or grains. Mechanical testings showed that the pocket with 5g porous grain was the best for the cushioning system. This system can be applied to the design of various kind of sport shoes.
Stress and Displacement fields of a Propagating Mode III Crack in Orthotropic Functionally Gradient Materials with Property Gradation Along X Direction
Cho Sang-Bong ; Lee Kwang-Ho ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 3, 2006, Pages 249~259
DOI : 10.3795/KSME-A.2006.30.3.249
Stress and displacement fields of a propagating Mode III crack in an orthotropic functionally gradient material (OFGM), which has (1) linear variation of shear modulus with a constant density, and (2) an exponential variation of shear modulus and density, are derived. The equations of motion in OFGM are developed and solution to the displacement and stress fields fer a propagating crack at constant speed though an asymptotic analysis. The stress terms associated with
are not affected by the FGM constant
which is nonhomogeneous parameter, only on the higher order terms, the influences of nonhomogeneity on the stress are explicitly brought out. When the FGM constant
, the fields for OFGM are almost same as the those for homogeneous orthotropic material. Using the stress components, the effects of nonhomogeneity on stress components are discussed.
Interfacial Strain Distribution of a Unidirectional Composite with Randomly Distributed Fibers
Ha Sung-Kyu ; Jin Kyo-Kook ; Oh Je-Hoon ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 3, 2006, Pages 260~268
DOI : 10.3795/KSME-A.2006.30.3.260
The micromechanical approach was used to investigate the interfacial strain distributions of a unidirectional composite under transverse loading in which fibers were usually found to be randomly packed. Representative volume elements (RVE) for the analysis were composed of both regular fiber arrays such as a square array and a hexagonal array, and a random fiber array. The finite element analysis was performed to analyze the normal, tangential and shear strains at the interface. Due to the periodic characteristics of the strain distributions at the interface, the Fourier series approximation with proper coefficients was utilized to evaluate the strain distributions at the interface for the regular and random fiber arrays with respect to fiber volume fractions. From the analysis, it was found that the random arrangement of fibers had a significant influence on the strain distribution at the interface, and the strain distribution in the regular fiber arrays was one of special cases of that in the random fiber array.
Fully Plastic Analyses of Unequally Notched Specimens in Bending Moment
Oh Chang-Kyun ; Park Jin-Moo ; Kim Yun-Jae ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 3, 2006, Pages 269~278
DOI : 10.3795/KSME-A.2006.30.3.269
This paper proposes slip line fields for bending of unequally notched specimens in plane strain that have a sharp crack in one side and a sharp V-notch in the other side. Depending on the back angle, two slip line fields are proposed, from which the limit moment and crack tip stress fields are obtained as a function of the back angle. Excellent agreement between slip line field solutions with those from detailed finite element limit analysis based on non-hardening plasticity provides confidence in the proposed slip line fields. One interesting point is that, for the unequally notched specimen, the difference between the crack tip triaxial stress for tension and that for bending increases significantly with increasing the back angle. This suggests that such a specimen could be potentially useful to investigate the crack tip constraint effect on fracture toughness of materials. In this respect, the possibility of designing a new toughness testing specimen with varying crack tip constraint is discussed.
Vibration Analysis of Euler-Bernoulli Beam with Open Cracks on Elastic foundations Using Differential Transformation Method and Generalized Differential Quadrature Method
Hwang Ki-Sup ; Yun Jong-Hak ; Shin Young-Jae ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 3, 2006, Pages 279~286
DOI : 10.3795/KSME-A.2006.30.3.279
The main purpose of this paper is to apply differential transformation method(DTM) and generalized differential quadrature method(GDQM) to vibration analysis of Euler-Bernoulli beam with open cracks on elastic foundation. In this paper the concepts of DTM and GDQM were briefly introduced. The governing equation of motion of the beam with open cracks on elastic foundation is derived. The cracks are modeled by massless substitute spring. The effects of the crack location, size and the foundation constants, on the natural frequencies of the beam, are investigated. Numerical calculations are carried out and compared with previous published results.
Modeling and Experimental Validation of Earthworm-like Robot
Park Suk-Ho ; Kim Byung-Kyu ; Kwon Ji-Woon ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 3, 2006, Pages 287~294
DOI : 10.3795/KSME-A.2006.30.3.287
In recent years, capsule endoscope is highlighted for the patient's convenience and the possibility of the application in the small intestine. However, the capsule endoscope has some limitations to get the image of the digestive organ because its movement only depends on the peristaltic motion. In order to solve these problems, locomotion of capsule endoscope is necessary. In this paper, we analyze the locomotive mechanism of earthworm-like robot proposed as locomotive device of capsule endoscope and derive the condition which can Judge the possibility of its mobility using theoretical analysis. Based on a biomechanical modeling and simulation, the critical stroke, that is minimum stroke of the earthworm-like robot to perform motion inside small intestine, is obtained. Also, this derived critical stroke can be validated by the moving test of fabricated earthworm-like robot. Consequently, it is expected that this study can supply useful information to design of earthworm-like robot for mobility of capsule endoscope.
Maximum Braking Force Control Using Wheel Slip Controller and Optimal Target Slip Assignment Algorithm in Vehicles
Hong Dae-Gun ; Hwang In-Yong ; SunWoo Myoung-Ho ; Huh Kun-Soo ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 3, 2006, Pages 295~301
DOI : 10.3795/KSME-A.2006.30.3.295
The wheel slip control systems are able to control the braking force more accurately and can be adapted to different vehicles more easily than conventional ABS systems. In order to achieve the superior braking performance through the wheel-slip control, real-time information such as the tire braking force at each wheel is required. In addition, the optimal target slip values need to be determined depending on the braking objectives such as minimum braking distance, stability enhancement, etc. In this paper, a robust wheel slip controller is developed based on the adaptive sliding mode control method and an optimal target slip assignment algorithm. An adaptive law is formulated to estimate the longitudinal braking force in real-time. The wheel slip controller is designed using the Lyapunov stability theory and considering the error bounds in estimating the braking force and the brake disk-pad friction coefficient. The target slip assignment algorithm is developed for the maximum braking force and searches the optimal target slip value based on the estimated braking force. The performance of the proposed wheel-slip control system is verified In simulations and demonstrates the effectiveness of the wheel slip control in various road conditions.
Optimum Design of a Y-channel Microcmixer for Enhanced Mixing
Shin Yong-Su ; Choi Hyung-Il ; Lee Dong-Ho ; Lee Do-Hyung ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 3, 2006, Pages 302~309
DOI : 10.3795/KSME-A.2006.30.3.302
Effective mixing plays a crucial role in microfluidics for biochemical applications. Owing to the small device scale and its entailing the low Reynolds number, the mixing in microchannels proceeds very slowly. In this work, we optimize the configuration of obstacles in the Y-channel mixer in order to attain maximum mixing efficiency. Before the optimum design, mixing characteristics are investigated using unstructured grid CFD method. Then, the analysis method is employed to construct the approximate analysis model to be used in the optimization procedure. The main optimization tool in the present work is sequential quadratic programming method. Using this approximate optimization procedure, we may obtain the optimum layout of obstacles in the Y-channel mixer in an efficient manner, which gives the maximum mixing efficiency.
Efficient Vibration Simulation Using Model Order Reduction
Han Jeong-Sam ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 3, 2006, Pages 310~317
DOI : 10.3795/KSME-A.2006.30.3.310
Currently most practical vibration and structural problems in automotive suspensions require the use of the finite element method to obtain their structural responses. When the finite element model has a very large number of degrees of freedom the harmonic and dynamic analyses are computationally too expensive to repeat within a feasible design process time. To alleviate the computational difficulty, this paper presents a moment-matching based model order reduction (MOR) which reduces the number of degrees of freedom of the original finite element model and speeds up the necessary simulations with the reduced-size models. The moment-matching model reduction via the Arnoldi process is performed directly to ANSYS finite element models by software mor4ansys. Among automotive suspension components, a knuckle is taken as an example to demonstrate the advantages of this approach for vibration simulation. The frequency and transient dynamic responses by the MOR are compared with those by the mode superposition method.
Proposal of Equation on Changable Performance Stroke (Δ h) and Radius of Curvature (ρ) According to the CERP Ply Orientation in PZTCA
Hong Jung-Hwa ; Yoon Kwang-Joon ; Kim Cheol-Woong ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 3, 2006, Pages 318~327
DOI : 10.3795/KSME-A.2006.30.3.318
Due to the diversified use of recent Piezoelectric Zirconate Titanate Composite Actuate. (PZTCA), various PZTCAs with the different ply orientation of the fiber layer have been applied. For this reason, the applicable bending moment equation is necessary even though the fiber layer ply orientation and the laminate configuration are changed. The aim of this research is to evaluate the relationship between the total effective moment
and Bernoulli-Euler bending moment (M) when the ply orientations of UD CFRP are changed. In conclusions, firstly, as the performance test results by the CFRP ply orientation, the performance of  and  were stable. However, while the performance of [+45] was suddenly decreased after 5 hours. Secondly, the change of
by the CFRP ply orientation was evaluated. As the CFRP ply orientation was increased from  to [+60], the
were gradually decreased. However, they became a little bit increased from [+60] to . Finally, after the change of M by the CFRP ply orientation was evaluated, it was found that
was valid for just  and that there was a relationship between
and M according to the ply orientation.
Fabrication of Movable Nanostructures by Selective Etching of Nanoplates
Yun Yong-Ju ; Ah Chil-Seong ; Yun Wan-Soo ; Ha Dong-Han ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 3, 2006, Pages 328~333
DOI : 10.3795/KSME-A.2006.30.3.328
Movable nanometer-scale structures are fabricated by selective etching of single crystalline Au nanoplates. The nanostructures have arbitrary shapes like gear and alphabet 'A' with in-plane size less than 500 m and thickness of
. They could be moved successfully on the substrate using a nanornanipulator installed in a focused ion beam system. Our approach is expected to be useful in fabricating various kinds of nanocomponents which can play a role as building blocks for the sophisticated nanodevices or micromachines.
Fabrication of Part and Its Evaluation Using Dual Laser in Solid Freeform Fabrication System
Choi Jae-Won ; Kim Dong-Soo ; Doh Yang-Hoe ; Lee Seok-Hee ; Choi Kyung-Hyun ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 3, 2006, Pages 334~341
DOI : 10.3795/KSME-A.2006.30.3.334
A solid freeform fabrication (SFF) system using selective laser sintering (SLS) is currently recognized as a leading process and the SLS extends the applications to machinery and automobiles due to various employing materials. In order to fabricate a large part with SFF system, dual laser approach has been introduced. Since the building room is divided into two regions, each scan path for dual laser system is generated based on the single laser scan path. Scan paths for each laser have to be synchronized and consider mechanical strength against fracture at the interfaced region. This paper will address generation of single laser scan path which deals with special cases for unnecessary scan points and generation of dual laser scan path according to various divided regions to enhance mechanical strength. To evaluate the developed scan path method, the specimen will be fabricated and evaluated.
Generation and Detection of Torsional Waves in a Rotating Shaft Using a Magnetostrictive Patch Array
Cho Seung-Hyun ; Han Soon-Woo ; Park Chan-Il ; Kim Yoon-Young ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 3, 2006, Pages 342~348
DOI : 10.3795/KSME-A.2006.30.3.342
A new magnetostrictive patch array transducer for the generation and detection of torsional waves is developed fur the on-line health monitoring of rotating shafts. Even though the torsional wave is useful in nondestructive evaluation due to its non-dispersive property, a transducer generating torsional waves in rotating shafts has not been developed so far. In this research, a torsional wave transducer using the magnetostrictive effect is newly developed. By bonding an away of magnetostrictive rectangular patches on the outer surface of the shaft at an oblique angle of
and encircling the array by a solenoid coil, we have successfully generated and measured torsional waves by the developed transducer. Several experiments were carried out to check the transducer performance.
Properties Variation According to Heat Treatment for Gas Turbine Blade(Bucket) Material of GTD-111DS
Park Sang-Yeal ; Yang Sung-Ho ; Kim Moon-Young ;
Transactions of the Korean Society of Mechanical Engineers A, volume 30, issue 3, 2006, Pages 349~355
DOI : 10.3795/KSME-A.2006.30.3.349
The gas turbine components is used on high temperature conditions which under severely circumstance with start-up and stop several times. Therefore, it is used nickel-base superalloys like and GTD-111DS. Damaged buckets on the t긴ade tip during operating are repaired per 24,000 hr to three times according to repair specification of manufacture. It is applied pre-heat, HIP(hot isostatic pressing) and post-heat treatment to support welding repair on blade tip effectively. On this study, It is utilize of
(welding repair advanced process) method to make tension test specimens for this study, And then, material strength and characteristic for GTD-111DS was analyzed.