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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 36, Issue 12 - Dec 2012
Volume 36, Issue 11 - Nov 2012
Volume 36, Issue 10 - Oct 2012
Volume 36, Issue 9 - Sep 2012
Volume 36, Issue 8 - Aug 2012
Volume 36, Issue 7 - Jul 2012
Volume 36, Issue 6 - Jun 2012
Volume 36, Issue 5 - May 2012
Volume 36, Issue 4 - Apr 2012
Volume 36, Issue 3 - Mar 2012
Volume 36, Issue 2 - Feb 2012
Volume 36, Issue 1 - Jan 2012
Selecting the target year
Design and Control of a Biomimetic Fish Robot
Kim, Young-Jin ; Kim, Seung-Jae ; Yang, Kyung-Sun ; Lee, Jeong-Min ; Yim, Chung-Hyuk ; Kim, Dong-Hwan ;
Transactions of the Korean Society of Mechanical Engineers A, volume 36, issue 1, 2012, Pages 1~7
DOI : 10.3795/KSME-A.2012.36.1.001
This paper introduces the mechanical design, fabrication, and control of a biomimetic fish robot whose driving motions resemble a real fish`s flexibility and movement. This robot uses two motors create flexible movement like that of a fish. Several schemes, such as neutral buoyancy, fast underwater swimming, and direction changes, are introduced. The tail of the fish robot is made of a polymer material for flexible movement. The interior of the tail contains a joint and a wire. A sine wave command was applied to the tail to produce motion resembling a real fish swimming, and a buoy control device was installed. The up and down motion of the robot fish was controlled using this device.
Optical Analysis for Designing a Planar Solar Concentrator Based on Light Guide System
Han, Jong-Ho ; Kim, Jong-Sun ; Hwang, Chul-Jin ; Yoon, Kyung-Hwan ; Kang, Jeong-Jin ;
Transactions of the Korean Society of Mechanical Engineers A, volume 36, issue 1, 2012, Pages 9~16
DOI : 10.3795/KSME-A.2012.36.1.009
Recently, an optics-based concentrator for solar concentration has been a key issue in development of photovoltaic systems. In the present study, a new, simple, easily producible planar concentrator based on a light guide system is proposed. In this device, solar light is concentrated by microprism optical patterns guiding the light, mainly through total reflection and refraction. The main design variables of the concentrator are the geometric concentration ratio (
) and the
of the microprism pattern. Ray tracing was simulated using commercial software, SPEOS, and the optical efficiencies of the light guide solar concentrator were predicted in each case. The predicted maximum optical efficiencies are 65.60%, 54.78%, and 46.78%, respectively, for
values of 4, 5, and 6. The variation of the optical efficiencies according to
, and the incline angle of the incident light were predicted.
A Dual Triangular Pyramidal Indentation Technique Based on FEA Solutions for Material Property Evaluation
Kim, Min-Soo ; Hyun, Hong-Chul ; Lee, Jin-Haeng ; Lee, Hyung-Yil ;
Transactions of the Korean Society of Mechanical Engineers A, volume 36, issue 1, 2012, Pages 17~28
DOI : 10.3795/KSME-A.2012.36.1.017
In this study, we suggest a method for material property evaluation by dual-triangular pyramidal indenters using the reverse analysis. First, we demonstrated that load-displacement curves of conical and triangular pyramidal indenters are different for the same material. For this reason, an independent research on the triangular pyramidal indenter is needed. From FE indentation analyses on various materials, we then investigated the relationships among material properties, indentation parameters and load-displacement curves. From this, we established property evaluation formula using dual-triangular pyramidal indenters having two different half-included-angles. The approach provides the values of elastic modulus, yield strength and strain-hardening exponent within an average error of 3% for various materials.
Effect of the Radius of Curvature on the Contact Pressure Applied to the Endplate of the Sliding Core in an Artificial Intervertebral Disc
Kim, Cheol-Woong ;
Transactions of the Korean Society of Mechanical Engineers A, volume 36, issue 1, 2012, Pages 29~35
DOI : 10.3795/KSME-A.2012.36.1.029
The treatments for spinal canal stenosis are radicular cyst removal, spine fusion, and implantation of an artificial intervertebral disc. Artificial intervertebral discs have been most widely used since the mid-2000s. The study of artificial intervertebral discs has been focused on the analysis of the axial rotation, lateral bending, the degrees of freedom of the disc, and flexion-extension of the vertebral body. The issue of fatigue failure years after the surgery has arisen as a new problem. Hence, study of artificial intervertebral discs must be focused on the fatigue failure properties and increased durability of the sliding core. A finite element model based on an in the artificial intervertebral disc (SB Charit
III) was produced, and the influence of the radius of curvature and the change in the coefficient of friction of the sliding core on the von-Mises stress and contact pressure was evaluated. Based on the results, new artificial intervertebral disc models (Models-I, -II, and -III) were proposed, and the fatigue failure behavior of the sliding core after a certain period of time was compared with the results for SB Charit
Solder Bump Deposition Using a Laser Beam
Choi, Won-Suk ; Kim, Jea-Woon ; Kim, Jong-Hyeong ; Kim, Joo-Han ;
Transactions of the Korean Society of Mechanical Engineers A, volume 36, issue 1, 2012, Pages 37~42
DOI : 10.3795/KSME-A.2012.36.1.037
LIFT (laser-induced forward transfer) is an advanced laser processing method used for selectively transferring micron-sized objects. In our study, this process was applied in order to deposit solder balls in microsystem packaging processes for electronics. Locally melted solder paste could be transferred to a rigid substrate using laser pulses. A thin glass plate with a solder cream layer was used as a donor film, and an IR laser pulse (wavelength
Effect of Laser Shock Peening Simulation Parameters on Residual Stress of Inconel Alloy 600 Steel
Kim, Ju-Hee ; Kim, Yun-Jae ; Kim, Joung-Soo ;
Transactions of the Korean Society of Mechanical Engineers A, volume 36, issue 1, 2012, Pages 43~50
DOI : 10.3795/KSME-A.2012.36.1.043
The effects of parameters related to the finite element simulation of the laser shock peening(LSP) process on the residual stresses of Inconel alloy 600 steel are discussed. In particular, we focus on the maximum pressure, pressure pulse duration, laser spot size, and number of shots. It is found that certain ranges of the maximum pressure and pulse duration can produce the maximum compressive residual stresses near the surface, and thus proper choices of these parameters are important. The residual stresses are not affected by the laser spot size, provided it is larger than a certain size. The magnitudes of the compressive residual stresses and the plastically affected depths are found to increase with an increasing number of shots, but this effect is less pronounced for more shots.
Buckling Analysis of Composite Cylindrical Shell Using Numerical Analysis Method
Jung, Hae-Young ; Cho, Jong-Rae ; Bae, Won-Byung ; Lee, Woo-Hyung ;
Transactions of the Korean Society of Mechanical Engineers A, volume 36, issue 1, 2012, Pages 51~58
DOI : 10.3795/KSME-A.2012.36.1.051
The objective of this paper is to predict the buckling pressure of a composite cylindrical shell using buckling formulas (ASME 2007, NASA SP 8007) and finite element analysis. The model in this study uses a stacking angle of [0/90]12t and USN 125 composite material. All specimens were made using a prepreg method. First, finite element analysis was conducted, and the results were verified through comparison with the hydrostatic pressure buckling experiment results. Second, the values obtained from the buckling formula and the buckling pressure values obtained from the finite element analysis were compared as the stacking angle was changed in
. The linear and nonlinear results of the finite element analysis were consistent with the results of the experiment, with a safety factor of 0.85-1. Based on the above result, the ASME 2007 formula, a simplified version of the NASA SP-8007 formula, is regarded as a buckling formula that provides a reliable safety factor.
Volume Integral Equation Method for Problems Involving Multiple Diamond-Shaped Inclusions in an Infinite Solid under Uniaxial Tension
Lee, Jung-Ki ;
Transactions of the Korean Society of Mechanical Engineers A, volume 36, issue 1, 2012, Pages 59~71
DOI : 10.3795/KSME-A.2012.36.1.059
A volume integral equation method (VIEM) is introduced for the solution of elastostatic problems in unbounded isotropic elastic solids containing multiple interacting isotropic or anisotropic diamond-shaped inclusions subject to remote uniaxial tension. The method is applied to two-dimensional problems involving long parallel diamond-shaped cylindrical inclusions. A detailed analysis of the stress field at the interface between the matrix and the central inclusion is carried out for square and hexagonal packing of the inclusions. The effects of the number of isotropic or anisotropic diamond-shaped inclusions and of the various fiber volume fractions for the circular inclusions circumscribing its respective diamond-shaped inclusion on the stress field at the interface between the matrix and the central inclusion are also investigated in detail. The accuracy and efficiency of the method are examined through comparison with results obtained using the finite element method.
Development of a Safe Manipulator for Positioning a Kiosk Panel
Kim, Tae-Keun ; Kim, Byeong-Sang ; Song, Jae-Bok ; Kim, Hyo-Joong ; Park, Chang-Woo ; Kwon, Yong-Kwan ;
Transactions of the Korean Society of Mechanical Engineers A, volume 36, issue 1, 2012, Pages 73~79
DOI : 10.3795/KSME-A.2012.36.1.073
Kiosks are widely used in drive-thru systems in parking lots or on the highway to provide various services to drivers. However, the driver must stop at an exact location to access the kiosk, since its panel is fixed. In order to improve the kiosk accessibility, in this study we developed a manipulator that can adjust the position of the kiosk panel. The number of active joints was minimized to lower the cost, whereas a parallelogram mechanism and passive joints were adopted to increase its convenience for the users. Furthermore, a safety mechanism using springs and a cam was designed to ensure the safety of the user in the case of an emergency. The performance of the position controller and the safety mechanism were verified through various tests. In addition, the proposed collision reaction strategy improved the safety performance of the kiosk system.
Transient Creep Analysis in Indentation Tests
Lee, Jin-Haeng ; Lee, Hyung-Yil ;
Transactions of the Korean Society of Mechanical Engineers A, volume 36, issue 1, 2012, Pages 81~90
DOI : 10.3795/KSME-A.2012.36.1.081
The indentation test, which is one of the testing methods for evaluating the mechanical properties of materials, can be applied to the evaluation of creep properties. Many studies related to the indentation creep test, however, have just focused on the characteristics of the steady-state creep, so there are wide discrepancies between the uniaxial test and the indentation test. To obtain accurate creep properties, it is therefore important to consider the effects of transient creep. In the present work, the Ogbonna et al.`s work on the spherical indentation test including the transient creep was expanded and applied to the conical indentation creep test. The characteristics of the transient creep were analyzed via finite element simulations and compared with those obtained through spherical indentation. Other effects, such as elastic strain, indenter shape, contact area, and representative strain, which have not been considered properly in prior studies on the creep test, are also discussed.
Fatigue Analysis for Locking Device in Landing Gear Retract Actuator
Lee, Jeong-Sun ; Kang, Shin-Hyun ; Jang, Woo-Chul ; Lee, Seung-Gyu ; Oh, Seong-Hwan ;
Transactions of the Korean Society of Mechanical Engineers A, volume 36, issue 1, 2012, Pages 91~96
DOI : 10.3795/KSME-A.2012.36.1.091
The retract actuator makes the landing gear retract or extend during take-off and landing of an aircraft. To prevent folding of landing gear that has remained in the extended state because of an unexpected external disturbance, an internal locking device is applied to the retract actuator. The locking device is restrained with another internal component by oil pressure supplied to the retract actuator, and this restraint makes the locking of the actuator possible. Because locking and unlocking are repeated during retraction and extension of the landing gear, the locking device takes repeated identical loads, and the possibility of fatigue failure exists. In this study, the process and results of fatigue analysis for the locking device are presented, and the appropriateness of the analysis result is verified using a fatigue test.
Sensitivity Analysis for Using Gas Turbine Generator to Provide Alternate Alternating Current in APR+
Moon, Ho-Rim ; Park, Bhum-Lak ; Park, Young-Sheop ;
Transactions of the Korean Society of Mechanical Engineers A, volume 36, issue 1, 2012, Pages 97~102
DOI : 10.3795/KSME-A.2012.36.1.097
Alternate alternating current (AAC) is used in nuclear power plants (NPPs) in order to cope with station black outs (SBOs). AAC has been provided using diesel engine drive types in Korea`s NPPs. The structure of gas turbine generators (GTGs) is simpler than that of diesel generators (DGs), and GTGs have the advantage of longer maintenance intervals. However, GTG-AAC was not used in NPPs in Korea because of the lack of operation/maintenance experience. The purpose of this paper is to analyze the safety of APR+ considering a diversity of AAC types. This paper analyzes reliability data, mechanical specifications of DGs and GTGs, and the sensitivity of core damage frequency to the ACC type.
Optimal Design of Passive Gravity Compensation System for Articulated Robots
Park, Jin-Gyun ; Lee, Jae-Young ; Kim, Sang-Hyun ; Kim, Sung-Rak ;
Transactions of the Korean Society of Mechanical Engineers A, volume 36, issue 1, 2012, Pages 103~108
DOI : 10.3795/KSME-A.2012.36.1.103
In this paper, the optimal design of a spring-type gravity compensation system for an articulated robot is presented. Sequential quadratic programming (SQP) is adopted to resolve various nonlinear constraints in spring design such as stress, buckling, and fatigue constraints, and to reduce computation time. In addition, continuous relaxation method is used to explain the integer-valued design variables. The simulation results show that the gravity compensation system designed by proposed method improves the performance effectively without additional weight gain in the main workspace.
Performance Optimization of Down-the-Hole Hammer Using Taguchi Method
Shin, Dae-Young ; Song, Chang-Heon ;
Transactions of the Korean Society of Mechanical Engineers A, volume 36, issue 1, 2012, Pages 109~116
DOI : 10.3795/KSME-A.2012.36.1.109
There are a number of studies concentrating on drilling equipment and drilling methods, but none investigates the impact performance and optimization of DTH (down-the-hole) drilling. It is very difficult to experimentally evaluate the performance of a DTH hammer, because putting together an experimental setup for DTH drilling requires a great deal of money and time. Therefore, this paper examines the characteristics and performance of DTH hammers through pneumatic simulation after a thorough investigation of their working mechanism. In addition, the parameters linked to the performance of DTH hammers were selected using the design-of-experiment method, and then the optimization of performance factors, which are the impact rate and impact energy, was investigated using Taguchi method.
Stress Analysis of the Blade Joint for a Small Wind Turbine
Kim, Deok-Su ; Jung, Won-Young ; Jung, Jin-Tai ;
Transactions of the Korean Society of Mechanical Engineers A, volume 36, issue 1, 2012, Pages 117~124
DOI : 10.3795/KSME-A.2012.36.1.117
In this paper, an analysis of the joint that transmits power from the blades to the generator is performed using the FEM (finite element method). The mode shapes and natural frequencies were extracted using experimental modal analysis in order to establish the FEM model. Then, the model was verified by comparing the mode shapes and natural frequencies to those obtained from the ANSYS modal analysis. Dynamic stress analysis was performed at the rated and limited wind speeds considering the wind load and gravity.