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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 21, Issue 12 - Dec 1997
Volume 21, Issue 11 - Nov 1997
Volume 21, Issue 10 - Oct 1997
Volume 21, Issue 9 - Sep 1997
Volume 21, Issue 8 - Aug 1997
Volume 21, Issue 7 - Jul 1997
Volume 21, Issue 6 - Jun 1997
Volume 21, Issue 4 - Apr 1997
Volume 21, Issue 5 - Jan 1997
Volume 21, Issue 3 - Jan 1997
Volume 21, Issue 2 - Jan 1997
Volume 21, Issue 1 - Jan 1997
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On-line Tool Deflection Compensation System for Precision End-milling
Yang, Min-Yang ; Choe, Jong-Geun ;
Transactions of the Korean Society of Mechanical Engineers A, volume 21, issue 2, 1997, Pages 189~198
DOI : 10.22634/KSME-A.1922.214.171.124
This paper presents development of a practical tool deflection compensation system in order to reduce the machining error from the tool deflection compensation system in order to reduce the machining error from the tool deflection in the end-milling process. The devised system is a tool adapter which includes 1-axes force sensor for detecting tool deflection and 2-axes tool tilting device for adjusting tool position through computer interface on line process. Experimental in investigations for typical shaped workpieces representing various end milling situations are performed to verify the ability of the system to suppress the surface errors due to tool deflections. With the system, it is possible to get precise machining surface without any excessive machining error due to increased cutting force in more productive machining conditions.
Low Cycle Fatigue Life Evaluation of External Grooved C-shaped Specimen
Lee, Song-In ;
Transactions of the Korean Society of Mechanical Engineers A, volume 21, issue 2, 1997, Pages 199~208
DOI : 10.22634/KSME-A.19126.96.36.199
A local strain approach was applied to an external single and double grooved C-shaped specimen in order to evaluate and predict the fatigue crack initiation life by using low cycle fatigue properties. The low cycle fatigue properties were determined from the strain-controlled fatigue tests using smooth cylindrical axial specimens. Fatigue crack initiation life was evaluated by a life prediction software, FALIPS, based on the local strain approach. The fatigue life was significantly influenced by the mean stress, and SWT parameter represented the fatigue life effectively. The predicted fatigue crack initiation life was then compared to the experimental fatigue life evaluated from the C-shaped fatigue test specimens. A good correlation was found between the experimental and predicted fatigue lives within factors of 2 and 4 for the single and double grooved C-shaped specimens respectively. Also, experimental fatigue life of the double grooved specimen was 10-12 times longer than that of the single grooved specimen.
A feature data model in milling process planning
Lee, Choong-Soo ; Rho, Hyung-Min ;
Transactions of the Korean Society of Mechanical Engineers A, volume 21, issue 2, 1997, Pages 209~216
DOI : 10.22634/KSME-A.19188.8.131.52
A feature is well known as a medium to integrate CAD, CAPP and CAM systems. For a part drawing including both simple geometry and compound geometry, a process plan such as the selection of process, machine tool, cutting tool etc. normally needs simple geometry data and non-geometry data of the feature as the input. However, a extended process plan such as the generation of process sequence, operation sequence, jig & fixture, NC program etc. necessarily needs the compound geometry data as well as the simple geometry data and non-geometry data. In this paper, we propose a feature data model according to the result of analyzing necessary data, including the compound geometry data, the simple geometry data and the non-geometry data. Also, an example of the feature data model in milling process planning is described.
A Simple Finite Element Method to Determination of Deformed Shape and Load-Displacement Curve of Elastomers
Jeon, Man-Su ; Mun, Ho-Geun ; Kim, Seong-Jin ;
Transactions of the Korean Society of Mechanical Engineers A, volume 21, issue 2, 1997, Pages 217~222
DOI : 10.22634/KSME-A.19184.108.40.206
A simple finite element approach to predicting deformed shape and load-deflection curve of elastomers is presented in this paper. The method is based on several simplifications in deformation pattern and material behavior. The conventional updated Lagrangian approach is employed together with material data obtained by a simple tension test. The presented approach is verified through comparison of predicted results with experimental ones and applied successfully to shape design of various elastomers for shock, vibration and noise control. The advantage of the presented approach lies in easiness, simplicity and accuracy enough for engineering application.
The Fuzzy Controller for Spark Ignition Engine Knock Control
Lee, Jae-Hyung ; Ham, Yun-Young ; Chang, Kwang-Soo ; Chun, Kwang-Min ;
Transactions of the Korean Society of Mechanical Engineers A, volume 21, issue 2, 1997, Pages 223~231
DOI : 10.22634/KSME-A.19220.127.116.11
A variety of approaches have been investigated for the application of spark-ignition engine knock control. The control method implemented, here as "Fuzzy Control", has the advantage of not requiring the knowledge of a mathematical model of the controlled object and is more robust and flexible than conventional approaches. Knock control in this study is performed using vibration signal which is measured with accelerometer attached to the cylinder block of a 1498cc four-cylinder spark-ignition engine. The experimental results obtained with this method are compared with those obtained with a knock interval controller and with those of a conventional controller. Those results illustrate better performance in torque than knock interval controller and conventional controller.ontroller.
in Elliptic Crack under General Ioading Conditions
An, Deuk-Man ;
Transactions of the Korean Society of Mechanical Engineers A, volume 21, issue 2, 1997, Pages 232~244
DOI : 10.22634/KSME-A.1918.104.22.168
In this paper weight function theory is extended to the determination of the stress intensity factors for the mode I in elliptic crack. For the calculation of the fundamental fields Poisson's theorem and Ferrers's method were employed. Fundamental fields are constructed by single layer potentials with surface density of crack harmonic fundamental polynimials. Crack harmonic fundamental polynimials up to order four were given explicitly. As an example of the application of the weight function theory the stress intensity factors along crack tips in nearly penny-shaped elliptic crack are calculated.
Dynamic Stability of a Cantilevered Vertical Column Subjected to a Subtangential Force and Having a Tip Mass
Park, Young-Pil ; Ryu, Bong-Jo ; Lee, Gyu-Seop ; Kim, In-Sung ;
Transactions of the Korean Society of Mechanical Engineers A, volume 21, issue 2, 1997, Pages 245~251
DOI : 10.22634/KSME-A.1922.214.171.124
The dynamic behavior of elastic columns under the action of the subtangential force is studied in this paper. The subtangential force is the combination of the tip mass dead load and pure follower thrust. In this study, the tip mass is assumed to be a rigid body rather than a point mass. The equations of motion are derived based on the extended Hamilton's principle and the finite element method. Then the equations of motion are trasformed into a dimensionless form, and several parameters are identified. It is found that the critical subtangential force can be changed subtangentially by considering the parameters related to tip mass. It is also shown that the nonconservativeness of the applied force has a significant effect on the type of instability. The influence of the self-weight of the column on the variation of the critical force is also investigated.
Friction Compensation for Impedance Control of Pneumatic Manipulator
Park, Jung-Gyu ;
Transactions of the Korean Society of Mechanical Engineers A, volume 21, issue 2, 1997, Pages 252~260
DOI : 10.22634/KSME-A.19126.96.36.199
In this paper, a friction compensation method using a disturbance observer is proposed for an impedance control of pneumatic manipulator. It is assumed that the generated torque by a pneumatic actuator can be estimated based on the pressure signals and the discharge volume. In order to improve the dynamic characteristics of the pneumatic actuator driven by meter out method, we construct the inner torque control system by feeding back the generated torque. In order to reduce the influence of disturbances comprising friction torque and parameter variations of plant, the impedance control system is constructed with a disturbance observer which estimates the disturbances based on the generated torque of pneumatic actuator, the angular velocity and the reaction torque. From some experiments, it is confirmed that the proposed control system is effective to improve the robustness for the friction torque in the impedance control of a pneumatic manipulator.
Design and Evaluation of the Tension Sensor for Surgical Steel Wires
Joo, Jin-W ; Lee, Bong-S ;
Transactions of the Korean Society of Mechanical Engineers A, volume 21, issue 2, 1997, Pages 261~271
DOI : 10.22634/KSME-A.19188.8.131.521
This paper presents the design process and characteristic test results of tension sensors for measuring the ultimate tension forces of surgical wires. Three types of sensor were designed and tested for calibration. The first two types which transfer the wire tension to the sensing element by direct contact have too much hysterisis errors due to the firctional effect. This error can be considerably reduced in the modified structure, where a cover and a loading button is used to transfer force and moment to the sensing element. The strains predicted by theoretical equations agree well with those by finite element calculations neglecting friction and the strains by finite element analysis considering friction are in good agreement with those measured by four strain gages. The modified ring type tension sensor developed in this paper is expected to be useful for measuring the tension of surgical wires with nonlinearity of 1.31%FS, hysterisis of 5.74%FS and repeatability of 0.19%FS.
Vibration Analysis and Experimental Study for Rotating Sturctures
Park, Jung-Hun ; Yoo, Hong-Hee ;
Transactions of the Korean Society of Mechanical Engineers A, volume 21, issue 2, 1997, Pages 272~280
DOI : 10.22634/KSME-A.19184.108.40.2062
Comparative study on the analysis and experiment for the vibration of a rotating cantilever structure was made in this paper. Analysis results were obtained by using the modeling method which was developed in the previous work. The cross-section thickness variation due to the sensor attachment was additionally considered. In order to verify the accuracy of the analysis results, exerimental results were obtained. The analysis and experimental results were found to be in a good agreement. It was also shown that the aerodynamic and cross-section thickness variation effects significantly influenced the dynamic characteristics of the rotating structure.
Performance improvement of active noise control using on-line estimation of secondary path transfer function
Kim, Heung-Seob ; Sohn, Dong-Gu ; Oh, Jae-Eung ;
Transactions of the Korean Society of Mechanical Engineers A, volume 21, issue 2, 1997, Pages 281~287
DOI : 10.22634/KSME-A.19220.127.116.111
In the conventional inverse modeling method for on-line modeling of the secondary path transfer function, the signal to noise ratio between the arbitrary random signal and the plant noise have to keep at -10 - -20 dB. For these reasons, the modeling can't be exactly implemented by the conventional method alone and the convergence time for modeling becomes too long. In this study, by combining the conventional inverse modeling method with an adaptive line enhancer, or with an adaptive noise canceller, a rigorous transfer functions of secondary path modeling and the control of a primary noise have been implemented simultaneously.
The Effect of the Mass Matrix in the Eigenvalue Analysis of Curved Beam Elements
Yu, Ha-Sang ;
Transactions of the Korean Society of Mechanical Engineers A, volume 21, issue 2, 1997, Pages 288~296
DOI : 10.22634/KSME-A.1918.104.22.1688
Curved beam elements with two nodes based on shallow beam geometry and strain interpolations are employed in eigenvalue analysis. In these elements, the displacement interpolation functions and mass matrices are consistent with strain fields. To assess the quality of the element mass matrix in free vibration problems, several numerical experiments are performed. In these analysis, both the inconsistent mass matrices using linear displacement interpolation function and the consistent mass matrices are used to show the difference. The numerical results demonstrate that the accuracy is closely related to the property of the mass matrix as well as that of the stiffness matrix and that the mass matrix consistent with strain fields is very beneficial to eigenvalue analysis. Also, it is proved that the strain based elements are very efficient in a wide range of element aspect ratios and curvature properties.
Position and swing angle control for loads of overhead cranes
Lee, Ho-Hoon ; Cho, Sung-Kun ;
Transactions of the Korean Society of Mechanical Engineers A, volume 21, issue 2, 1997, Pages 297~304
DOI : 10.22634/KSME-A.1922.214.171.1247
This paper presents a systematic design method of an anti-swing control law for overhead cranes. A velocity servo system for the trolley of a crane is designed based on the dynamics of the trolley and its load. The velocity servo system compensates for the effects of load swing on the trolley dynamics so that the velocity servo is independent of load swing. The velocity servo system is used for the design of a position servo system for the trolley via the loop shaping method. The position servo system and the swing dynamics of the load are then used to design an angle control system for load swing based on the root locus method. The combined position servo and the angle control systems constitute the overall control system. In the presence of low frequency disturbances, the proposed control law guarantees accurate position control for the trolley and fast damping for load swing. Furthermore, the performance of the proposed control law is independent of the mass of the load. Experimental results on a prototype crane show the effectiveness of the proposed anti-swing control law.
Fatigue Crack Retardation by Concurrent Cold-Expansion and Ring-indentation
Yu, Jin-Sang ;
Transactions of the Korean Society of Mechanical Engineers A, volume 21, issue 2, 1997, Pages 305~316
DOI : 10.22634/KSME-A.19126.96.36.1995
A more efficient method for obtaining the fatigue life enhancement of a structure member with fastener holes is described. It is based on the combined process of cold-expansion and ring-indentation. Residual stresses were induced onto premachined holes using ring-indentation process near the fastener hole combined with cold-expansion. And residual stresses at the vicinity of a hole were evaluated using a fracture mechanics approach. The compressive residual stresses were larger using the combined process than is in the case of simple cold-expansion. Fatigue testing of aluminum specimens showed that the fatigue crack growth retardation emanating from a circular hole was greater for the combined process than for a simple cold-expansion alone.
Matrix Cracking and Delmaination in Laminated Composite Plates Due to Impact
Kim, Moon-Saeng ; Park, Seung-Bum ;
Transactions of the Korean Society of Mechanical Engineers A, volume 21, issue 2, 1997, Pages 317~326
DOI : 10.22634/KSME-A.19188.8.131.527
An investigation was performed to study the matrix cracking and delamination in laminated composite plates due to transverse impact. A model was developed for predicting the initiation of the matrix cracking and the shape and size of impact-induced delamination in laminated composite plates resulting from the ballistic impact. The model consists of a stress analysis and a failure analysis. A transient finite element analysis which was based on the higher-order shear deformation theory was adopted for calculating the stresses inside the laminated composite plates during impact. A failure analysis was used to predict the initial intraply matrix cracking and the shape and size of the interface delamination in the laminates. As a results, a shear matrix cracking which was governed by the transverse interlaminar shear stress occured at the middle layer near the midplane of laminates and a bending matrix cracking which was governed by the transverse inplane stress occured at the bottom layer near the surface of laminates. In a thick laminates, a shear matrix cracking generated first at the middle layer of laminates, but in a thin laminates, a bending matrix cracking generated first at the bottom layer of laminates.
Mechanical Error Analysis and Tolerance Design of A Four-Bar Path Generator With Lubricated Joints
Choi, Jin-Ho ; Lee, S.J ; Choi, Dong-Hoon ;
Transactions of the Korean Society of Mechanical Engineers A, volume 21, issue 2, 1997, Pages 327~336
DOI : 10.22634/KSME-A.19184.108.40.2067
This paper addresses an analytical approach to the mechanical error analysis and tolerance design of a four-bar path generator with lubricated joints. The mobility method is applied to consider lubrication effects and the four-bar path generator is stochastically modeled by using the clearance vector model for methanical error analysis. To show the validity of the proposed method, the mechanical errors obtained by applying the method to a four-bar path generator are compared with those by Monte Carlo simulation. Based on this analytical method, an optimal tolerance design problem is formulated and solved for the four-bar path generator.
Steady-state Vibration Responses of a Beam with a Nonlinear Boundary Condition
Lee, Won-Kyoung ; Yeo, Myeong-Hwan ;
Transactions of the Korean Society of Mechanical Engineers A, volume 21, issue 2, 1997, Pages 337~345
DOI : 10.22634/KSME-A.19220.127.116.117
An analysis is presented for the response of a beam constrained by a nonlinear spring to a harmonic excitation. The system is governed by a linear partial differential equation with a nonlinear boundary condition. The method of multiple scales is used to reduce the nonlinear boundary value problem to a system of autonomous ordinary differential equations of the amplitudes and phases. The case of the third-order subharmonic resonance is considered in this study. The autonomous system is used to determine the steady-state responses and their stability.
A Study on the High Temperature Deformation Behavior of a Solid Solution Aluminium Alloy
Kim, Ho-Gyeong ;
Transactions of the Korean Society of Mechanical Engineers A, volume 21, issue 2, 1997, Pages 346~351
DOI : 10.22634/KSME-A.1918.104.22.1686
The creep characteristics of an Al-5wt.% Ag alloy including the stress exponent, the activation energy for creep and the shape of the creep curve were investigated at a normalized shear stress extending from
and in the temperature range of 640-873 K, where silver is in solid solution. The experimental results shows that the stress exponent is 4.6, the activation energy is 141 kJ/mole, and the stacking fault energy is
, suggesting that the creep behavior of Al-5 wt.% Ag is similiar to that reported for pure aluminum, and that under the current experimental conditions, the alloy behaves as a class II(metal class). The above creep characteristics obtained for Al-5 wt.% Ag are discussed in the light of prediction regarding deformation mechanisms in solid solution alloys.
Inverse Dynamic Analysis of Flexible Multibody System in the Joint Coordinate Space
Lee, Byung-Hoon ;
Transactions of the Korean Society of Mechanical Engineers A, volume 21, issue 2, 1997, Pages 352~360
DOI : 10.22634/KSME-A.1922.214.171.1242
An inverse dynamic procedure for spatial multibody systems containing flexible bodies is developed in the relative joint coordinate space. Constraint acceleration equations are derived in terms of relative coordinates using the velocity transformation technique. An inverse velocity transformation operator, which transforms the Cartesian velocities to the relative velocities, is derived systematically corresponding to the types of kinematic joints connecting the bodies and the system reference matrix. Using the resulting matrix, the joint reaction forces and moments are analyzed in the Cartesian coordinate space. The formulation is illustrated by means of two numerical examples.