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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 28, Issue 12 - Dec 2004
Volume 28, Issue 11 - Nov 2004
Volume 28, Issue 10 - Oct 2004
Volume 28, Issue 9 - Sep 2004
Volume 28, Issue 8 - Aug 2004
Volume 28, Issue 7 - Jul 2004
Volume 28, Issue 6 - Jun 2004
Volume 28, Issue 5 - May 2004
Volume 28, Issue 4 - Apr 2004
Volume 28, Issue 3 - Mar 2004
Volume 28, Issue 2 - Feb 2004
Volume 28, Issue 1 - Jan 2004
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The Study of Continuous System Combined with Distributed DVA (II)
Choi, Jeung-Hyun ; Lim, Byoung-Duk ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 3, 2004, Pages 215~221
DOI : 10.3795/KSME-A.2004.28.3.215
Large machine and structure can not be normally treated as lumped parameter system. Such machine or structure must be broken down to individual beams or panels the motion of which must be analysed before an absorber system can be designed for each element. The absorber may be a lumped parameter system or a continuous system. One of the most common elements in a machine or structure is the cantilever, and in this paper is considered the design of a continuous parameter absorber to reduce the transverse vibrations of a beam. So this paper describes the method to obtain the accurate information about combined continuous beam system with DVA. This information is obtained from the combined system`s receptance. and this paper shows the convenience and useful informations when design the dynamic vibration absorber with the combined system`s receptance.
Speed Sensorless Torque Monitoring During Machining on CNC Lathe
Hong, Ik-Jun ; Kwon, Won-Tae ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 3, 2004, Pages 222~229
DOI : 10.3795/KSME-A.2004.28.3.222
In this paper, the torque of CNC spindle motor during machining is estimated without speed measuring sensor. The CNC spindle system is divided into two parts, the induction spindle motor part and mechanical part. In mechanical part, the variation of the frictional force due to the increment of the cutting torque and the effect of damping coefficient is investigated. Damping coefficient is found to be a function of spindle speed and not influenced by the weight of the load, while frictional force is a function of both the cutting torque and spindle speed. Experimental equations are drawn for damping coefficient and Coulomb friction as a function of spindle speed. Incremental frictional torque Is also obtained as a function of both cutting torque and spindle speed. Graphical programming is used to implement the suggested algorithm to monitor the torque of an induction motor in real time. Torque of the spindle induction motor is estimated well in about average 3% error range under various cutting conditions.
A Study on Lane Sensing System Using Stereo Vision Sensors
Huh, Kun-Soo ; Park, Jae-Sik ; Rhee, Kwang-Woon ; Park, Jae-Hak ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 3, 2004, Pages 230~237
DOI : 10.3795/KSME-A.2004.28.3.230
Lane Sensing techniques based on vision sensors are regarded promising because they require little infrastructure on the highway except clear lane markers. However, they require more intelligent processing algorithms in vehicles to generate the previewed roadway from the vision images. In this paper, a lane sensing algorithm using vision sensors is developed to improve the sensing robustness. The parallel stereo-camera is utilized to regenerate the 3-dimensional road geometry. The lane geometry models are derived such that their parameters represent the road curvature, lateral offset and heading angle, respectively. The parameters of the lane geometry models are estimated by the Kalman filter and utilized to reconstruct the lane geometry in the global coordinate. The inverse perspective mapping from the image plane to the global coordinate considers roll and pitch motions of a vehicle so that the mapping error is minimized during acceleration, braking or steering. The proposed sensing system has been built and implemented on a 1/10-scale model car.
Parameters Estimation and Torque Monitoring for the Induction Spindle Motor
Kwon, Won-Tae ; Kim, Gyu-Sik ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 3, 2004, Pages 238~244
DOI : 10.3795/KSME-A.2004.28.3.238
To monitor the torque of an induction motor using current, the accurate identification of the motor parameters is very important. In this study, the motor parameters such as rotor resistance, stator and rotor leakage inductance, mutual inductance are estimated for torque monitoring and indirect vector control. Estimated parameters are used to monitor the torque of vector controlled induction motor without any speed measuring sensor. Stator current is measured to estimate the magnetizing current which is used to calculate flux linkage, rotor velocity and motor torque. From the experiments, the proposed method shows a good estimation of the motor parameters and torque under the normal rotational speed.
Optical Cap Sensor for Magneto-Optic Near-Field Recording
Yoon, Yong-Joong ; Park, Jae-Hyuk ; Park, No-Cheol ; Park, Young-Pil ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 3, 2004, Pages 245~250
DOI : 10.3795/KSME-A.2004.28.3.245
This paper proposes a new method of measuring an air interface distance between a solid immersion lens(SIL) applied magneto-optic technology and the disk surface. For applying near-field recording (NFR) technology to the magneto-optic storage devices for the next generation, it is positively necessary to maintain the small air gap under about 100㎚. We design an apparatus that consists of some optical components such as a prism, a polarizer and an analyzer. By using the Fresnel reflection coefficient equation, Jones matrices calculation and Malus`s law, we establish a mathematical model for understanding the characteristics of the system. The simulations are based on the mathematical model and through the simulation results which is made with various cases we can estimate the performance of the new optical gap sensor system. Experimental results, which are also based on the mathematical model for specific cases, are in good agreement with simulated ones and demonstrate the possibility as the new optical gap sensor.
Eigenvalue Analysis of a Membrane Using the Multiscale Adaptive Wavelet-Galerkin Method
Yi, Yong-Sub ; Kim, Yoon-Young ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 3, 2004, Pages 251~258
DOI : 10.3795/KSME-A.2004.28.3.251
Since the multiscale wavelet-based numerical methods allow effective adaptive analysis, they have become new analysis tools. However, the main applications of these methods have been mainly on elliptic problems, they are rarely used for eigenvalue analysis. The objective of this paper is to develop a new multiscale wavelet-based adaptive Galerkin method for eigenvalue analysis. To this end, we employ the hat interpolation wavelets as the basis functions of the finite-dimensional trial function space and formulate a multiresolution analysis approach using the multiscale wavelet-Galerkin method. It is then shown that this multiresolution formulation makes iterative eigensolvers very efficient. The intrinsic difference-checking nature of wavelets is shown to play a critical role in the adaptive analysis. The effectiveness of the present approach will be examined in terms of the total numbers of required nodes and CPU times.
Plastic η Eactors for J-Integral Testing of Double-Edge Cracked Tension(DE(T)) Plates
Son, Beom-Goo ; Shim, Do-Jun ; Kim, Yun-Jae ; Kim, Young-Jin ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 3, 2004, Pages 259~266
DOI : 10.3795/KSME-A.2004.28.3.259
Detailed two-dimensional and three-dimensional finite element (FE) analyses of double-edge cracked tension (DE(T)) specimens are carried out to investigate the effect of the relative crack length and the thickness on experimental J testing schemes. Finite element analyses involve systematic variations of relevant parameters, such as the relative crack depth and plate width-to-thickness ratio. Furthermore, the strain hardening index of material is systematically varied, including perfectly plastic (non-hardening) cases. Based on FE results, a robust experimental J estimation scheme is proposed.
Optimization Technique of Passenger Car Suspension System Considering J-Turn Handling Performances
Lee, Sang-Beom ; Lee, Chun-Seung ; Yim, Hong-Jae ; Kim, Min-Soo ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 3, 2004, Pages 267~273
DOI : 10.3795/KSME-A.2004.28.3.267
The purpose of this paper is to develop a systematic design method for the suspension system hard points and compliance elements, which have great influence on the handling stability of a vehicle. In this paper, a method to optimize J-turn responses is presented based on the principles of design of experiments, multi-body dynamic analysis and optimum design technique. The design variables associated with the J-turn maneuver are selected through the experimental design sensitivity analysis using the perturbation method. An objective function is defined as an approximate function for the J-turn characteristics using the TSA(Taylor series approximation). The values of the design variables, which make the optimized J-turn characteristics, are obtained using the conjugate gradient method. The result of the J-turn simulation shows that the optimized vehicle has more improved handling stability than the optimized vehicle.
Radial Vibration Analysis of Cylindrical Piezoelectric Transducers Considering Anisotrpy
Lee, Jung-Gu ; Kim, Jin-Oh ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 3, 2004, Pages 274~280
DOI : 10.3795/KSME-A.2004.28.3.274
This paper presents the analysis fur the radial vibration characteristics of cylindrical piezoelectric transducers. Taking into account the piezoelectric anisotropy, the differential equations of piezoelectric radial motion have been derived in terms of radial displacement and electric potential. Applying mechanical and electric boundary conditions has yielded a characteristic equation for radial vibration. Numerical analysis also has been carried out by using the finite element method. Theoretical calculations of the fundamental natural frequency have been compared with the experimental observations for transducers of several sizes. Comparison with the previous report of theoretical analysis simplifying the piezoelectric anisotropy into isotropy concludes that isotropic analysis is a reasonable process to predict the vibration characteristics of piezoelectric transducers.
The Effect of Fiber Stacking Angle on the Relationship Between Fatigue Crack and Delamination Behavior in a Hybrid Composite Materials
Song, Sam-Hong ; Kim, Cheol-Woong ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 3, 2004, Pages 281~288
DOI : 10.3795/KSME-A.2004.28.3.281
The hybrid composite material (Al/GFRP laminates) are applied to the fuselage and wing in a aircraft. Therefore, Al/GFRP laminates suffer from the cyclic bending moments. This study was to evaluate the effect of fiber stacking angle on the fatigue crack propagation and delamination behavior using the relationship between crack growth rate (da/dN) and stress intensity factor range (ΔK) in Al/GFRP laminates under cyclic bending moment. The variable delamination growth behavior in case of three different type of fiber orientations, i.e., [Al/O
/Al] and [Al/90
/Al] at the interface of Al layer and glass fiber layer was measured by ultrasonic C-scan images. As results of this study, It represent that the delamination shape should turns out to have more effective characteristics on the fiber stacking angle. The extension of the delamination zone in case of [Al/+45
/Al] and [Al/90
/Al] were not formed along the fatigue crack profile. The shape of delamination zone depend on fiber stacking angle and the variable type with the delamination contour decreased non-linearly toward the crack tip at the Al layer.
Application of FAD on Pressure Tube for the Probabilitic Integrity Assessment
Kwak, Sang-Log ; Wang, Jong-Bae ; Park, Youn-Won ; Lee, Joon-Seong ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 3, 2004, Pages 289~295
DOI : 10.3795/KSME-A.2004.28.3.289
Pressure tubes are major component of nuclear reactor, but only selected samples are periodically examined due to numerous numbers of tubes. Current in-service inspection result show there is high probability of flaw existence at uninspected pressure tube. Probabilistic analysis is applied in this study for the integrity assessment of uninspected pressure tube. All the current integrity evaluations procedures are based on conventional deterministic approaches. So it is expected that the results obtained are too conservative to perform a rational evaluation of lifetime. More realistic failure criteria, based on FAD are also proposed for the probabilistic analysis. As a result of this study failure probabilities for various conditions are calculated, and examined application of FAD and LBB concept.
A New Way to Manufacture Ultra Light Metal Structures
Kang, Ki-Ju ; Jeon, Gye-Po ; Nah, Seong-Jun ; Ju, Bo-Seong ; Hong, Nam-Ho ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 3, 2004, Pages 296~303
DOI : 10.3795/KSME-A.2004.28.3.296
Recently, the ultra light metal structure with periodic and three dimensional truss elements takes attention because of its multi-functionality and substantial heat resistance. However, the complicated fabrication process leading to high cost has been a major obstacle to wide applications. In this paper, a new idea to construct an ultra light structure with periodic, three dimensional truss using metal wires is presented. To prove the practical validity, a Kagome-like structure was fabricated from stamped wires and punched face sheets. It was assembled by soldering. Through three-point bending and compression tests, the strength was evaluated and compared with the theory.
Cracking Threshold Analysis for Nanoindetation Using 3D Finite-Element Method
Koo, Jae-Mean ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 3, 2004, Pages 304~310
DOI : 10.3795/KSME-A.2004.28.3.304
In this paper, cracking threshold for nanoindentation is analyzed by using 3D finited-element method. The analysis by maximum principal stress criterion can obtain the reliable results for determining to crack initiation location and load. Because the ratio of maximum principal stress to indentation depth for Victors indentation is smaller than flat-plane-column indentation and cracking for Victors indentation occurs from the inner part of specimen difficult to measure crack length, the nanoindentation facture test for flat-plane-column indentation is more effective.
New Engineering Methods for Non-Linear Deflection Estimation of Cylinder under Bending
Huh, Nam-Su ; Kim, Yun-Jae ; Kim, Young-Jin ; Jung, Hyun-Kyu ; Lee, Dong-Hoon ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 3, 2004, Pages 311~317
DOI : 10.3795/KSME-A.2004.28.3.311
This paper proposes engineering estimation equations for the maximum deflection of a cylinder subject to bending under elastic-plastic and elastic-creep conditions. Being based on the reference stress approach, the proposed equations are simple to use and can accommodate general tensile and creep behaviours. Validation against detailed 3-D FE results using actual stress-strain data and realistic creep-deformation data shows excellent agreement, which provides confidence in the use of the proposed equation. Based on the proposed equations, together with information on in-service inspection data, discussion is given how to estimate future time-dependent and time-independent deflection of the CANDU pressure tube. Thus the present result would be valuable information for integrity assessment of the CANDU pressure tube.
Stability Analysis of a Straight Pipe with Time Dependent Flow
Hong, Sung-Chul ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 3, 2004, Pages 318~324
DOI : 10.3795/KSME-A.2004.28.3.318
The stability of a simply supported straight pipe is investigated. The time dependent flow is assumed to vary harmonically about a constant mean velocity. Stability conditions and dynamic reponses of a governing equation are conducted by use of multiple scale mettled. Parametric resonances and combination resonances are investigated. Stability boundaries are analytically determined. The resulted stability conditions show that instabilities exist when the frequency of flow fluctuation is close to two times the natural frequency or to the sum of any two natural frequencies. In case that the fluctuated flow frequency is close to zero or to the difference of two natural frequencies, however, instabilities are not found up to the first order of perturbation. Stability charts are numerically Presented fir the first two vibration modes.