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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 33, Issue 12 - Dec 2009
Volume 33, Issue 11 - Nov 2009
Volume 33, Issue 10 - Oct 2009
Volume 33, Issue 9 - Sep 2009
Volume 33, Issue 8 - Aug 2009
Volume 33, Issue 7 - Jul 2009
Volume 33, Issue 6 - Jun 2009
Volume 33, Issue 5 - May 2009
Volume 33, Issue 4 - Apr 2009
Volume 33, Issue 3 - Mar 2009
Volume 33, Issue 2 - Feb 2009
Volume 33, Issue 1 - Jan 2009
Selecting the target year
Development of Lifetime Evaluation and Management Technologies for Nuclear Power Plants
Jin, Tae-Eun ;
Transactions of the Korean Society of Mechanical Engineers A, volume 33, issue 10, 2009, Pages 991~1004
DOI : 10.3795/KSME-A.2009.33.10.991
Operating experience of the various components in the nuclear power plants has shown that a variety of degradation mechanisms can occur during operation. Therefore, the accurate lifetime evaluation and systematic management are very important for the safe as well as the economical operation of the nuclear power plants. In this paper, the characteristics of a total of 17 degradation mechanisms were reviewed and the plausible degradation mechanisms such as stress corrosion cracking, fatigue, irradiation embrittlement, and so on, were identified. Also, the lifetime evaluation technologies which have been developed for the application to the domestic nuclear power plants are described. In addition, a total of 48 aging management programs which have been established for the safe operation of the various components are explained.
A Decentralized Brake System for Railway Rolling Stocks Using the Adaptive Sliding Mode Control Scheme
Park, Sung-Hwan ; Lee, Ji-Min ; Kim, Jong-Shik ;
Transactions of the Korean Society of Mechanical Engineers A, volume 33, issue 10, 2009, Pages 1005~1013
DOI : 10.3795/KSME-A.2009.33.10.1005
In this paper, the performance improvement of a decentralized brake system for railway rolling stocks is investigated. In order to verify the effectiveness of the decentralized brake system, it is compared to the truck unit brake system which has only one control unit per a truck. The adaptive sliding mode control scheme is used to realize a robust anti-slip brake control system. Through computer simulations, it is verified that the decentralized brake system has better braking performance than the truck unit brake system.
Redundancy Trajectory Generation for Biped Robot Manipulators
Yeon, Je-Sung ; Park, Jong-Hyeon ;
Transactions of the Korean Society of Mechanical Engineers A, volume 33, issue 10, 2009, Pages 1014~1022
DOI : 10.3795/KSME-A.2009.33.10.1014
A biped robot in locomotion can be regarded to be kinetically redundant in that the link-chain from its foot on the ground to its swing foot has more degrees of freedom that needed to realize stable bipedal locomotion. This paper proposes a new method to generate a trajectory for bipedal locomotion based on this redundancy, which directly generates a locomotion trajectory at the joint level unlike some other methods such as LIPM (linear inverted-pendulum mode) and GCIPM (gravity-compensated inverted-pendulum mode), each of which generates a trajectory of the center of gravity or the hip link under the assumption of the dominance of the hip-link inertia before generating the trajectory of the whole links at the joint level. For the stability of the trajectory generated in the proposed method, a stability condition based on the ZMP (zero-moment point) is used as a constraint as well as other kinetic constraints for bipedal motions. A 6-DOF biped robot is used to show how a stable locomotion trajectory can be generated in the sagittal plane by the proposed method and to demonstrate the feasibility of the proposed method.
Effect of Chemical Mechanical Cleaning(CMC) on Particle Removal in Post-Cu CMP Cleaning
Kim, Young-Min ; Cho, Han-Chul ; Jeong, Hae-Do ;
Transactions of the Korean Society of Mechanical Engineers A, volume 33, issue 10, 2009, Pages 1023~1028
DOI : 10.3795/KSME-A.2009.33.10.1023
Cleaning is required following CMP (chemical mechanical planarization) to remove particles. The minimization of particle residue is required with each successive technology generation, and the cleaning of wafers becomes more complicated. In copper damascene process for interconnection structure, it utilizes 2-step CMP consists of Cu and barrier CMP. Such a 2-steps CMP process leaves a lot of abrasive particles on the wafer surface, cleaning is required to remove abrasive particles. In this study, the chemical mechanical cleaning(CMC) is performed various conditions as a cleaning process. The CMC process combined mechanical cleaning by friction between a wafer and a pad and chemical cleaning by CMC solution consists of tetramethyl ammonium hydroxide (TMAH) / benzotriazole (BTA). This paper studies the removal of abrasive on the Cu wafer and the cleaning efficiency of CMC process.
A Study on Optimization of Motion Parameters and Dynamic Analysis for 3-D.O.F Fish Robot
Kim, Hyoung-Seok ; Quan, Vo Tuong ; Lee, Byung-Ryong ; Yu, Ho-Yeong ;
Transactions of the Korean Society of Mechanical Engineers A, volume 33, issue 10, 2009, Pages 1029~1037
DOI : 10.3795/KSME-A.2009.33.10.1029
Recently, the technologies of mobile robots have been growing rapidly in the fields such as cleaning robot, explosive ordnance disposal robot, patrol robot, etc. However, the researches about the autonomous underwater robots have not been done so much, and they still remain at the low level of technology. This paper describes a model of 3-joint (4 links) fish robot type. Then we calculate the dynamic motion equation of this fish robot and use Singular Value Decomposition (SVD) method to reduce the divergence of fish robot's motion when it operates in the underwater environment. And also, we analysis response characteristic of fish robot according to the parameters of input torque function and compare characteristic of fish robot with 3 joint and fish robot with 2 joint. Next, fish robot's maximum velocity is optimized by using the combination of Hill Climbing Algorithm (HCA) and Genetic Algorithm (GA). HCA is used to generate the good initial population for GA and then use GA is used to find the optimal parameters set that give maximum propulsion power in order to make fish robot swim at the fastest velocity.
Dynamic Analysis of a 3-Phase BLDC Motor Considering Variation of an Air-Gap
Park, Ki-Sun ; Im, Hyung-Bin ; Chung, Jin-Tai ;
Transactions of the Korean Society of Mechanical Engineers A, volume 33, issue 10, 2009, Pages 1038~1044
DOI : 10.3795/KSME-A.2009.33.10.1038
In this study, vibrations of an electric motor are analyzed when the motor has the interaction between mechanical and electromagnetic behaviors. For this vibration analysis a 3-phase 8-pole brushless DC motor is selected. Vibrations of the motor are influenced by coupled electromechanical characteristics. The variation of air-gap induced by vibration has an influence on the inductance of the motor coil. To analyze dynamic characteristics of the rotor, we studied inductance by the variation of an air-gap. After obtaining the kinetic, potential and magnetic energies for the motor, the equations of motion are derived by using Lagrange's equation. By applying the Newmark time integration method to the equations, the dynamic responses for the displacements and currents are computed.
Precision Position Controller Design for a 6-DOF Stage with Piezoelectric Actuators and Lever Linkages Based on Nonlinearity Estimation
Moon, Jun-Hee ; Lee, Bong-Gu ;
Transactions of the Korean Society of Mechanical Engineers A, volume 33, issue 10, 2009, Pages 1045~1053
DOI : 10.3795/KSME-A.2009.33.10.1045
Precision stages for 6-DOF positioning, actuated by PZT stacks, which are fed back by gap sensors and guided by flexure hinges, have enlarged their application territory in micro/nano manufacturing and measurement area. The precision stages inherently have such limitations as the nonlinearity between input and output in piezoelectric stacks, feedback signal noise in precision capacitive gap sensors and low material damping in precision kinematic linkages of mechanical flexures. To surmount these limitations, the precision stage is modeled with physics-based variables, which are identified by transient response correspondence, and a gain margin calculation algorithm using the Prandtl-Ishlinskii model and describing function is newly developed to assess system performance more precisely than linear controller design schemes. Based on such analyses, a precision positioning controller is designed. Excellent positioning accuracy with rapid settlement accomplished by the controller is shown in step responses of the closed-loop system.
Acquirement of True Stress-strain Curve Using True Fracture Strain Obtained by Tensile Test and FE Analysis
Lee, Kyoung-Yoon ; Kim, Tae-Hyung ; Lee, Hyung-Yil ;
Transactions of the Korean Society of Mechanical Engineers A, volume 33, issue 10, 2009, Pages 1054~1064
DOI : 10.3795/KSME-A.2009.33.10.1054
In this work, we predict a true fracture strain using load-displacement curves from tensile test and finite element analysis (FEA), and suggest a method for acquiring true stress-strain (SS) curves by predicted fracture strain. We first derived the true SS curve up to necking point from load-displacement curve. As the beginning, the posterior necking part of true SS curve is linearly extrapolated with the slope at necking point. The whole SS curve is then adopted for FE simulation of tensile test. The Bridgman factor or suitable plate correction factors are applied to pre and post FEA. In the load-true strain curve from FEA, the true fracture strain is determined as the matching point to test fracture load. The determined true strain is validated by comparing with test fracture strain. Finally, we complete the true SS curve by combining the prior necking part and linear part, the latter of which connects necking and predicted fracture points.
Estimation of C(t)-Integral in Transient Creep Condition for Pipe with Crack Under Combined Mechanical and Thermal Stress (II) - Elastic-Plastic-Creep -
Song, Tae-Kwang ; Kim, Yun-Jae ;
Transactions of the Korean Society of Mechanical Engineers A, volume 33, issue 10, 2009, Pages 1065~1073
DOI : 10.3795/KSME-A.2009.33.10.1065
In this paper, the estimation method of C(t)-integral for combined mechanical and thermal loads is proposed for elastic-plastic-creep material via 3-dimensional FE analyses. Plasticity induced by initial loading makes relaxation rate different from those produced elastically. Moreover, the interactions between mechanical and thermal loads make the relaxation rate different from those produced under mechanical load alone. To quantify C(t)-integral for combined mechanical and thermal loads, the simplified formula are developed by modifying redistribution time in existing work done by Ainsworth et al..
The Prediction of Brake Corner Module Squeal Noise Using Participation Factor Analysis
Lee, Jong-Ghi ; Lim, Hyun-Seok ; Kim, Hee-Yong ; Baek, Jae-Wook ;
Transactions of the Korean Society of Mechanical Engineers A, volume 33, issue 10, 2009, Pages 1074~1080
DOI : 10.3795/KSME-A.2009.33.10.1074
A method for determining the geometric stability characteristics of a brake corner module (BCM) is presented. Since disc brake "squeal" noise typically occurs at unstable resonant frequencies of a system, the likelihood of disc brake squeal for a particular design can be determined. Finite element methods are used to derive complex eigenvalue for a brake corner module. Some unstable modes calculated by finite element methods correspond to squeal noise data. Through kinetic energy participation analysis for each part of BCM, we can efficiently predict squeal noise data.
Dynamic Characteristics of an Antagonistic Actuation with Pneumatic Artificial Muscles
Kang, Bong-Soo ; Song, Seung ;
Transactions of the Korean Society of Mechanical Engineers A, volume 33, issue 10, 2009, Pages 1081~1086
DOI : 10.3795/KSME-A.2009.33.10.1081
This paper presents dynamic characteristics of pneumatic artificial muscles. Since the actuating performance of a pneumatic muscle is closely related to the input pressure of a pneumatic muscle, the air flow model on a valve orifice and an elastic bladder of the muscle is formulated to estimate precisely the pressure variance of pneumatic muscles during deflating and inflating process. Frequency response experiments are performed with an antagonistic system consisting of two pneumatic muscles and fast pneumatic control valves. Comparing with experimental results, the proposed model yielded good performance in estimating dynamic motions of the antagonistic system as well as the pressure variance of the pneumatic artificial muscles
Development of Ultrafine-Grained Aluminum Tubes Using Severe Plastic Deformation Process
Kim, Kyung-Jin ; Yoon, Jeong-Whan ; Yang, Dong-Yol ;
Transactions of the Korean Society of Mechanical Engineers A, volume 33, issue 10, 2009, Pages 1087~1090
DOI : 10.3795/KSME-A.2009.33.10.1087
A unique process was developed to improve the mechanical properties of a circular tube. In this proposed process, a large amount of strain is applied to the wall of tube, leading to grain refinement in the material. In order to investigate characteristics of microstructural evolution such as the distribution of grain size and misorientation angle during the process, an EBSD OIM analysis was carried out. The analysis confirms that the proposed process can very effectively produce a circular tube with ultrafine-grains.
Evaluation of Fatigue Crack Initiation Life in a Press-Fitted Shaft Considering the Fretting Wear
Lee, Dong-Hyong ; Kwon, Seok-Jin ; You, Won-Hee ; Choi, Jae-Boong ; Kim, Young-Jin ;
Transactions of the Korean Society of Mechanical Engineers A, volume 33, issue 10, 2009, Pages 1091~1098
DOI : 10.3795/KSME-A.2009.33.10.1091
In this paper, the procedure to estimate fatigue crack initiation life has been established by considering fretting wear and multiaxial stress states on the contact surface of press-fitted shafts. And a method to calculate the local friction coefficient during the running-in period of fretting wear process has been proposed. The predicted result of worn surface profile in the press-fitted shaft with non-linear local friction coefficient can avoid excessive wear depth estimation compared with that for the case of constant local friction coefficient. Furthermore, the predicted fatigue crack initiation lives based on Smith-Watson-Topper model considering the fretting wear are in good agreement with the experimental data. Consequently, the present method is valid not only for predicting worn surface profile, but also for assessing fatigue crack initiation lives considering the fretting wear during the running-in period in press fits.
Stability Evaluation of the Railway Bogie According to the Tread Inclination of Wheel Profile Using Scale Model
Hur, Hyun-Moo ; You, Won-Hee ; Kim, Nam-Po ; Park, Tae-Won ;
Transactions of the Korean Society of Mechanical Engineers A, volume 33, issue 10, 2009, Pages 1099~1107
DOI : 10.3795/KSME-A.2009.33.10.1099
Numerical simulation and experimental study to evaluate the critical speed of the railway bogie according to the tread inclination of wheel profile were conducted using 1/5 scale model. It has been shown that the results of the critical speed analysis for the scale bogie model is very close to the test results using scale bogie model and the critical speed is decreased in proportion to the increase of equivalent conicity of wheel profile. Results of this study show that the scale model could be applied to research area relating to vehicle stability as an alternative to overcome the experimental problems caused by full scale test on the roller rig.
Investigation of FIV Characteristics on a Coaxial Double-tube Structure
Song, Kee-Nam ; Kim, Yong-Wan ; Park, Sang-Chul ;
Transactions of the Korean Society of Mechanical Engineers A, volume 33, issue 10, 2009, Pages 1108~1118
DOI : 10.3795/KSME-A.2009.33.10.1108
A Very High Temperature Gas Cooled Reactor (VHTR) has been selected as a high energy heat source of the order of
for nuclear hydrogen generation, which can produce hydrogen from water or natural gas. A primary hot gas duct (HGD) as a coaxial double-tube type cross vessel is a key component connecting a reactor pressure vessel and an intermediate heat exchanger in the VHTR. In this study, a structural sizing methodology for the primary HGD of the VHTR is suggested in order to modulate a flow-induced vibration (FIV). And as an example, a structural sizing of the horizontal HGD with a coaxial double-tube structure was carried out using the suggested method. These activities include a decision of the geometric dimensions, a selection of the material, and an evaluation of the strength of the coaxial double-tube type cross vessel components. Also in order to compare the FIV characteristics of the proposed design cases, a fluid-structure interaction (FSI) analysis was carried out using the ADINA code.
New Considerations on Variability of Creep Rupture Data and Life Prediction
Jung, Won-Taek ; Kong, Yu-Sik ; Kim, Seon-Jin ;
Transactions of the Korean Society of Mechanical Engineers A, volume 33, issue 10, 2009, Pages 1119~1124
DOI : 10.3795/KSME-A.2009.33.10.1119
This paper deals with the variability analysis of short term creep rupture test data based on the previous creep rupture tests and the possibility of the creep life prediction. From creep tests performed by constant uniaxial stresses at 600, 650 and
elevated temperature, in order to investigate the variability of short-term creep rupture data, the creep curves were analyzed for normalized creep strain divided by initial strain. There are some variability in the creep rupture data. And, the difference between general creep curves and normalized creep curves were obtained. The effects of the creep rupture time (RT) and steady state creep rate (SSCR) on the Weibull distribution parameters were investigated. There were good relation between normal Weibull parameters and normalized Weibull parameters. Finally, the predicted creep life were compared with the Monkman-Grant model.
Experimental Investigation of Friction and Wear Characteristics of O-Ring
Oh, Jun-Chul ; Kim, Dae-Eun ; Kim, Hyun-Jun ; Kim, Mun-Hwan ; Kim, Chun-Il ;
Transactions of the Korean Society of Mechanical Engineers A, volume 33, issue 10, 2009, Pages 1125~1131
DOI : 10.3795/KSME-A.2009.33.10.1125
O-rings are commonly used in machines as a seal. Due to prolonged use the surface of an O-ring can degrade which can lead to leakage as well as contamination. Damage of O-rings used in vacuum applications such as sputter is caused by various mechanisms. Particles detached from the O-ring may cause significant problems on the performance of the system in the vacuum chamber. Therefore, understanding the tribological behavior of O-rings is important to tackle the damage caused by repeated contact. In this work, FKM rubber was used for friction and wear tests conducted to investigate the tribological behavior of O-rings. A reciprocating type of a tribo-tester was used for the tests. The friction coefficient between the steel ball and the FKM specimen was quite high. Also, in order to identify the wear behavior, the surface of the FKM specimen was characterized using both optical and scanning electron microscopes. Evidence of wear due to adhesion and extrusion could be found. The results of this work will aid in improving the durability of O-rings.
Six Sigma Robust Design for Railway Vehicle Suspension
Lee, Kwang-Ki ; Park, Chan-Kyoung ; Han, Seung-Ho ;
Transactions of the Korean Society of Mechanical Engineers A, volume 33, issue 10, 2009, Pages 1132~1138
DOI : 10.3795/KSME-A.2009.33.10.1132
The spring constants of primary suspensions for a railway vehicle are optimized by a robust design process, in which the response surface models(RSMs) of their dynamic responses are constructed via the design of experiment(DOE). The robust design process requires an intensive computation to evaluate exactly a probabilistic feasibility for the robustness of dynamic responses with their probabilistic variances for the railway vehicle. In order to overcome the computational process, the process capability index
is introduced which enables not only to show the mean value and the scattering of the product quality to a certain extent, but also to normalize the objective functions irrespective of various different dimensions. This robust design, consequently, becomes to optimize the
subjected to constraints, i.e. 2, satisfying six sigma. The proposed method shows not only an improvement of some
violating the constraints obtained by the conventional optimization, but also a significant decrease of the variance of the
A Study on Validation of Accelerated Model for Pneumatic Cylinder
Kang, Bo-Sik ; Kim, Hyoung-Eui ; Chang, Mu-Seong ; Song, Chang-Seop ;
Transactions of the Korean Society of Mechanical Engineers A, volume 33, issue 10, 2009, Pages 1139~1143
DOI : 10.3795/KSME-A.2009.33.10.1139
Pneumatic cylinder is widely used as key component of various industry fields just like automation production line. Recently, people begin to pay attention to reduce development period and cost of pneumatic cylinder so research requirements of accelerated life test of pneumatic cylinder have been increased more than ever. In this research, we shall evaluate availability of acceleration model by statistical analysis of acceleration model's predicted value and life data which acquired in a real operation condition after finish accelerated life test of pneumatic cylinder. Also to predict the life of pneumatic cylinder in the operation condition we shall develop new acceleration model equations.
A Feasibility Study on Bayesian Inference of Parameters of Weibull Distributions of Failures for Two Non-identical Components in Series System by using Discrete Time Approximation Method
Chung, In-Seung ;
Transactions of the Korean Society of Mechanical Engineers A, volume 33, issue 10, 2009, Pages 1144~1150
DOI : 10.3795/KSME-A.2009.33.10.1144
This paper investigates the feasibility of the Bayesian discrete time approximation method to estimate the parameters of Weibull distributions of failures for two non-identical components connected in series system. A Bayesian model based on the discrete time approximation method is formulated to infer the Weibull parameters of two non-identical components with the failure data of the virtual tests. The study of this paper comes to a conclusion that the method is feasible only for some special cases under the given constraints on the concerned parameters.
A Study on Application of Fatigue Correction Factor for Environmental Fatigue Evaluation of Pressurizer Surge Line
Yang, Jun-Seog ; Park, Chi-Yong ; Kang, Seon-Ye ;
Transactions of the Korean Society of Mechanical Engineers A, volume 33, issue 10, 2009, Pages 1151~1157
DOI : 10.3795/KSME-A.2009.33.10.1151
Nuclear power plants applying for the continued operation over design life are required to address the effects of reactor water environment in fatigue design requirement of the ASME Code. Reactor water environmental effects are generally evaluated by calculating fatigue correction factors on fatigue usage. This paper describes the application for pressurizer surge line of environmental fatigue correction factors and the strain rate impact in the application. From this paper, the environmental fatigue correction factors resulted from the assumption of a step change in temperature are especially compared with those calculated from the data measured during plant startup. As a conclusion of this paper, the design transient conditions applied to the fatigue design may be conservative in case of the environmental fatigue evaluation.
Fatigue Limit of Copper Film
Huh, Yong-Hak ; Kim, Dong-Jin ; Lee, Hae-Moo ; Hong, Sung-Gu ; Park, Jun-Hyub ;
Transactions of the Korean Society of Mechanical Engineers A, volume 33, issue 10, 2009, Pages 1158~1162
DOI : 10.3795/KSME-A.2009.33.10.1158
Fatigue limit of the copper film coated by Sn was estimated using Goodman diagram and Gerber diagram. To obtain the high cycle fatigue life curve, S-N curve, of the film, the high cycle fatigue test was carried out by applying the constant amplitude load to the film specimen with three different stress ratio of 0.05, 0.3 and 0.5 and the frequency of 40 Hz at room temperature in air. The free-standing film specimen 15.26
thick was fabricated by etching process. The fatigue limits and S-N curves at the respective stress ratios were determined from the experimental works. It was shown that the S-N curves were dependent on the stress ratio and the fatigue limit was increased with decreasing the stress ratio. The dependency of the fatigue behavior was presented in empirical relationship. Using these relationships, the fatigue limit was predicted.
Reliability Analysis Under Input Variable and Metamodel Uncertainty Using Simulation Method Based on Bayesian Approach
An, Da-Wn ; Won, Jun-Ho ; Kim, Eun-Jeong ; Choi, Joo-Ho ;
Transactions of the Korean Society of Mechanical Engineers A, volume 33, issue 10, 2009, Pages 1163~1170
DOI : 10.3795/KSME-A.2009.33.10.1163
Reliability analysis is of great importance in the advanced product design, which is to evaluate reliability due to the associated uncertainties. There are three types of uncertainties: the first is the aleatory uncertainty which is related with inherent physical randomness that is completely described by a suitable probability model. The second is the epistemic uncertainty, which results from the lack of knowledge due to the insufficient data. These two uncertainties are encountered in the input variables such as dimensional tolerances, material properties and loading conditions. The third is the metamodel uncertainty which arises from the approximation of the response function. In this study, an integrated method for the reliability analysis is proposed that can address all these uncertainties in a single Bayesian framework. Markov Chain Monte Carlo (MCMC) method is employed to facilitate the simulation of the posterior distribution. Mathematical and engineering examples are used to demonstrate the proposed method.
Development and Application of the Methodology to Establish Life Extension and Modernization Plan of Aged Hydropower Plants
Kim, Jong-Sung ; Kwon, Hyuck-Cheon ; Song, Byung-Hun ; Kwon, Chang-Seop ;
Transactions of the Korean Society of Mechanical Engineers A, volume 33, issue 10, 2009, Pages 1171~1176
DOI : 10.3795/KSME-A.2009.33.10.1171
This paper provides how to establish an integrated plan for LE (life extension) and MD (modernization) of aged hydropower plants. The methodology is developed through review of overseas/domestic LE/MD histories, investigation of the previous overseas methodologies and consideration of domestic practices. The methodology includes reviews of the various factors such as condition, operation and maintenance history, up-to-date technology, and economic benefit. In order to establish the life extension/modernization plan, the methodology is applied to the domestic aged hydropower plants. Finally, priority rankings and draft practice plans for LE/MD are derived.
Technology of Inspection and Real-time Displacement Monitoring on Critical Pipe for Power Plant
Hyun, Jung-Seob ; Heo, Jae-Sil ; Cho, Sun-Young ; Heo, Jeong-Yeol ; Lee, Seong-Kee ;
Transactions of the Korean Society of Mechanical Engineers A, volume 33, issue 10, 2009, Pages 1177~1186
DOI : 10.3795/KSME-A.2009.33.10.1177
High temperature steam pipes of thermal power plant are subject to a severe thermal range and usually operates well into the creep range. Cyclic operation of the plant subjects the piping system to mechanical and thermal fatigue damages. Also, poor or malfunctional supports can impose massive loads or stress onto the piping system. In order to prevent the serious damage and failure of the critical piping system, various inspection methods such as visual inspection, computational analysis and on-line piping displacement monitoring were developed. 3-dimensional piping displacement monitoring system was developed with using the aluminum alloy rod and rotary encoder sensors, this system was installed and operated on the high temperature steam piping of "Y" thermal power plant successfully. It is expected that this study will contribute to the safety of piping system, which could minimize stress and extend the actual life of critical piping.