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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korea Society For Power System Engineering
Journal Basic Information
Journal DOI :
The Korea Society for Power System Engineering
Editor in Chief :
Volume & Issues
Volume 15, Issue 6 - Dec 2011
Volume 15, Issue 5 - Oct 2011
Volume 15, Issue 4 - Aug 2011
Volume 15, Issue 3 - Jun 2011
Volume 15, Issue 2 - Apr 2011
Volume 15, Issue 1 - Feb 2011
Selecting the target year
Thermal stress analysis of the turbocharger housing using finite element method
Choi, B.L. ; Bang, I.W. ;
Journal of the Korea Society For Power System Engineering, volume 15, issue 6, 2011, Pages 5~10
DOI : 10.9726/kspse.2011.15.6.005
A turbocharger is subjected to rapid temperature changes during thermal cyclic loads. In order to predict the thermo-mechanical failures, it`s very important to estimate temperature distributions under the thermal shock test. This paper suggest the finite element techniques with the temperature histories, a constitutive material model and the mechanical constraints to calculate the thermal stresses and plastic strain distributions for the turbine housing. The first step was to develop a simple coupon approach to represent the failure mechanism of the classical design shapes and secondly applied the actual turbocharger to predict and validate the weak locations under the physical engine test.
A Study on the Power and Smoke Characteristics for the Intake System Improvement using Air Conditioning System in a Diesel Vehicle
Youn, Y.C. ; Kwon, K.R. ; Pyeon, H. ;
Journal of the Korea Society For Power System Engineering, volume 15, issue 6, 2011, Pages 11~15
DOI : 10.9726/kspse.2011.15.6.011
This study investigated the symptoms of the a reduction in output while driving on the road, or increasing of fumer out exhaust gas on inclined road while working air-conditioner in summer. Notice how the experiment in 2010, the Ministry of Environment(Chapter No. 2010-46), and how the vehicle emissions inspection was carried out. 2500cc Diesel cars used in the study were used and compare to output of engine, exhaust gas, inhalation temperature measurement Inhalation of cold air has not been supplied to all agencies when comparing the results when cold air intake temperature of the supply air-conditioning switch range control from 1 to 4, the temperature drops
. At the momentum of switch level 4, output from 63ps to 66ps after the connection has increased 9.6 percent, the highest concentration of exhaust emissions were reduced by 42.8%. This research can contribute in part to the reduction of exhaust directly supply into the cooling air intake line, doing the output of diesel cars in the summer. In addition, construction equipment and machinery that are currently being used excluding the engine`s intercooler cooling of the supply line via a separate output in the summer and help reduce exhaust emissions is expected.
An Experimental Study on the Smoke Filtration System of Suction Type of Exhaustic Gas using Vaccum
Lee, H.S. ; Ki, S.W. ; Koh, D.K. ;
Journal of the Korea Society For Power System Engineering, volume 15, issue 6, 2011, Pages 16~21
DOI : 10.9726/kspse.2011.15.6.016
Over the past years, many research works have been carried out to investigate the factors which govern the performance of diesel engine. The air pollutant emission from the diesel engine is still a significant environmental concern in many countries. In the present study, new system of smoke filtration of diesel engine is proposed. This new system is using vacuum equipment and filter for capture smoke. To verification new system experiments are performed at diesel vehicle and engine dynamometer. As a result it is founded that smoke is decreased of 67% at vehicle test and decrease of 45.2% at full load condition of engine dynamometer test.
Numerical Analysis of Flow Phenomena in Cylindrical Shell with Baffle according to the Position of Inlet and Outlet
Shin, Y.H. ; Sayeed, S.M. ; Jean, Y.C. ; Chung, H.S. ; Jeong, H.M. ;
Journal of the Korea Society For Power System Engineering, volume 15, issue 6, 2011, Pages 22~26
DOI : 10.9726/kspse.2011.15.6.022
A numerical simulation on the flow field was carried out on the cylindrical shell with baffles. The steady incompressible 3-D Navier-Stokes solution is obtained with the actual operational condition and geometry of the heat exchanger. The effect of the location of inlet and outlet on the cylindrical shell with baffle is investigated by varying flow rate. The angle between the location of In/Outlet and baffle cutting part is
. The present results show that the pressure drop is dependent on Reynolds number in the inlet area and position of inlet and outlet; i.e., the pressure drop increases with increasing Reynolds number and the pressure drop decreases with increasing angle between baffle cutting part and position of inlet and outlet.
A Study of Numerical Wave Tank for 3-Dimensional Free Surface Wave Simulation
Ha, Y.R. ; Kim, Y.J. ;
Journal of the Korea Society For Power System Engineering, volume 15, issue 6, 2011, Pages 27~34
DOI : 10.9726/kspse.2011.15.6.027
The increasing capabilities of the computers enable us to utilize various numerical schemes for the time-domain simulations concerned with 3-dimensional free-surface wave problems. There are still difficulties to solve such kind of problems, however. That`s because long time simulations with large computational domain are needed in time-domain analysis. So, we need faster and more efficient numerical schemes to get the solutions practically for these problems. In this paper, a high-order spectral/boundary-element method is used for the numerical investigation of physics involved in wave-body interaction. This method is one of the most efficient numerical methods by which the nonlinear gravity waves can be simulated and hydrodynamic forces also can be calculated in time-domain. To get the robust study in these topics, various numerical tests are performed and compared with others` works.
Numericla Study on the Aerodynamic Performances of the Turbo Blower Using Fluid-Structure Interaction Method
Park, T.G. ; Chung, H.T. ; Kim, H.B. ; Park, J.Y. ;
Journal of the Korea Society For Power System Engineering, volume 15, issue 6, 2011, Pages 35~40
DOI : 10.9726/kspse.2011.15.6.035
The present study aims at investigating the effect of the fluid-structure interaction on the aerodynamic performances in the turbo blower. The design specifications of the reference model driven by 400kW power were given as 7.43kg/s of mass flow rate, 1.66 of pressure ratio with 12000rpm of impeller rotating speed. Numerical simulation has been performed on the three cases based on the tip clearance between the impeller blade and the shroud. The CFX-turbo for flow fields and ANSYS-mechanical for structure domain were applied to solve the present FSI problems inside the turbo blower. Through the numerical results, the performances corrected by the FSI effects were proposed for the more reliable predictions.
Performance Analysis of the Refrigerant oil separator with a build-in heater
Kim, J.R. ;
Journal of the Korea Society For Power System Engineering, volume 15, issue 6, 2011, Pages 41~46
DOI : 10.9726/kspse.2011.15.6.041
Refrigerant oil reduces friction between piston and cylinder of compressor and is normally hard to mix or dissolve in refrigerant. Oil separator deprives refrigerating oil from mixed solution of refrigerant and refrigerant oil. Sometimes much machine oil is carried into an evaporator and is applied to surface of the evaporator, and then disturbs heat transfer through it. Well-made oil separator helps refrigerating system stable and evaporator sustain full capacity. In this paper, new oil separate with different way to structure is suggested and tested. As result the new separates is 13% higher at 0C with 10% mixture and 6% higher at 0C with 20% mixture.
Static Analysis of Continuous Fiber-Reinforced Laminated Beams Based on Hybrid-Mixed Formulation
Kim, J.G. ; Lee, J.K. ;
Journal of the Korea Society For Power System Engineering, volume 15, issue 6, 2011, Pages 47~52
DOI : 10.9726/kspse.2011.15.6.047
In this study, an accurate 2-noded hybrid-mixed element for continuous fiber-reinforced laminated beams is newly proposed. The present element including the effect of shear deformation is based on Hellinger-Reissner variational principle, and introduces additional consistent node less degrees for displacement field interpolation in order to enhance the numerical performance. The micromechanical and lamination theory are employed in the finite element description to consider the effects of the laminate stacking sequences, material orthotropy, and fiber volume fraction, etc. The element stiffness matrix can be explicitly derived through the stationary condition and static condensation using Mathematica program. Several numerical examples confirm the accuracy of the present hybrid-mixed element and also show in detail the effects of the continuous fiber volume fraction, stacking sequences and boundary condition on the bending behavior of laminated beams.
Optimization of Mold for Fineblanking Forming of Sector Gear for Recliner
Lee, K.Y. ; Nam, K.W. ; Moon, C.K. ;
Journal of the Korea Society For Power System Engineering, volume 15, issue 6, 2011, Pages 53~58
DOI : 10.9726/kspse.2011.15.6.053
To optimization of mlod for fineblanking forming of sector gear of recliner, it was analyzed the effect of clearance, V-ring height, V-ring position, blank holding force and counter punch force. In case of 0.003 mm of clearancs, the finest shear plane was obtained, but optimization between die and punch clearance was 0.005 mm. The height of V-ring was 0.7 mm. In case of increasing of hold force, the size of shear plane got better and the decrement of thickness became smaller. Both the size of shear plane and the decrement of thickness increased according to increasing of counter punch force.
Reliability evaluation of recliner by multi moulding Fineblanking
Lee, K.Y. ; Nam, K.W. ; Moon, C.K. ;
Journal of the Korea Society For Power System Engineering, volume 15, issue 6, 2011, Pages 59~66
DOI : 10.9726/kspse.2011.15.6.059
This study was carried out the experimental and the analysis for process of carburizing and quenching, evaluated the reliability of mock-up. Carburizing of comer of rock gear was higher than body regardless of condition of eight processes, and the end of gear tooth was more highly distributed than root. Hardness of surface shows the maximum value and was decreased linear to depth direction. The result of analysis wasn`t nearly the heat deformation. In mock-up, tooth flank increased 0.096%, thickness of tooth decreased 0.11% and body increased 0.11%. It had no trouble with assembly and operation like this. The mock-up of recliner for automobile was secured stability by four types of test.
Influence of SiC Content and Heat Treatments on Strength of Al2O3 Ceramics
Kim, G.U. ; Moon, C.K. ; Yoon, H.K. ; Kim, B.A. ;
Journal of the Korea Society For Power System Engineering, volume 15, issue 6, 2011, Pages 67~72
DOI : 10.9726/kspse.2011.15.6.067
In the present study, crack healing effect and residual stress of
ceramics were investigated by changing the sintering temperature and heat treatment conditions. And also it was investigated that the influence of different filler loadings of nano-sized SiC particles on the crack healing behavior of
ceramics. The test samples were characterized by three point bend flexural tests to evaluate their mechanical properties. The morphological changes were studied by FE-SEM and EDS. The test results indicated that the
with nano-sized SiC ceramics sintered at
were showed highest density. Sintering temperature at
, the bending strength of heat treatment in air atmosphere specimens showed about 42 % increment in comparison to the un-heat treated specimens. The cracked specimens can be healed by heat treatment in vacuum atmosphere but the crack healing effect of
ceramics, which is heat treated in air atmosphere was higher than that of heat treated in vacuum atmosphere.
with 30 wt% of SiC ceramics indicated higher crack healing ability than that with 15 wt% of SiC ceramics. The FE-SEM images showed that the median cracks and pores were disappeared after heat treatment in air.
Effect of PWHT on Variability of fatigue Crack Propagation Resitance in TIG Welded Al 6013-T4 Aluminum Alloy
Haryadi, Gunawan Dwi ; Lee, Sang-Yeul ; Kim, Seon-Jin ;
Journal of the Korea Society For Power System Engineering, volume 15, issue 6, 2011, Pages 73~80
DOI : 10.9726/kspse.2011.15.6.073
The experimental investigation focuses on an influence of artificial aging time in longitudinal butt welded Al 6013-T4 aluminum alloy on the fatigue crack growth resistance. The preferred welding processes for this alloy are frequently tungsten inert gas welding (TIG) process due to its comparatively easier applicability and better weldability than other gas metal arc welding. Fatigue crack growth tests were carried out on compact tension specimens (CT) in longitudinal butt TIG welded after T82 heat treatment was varied in three artificial aging times of 6 hours, 18 hours and 24 hours. Of the three artificial aging times, 24 hours of artificial aging time are offering better resistance against the growing fatigue cracks. The superior fatigue crack growth resistance preferred spatial variation of materials within each specimen in the Paris equation based on reliability theory and fatigue crack growth rate by crack length are found to be the reasons for superior fatigue resistance of 24 hours of artificial aging time was compared to other joints. The highest of crack propagation resistance occurs in artificial aging times of 24 hours due to the increase in grain size (fine grained microstructures).
A Study on the Wear and Lubricating Properties of Porous PTFE Composite
Kim, Y.S. ; Kim, H.Y. ; Ju, C.S. ;
Journal of the Korea Society For Power System Engineering, volume 15, issue 6, 2011, Pages 81~85
DOI : 10.9726/kspse.2011.15.6.081
Because of excellent mechanical properties, such as good friction coefficient and heat resistance characteristics, PTFE parts have been widely used in the industries. However, the poor wear resistance of PTFE has been a main problem limiting wider applications. In this study, to improve the poor wear resistance of PTFE, porous PTFE composites were prepared by mixing additives(sodium bicarbonate and graphite) with PTFE powder. The friction coefficient, wear resistance and lubricating property of porous PTFE composites were measured and the results were compared with those of untreated PTFE.
A Hydraulic Power Steering System Based on Electro Hydrostatic Actuator
Li, Z.M. ; Lee, J.M. ; Park, S.H. ; Kim, J.S. ; Park, Y.H. ;
Journal of the Korea Society For Power System Engineering, volume 15, issue 6, 2011, Pages 86~94
DOI : 10.9726/kspse.2011.15.6.086
In this paper, an electro hydraulic power steering system based on electro hydrostatic actuator (EHA) is proposed. A detailed steering model for the proposed electro hydraulic power steering system including mechanical and hydraulic subsystems is established. A conventional electro hydraulic power steering system is also modeled to evaluate the performance of the proposed power steering system such as responsiveness, assist force, command tracking and steering feel by computer simulation. From the computer simulation results, it is found that the proposed power steering system based on EHA has desirable performance.
Evaluation of Energy Transfer Efficiency of Pneumatic Driving Apparatus
Jang, J.S. ; Ji, S.W. ;
Journal of the Korea Society For Power System Engineering, volume 15, issue 6, 2011, Pages 95~100
DOI : 10.9726/kspse.2011.15.6.095
In this study, an evaluation equation of energy efficiency of pneumatic driving apparatus is proposed. The evaluation equation is derived from state equation and energy equation of air in a control volume, and, the equation of motion of a moving part of a pneumatic cylinder. As a result, distribution of consumption energy and energy efficiency of pneumatic driving apparatus can be analyzed quantitatively. The effectiveness of the proposed method is proved by a pneumatic cylinder driving apparatus using a meter-out driving method.