32 Result(s)
within
Sung** Lee
Engineering
Vibration, Dynamical Systems, Control
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Article
Flow distribution in manifolds for low Reynolds number flow
This paper addresses the fundamental flow distribution question of how to design manifolds of low Reynolds number flow with both numerical analysis and experiments. The present study introduces new parameters ...
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Article
Measurements of temperature fields within film-cooling jets injected from a row of compound angle holes
Thermal fields downstream of the film-cooling jets injected through compound angle holes in a row have been measured with variations of the orientation angle and the blowing ratio. Detailed temperature distrib...
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Article
A modeling of pump impeller shroud and wear-ring seal as a whole, and its application to the pump rotordynamics
A modeling methodology of pump impeller shroud and wear-ring seal as a whole has been developed to give its rotordynamic coefficients. In this work the governing equations are derived for the continuous flow p...
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Article
A rotordynamic analysis of circumferentially-grooved pump seals based on a three-control-volume theory
In this paper the leakage prediction and rotordynamic analysis of an annular seal with a smooth rotor and circumferentially grooved stator are performed based on a three-control-volume theory. The present anal...
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Article
An analytic study on laminar film condensation along the interior surface of a cave-shaped cavity of a flat plate heat pipe
An analytic approach has been employed to study condensate film thickness distribution inside cave-shaped cavity of a flat plate heat pipe. The results indicate that the condensate film thickness largely depen...
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Article
The control system modeling and experiment for the tele-operated unmanned vehicle
The control system design and modeling of an unmanned vehicle by means of a new concept for better performance through a tele-operation system is suggested by sensor fusion. But, the control of a real vehicle ...
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Article
DDM Rotordynamic design sensitivity analysis of an APU turbogenerator having a spline shaft connection
An eigenvalue design sensitivity formulation of a general nonsymmetric-matrix rotor-bearing system is devised, using the DDM (direct differential method). Then, investigations on the design sensitivities of cr...
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Article
Examination of cavitation-induced surface erosion pitting of a mechanical heart valve using a solenoid-actuated apparatus
Several factors, including peak dp/dt of the ventricular pressure and maximum closing velocity of leaflet have been studied as indices of the cavitation threshold. In the present study, just before closing vel...
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Article
Dynamic compressive creep of extruded ultra-high molecular weight polyethylene
To estimate the true wear rate of polyethylene acetabular cups used in total hip arthroplasty, the dynamic compressive creep deformation of ultra-high molecular weight polyethylene (UHMWPE) was quantified as a...
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Article
Damage tolerance in hardly coated layer structure with modest elastic modulus mismatch
A study is made on the characterization of damage tolerance by spherical indentation in hardly coated layer structure with modest elastic modulus mismatch. A hard silicon nitride is prepared for the coating ma...
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Article
Effect of elastic modulus mismatch on the contact crack initiation in hard ceramic coating layer
Effect of elastic modulus mismatch on the contact crack initiation is investigated to find major parameters in designing desirable surface-coated system. Silicon nitride coated soft materials with various elas...
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Article
Fracture analysis of electronic ic package in reflow soldering process
The purposes of the paper are to analyze the fracture phenomenon by delamination and cracking when the encapsulant of plastic IC package with polyimide coating shows viscoelastic behavior under hygrothermal lo...
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Article
LP compressor blade vibration characteristics at starting conditions of a 100 MW heavy-duty gas turbine
In this paper are presented the blade vibration characteristics at the starting conditions of the low pressure multistage axial compressor of heavy-duty 100 MW gas turbine. Vibration data have been collected t...
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Article
Application of Immersed Boundary Method for flow over stationary and oscillating cylinders
IBM (Immersed Boundary Method) with feedback momentum forcing was applied to stationary and moving bodies. The capability of IBM to treat the obstacle surfaces, especially with moving effect has been tested fo...
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Article
Indentation experiment and analysis on mold and resin material during the nanoimprint process
Analysis and experiment on mold and resin materials for the nanoimprint process are conducted in this study. We developed FEM analysis of indentation stress induced in mold materials when they come in contact ...
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Article
Heat transfer analysis during a curing process for UV nanoimprint lithography
A heat transfer analysis during the curing process in UV-Nanoimprint lithography was carried out. To imprint nano/micro patterns into a large-area target glass such as LCD panels, a mold with a poly-urethane-a...
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Article
The effect of change in width on stress distribution along the curved segments of stents
Curved structural members are widely seen in our surroundings, such as railway supports in playgrounds resembling a c-ring structure. The common geometry of the curved member consists of a segment of a circula...
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Article
Coupled linkage system optimization for minimum power consumption
This paper presents the dynamic analysis and kinematic parameter optimization of a coupled linkage system for the purpose of employing the system in construction industry. So far, the kinematic optimization of...
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Article
Material characterization of Inconel 718 from free bulging test at high temperature
Macroscopic superplastic behavior of metallic or non metallic materials is usually represented by the strain-rate sensitivity, and it can be determined by tensile tests in uniaxial stress state and bulging tes...
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Article
A study on the energy efficiency improvement of greenhouses — with a focus on the theoretical and experimental analyses
Most greenhouses in Korea are made according to European weather conditions, which leads to very low solar energy efficiency under the domestic weather conditions. Thus, greenhouses in Korea should be adapted ...
