16 Result(s)
within
Dae ** Cho
Engineering
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Article
Experimental investigation of plasma arc cutting process to evaluate the characteristics of kerf geometry using ANOVA
The effects of cutting speed and current on plasma cut quality were investigated. Regression modeling was used to establish relationship between process parameters and responses. Analysis of variance was perfo...
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Article
Stability of the front wall and the horizontal behavior of composite reinforced-earth retaining walls
The aim of this study was to introduces a composite reinforced-earth retaining wall (CRERW) with eco-friendly front walls resembling natural slopes, as an aesthetic alternative to concrete walls. By addressing...
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Article
Influence of thermal flow and predicting phase transformation on various welding positions
This study performed computational fluid dynamics (CFD) simulation to investigate the flow patterns of molten pool during welding with a transient heat transfer. The influence of gravity changed the flow patte...
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Article
A study on vibration reduction by heat deformation of casting frame motor
High vibration in the horizontal motor causes damage in the shaft and bearing and it leads to a reduction in the lifetime and performance of the motor. A proper bearing preload and frame design can reduce some...
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Article
Sensorless Direct Torque Control for Interior Permanent-Magnet Synchronous Motors Using Square-Wave-Type Stator Flux Injection at Low-Speed Regions
This paper proposes sensorless direct torque control for interior permanent-magnet synchronous motors using square-wave-type stator flux injection at low-speed regions. In direct torque control based on the cu...
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Article
Rotor position estimation over entire speed range of interior permanent magnet synchronous motors
This paper presents a method for transitioning between sensorless rotor position estimation methods for an interior permanent magnet synchronous motor (IPMSM). Through the proposed method, rotor position estim...
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Article
Method of estimating initial rotor position for IPMSMs using subdivided voltage vectors based on inductance variation
This paper proposes a method for estimating the initial rotor position for an interior permanent-magnet synchronous motor (IPMSM) using subdivided voltage vectors based on inductance variation. Since the stato...
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Article
A numerical study on an infinite linear elastic Bernoulli-Euler beam on a viscoelastic foundation subjected to harmonic line loads
This paper presents a numerical study on the low-amplitude responses of an infinite Bernoulli-Euler beam resting on a viscoelastic foundation subjected to harmonic line loads. To simulate the linear response, ...
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Article
Effect of process parameters on root pass welding and analysis of microstructure in V-groove pulsed gas metal arc welding for mild steel
This study performed root pass welding with a V-groove using a pulsed gas metal arc welding process for mild steel. Welding process parameters such as weaving, root gap size, and travel speed were major factor...
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Article
Evaluation of aerodynamic performance enhancement of Risø_B1 airfoil with an optimized cavity by PIV measurement
Airfoils are mostly inefficient in their off-design conditions. In order to improve the aerodynamic performance of airfoils in these conditions, using an optimized cavity on airfoils as a passive method can be...
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Article
Algorithms of mathematical models for fast multi-pass weld-bead drawing technique in V-groove welding
This study proposes an algorithm by using bead sequences and drawing techniques for multi-pass V-groove welding. Several points were prepared to form the weld bead shape. Then, a spline method called piecewise...
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Article
Role of additive concentration in slow-speed sliding contact under boundary lubrication conditions
The adsorption model for boundary lubrication was proposed considering the variations of additive content with sliding distance. With surface roughness and wear debris caused by the adhesive wear of the oxide ...
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Chapter and Conference Paper
Information Reminder System Based on Word Registered by User
According to the Hermann Ebbinghaus’s forgetting curve, the memory of people starts forgetting after 10 min more than 50 % after one hour. The reason that people typically record words on note is for remindin...
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Article
A study on the quality of two-wire tandem submerged arc welds under iso-heat input conditions
The influence of the leading and trailing arc welding current on two-wire tandem submerged (SAW-T) arc weld quality was studied at a iso-heat input of 2.5 kJ/mm. The weld quality includes weld bead dimensions,...
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Article
Hydro-thermo-mechanical analysis on high cycle thermal fatigue induced by thermal stri** in a T-junction
Turbulent mixing in a T-junction causes thermal stri** which is irregular and frequent fluctuation of thermal layer. Thermal stri** is a significant thermal problem because it causes unpredicted high cycle...
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Article
Design of elastomeric bearing system and analysis of it mechanical properties
This paper proposes a new type of bearing system. In this study, a method for design of on elastomeric bearing system and its mechanical property analysis are carried. Experimental and theoretical studies of t...
