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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
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Journal DOI :
The Korea Society for Power System Engineering
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Volume & Issues
Volume 19, Issue 6 - Dec 2015
Volume 19, Issue 5 - Oct 2015
Volume 19, Issue 4 - Aug 2015
Volume 19, Issue 3 - Jun 2015
Volume 19, Issue 2 - Apr 2015
Volume 19, Issue 1 - Feb 2015
Selecting the target year
An Application Method and Review of Lightning Protection for Wind Turbines
Han, Ji-Hoon ; Ko, Kyung-Nam ; Huh, Jong-Chul ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 2, 2015, Pages 5~14
DOI : 10.9726/kspse.2015.19.2.005
This investigation presents reviews of many research results on lightning damage to wind turbines and lightning protection strategies from IEC Standard, Europe, USA, Japan and Korea. There have been few studies on lightning protection of wind turbines in Korea, while various investigations have been performed in the other countries. It is necessary to apply some good lightning protection strategies of IEC Standard and the other countries to Korea. Those are as follows: The guideline for lightning protection of wind turbines should be established based on IEC Standards. It needs to be carried out both development of software and experimental studies for understanding the types of lightning damage to wind turbines and compiling the database. In order to minimize the lightning damage to wind turbines, it is a key factor for wind farm owners and researchers to provide the information about the damage cases and wind farm operation technique.
Development of a Multistage Bollard with Up and Down Movement
Byun, Hong-Seok ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 2, 2015, Pages 15~21
DOI : 10.9726/kspse.2015.19.2.015
Bollard installed on the street is a facility that protects pedestrians by restraining cars from entering on the sidewalk. It is basically classified into manual, semiautomatic, automatic type and mostly manual type is widely used because the automatic type is imported and much expensive. However, in case of manual handling type in practice, it is very troublesome and difficult to remove it whenever cars are permitted, and in case of automatic type, since underbody of a bollard is very long, it is difficult to dig a deep hole in the ground because a pipe, a hose or a cable is under the surface. In order to reduce these difficulties, this paper proposed new design of the multistage bollard that moves up and down automatically by using hydraulic system. This is developed by 6 step creativity of TRIZ inventive problem solving and structural analysis. The developed bollard can be installed in shallow hole and allow entry of vehicles through up-and-down movement without its removal manually. Finally, we could see smoothly motion through the manufactured bollard.
Study of the Fluid Flow on Proportional Valve in Spool Displacement using CFD
Li, Kui-Ming ; Choi, Yoon-Hwan ; Lee, Ill-Yeong ; Lee, Yeon-Won ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 2, 2015, Pages 22~26
DOI : 10.9726/kspse.2015.19.2.022
The main objective of this work is to estimate the fluid flow of a proportional valve. The study is based on the classical compressible flow theory and the computations with the help of CFD based commercial software - ANSYS CFX. The fluid flow with the movement of spool along the sleeve is simulated. To change the spool moving from 0.4mm to 2.0mm, the moving mesh method with different condition of orifice is considered here. The results show that it is the highest at the 80 % (1.6mm) opening and at the 20 % (0.4mm) opening, is the lowest.
Accuracy Improvement of Stereo-Based Distance Measurement for Close Range Vessel Positioning
Ogura, Tadashi ; Mizuchi, Yoshiaki ; Kim, Young-Bok ; Choi, Yong-Woon ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 2, 2015, Pages 27~32
DOI : 10.9726/kspse.2015.19.2.027
This paper describes a distance measurement system with high accuracy that utilizes a stereo-based camera and a pan-tilt unit for automatically maintaining the positional relationship between a vessel and a target on the side of a facility at a close range. The measurement system offers an advantage in that it can measure the distance to a target while tracking it. In order to improve the ability to control the position of a vessel between it and a target while maintaining the distance especially at a close range, the accuracy of the measurement system has to be improved. The accuracy of the distance measured by our system is increased with revisions of the conclusively generated data of distance measurement. We verified the accuracy of our system from an experiment, which generated results that had an accuracy of 30 mm for distances in the range between 2-8 m.
Distance Measurement by Automatic Peak Detection for Indoor Positioning Using Spread Spectrum Ultrasonic Waves
Suzuki, Akimasa ; Miyara, Yasuaki ; Iyota, Taketoshi ; Kim, Young-Bok ; Choi, Yong-Woon ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 2, 2015, Pages 33~39
DOI : 10.9726/kspse.2015.19.2.033
In conducting indoor positioning by code division multiple access using spread spectrum ultrasonic waves, it is required to detect signals under the influence of near-far problem occurred by difference on signal power, caused by distance between transmitter and receiver. For discussing robustness to the problem, we verified measuring accuracy on distance from an experiment on a real space with a hardware device where our proposed method is mounted. The proposed method performs automatic signal detection by setting threshold level dynamically. As an experimental result, measurable distance were improved by the proposed method, and measurement errors were up to 50mm in distances from 1000mm to 6000mm; therefore, enough accuracy to realize self-localization or navigation for autonomous mobile robot or human was obtained.
A Study on the Spray and Combustion Characteristics of Direct-injection LPG
Hwang, Seong-Ill ; Chung, Sung-Sik ; Yeom, Jeong-Kuk ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 2, 2015, Pages 40~48
DOI : 10.9726/kspse.2015.19.2.040
As advantages of LPG-DI engine, LPG is directly injected into combustion chamber during compression stroke to reduce compression temperature, prevent knock and spontaneous combustion, and adjust engine output using the amount of directly injected fuel, thereby reducing pumping loss caused by throttle valve. Stratified charge can be supplied nearby spark plugs to allow for overall lean combustion, which improves thermal efficiency and can cope with problems regarding emission regulations. In addition, it is characterized by free designing of intake manifold. Despite the fact that LPG-DI has many advantages as described above, there is lack of detailed investigation and study on spray characteristics, combustion flame characteristics, and ignition probability. In this study, a visualization experiment system that consists of visualization combustion chamber, air supply control system, emission control system, LPG fuel supply system, electronic control system and image data acquisition system was designed and manufactured. For supply of stratified charge in the combustion chamber, alignment of injector and spark plugs was made linear.
A Experimental Study on the Effects of the Impingement-wall on the Spray and Combustion Characteristics of Direct-Injection LPG
Hwang, Seong-Ill ; Chung, Sung-Sik ; Yeom, Jeong-Kuk ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 2, 2015, Pages 49~56
DOI : 10.9726/kspse.2015.19.2.049
As an alternative fuel that can be used in SI engine, LPG is one of clean fuels with larger H/C ratio compared to gasoline, low
emission, and small amount of pollutants such as sulfur compounds. When LPG is used in spark ignition engine, volumetric efficiency of the engine can be improved and pumping loss can be reduced by performing direct injection into the combustion chamber instead of port fuel injection. LPG-DI engine allows for lean combustion and stratified combustion under low load. In case of stratified combustion, air fuel ratio can be greatly increased compared to theoretic mixture ratio combustion. Improved thermal efficiency of the engine and reduced pumping loss can be expected from stratified combustion. Accordingly in this study, an experimental apparatus for visualization was designed and manufactured to study the combustion process of LPG after injection and ignition, intended to examine ignition probability and combustion characteristics of spark ignition direct injection(SIDI) LPG fuel. Ambient pressure, ambient temperature and fuel injection pressure were found as important variables that affect ignition probability and flame propagation characteristics of LPG-air mixture. Also, it was verified that the injected LPG fuel can be directly ignited by spark plug under appropriate ambient conditions.
Design of Continuous Sterilizer for Retort Pouch
Park, Cheol-Jae ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 2, 2015, Pages 57~63
DOI : 10.9726/kspse.2015.19.2.057
In this paper, we developed a continuous sterilizer in order to improve the productivity of the retort product. To this end, we design the sterilizer with a product inlet, outlet, and chain for continuously conveying the retort. The temperature analysis is performed to optimize the design parameters of the internal sterilizer. The experimental apparatus is developed to verify the productivity of the sterilizer based on the temperature analysis. The test is performed to optimize the evaluation parameters using Box-Behnken design method of a response surface methodology. From the test, the productivity of the continuous sterilizer is improved over 1,000 kg/h.
Effects of SO
Mixture in Inlet Air on Combustion and Exhaust Emission Characteristic in diesel engine
Yoo, Dong-Hoon ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 2, 2015, Pages 64~69
DOI : 10.9726/kspse.2015.19.2.064
Marine diesel engines with high thermal efficiency and fuel diversity used for propulsive power have been taking charge of important position on marine transport. However, marine environment has recently focused on emissions such as nitrogen oxide and sulfur oxide which is generated from combustion of low grade fuels. EGR(Exhaust gas recirculation) system is one of effective methods to reduce the nitrogen oxide emission from marine diesel engines. In general, it is considered that recirculating gas influences fuel combustion and emissions in diesel engines. However, along with positive effects of EGR, the EGR system using fuels of including high sulfur concentration should be considered about re-combustion and activation of sulfur dioxide in recirculating gas. Therefore, in experimental study, an author investigates effects of sulfur dioxide mixture concentration in intake air on combustion and exhaust emission characteristics in a direct injection diesel engine. In results, change of sulfur dioxide concentrations in intake air had negligible impact on combustion chamber pressure, rate of heat release and emissions compared with effects of oxygen decreasing and carbon dioxide increasing of EGR.
Strength Estimation Model of Resistance Spot Welding in 780MPa Steel Sheet Using Simulation for High Efficiency Car Bodies
Son, Chang-Seok ; Park, Young-Whan ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 2, 2015, Pages 70~77
DOI : 10.9726/kspse.2015.19.2.070
Nowadays, car manufacturers applied many high strength steels such AHSS or UHSS to car bodies for weight lightening. Therefore, a variety of applied steel sheet to car bodies increased and the needs of simulation to evaluate weldability also increased in order to reduce the cost and time. In this study, resistance spot welding simulations for DP 780 Steel with 1.0 and 1.4 mm thickness were conducted with respect to lobe curve. 2 regression models to estimate tensile shear strength were suggested and they were second order polynomial regression model and optimized second order regression model. The performance of these models was evaluated in terms of the coefficient of determinant and average error rate.
Energy Load according to the Units of Apartment House
Kim, Sung-Hoon ; Lee, Jun-Gi ; Kim, Yong-Tae ; Lee, Kyung-Hee ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 2, 2015, Pages 78~83
DOI : 10.9726/kspse.2015.19.2.078
In Korea, multi-housing in one of the most common types of residential space due to its easy management and convenience. In particular, south-facing plate-type(一) multi-housing has attracted a great deal of public interest because it consumes less energy compared with other types of multi-housing, making it advantageous from an energy-saving perspective. Although there have been many studies on the annual energy consumption of multi-housing in relation to building shape and area of window, there have not been sufficient research on the annual energy consumption of multi-housing in relation to individual units of the multi-housing. The purpose of this study is to propose a strategy for reducing energy consumption in plate-type(一) multi-housing, taking the units with the lowest energy consumption as the standard. The result, Standard Models`s energy load was as 4000 ~ 5600kWh, and Passive Houses`s energy load was less than Stand Models at the 1600kWh.
Water Quality Improvement System Using High Voltage Electric Field with Self-Generation System
Kang, Rae-Yun ; Kang, Chul-Ung ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 2, 2015, Pages 84~89
DOI : 10.9726/kspse.2015.19.2.084
The occurrence of algae caused by eutrophication of fresh water is a pollution source to destroy the aquatic environment. When the high voltage electric field is applied in the water, When a high voltage is applied to the electric field in the water, the algae can be broken the balance of cell membranes, and is dead. In this paper, we develop a water quality improvement system for generating an electric field having a higher energy than the zeta potential when a high voltage is applied to 4,000V. To ensure the mobility of the water quality improvement system, we designed the PV generation system using the optimal size technique that is based on the model of power lack ratio. By evaluating the output characteristics of the water quality improvement system, power generation characteristics of the PV generation system, and battery charging characteristics, we can show that the proposed system can be applicable to the water quality improvement system inhibiting the growth rate of the algae in the fresh water.
A Study on the Characteristics of Exhaust Emissions by Biodiesel Blend Waste Oil in Marine Diesel Engine
Cho, Sang-Gon ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 2, 2015, Pages 90~95
DOI : 10.9726/kspse.2015.19.2.090
Recently worldwide concern and research is being actively conducted on green energy which can reduce environmental pollution. A plant such as the natural rapeseed oil, soybean oil, palm, etc. is used as a bio source in home and industry. Biofuels is a sustainable fuel having economically benefits and decreasing environmental pollution problems caused due to fossil fuel, and it can be applied to the conventional diesel engine without changing the existing institutional structure. Waste vegetable oil contains a high cetane number and viscosity component, the low carbon and oxygen content. A lot of research is progressing about the conversion of waste vegetable oil as renewable clean energy. In this study, waste oil was prepared to waste cooking oil generated from the living environment, and applied to diesel engine to confirm the possibility and cost-effectiveness of biodiesel blend waste oil. As a result, brake specific fuel consumption and NOx was increased, carbon monoxide and soot was decreased.