• Title/Summary/Keyword: operating characteristic

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Evaluation of the Aerodynamic characteristic on the Pantograph model (구매조건부 판토그라프 모델에 대한 공력특성 평가)

  • Kim, Ki-Nam;Cho, Yong-Hyeon;Ko, Tae-Hwan;Kwon, Hyeok-Bin
    • Proceedings of the KSR Conference
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    • 2009.05a
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    • pp.152-161
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    • 2009
  • This thesis aims to report the result of an evaluation of the aerodynamic characteristic on the purchase conditional pantograph model that has developed for applying to the KTX-I. Development pantograph was derived the result of aerodynamic characteristic through a wind tunnel test. And design modification was proceeded to solve the difference of aerodynamic characteristic by pantograph's operating direction. The verification test and adjustment test about the modified pantograph's aerodynamic characteristic were progressed on the KTX-I. To be corresponded with requirements, the airfoil and spoiler were used.

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Analysis on Dynamic Characteristic and Circuit Parameter of Linear Switched Reluctance Motor by Electromagnetic Analytical Method (전자기 해석법에 의한 직선형 스위치드 릴럭턴스 전동기의 회로정수 도출 및 동특성 해석)

  • Park, Ji-Hoon;Ko, Kyoung-Jin;Choi, Jang-Young;Jang, Seok-Myeong
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.2
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    • pp.318-327
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    • 2010
  • This paper deals with analysis on dynamic characteristic and circuit parameter of linear switched reluctance motor by electromagnetic analytical method. Above all, using space harmonic method, which is electromagnetic method, the air-gap flux density is analyzed in the both align and unaign positions, and the inductance profile, force characteristic and resistance per phase are calculated by means of the process. The validity of the analyzed results are demonstrated by the finite element method(FEM) and manufacture of the prototype machine. Second, the dynamic simulation is analyzed by the use of circuit parameters derived from analytical method, and the operating system of the prototype machine is manufactured to demonstrated the validity of simulation analysis. As a result, it is considered that the characteristic equation suggested in this paper will contribute to the design, analysis and application of LSRM.

Design of White Balance Correction Processor for High Resolution Full Color LED Display System (고해상도 천연색 LED 디스플레이 시스템을 위한 흰색 보정프로세서의 설계)

  • Lee, Jong-Ha;Ko, Duck-Young
    • 전자공학회논문지 IE
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    • v.46 no.3
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    • pp.12-18
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    • 2009
  • In this paper, we developed white balance correction processor for Full Color LED Display System which could be display uniformity color and soft light by adjusting brightness of red, green, blue pixel, individually. This processor correct brightness by calculating operating current of each pixel(red, green, blue LED) on the basis of characteristic curve of LED device when we named "a" as a specific characteristic value, "b" as a brightness correction value according to using time, "X" as a operating current value, and "Y" as brightness value. As the results, we solved the reduction problem of brightness for long used LED devices, according to increase entire mean of brightness value by adjusting "b" value from the brightness characteristic function.

The comfort evaluation and analysis of the urban rail vehicle (도시철도차량 시트의 안락성 평가 및 분석)

  • Goo, Jae-Kwang;Suh, Woo-Sung;Choi, Se-Hwa
    • Proceedings of the KSR Conference
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    • 2007.11a
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    • pp.222-228
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    • 2007
  • In order to solve the problem of traffic holdups and environmental pollution(contamination), several metropolises are operating the subway and many local government plans hereafter the light rail vehicle operation and it is in the process of preparing. This point of time, it need to evaluate the comfortable characteristic of the seat which is closely connected with passenger and it should be reflected to the product design through the data analysis. The methods of the comfortable characteristic evaluation should be considered to various methods from physical factor to psychological factor. Among these, the most universal and possible quantitative measurement estimate through 'Body pressure measurement system'. From this paper, it was measured the body pressure of the subway seat which is in the process of operating in a domestic and it will be compared and analyzed the material & seat shape, so we evaluated the comfortable characteristic of the short-distance transportation railway vehicle. It was operated the man and woman who belongs in standard shape of Korean, we compared and analyzed the Peak position where the body pressure is visible and body pressure spread out.

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Effects of Hydrophilic Treatment by IAR Method on the Packing Characteristic Value (이온 보조 반응법에 의한 친수성 처리가 충전재 특성값에 미치는 영향)

  • Kim, Jin-Ho;Choe, Chung-Hyeon;Gang, Byeong-Ha;Lee, Jae-Heon
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.25 no.4
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    • pp.554-560
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    • 2001
  • Hydrophilic treatment of the packing materials in a cooling tower has been made by the ion assisted reaction (IAR) method to increase the wettability of the packing materials. The effects of hydrophilic treatment of packing materials on the performance of a cooling tower have been investigated in a wide range of operating parameters, such as water flow rate, air flow rate, and the water inlet temperature. A pilot cooling tower has been designed and built to model a counter-flow cooling tower. The results obtained indicate that the packing characteristic value with hydrophilic packing could be substantially increased by 6∼19.3% than that with conventional packing in the operating ranges considered. The correlations of the packing characteristic value as a function of water-to-air ratio are suggested for a counter-flow cooling tower with hydrophilic packing as well as with conventional packing.

Efficiency of Removal for PM10 and $NO_2$ by Air Cleaner in Residential Indoor Environment with Monte-Carlo Simulation (확률론적 모의실험을 이용한 공기청정기의 실내공기중 PM10과 $NO_2$ 제거효율에 관한 연구)

  • Lee , Cheol-MIn;Kim , Yoon-Shin;Lee , Tae-Hyung;Kim , Jong-Cheol;Kim , Jung-Ho
    • Journal of Environmental Health Sciences
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    • v.30 no.3
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    • pp.221-229
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    • 2004
  • We estimated decreasing rate of indoor air pollutants which are PM10 and $NO_2$ by the air cleaner in indoor environment. This study respectively examined concentration of PM10 and $NO_2$ two times in 34 sites located in Seoul and Kyung-gi Do from April to September in 2003. Sectional period was respectively divided for operating the air cleaner and non-operating the air cleaner. Moreover, questionnaire was executed to grasp physical characteristic of objective building and residential characteristic of residents by using method of self-entry. There was a trend that concentration of PM10 and $NO_2$ separated number of residents during operating period respectively decreased among indoor air. According to the existence of smoker in indoor, both concentration of PM10 and $NO_2$ during operating period decreased in each case, and according to existence of pets, both cases decreased concentration of pollutants by operating the air cleaner. We used Monte-Calro simulation to remove uncertainty and identify efficiency of eliminated pollutants such as PM10 and $NO_2$ by the air cleaner. Average efficiency of removal for PM10 and $NO_2$ were 61.84${\pm}$23.04% and 48.67${\pm}$18.03% respectively.

Implementation of The Fluid Circulation Blood Pressure Simulator (유체 순환 혈압 시뮬레이터의 구현)

  • Kim, C.H.;Lee, K.W.;Nam, K.G.;Jeon, G.R.
    • Journal of Biomedical Engineering Research
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    • v.28 no.6
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    • pp.768-776
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    • 2007
  • A new type of the fluid circulation blood pressure simulator was proposed to enhance the blood pressure simulator used for the development and evaluation of automatic sphygmomanometers. Various pressure waveform of fluid flowing in the pipe was reproduced by operating the proportional control valve after applying a pressure on the fluid in pressurized oil tank. After that, appropriate fluid was supplied by operating the proportional control valve, which enabled to reproduce various pressure wave of the fluid flowing in the tube. To accomplish this work, the mathematical model was carefully reviewed in cooperating with the proposed simulator. After modeling the driving signal as input signal and the pressure in internal tube as output signal, the simulation on system parameters such as internal volume, cross-section of orifice and supply pressure, which are sensitive to dynamic characteristic of system, was accomplished. System parameters affecting the dynamic characteristic were analyzed in the frequency bandwidth and also reflected to the design of the plant. The performance evaluator of fluid dynamic characteristic using proportional control signal was fabricated on the basis of obtained simulation result. An experimental apparatus was set-up and measurements on the dynamic characteristic, nonlinearity, and rising and falling response was carried out to verify the characteristic of the fluid dynamic model. Controller was designed and thereafter, simulation was performed to control the output signal with respect to the reference input in the fluid dynamic model using the proposed proportional control valve. Hybrid controller combined with an proportional controller and feed-forward controller was fabricated after applying a disturbance observer to the control plant. Comparison of the simulations between the conventional proportional controller and the proposed hybrid simulator indicated that even though the former showed good control performance.

The analysis of the operating characteristic for the wideband coaxial line impedance transformer (광대역 동축선로 임피던스 변환회로의 동작 특성 분석)

  • Park, Ung-hee
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.23 no.2
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    • pp.165-172
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    • 2019
  • Using two or more coaxial lines, if one port is connected in series and the other port is connected in parallel, it can be implemented the wideband transmission line transformer(TLT). Because the wideband TLT utilizes the outer conductor of the coaxial line, it is difficult to predict the characteristics. In this paper, based on the analysis for the transfer characteristic(S21) according to the loss of the each line in ${\lambda}/4$-microstrip line TLT, the operating characteristic of the fabricated wideband 4:1 TLT using two $25{\Omega}$-coaxial lines is investigated. The fabricated wideband TLT shows the notch characteristic in which the transfer signal sharply decreases at ${\lambda}/4$ frequency of the coaxial line and has a value within -0.2dB of the transfer characteristic(S21) in $0.06{\sim}0.2{\lambda}$ frequency range of the coaxial line. This transfer characteristics(S21) can change the operating frequency range slightly and set the optimum transfer characteristic(S21) at the desired frequency by changing the length of the microstrip line.