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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Society for Aviation and Aeronautics
Journal Basic Information
Journal DOI :
The Korean Society for Aviation and Aeronautics
Editor in Chief :
Volume & Issues
Volume 14, Issue 4 - Dec 2006
Volume 14, Issue 3 - Sep 2006
Volume 14, Issue 2 - Jun 2006
Volume 14, Issue 1 - Mar 2006
Selecting the target year
Unsteady Lift Measurements of the Dragonfly-type Wing
Kim, Song-Hak ; Jang, Jo-Won ;
Journal of the Korean Society for Aviation and Aeronautics, volume 14, issue 2, 2006, Pages 1~8
Unsteady lift measurements were carried out in order to investigate the effects of phase difference and reduced frequency of a dragonfly-type model with two pairs of wing. A load-cell was employed to measure the lift generated by a plunging motion of the dragonfly-type model with the incidence angles of 0
. Experimental conditions are as follows: phase differences between fore- and hind-wings are 0
, and 270
, and reduced frequencies are 0.075, 0.15 and 0.225, respectively. The freestream velocity was 143 m/sec and corresponding chord Reynolds number was
. The variation of phase-averaged lift coefficients during one cycle of the wing motion is presented. Results show that the total value of the positive lift coefficient during one cycle of the wing motion is the largest at the phase difference of 90
, and that the maximum lift coefficient and lift coefficient per unit of time increases with reduced frequency.
Development of FAA AC120-40B Level D Flight Dynamics Model for T-50 Full Mission Trainer
Jeon, Dae-Keun ; Lee, Se-Won ;
Journal of the Korean Society for Aviation and Aeronautics, volume 14, issue 2, 2006, Pages 9~16
FAA AC120-40B Level D flight dynamics model for T-50 Full Mission Trainer was successfully developed. Since AC120-40B Level D requires the quantitative validation tests for simulation model compared with flight test data, T-50 flight test data for each validation test item was gathered, and also automatic test environments which include AFT (Automatic Fidelity Tester) and STA (Simulation Test Analyzer) were developed. The final test results after the iterative test-tuning processes were all within the tolerances specified in AC120-40B Level D. Qualification Test Guide, QTG contains the detail test processes and results.
Subsonic Flutter Characteristics of a Sandwich Structure Wing with Honeycomb core
Kim, Yu-Sung ; Kim, Dong-Hyun ;
Journal of the Korean Society for Aviation and Aeronautics, volume 14, issue 2, 2006, Pages 17~26
The flutter characteristics of all movable tail wing with honeycomb sandwich structure have been studied in this study. The present wing model has a airfoil cross section and the linear variation of spanwise thickness. Structural vibration analysis is performed based on the finite element method using sandwich and beam elements. Unsteady aerodynamic technique used on the doublet lattice method has been effectively used to conduct the frequency-domain flutter analyses. The parametric flutter studies have been performed for various structural design parameters. Computational results on flutter stability due to the variation of structural parameters are presented and its related characteristics are investigated through the comparison of results.
Study on Performance Design and Sensitivity of a Liquid Ramjet Engine
Sung, Hong-Gye ;
Journal of the Korean Society for Aviation and Aeronautics, volume 14, issue 2, 2006, Pages 27~32
The performance-design algorithm of a liquid ramjet engine was studied, which showed the comparable results with CFD calculation except the shock-boundary layer interaction region. In addition to the description of the design algorithm, several important design parameters, such as equivalence ratio, combustion efficiency, air capturing factor, and flight Mach number, are evaluated as predicting one of performance factors, Isp, of a typical ramjet engine, so that the flight envelope might not be determined with narrow perspective performance-operation-area in off-design regime.
Measurement of Heat Transfer and Pressure Distributions on a Gas Turbine Vane Endwall
Lee, Yong-Jin ; Shin, So-Min ; Kwak, Jae-Su ;
Journal of the Korean Society for Aviation and Aeronautics, volume 14, issue 2, 2006, Pages 33~38
Heat transfer coefficients and static pressure distributions on a gas turbine vane endwall were experimentally investigated in a 5 bladed linear cascade. The Reynolds number based on an axial chord length and the cascade exit velocity was 500,000. Both heat transfer and pressure measurements on the vane endwall were made at the two different turbulence intensity levels of 6.8% and 10.8%. Detailed heat transfer coefficient distributions on the vane endwall region were measured using a hue detection based transient liquid crystals technique. Results show various regions of high and low heat transfer coefficients on the vane endwall surface due to several types of secondary flows and vortices. Heat transfer coefficient and endwall static pressure distributions showed similar trends for both turbulence intensity, however, the averaged heat transfer coefficients for higher turbulence intensity case was higher than the lower turbulence intensity case by 15%.
Aerodynamic Analysis of a Rectangular Wing in Flapping with Lead-Lag Motion using Unsteady VLM
Kim, Woo-Jin ; Kim, Hark-Bong ;
Journal of the Korean Society for Aviation and Aeronautics, volume 14, issue 2, 2006, Pages 39~44
The unsteady vortex lattice method is used to model lead-lag in flapping motions of a rectangular flat plate wing. The results for plunging and pitching motions were compared with the limited experimental results available and other numerical methods. They show that the method is capable of simulating many of the features of complex flapping flight. The lift, thrust and propulsive efficiency of a rectangular flat plate wing have been calculated for various lead-lag motion and reduced frequency with an amplitude of flapping angle(20o). To describe a motion profile of wing tip such as elliptic, line and circle, the phase difference of flapping and lead-lag motion was changed. And the effects of the motion profile on the aerodynamic characteristics of the flapping wing are discussed by examination of their trends.
A study on Management Strategy and Cases of Failure of Low Cost Carriers
Ha, Su-Dong ; Lee, Yun-Cheol ;
Journal of the Korean Society for Aviation and Aeronautics, volume 14, issue 2, 2006, Pages 45~55
Air transportation industry becomes more competitive because that the restrictions on new access to market were eased and related enough for each airline to choose the freight rate and the route without rein. New competitors are pursuing convergence strategy which focuses on low freight rate as a niche strategy for increasing market share by stimulating low cost demand. This strategy is now spreading all over the world such places as Europe, Asia, Oceania and etc. As of December 1, 2004, hundreds of low cost carriers are participating actively in the market and finding their level as a new strategic group in the air transportation industry with expanding their market. In case of USA, however, many airlines, which had newly entered to the market, went into bankruptcy in the mid-1980s. People Express in USA established in 1980 is one of the examples of failure. In case of Japan, Hokkaido International Airline, a typical low cost carrier which established in 1997, filed for bankruptcy. This study is for examining the strategic implication closely through the study on management strategy and cases of failure of low cost carriers.
International Comparative Study on the Government Policy and Corporate Strategy in the Aerospace Industry
Lee, Yun-Cheol ; Lim, Sang-Min ;
Journal of the Korean Society for Aviation and Aeronautics, volume 14, issue 2, 2006, Pages 56~70
Since the 90's, the world's aerospace industry have been experienced the era of radical changes. We make a comparative study about the 10 countries government policies and corporate strategies changes in this era. In this study, we figure out aerospace industry's evolutional patterns and factors through evolutionary perspective, and then, proposed development strategies and implications for Korea's aerospace industry.
Development Paradigm of Localized Small Aircraft
Jung, Do-Hee ;
Journal of the Korean Society for Aviation and Aeronautics, volume 14, issue 2, 2006, Pages 71~78
In this paper, it is described on the exportation trend and future development paradigm of the localized small aircraft which was recently developed four seated canard type aircraft for exportation purpose. Presently, even though the development of small aircraft is recessed, if we start development of the proper airplane models by integrating domestic power of industry-university-institute on the base of research experience from now on, we can go into the global market and take up the level of world top 10 makers without doubt. For successful operation of exportation system of small aircraft, it is needed to set up development strategy paradigm by forming consortium centering around the medium and small enterprises.