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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society for Aviation and Aeronautics
Journal Basic Information
Journal DOI :
The Korean Society for Aviation and Aeronautics
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Volume & Issues
Volume 18, Issue 4 - Dec 2010
Volume 18, Issue 3 - Sep 2010
Volume 18, Issue 2 - Jun 2010
Volume 18, Issue 1 - Mar 2010
Selecting the target year
Damage Analysis of Turbopump Turbine considering Creep-Fatigue effects
Lee, Mu-Hyoung ; Jang, Byung-Wook ; Kim, Jin-Han ; Jeong, Eun-Hwan ; Jeon, Seong-Min ; Lee, Soo-Yong ; Park, Jung-Sun ;
Journal of the Korean Society for Aviation and Aeronautics, volume 18, issue 1, 2010, Pages 1~10
Structures under high temperature may have creep behavior and fatigue behavior. Durability study of the structures need the damage analysis with the creep-fatigue effects. In this paper, the damage analysis is studied for a turbine blade in the turbopump for a liquid rocket engine which is operated under high temperature condition. First of all, the load cycle is required for defining the operational characteristics of turbopump. The thermal stress analysis is done for a turbine blade of the turbopump. The stress analysis results are used to judge damage due to the creep and the fatigue. The strain-life method with miner rule is used for fatigue damage analysis. The Larson-Miller parameter master curve and robinson rule are used for the creep damage analysis. The linear damage summation method is used to consider creep-fatigue effects of turbopump turbine. Finally, the analysis results for fatigue and the influence are compared to figure out the damage phenomenon of the turbopump turbine.
Quality Monitoring Method Analysis for GNSS Ground Station Monitoring and Control Subsystem
Jeong, Seong-Kyun ; Lee, Sang-Uk ;
Journal of the Korean Society for Aviation and Aeronautics, volume 18, issue 1, 2010, Pages 11~18
GNSS(Global Navigation Satellite System) Ground Station performs GNSS signal acquisition and processing. This system generates error correction information and distributes them to GNSS users. GNSS Ground Station consists of sensor station which contains receiver and meteorological sensor, monitoring and control subsystem which monitors and controls sensor station, control center which generates error correction information, and uplink station which transmits correction information to navigation satellites. Monitoring and control subsystem acquires and processes navigation data from sensor station. The processed data is transmitted to GNSS control center. Monitoring and control subsystem consists of data acquisition module, data formatting and archiving module, data error correction module, navigation determination module, independent quality monitoring module, and system maintenance and management module. The independent quality monitoring module inspects navigation signal, data, and measurement. This paper introduces independent quality monitoring and performs the analysis using measurement data.
Performance Evaluation of Double-Differencing Position-Domain Hatch Filter By a Landing Experiment
Kim, Hee-Sung ; Joo, Jung-Min ; Lee, Hyung-Keun ;
Journal of the Korean Society for Aviation and Aeronautics, volume 18, issue 1, 2010, Pages 19~26
To expand the application area of global navigation satellite systems, precision landing is one of the most critical area to be solved. For the development and validation of the precision landing system, many aspects need to be analyzed including the system architecture, signal characteristics, atmospheric delay, communication delay, accuracy, integrity, and availability. Among them, the signal characteristics analysis requires the processing of measurements collected by real-flight experiments. This paper presents the processing results of the real measurements collected by a flight and landing experiment. To process and analyze the data, double differencing position-domain hatch filter is utilized. Accuracy of the proposed filter is evaluated utilizing reference trajectory generated by commercial software. Finally, by comparing with conventional range domain characteristics of position domain filter is analyzed.
Transonic Flutter Characteristics of the AGARD 445.6 Wing Considering DES Turbulent Model and Different Angle-of-Attacks
Kim, Yo-Han ; Kim, Dong-Hyun ;
Journal of the Korean Society for Aviation and Aeronautics, volume 18, issue 1, 2010, Pages 27~32
In this study, transonic flutter response characteristics have been studied for the AGARD 445.6 wing considering various turbulent models and several angle of attacks. The developed fluid-structure coupled analysis system is applied for flutter computations combining computational structural dynamics(CSD), finite element method(FEM) and computational fluid dynamics(CFD) in the time domain. The flutter boundaries of AGARD 445.6 wing are verified using developed computational system. For the nonlinear unsteady aerodynamics in high transonic flow region, DES turbulent model using the structured grid system have been applied for the wing model. Characteristics of flutter responses have been investigated for various angle of attack conditions. Also, it is typically shown that the current computation approach can yield realistic and practical results for aircraft design and test engineers.
A Numerical Investigation of External and Internal Heat Transfer in A High Subsonic in Turbine Cascade
Kim, Woo-Jin ; Kim, Hyun-Shik ; Kwak, Jae-Su ; Kim, Hark-Bong ;
Journal of the Korean Society for Aviation and Aeronautics, volume 18, issue 1, 2010, Pages 33~38
Developments of numerical methods are very important to design and analysis for a high subsonic turbine blade. In general, Analysis by experimental investigation has needed a lot of human resources and required time, indispensably, and equipments still have a limit to measure in conditions of high temperature. Rapid technological developments of CPU and integration level of memory make it possible to advance computation with almost exactly simulation so, recent developments of numerical methods are in spotlight. In the present study, the panel method, which is well-known as relatively simplified numerical method, and 2-dimensional ordinary differential Falkner-Skan equation were computed in order to analyze the outer flow, and FVM-based solid heat transfer equation, was also computed to forecast the temperature distribution of the airfoil and the turbine blade. Unstructured grid was constructed in the turbine blade, which has double cooling holes, in order to analyze the internal heat transfer. Cooling fluid was assumed as fully-developed turbulent flow and that circulated in cooling holes.
Dynamic Determination of IMM Mode Transition Probability for Multi-Radar Tracking
Jeon, Dae-Keun ; Eun, Yeon-Ju ; Ko, Hyun ; Yeom, Chan-Hong ;
Journal of the Korean Society for Aviation and Aeronautics, volume 18, issue 1, 2010, Pages 39~44
A method is presented of dynamic determination of mode transition probability for IMM in order to improve the accuracy performance of maneuvering target tracking for air traffic control surveillance processing system under multiple radar environment. It is shown that dynamic determination of mode transition probability based on the time intervals between the data input from multiple radars gives the optimized performance in terms of position estimation accuracy.
A Study on CNS/ATM and Performance Based Navigation
Kim, Chang-Hwan ; Jeong, Jong-Chul ; Kang, Ja-Young ;
Journal of the Korean Society for Aviation and Aeronautics, volume 18, issue 1, 2010, Pages 45~50
Air Traffic Management aims to fulfill the requirement of the aviation demander by constructing the most effective and safety aviation systems for providing safety and cost-effective service. All concerned parties of aviation present the needs of improving Air Traffic Management system for solving the issue of the current system and the air traffic capacity in the 21st century, and introduce the significant improvements from the conventional technology and method for the past 40 years. Accordingly, ICAO promotes the development of innovative procedures and technologies to solve the problems and meet the demands. It is the concept of Performance based Navigation(PBN) based on Communication, Navigation, and Surveillance/Air Traffic Management(CNS/ATM). This study defines differences between RNAV and RNP RNAV as methods of air navigation based on the CNS/ATM, and needs and requirements of PBN as an emerging global standard. It also outlines basic elements supporting and implementing the PBN concept.
Analysis of the Difference in Pilot Error by Using the Signal Detection Theory
Kwon, Oh-Young ;
Journal of the Korean Society for Aviation and Aeronautics, volume 18, issue 1, 2010, Pages 51~57
This study was to analyze the difference in pilot error by using the Signal Detection Theory. The task was to detect the targeted aircraft(signal) which is different shape from many other aircraft(noise). From the two experiments, we differentiated the task difficulty followed by change in noise stimuli. Experiment 1 was to search the signal stimuli(fighter plane) while the noise stimuli(cargo plane) were increasing. The results from the Experiment 1 showed the tendency to decrease the hit rate by increasing the number of noise stimuli. However, the false alarm rate was not increased. The sensitivity(d') showed quite high. In Experiment 2, a disturbance stimulus(helicopter) was added to noise stimuli. The result was generally similar to those of Experiment 1. However, the hit rate was lower than that of Experiment 1.
The Research on the Development of Passenger Helmet to Prevent Head Trauma
Lim, Jeong-Ku ; Kweon, Ghi-Sun ; Dodge, Robin E. ;
Journal of the Korean Society for Aviation and Aeronautics, volume 18, issue 1, 2010, Pages 59~65
Introduction : Head trauma is the main cause of death in aircraft crash. In a Michigan study of structurally survivable, fatal accidents, 80% of the fatally injured had received head trauma. We tried to develop a new helmet for passengers, and perform its efficiency test. Methods : An aircraft helmet requires an excellent protection against head trauma, lightness, and small volumes. In addition, it must be wearable, fire resistant, and non toxic when it is burning. We developed two new helmets made from silicone foam which met all theses requirements. One was thin (2.5cm), and the other was thick (6.3cm). These looked like a motorcycle helmet and had only a soft silicone as liner material without an outer hard shell. Therefore we can carry them easily inside aircrafts. The standard test for helmet is Snell's drop test. It measures the impact acceleration of head shaped metal wearing helmet during we drop it at certain heights. Impact sites were total 5 sites (front, back, right, left and top) for each helmet. All these sites were impacted twice. Results : The thickness of impact sites varied from 2.5cm to 6.3cm. The impact acceleration of 2.5cm thickness site when it was dropped from 1.0 meter was 379g. But, that of 6.3cm thickness site when it was dropped from 1.5 meter was only 163g. Unfortunately, both helmets didn't meet the Snell Standard for motorcycle helmets. Discussion : If we add suitable outer hard shell, and change its thickness and design, the efficiency will be increased. A study indicated that helmet could reduce the risk of head trauma up to 85%. We made helmet for passengers in aircraft crash for the first time. If we improve its weak points, it will decrease the frequency of head trauma in aircraft craft.
Correlation of similar call-signs aircraft and human error in ATC
Moon, Woo-Choon ;
Journal of the Korean Society for Aviation and Aeronautics, volume 18, issue 1, 2010, Pages 66~73
As the ultimate goal of the Aeronautical communication is delivery of information, it is essential to communicate via accurate use of language; there are possibilities of errors occurring as the exchange of information between pilot and air traffic controller is conducted through radio communication. Especially, there are frequently reported errors in radio communication in the event that two or more aircrafts using similar call-signs are operated in one sector. In this paper, a list of errors, which can possibly caused by air traffic controllers when controlling airplanes using similar call-signs, was derived through preceding researches and theories related to similar call-signs and human errors. Based on this list, an experiment was conducted on 52 air traffic controllers working at "J" international airport. For this experiment, ATC2K which is a simulated approach control radar developed in Korea, was used; and a regression formula was derived by analyzing the quantity of frequency change in error occurrence when controlling two or more airplanes using similar call-signs base on a premeditated scenario.The data presented in this research has useful findings and concepts for understanding the errors that can possibly occur while controlling airplanes using similar call-signs.
Expert-novice differences in visual information processing in air traffic control
Kwon, Hyok-Jin ; Ham, Seong-Soo ; Kim, Hye-Jeong ; Han, Jung-Won ; Sohn, Young-Woo ;
Journal of the Korean Society for Aviation and Aeronautics, volume 18, issue 1, 2010, Pages 74~84
This study investigated how air traffic controllers (ATCs) perceive the visual information on radar screen and examined quantitative and qualitative differences as a function of expertise. Little research has shown that how much information is processed by ATC visually and perceptually, how ATCs represent the information, and what difference exists between experts and novices. Participants were asked to draw representing visual information on the blank sector map after a 5-second exposure. Data were analyzed by a superimposing method to identify correctly represented information. Results showed that the expert group had much larger size of chunking and their pattern was wider and more accurate than the novice group. The practical application and methodological implications are also discussed for further research.
A Study on the effect of the Scholastic Aptitude Test on flight aptitude
Noh, Yo-Sup ;
Journal of the Korean Society for Aviation and Aeronautics, volume 18, issue 1, 2010, Pages 85~90
The study is intended to help to select the pilot candidates with exceptional flight aptitude ability and to investigate the relationship between the results of the scholastic aptitude test and the flight aptitude. It is intended that the research will help to draw recommendations on the relevant fields of the scholastic aptitude test that is to be used to select the high caliber candidates with exceptional flight aptitude ability, to gauge the resulting effectiveness of its application and helping to revise the university's syllabus accordingly. From the study, korean, mathematics, english grade and the flight aptitude test results have all shown to hold mutual relationship and through simple correlation analysis, it was discovered that mathematics and English are the two factors that affect the results of the flight aptitude test, with the extent of its impact graded in descending order of English, mathematics and Korean. Lastly, the logistic regression analysis have discovered that the mathematics grade has significant effect on the classification of the flight aptitude and non aptitude category groups, and English also has significant influence close to the 0.05 p-values. It is believed that should the findings of this study be considered as part of the selection process of the university applicants of the department of aeronautical science, making discovery of candidates of higher quality is expected.
The Analysis of the the characteristics of Korean peninsula Aircraft Turbulence Index using KWRF
Kim, Young-Chul ;
Journal of the Korean Society for Aviation and Aeronautics, volume 18, issue 1, 2010, Pages 91~101
The purpose of this study is analysis of Korean peninsula aircraft turbulence using the numerical weather prediction model, KWRF with the various turbulence index and pilot weather report data. Compared with the pilot weather report data and Calculated the turbulence index using the KWRF model result, many turbulence index show the similar horizontal distribution, except for the TUB2 and VWS. The analysis of vertical structure of turbulence, there are some difference each turbulence index respectively, but severe turbulence turn up in 15,000ft almost turbulence index. above 20,000ft height, intensity of turbulence vary each turbulence index. Through this turbulence study, It is founded on the research and development of the Korean peninsula aircraft turbulence