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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
Aerodynamics and Flight Control of Air Vehicle with Variable Span Morphing Wing
Bae, Jae-Sung ; Hwang, Jai-Hyuk ; Park, Sang-Hyuk ; Kim, Jong-Hyuk ;
Journal of the Korean Society for Aviation and Aeronautics, volume 18, issue 4, 2010, Pages 1~8
In the aerospace field, the study on a morphing-wing is in progress to improve flight performance and perform multi flight mission. There are many concepts of morphing-wing such as camber-change, wing-twist, variable-span, and so on. In this study, the aerodynamic characteristics and flight control of an air vehicle with a variable-span morphing wing (VSMW) have been investigated. VSMW with symmetric span control(SSC) can increase cruising range of aircraft by reducing drag in various flight condition. VSMW with anti-symmetric span control(ASSC) can be used in the roll control of an aircraft. The flight control about pure rolling dynamic system and full dynamic system have been performed about the cruise missile.
Sensor Redundancy Management using Kalman Filter for a Duplex Filght Control System
Lee, Seung-Hyun ; Lee, Jang-Ho ; Kim, Eung-Tae ; Sung, Ki-Jung ;
Journal of the Korean Society for Aviation and Aeronautics, volume 18, issue 4, 2010, Pages 9~15
This paper presents a duplex flight control system of design concepts and sensor fault detection algorithm using Kalman Filter. The algorithm was verified to use HILS that is composed of two FCCs, motion table, visualization system, cockpit, and flight model computer. The FCC was developed to be able to mount on small aircraft.
Test Setup for Flight Sensor Dynamics and Compensation of Time-delayed Position Output
Park, Sang-Hyuk ; Lee, Sang-Hyup ;
Journal of the Korean Society for Aviation and Aeronautics, volume 18, issue 4, 2010, Pages 16~20
The dynamic characteristics of flight sensors is obtained by a simple method that deploys a pendulum with a rotary encoder. The encoder output is used with kinematic relations to derive reference signals for various flight sensors, including position, velocity, attitude, and angular rate sensors as well as accelerometer and magnetic sensors. A time delay of 0.4 seconds is found in the position output of the flight sensor under investigation. A logic to compensate for the time delay using a velocity information is proposed and validated in flight tests.
Study on the Parameter Estimation for Flight Dynamic Linear Model of Light Sport Aircraft
Kim, Eung-Tai ; Seong, Kie-Jeong ; Cremer, Matthias ; Hischier, Damian ;
Journal of the Korean Society for Aviation and Aeronautics, volume 18, issue 4, 2010, Pages 21~29
The main purpose of this study is to obtain linear models for the design of automatic flight controller in order to operate the Light Sport Aircraft as unmanned air vehicle. Flight test equipments installed on the aircraft to acquire flight test data are described and maneuvers for practical speed calibration are introduced. Parameters for the linear models of lateral and longitudinal motion are estimated by the Output error method as well as trim data analysis using the flight test data. Simulated data using the estimated parameters is shown to agree well with the measurement data. Estimated parameters obtained for several flight conditions can be used to improve the aerodynamic database of the simulation program.
A Study on Dynamic Modelling and Mass Properties Estimation of the Lunar Module
Shim, Sang-Hyun ; Kim, Kwang-Jin ; Lee, Sang-Chul ; Ko, Sang-Ho ; Rhyu, Dong-Young ; Ju, Gwang-Hyeok ;
Journal of the Korean Society for Aviation and Aeronautics, volume 18, issue 4, 2010, Pages 30~37
This paper deals with attitude determination and parameter estimation problems for a lunar module. For this we first derive equations of motion for the lunar module by considering allocation locations (configurations) of reaction thruster and a reaction wheel assembly. The lunar module is assumed as a rigid body. In order to include the effect of fuel sloshing on the dynamics of the lunar module, we model it as a spherical pendulum for a simple analysis. For estimating angular rates and moment of inertia of the module, we employ an extended Kalman filter and the least mean square algorithms, respectively. Finally we construct a dynamical model for the lunar module by combining all these elements.
A Study on Reliability Assessment of Aircraft Structural Parts
Kim, Eun-Jeong ; Won, Jun-Ho ; Choi, Joo-Ho ; Kim, Tae-Gon ;
Journal of the Korean Society for Aviation and Aeronautics, volume 18, issue 4, 2010, Pages 38~43
A continuing challenge in the aviation industry is how to safely keep aircraft in service longer with limited maintenance budgets. Therefore, all the advanced countries in aircraft technologies put great efforts in prediction of failure rate in parts and system, but in the domestic aircraft industry is lack of theoretical and experimental research. Prediction of failure rate provides a rational basis for design decisions such as the choice of part quality levels and derating factors to be applied. For these reasons, analytic prediction of failure rate is essential process in developing aircraft structure. In this paper, a procedure for prediction of failure rate for aircraft structural parts is presented. Cargo door kinematic parts are taken to illustrate the process, in which the failure rate for Hook part is computed by using Monte Carlo Simulation along with Response Surface Model, and system failure rate is obtained afterwards.
Probabilistic Analysis of Dynamic Characteristics of Structures considering Joint Fastening and Tolerance
Won, Jun-Ho ; Kwang, Kang-Jin ; Choi, Joo-Ho ;
Journal of the Korean Society for Aviation and Aeronautics, volume 18, issue 4, 2010, Pages 44~50
Structural vibration is a significant problem in many multi-part or multi-component assemblies. In aircraft industry, structures are composed of various fasteners, such as bolts, snap, hinge, weld or other fastener or connector (collectively "fasteners"). Due to these, prediction and design involving dynamic characteristics is quite complicated. However, the current state of the art does not provide an analytical tool to effectively predict structure's dynamic characteristics, because consideration of structural uncertainties (i.e. material properties, geometric tolerance, dimensional tolerance, environment and so on) is difficult and very small fasteners in the structure cause a huge amount of analysis time to predict dynamic characteristics using the FEM (finite element method). In this study, to resolve the current state of the art, a new approach is proposed using the FEM and probabilistic analysis. Firstly, equivalent elements are developed using simple element (e.g. bar, beam, mass) to replace fasteners' finite element model. Developed equivalent elements enable to explain static behavior and dynamic behavior of the structure. Secondly, probabilistic analysis is applied to evaluate the PDF (probability density function) of dynamic characteristics due to tolerance, material properties and so on. MCS (Monte-Carlo simulation) is employed for this. Proposed methodology offers efficiency of dynamic analysis and reality of the field as well. Simple plates joined by fasteners are taken as an example to illustrate the proposed method.
A Study on the characteristics of the Signals of AE according to Fracture mode of CFRP under Tensile load
Lee, Kyung-Won ; Lee, Sang-Yun ; Nam, Jun-Young ; Lee, Jong-Oh ; Lee, Sang-Yul ; Lee, Bo-Young ;
Journal of the Korean Society for Aviation and Aeronautics, volume 18, issue 4, 2010, Pages 51~58
Recently, aerospace structures have lightweight trend in order to reduce the cost of fuel and system, Carbon Fiber Reinforced Plastic (CFRP) can give the ability to reduce weight at 20~50% as the substitution of metal alloy, and there are advantages such as high Non-rigid, specific strength and anti-corrosion, but it is difficult to prove its destruction properties due to heterogeneous structure and anisotropy. In this study we designed specimen, inducing distinguishing destructions of material (for example, matrix crack, fiber breakage, and delamination) by using the Carbon Fiber Reinforced Plastic (CFRP) which is used in a real aircraft, to apply acoustic emission technique to aerospace structures. And we gained data via tensile testing and acoustic emission technique, from which each fault signal was classified respectively by using AE parameters and waveform.
A Study on Acoustic Emission Characteristics of CFRP in aircraft operations
Lee, Kyung-Won ; An, Ju-Seon ; Hwang, Woong-Gi ; Lee, Jong-Oh ; Lee, Sang-Yul ; Lee, Bo-Young ;
Journal of the Korean Society for Aviation and Aeronautics, volume 18, issue 4, 2010, Pages 59~66
Aerospace structures need high stability and long life because many personal injuries can result from an accident and securing structural integrity for various external environments is more important than any other thing. So first of all we must prove the destruction properties for operating environment, have prediction technology about damage evolution and life, and develop an economical non-destructive technology capable of detecting structure damage. Acoustic emission (AE) have no need of artificial environment like ultrasonic inspection or radio fluoroscopy to emit a certain energy, is a testing technique using seismic signal resulting from interior changes of solids, and enables to observe if any fault is appeared and it grows seriously or not while running. In this study we suggest the method of structural integrity evaluation for aerospace structures through the acoustic emission technique, for which a model plane was manufactured and an actual operation test was conducted.
Performance Analysis and Design Optimization of Multi-Rate Spring Brake System
Jung, Eui-Man ; Won, Jun-Ho ; Choi, Joo-Ho ; Shim, In-Seob ;
Journal of the Korean Society for Aviation and Aeronautics, volume 18, issue 4, 2010, Pages 67~72
In this study, performance analysis and design optimization is carried out for a multi-rate spring brake system, which is used in a cable ride to stop the arriving passengers in safe and comfortable manner. Mathematical model for the spring is developed toward the objective of minimizing the impact at the arrival while satisfying the constraint of limited distance at the stop. Matlab code is utilized to examine parameters affecting the performance of the brake system. The results are validated by a commercial software RecurDyn. Kriging meta model is used to reduce the computational cost of the analysis. Optimization is conducted by RecurDyn, from which the design parameters are determined that minimizes the impact at the stop.
A study on the Unmanned Aerial Vehicle(UAV) Flight Test Planning Establishment through Atmospheric Considerations
Kim, Yeong-Rae ; Lee, Jeong-Suk ; Lee, Sang-Cheol ; Ko, Sang-Ho ; Kang, Ja-Yeong ; Choi, Jong-Uk ; Seong, Deoky-Yong ;
Journal of the Korean Society for Aviation and Aeronautics, volume 18, issue 4, 2010, Pages 73~79
Flight test is the final and a mandatory process for the development of unmanned aerial vehicles(UAVs) as well as manned. Since most UAVs fly in a low speed and are prone to adverse weather conditions such as air turbulence, atmospheric weather environment around flight test regions will be a critical item to be considered for a flight test planning for UAVs. In this paper, we suggest a decision method for a UAV flight test schedule based on weather conditions of surface and upper atmospheres and also introduce a program for an effective flight test planning through weather forecasts.
Perceptions about the Aviation Safety of the student pilots depending on the proficiency in Flight Training
Bok, Jung-Jin ; Pak, Seon-Rae ; Choi, Youn-Chul ;
Journal of the Korean Society for Aviation and Aeronautics, volume 18, issue 4, 2010, Pages 80~85
The study of the safety perceptions between two groups, trained and untrained student pilots were compared as pre-studies of that how the safety perceptions of the flight instructors affect that of the student pilots. As a results, the factors of the communication and the safety procedures shows higher values on the one-year trained group than the other because the trained students get used to the safety procedures which are necessary to the practical training. In reliability for the flight instructor, the factors of two groups show the high tendency without regard to groups. Despite of the lack of the specific research, the result implies that the student pilots are influenced by the safety perceptions of the flight instructors. In addition, the factors of the accident report were investigated as that the trained group has lower mean, however the factors of the receiving penalties of the trained group were higher than the other. These results imply that the trained group feels concern for the penalties and the punishments by reporting the accidents in spite of amounts of the training.
A Study on Optimal Design of the Fighter Igloo Diffuser
Yoon, Yong-Hyun ;
Journal of the Korean Society for Aviation and Aeronautics, volume 18, issue 4, 2010, Pages 86~91
New Design configurations of the fighter aircraft igloo diffuser were studied based on the closed ventilation type in contrast to the conventional open distribution type. To validate the enhanced and safe performance, the exhaust flow patterns of the two igloo diffuser types were simulated by both experimental and computational approaches as design tools. Flow visualizations were conducted to investigate the exhaust flow patterns in experimental approach. In addition, the commercial code called Fluent was used to calculate flow field properties. Computational simulations provided detailed parametric studies that significantly reduced the amount of experimentation necessary to alter the design parameters of the existing fighter igloo diffuser. The closed ventilation type of the igloo diffuser was shown the better results.
Factors predicting pilots' performance in routine and non-routine situations
Lee, Kyung-Soo ; Sohn, Young-Woo ;
Journal of the Korean Society for Aviation and Aeronautics, volume 18, issue 4, 2010, Pages 92~99
This study aimed to provide empirical evidence about expert performance approach in aviation field and the results suggested that the amount of experience(e.g. total flight hour) is necessary but not sufficient index of a pilot's expertise or superior performance. 43 pilots participated and completed a spatial span task and SA (situation awareness) tasks. To explore the factors predicting the performance in routine and non-routine situations, discriminant analysis was conducted. The results of discriminant analysis indicated that different variables are related with the performance in routine and non-routine situation. The factors predicting performance in routine situation were the spatial span scores and total flight hours. On the other hand, the factors predicting performance in non-routine situation were age and the qualification for instrument flying. In real world, total flight time which represents the quantity of experience has been frequently used to predict flight abilities and as an important index of expertise. The results of this study suggest that these kinds of factors have to be used cautiously to predict the performance in abnormal situation.
An Analysis of ADS-B Operational Performance by the Balanced Scorecard
Kim, Doh-Yeon ; Ryu, Jong-Hyeon ;
Journal of the Korean Society for Aviation and Aeronautics, volume 18, issue 4, 2010, Pages 100~105
This study is to analyze the performance for ADS-B(Automatic Dependent Surveillance-Broadcast) operations by the Balanced Scorecard(BSC). It is also to collect the opinions of users(pilots, air traffic controllers and ground operators) relating ADS-B and to use the results as data about preparing political measures of aviation safety. For these purpose, BSC model redesigned on 4 different points of view is used for measuring the performance of the ADS-B operation. The proposed perspectives are affairs effectiveness, user orientation, system orientation and the capacity. As the results of this study, it is showed that the continuous development of ADS-B should be required and the users must be involved in the activities, additionally, the relevant authorities should try to be drawn the user-oriented results through the process.
A Study on Flight Operation Procedures of Incheon International Airport for Noise Abatement in and around Gangwha Island
Yoo, Byeong-Seon ; Song, Byung-Heum ;
Journal of the Korean Society for Aviation and Aeronautics, volume 18, issue 4, 2010, Pages 106~112
After a series of aircraft noise measurements conducted in Noise Sensitive Areas(NSAs) in Gangwha Island, there appeared to be no regions affected by aircraft noise of over 75 WECPNL, the legal noise level standard for aircraft operations. However, with regard to the future environment where flight operations at Incheon International Airport are likely to escalate, an INM analysis result drawn shows that the number of regions afflicted by such noise will increase in Gangwha Island. Therefore, we studied similar cases from developed countries, which are pertinent to solutions for aircraft noise abatement in the vicinity of airports and herewith provided 6 more flight operation procedures other than those 3 currently in service at Incheon International Airport.