• Title/Summary/Keyword: 활공비행체

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Research and Development Trends of a Hypersonic Glide Vehicle (HGV) (극초음속 활공 비행체(HGV)의 연구개발 동향)

  • Hwang, Ki-Young;Huh, Hwanil
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.48 no.9
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    • pp.731-743
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    • 2020
  • The hypersonic glide vehicle ascends to a high altitude by a rocket booster, separates it from the booster, and glides at a hypersonic speed of Mach 5 or higher at an altitude of about 30~70 km, changing its direction in the atmosphere. Since it moves on an unpredictable flight path rather than a parabolic trajectory, it is difficult to intercept with current missile defense systems. The U.S. conducted HTV-2 and AHW flight tests in the early 2010s to confirm the possibility of hypersonic gliding flights, and recently it has been developing hypersonic glide vehicle systems such as LRHW and ARRW. China has conducted several flight tests of the DF-ZF (WU-14) glide vehicle since 2014 and has been operating it with DF-17 missiles. Russia has conducted hypersonic glide vehicle research since the former Soviet Union, but it has repeatedly failed, and recently it has been successfully tested with the Avangard (Yu-71) glide vehicle mounted on the SS-19 ICBM. In this paper, the characteristics, flight test cases, and development trends of hypersonic glide vehicles developed or currently being developed in the United States, China, Russia, Japan, India, and Europe are reviewed and summarized.

Dynamic Soaring Optimal Path Following with Time-variant Horizontal Wind Model (시변 수평풍 모델을 적용한 동적 활공 최적 궤적 추종)

  • Park, SeungWoo;Han, SeungWoo;Kim, Linkeun;Ko, Sangho
    • Journal of Aerospace System Engineering
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    • v.15 no.5
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    • pp.72-80
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    • 2021
  • Albatross uses dynamic soaring technique to obtain energy from horizontal winds and fly long distances without flapping. These dynamic soaring technique can be applied to manned/unmanned aircraft to reduce the components required for the aircraft and achieve light weight and small volume to effectively perform a given task. In this paper, to simulate the dynamic soaring technique of Albatross, we defined the optimization problem and set each boundary condition to derive the optimal flight trajectory and carry out simulations to follow it. In particular, to model dynamic soaring simulations more closely with reality, we proposed a horizontal wind model that changes every moment. This identifies and analyzes the effect of the time-variable horizontal wind model on the dynamic soaring mission of unmanned aircraft.

Impact Analysis on Water Entry of Gliding Vehicle using Finite Element Method (유한요소 해석을 통한 활공비행체의 입수충격해석)

  • Kim, Changyu;Hwang, Youngeun
    • Journal of the Korea Institute of Military Science and Technology
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    • v.20 no.4
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    • pp.467-473
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    • 2017
  • In this paper, impact characteristics of a water entry gliding vehicle were analyzed using a finite element method. To guarantee the validity of analysis results, a convergence test was performed for several ratios of Euler and Largrange mesh sizes. The impact coefficient was calculated with respect to entry angles and angle of attacks. It can be observed that the impact coefficient was large at a high cross-section gradient and was also affected by cavitation. This study could be useful in the preliminary design stage of a water entry bomb development.

Fluid-Structure Interaction Analysis of High Aspect Ratio Wing for the Prediction of Aero-elasticity (유체-구조 연계 해석기법을 이용한 세장비가 큰 비행체 날개의 공탄성 해석)

  • Lee, Ki-Du;Lee, Young-Shin;Lee, Dae-Yearl;Lee, In-Won
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.38 no.6
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    • pp.547-556
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    • 2010
  • For the safety of aircraft and accuracy of bombs, many companies have researched the new concept of adaptive kit to flying-bombs. For the long distance flying, it's normally used deployed high-aspect ratio wing because of limited volume. The probabilities of large elastic deformation and flutter are increased due to decreased stiffness of high-aspect ratio wing. In this paper, computational fluid dynamics and computational structure dynamics interaction methodology are applied for prediction of aerodynamic characteristics. FLUENT and ABAQUS are used to calculate fluid and structural dynamics. Code-bridge was made base on the compactly supported radial basis function to execute interpolation and mapping. There are some differences between rigid body and fluid-structure interaction analysis which are results of aerodynamics characteristics due to structural deformation. Small successive vibration was observed by interaction.

A Study on the Interception using Fine Fragments and Particles to Hypersonic Vehicles (미세파편 및 입자를 활용한 극초음속 비행체 요격 연구)

  • Insoo Kim;Bongjoo Kang;Seongpyo Kim;Jongwon Yoon;Sunghoon Kim
    • Journal of the Korea Institute of Military Science and Technology
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    • v.27 no.2
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    • pp.285-293
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    • 2024
  • This paper describes the interception using fine fragments and particles to hypersonic vehicles which have a vulnerability in thermal and pressure during glide-phase flight. This interception concept is based on the fast relative velocity and the flight vulnerability of hypersonic vehicles. For the density calculation of fragmentation and particle in interception, error analysis of end-phase was performed including radar, intercept missile and target maneuvering errors. In relation to the vulnerability and error analysis, the penetration characteristics of fine fragments in high temperature were analyzed. Presented the interception in glide-phase could be applied to the concept of horizontal multi-layer defense to hypersonic vehicles.

The Prediction of Aeroelasticity of F-5 Aircraft's Horizontal Tail with Various Shape of External Stores (외부 장착물 형상에 따른 F-5 항공기 수평미익의 공탄성 특성 예측)

  • Lee, Ki-Du;Lee, Young-Shin;Lee, Dae-Yearl;Kim, In-Woo;Lee, In-Won
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.39 no.9
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    • pp.823-831
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    • 2011
  • According to the development of loading equipments, it is usual to change or replace the existing stores. It has been known that pylon-mounted under stores strongly affect aircraft dynamics characteristics due to the change of aerodynamics. To predict the aerodynamics and aero-elasticity is essentially requested with considering the configuration and shape of external stores during the development of aircraft and/or external stores. In this paper, computational fluid dynamics and computational structure dynamics interaction methodology are applied for prediction of aerodynamic characteristics for F-5 aircraft's horizontal tail with various shape of external stores. FLUENT and ABAQUS were used to calculate fluid and structural dynamics. Code-bridge was made base on the globally supported radial basis function to execute interpolation and mapping. As a result, even though the aeroelasticity of the horizontal tail slightly changes according to the shape of external store, the flutter was not occurred at the considered flight conditions in this study.

A Study on the Defense System of the Hypersonic Missile Systems (극초음속 미사일 대응을 위한 방어체계에 관한 연구)

  • Lee, Kyoung-haing
    • Journal of Aerospace System Engineering
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    • v.16 no.5
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    • pp.43-48
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    • 2022
  • The Kinzal missile launched by Russia in Ukraine and flew on March 5 or more speeds is the first hypersonic cruise missile used in combat. High speed leads to destructive solid power, and the security system's interception time is significantly reduced. Therefore, hypersonic missiles could be a game-changer. Even the United States, with its multi-layered defense system, admits the difficulty of intercepting it. Military powers like the United States, Russia, China and North Korea are focus on developing hypersonic missiles as offensive weapons, but their defense system capabilities are inadeqate. From this perspective, this paper identifies significant countrie's hypersonic missile development status and defense system capabilities and seeks to derive a countermeasure for the ROK military.

Performance Analysis of an Electric Powered Small Unmanned Aerial Vehicle (전기동력 소형무인항공기의 성능분석)

  • Lee, Chang-Ho;Kim, Sung-Yug;Kim, Dong-Min
    • Journal of the Korean Society of Propulsion Engineers
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    • v.14 no.4
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    • pp.65-70
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    • 2010
  • A small unmanned aerial vehicle(UAV), which uses a propulsion system consisting of electric motor and battery, weighs less than 8 kg, capable of hand launch. Because it is easy to operate and able to transmit image information in real time, the use of small UAV has been increasing. However, very few analysis methods or analysis results on flight performance of the small UAV have been known so far. In this paper, the performance analysis methods of a small UAV, which is manufactured to study an electric powered UAV, are suggested and their results are achieved. Aerodynamic data of the vehicle are obtained by making use of gliding performance from actual flight test, and required thrust and required power by flight speed are predicted. In addition, the methods to predict range and endurance in case of using battery as power source are suggested and their results are achieved.

Optimization of Glide Performance using Wind Estimator for Unpowerd Air Vehicle without Pitot-Tube (바람센서가 없는 무추력 비행체의 활공 시 대기속도 추정을 통한 유도성능 향상)

  • Kim, Boo-Min;Jin, Jae-Hyun;Park, Jeong-Ho;Kim, Byoung-Soo
    • Journal of Institute of Control, Robotics and Systems
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    • v.15 no.1
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    • pp.1-7
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    • 2009
  • As designing PID control on aircraft, we consider a gain scheduling on altitude and velocity. If pitot tube is not installed in the unpowered air vehicle, the control performance is reduced by the difference between ground speed and air speed with a wind considered. In this paper, a simple guidance controller (LOS: Line of Sight) and the wind estimator using Kalman filter are designed. And we minimize the wind effect through the estimator. Finally, we perform the 6-DOF nonlinear simulation with the wind model to verify the performance of the controller with the wind estimator.

A Study on Updating of Analytic Model of Dynamics for Aircraft Structures Using Optimization Technique (최적화 기법을 이용한 비행체 구조물 동특성 해석 모델의 최신화 연구)

  • Lee, Ki-Du;Lee, Young-Shin;Kim, Dong-Soo
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.37 no.2
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    • pp.131-138
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    • 2009
  • Analytical modal verification is considered as the process to provide an acceptable description of the subject structure's behaviour. In general, results of original analytical model are different with actual structure results to uncertainty like non-linearity of material, boundary and modified shape, etc. In this paper, the dynamic model of glider's wing is correlated with static deformation and vibration test results by goal-attainment method, multi-objects optimization technique. The structural responses are predicted by using finite element method and optimization is carried out by using the SQP(sequential quadratic programming) method which is widely used in the constrained nonlinear optimization problem. The MAC(Modal Assurance Criterion) is used to modify the mode shapes and quantify the similarity.