• Title/Summary/Keyword: 소형 항공기

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The Nonlinear State Estimation of the Aircraft using the Adaptive Extended Kalman Filter (적응형 확장 칼만 필터를 이용한 항공기의 비선형 상태추정)

  • Jong Chul Kim;Sang Jong Lee;Anatol A. Tunik
    • Journal of Institute of Control, Robotics and Systems
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    • v.5 no.2
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    • pp.158-165
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    • 1999
  • 비행시험을 통해 획득한 데이터의 해석과정에서 대상 항공기의 크기가 소형인 경우에는 엔진진동이나 외부의 교란에 의한 잡음이나 바이어스 등의 강도가 높기 때문에 데이터의 처리과정에서 많은 문제점을 산출하게 된다. 이와 같은 문제점을 해결하기 위해 상태추정 알고리즘이 사용되며, 본 논문에서는 항공기의 비선형 세로운동 방정식의 경우에 확장형 칼만 필터를 적용하여 항공기 세로운동의 상태변수들을 추정하였으며, 또한 확률근사과정, 이노베이션에 대한 궤환 적응 등 적응형 칼만 필터를 사용하여 수렴속도와 정확도 둥을 향상시킨 알고리즘을 제안하고 그 결과를 나타내었다.

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Aircraft Digital Fly-By-Wire System Technology Development Trend (항공기 디지털 전자식 비행제어 시스템 기술 개발 동향)

  • Seong-Byeong Chae
    • The Journal of the Korea institute of electronic communication sciences
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    • v.18 no.3
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    • pp.509-520
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    • 2023
  • In this paper, the structure and the characteristics of the Fly-By-Wire system applied to the civil aircraft was described. The development trend of the redundant method of the flight control system, data communication system, control surface actuation system and the control laws implemented by the Fly-By-Wire system of the civil aircraft are discussed. The Fly-By-Wire system was first applied to the fighter and its inherent advantages lead to the advent of the Fly-By-Wire civil aircraft. Recently even the small jet aircraft shows the trend of adopting the Fly-By-Wire system. In the future, most of the aircraft are expected to be the Fly-By-Wire type.

Method to Extract Coastline Changes Using Unmanned Aerial Vehicle (무인항공기를 이용한 해안선 변화 추출에 관한 연구)

  • Lee, Kangsan;Choi, Jinmu;Joh, Chang-Hyeon
    • Journal of the Korean Geographical Society
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    • v.50 no.5
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    • pp.473-483
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    • 2015
  • In a coastal area, a plenty of research has adopted remotely sensed data. This is because longterm interaction between land and ocean makes continuous geographical changes in a broad extent and unaccessible areas. However, conventional remote sensing platforms such as satellite or airplane has several disadvantages including limited temporal resolution and high operational costs. Hence, this study uses a UAV system to detect a coastline and its movement. Result of coastline detection shows how the coastline moves in a day. Time-series coastlines were derived from UAV aerial images through digital image processing. There is a drawback in the stability of UAV compared to the conventional remote sensing platform, but the advantage appears on the economical efficiency. Since the latest studies shows an improvement of UAV for a variety of purposes in many fields, a UAV can also be utilized for regional study and spatial data acquisition platform. geography can also utilize a UAV as a spatial data acquisition platform for regional study.

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A Comparison of Control Methods for Small UAV Considering Ice Accumulation and Uncertainty (결빙 현상과 불확실성을 고려한 소형 무인항공기 제어기법 비교 연구)

  • Hyodeuk An;Jungho Moon
    • Journal of Aerospace System Engineering
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    • v.17 no.5
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    • pp.34-41
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    • 2023
  • This paper applies the icing effect and wing rock uncertainty to small unmanned aerial vehicles (UAVs), which have recently attracted attention. Attitude control simulations were performed using various control methods. First, the selected platform, the Skywalker X8 UAV with blended wing-body (BWB) configuration, was linearized for both its baseline form, and a form with applied icing effects. Subsequently, using MATLAB SimulinkⓇ, simulations were conducted for roll and pitch attitude control of the baseline configuration and the configuration with icing effects, employing disturbance observer-based PID control, model reference adaptive control, and model predictive control. Furthermore, the study introduced wing rock uncertainty simultaneously with icing effects on the configured model-a combination not previously explored in existing research-and conducted simulations. The performance of each control Method was compared and analyzed.

System Identification of a Small Unmanned Air Vehicle Using Neural Networks (신경회로망을 이용한 소형 무인항공기 시스템 식별)

  • Song, Yong-Kyu;Jeon, Byung-Ho
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.35 no.10
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    • pp.912-917
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    • 2007
  • In this paper system identification of a small UAV via neural networks is tried and the estimated parameters are then compared to those obtained by Fourier Transform Regression and Maximum Likelihood Estimation Techniques. With the estimated parameters a linear system is constructed and simulated to compare to the flight data. The results show that parameter identification using neural networks is comparable to the existing techniques

Thermal Analysis Considering Aircraft Flight Pattern of High-Power Electric Motor for Small Aircraft Propulsion (고출력 소형 항공기 추진용 전동기의 항공 운항 패턴을 고려한 열 특성 분석)

  • Kim, Yong-Tae;Lee, Jin-Gyu;Ha, Jae-Pyeong;Jung, Yeon-Hwan;Hur, Yoon
    • Proceedings of the KIEE Conference
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    • 2015.07a
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    • pp.888-889
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    • 2015
  • 세계적으로 석유 연료를 대체할 에너지원인 전기에너지에 대한 관심이 높아지고 있고, 전기자동차 뿐만 아니라 항공기에 사용할 고출력 전동기에 관한 연구 및 개발이 진행되고 있다. 고출력 밀도를 갖는 전동기의 경우 방열설계가 잘되어 있지 않으면, 발열로 인한 전동기의 성능과 내구성 및 수명이 단축되게 된다. 본 논문에서는 소형 항공기의 이륙, 상승, 순항구간에 요구되는 출력특성을 만족하도록 설계된 전동기에 대해, 항공 운항 Mission Profile의 출력 및 시간변동에 따른 온도 특성을 분석해 보았다.

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