• Title/Summary/Keyword: aircraft measurement

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Precision Measurement for Aircraft Alignment using Industrial Photogrammetry (산업사진측량을 이용한 항공기 얼라인먼트 정밀측정)

  • Jung, Sung-Heuk;Lee, Jae-Kee
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.33 no.6
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    • pp.57-63
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    • 2005
  • According to increasing of demand for high accurate and quick measuring technology, they became to interest in industrial photogrammetry that can satisfy with this needs. This study is examined O-2A aircraft to check the application of Industrial Photogrammetry technology. To measure the aircraft alignment, the check points marked on it were used without exact aircraft design data. And to check any deformation of its external original feature, Pro-spot system has been used.

Real-time Aircraft Upset Detection and Prevention Based On Extended Kalman Filter (확장칼만필터를 이용한 항공기 비정상 비행상황 판단 및 방지를 위한 실시간 대처법 연구)

  • Woo, Beomki;Park, On;Kim, Seungkeun;Suk, Jinyoung;Kim, Youdan
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.45 no.9
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    • pp.724-733
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    • 2017
  • Accidents caused by upset condition leads to fatal damage to both manned and unmanned aircraft. This paper deals with real-time detection of these aircraft upset situations to prevent further severe situations. Firstly, the difference between sensor measurement and predicted measurement from Extended Kalman filter is monitored to determine whether a target aircraft goes into an upset condition or not. In addition, repeating the time update stage of the Extended Kalman filter for a specific length of time can enable future upset situation prediction. The results of aforementioned both the approaches will build a bridge to upset prevention for future generation of manned/unmanned aircraft.

Estimation on the Interior and Outside Aircraft Noise Level of Residential House (주거용 건물의 실내.외 항공기소음레벨 평가)

  • Bang, Min;Kim, Do-Heong;Kim, Heung-Sik;Cho, Chang-Geun
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2007.11a
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    • pp.687-691
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    • 2007
  • It is important to increase the sound proof performance of building for reducing the influence of aircraft noise on the bais of actual survey of existed buildings. The purpose of this study is to propose the basic data for designing sound insulation of residential house. In this study, field measurement of aircraft noise Interior and outside noise level difference were carried out for 7 days in 2 residential houses. As the result, aircraft noise levels showed to be Leq $71.8{\sim}74.5$dB(A), WECPNL $82.2{\sim}83.4$ and indoor noise level were NC-55 ${\sim}63$ over acceptable NC-30 in 2 measured houses. Noise reduction effect showed to be $15.8{\sim}23.1$dB(A) in measured houses, and houses with double window were preferable to those with single window in sound proof performance. The outside sound pressure level for residential house was a little different according to the type of source. In measuring by using aircraft noise it was effected by angle and distance from measuring point, to aircraft, window area, and sound absorption of room, and so on.

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Comparison of community annoyance from commercial and military aircraft noise (민간항공기와 군용항공기 소음에 의한 성가심 반응 비교)

  • Lee, Soo-Gab;Kim, Kyu-Tae;Kim, Jae-Hwan;Hong, Ji-Young;Lim, Chang-Woo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2007.11a
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    • pp.425-429
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    • 2007
  • The noise problem has been a public interest for several years in Korea. Especially, the noises which were emitted from aircrafts on the airport and in the air have injurious effects on people over a vast range. Hence, there need vast data on the aircraft noise to evaluate the effect of various parameters. In present study, the works which consist of social surveys and noise measurements were conducted at points near the airport and the airbase. Total of 1,784 participants give effective responses in forty-five areas nearby the measurement points. Questionnaires asked the responses concerned with attitude, noise sensitivity, directive effects, secondary effects, annoyance and attempts to lower noise level exposed. From the field survey, the doseresponse relationship of community response to aircraft noise was established and there are different characteristics between civil and military aircraft. Though the study is still continuing on a few interest, one among some results is that %HA (%highly annoyed) of civil aircraft is higher than military's under the 70 WECPNL.

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항공기 개발사업을 위한 기술성과측정방법 연구

  • Han, Chang-Hwan;Choi, Seok;Kim, Seung-Bum
    • Aerospace Engineering and Technology
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    • v.4 no.2
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    • pp.42-49
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    • 2005
  • Technical performance measurement (TPM) has been in widespread use for many years and is recognized as a highly useful method that can identify deficiencies in meeting aircraft system requirements, provide early warning of program problems, and be used to monitor technical risks. This paper presents the overview of technical performance measurement method and its application in aircraft system development for KHP, KTX etc.

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An Experimental Study on Selecting the Diameter of Probe Stylus of a Coordinate Measuring Machine in Measuring the Edge Profile of High Pressure Compressor (압축기 블레이드의 Edge 형상 측정시 3차원 측정기의 탐침 볼 직경 선정을 위한 실험적 연구)

  • Joung, Soo-Ho;Byun, Jai-Hyun
    • IE interfaces
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    • v.15 no.4
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    • pp.432-438
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    • 2002
  • When the trailing edge and leading edge of an airfoil contour of high pressure compressor blades are measured, there exists a measurement error due to the size of the probe stylus ball diameter. In the paper an experimental study is provided to determine the optimum diameter of the probe stylus in inspecting the airfoil of the high pressure compressor blade. The measurement and analysis procedure suggested in this paper will be helpful to those who are involved in measuring and inspecting various types of blades.

Target State Estimator Design Using FIR filter and Smoother

  • Kim, Jae-Hun;Joon Lyou
    • Transactions on Control, Automation and Systems Engineering
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    • v.4 no.4
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    • pp.305-310
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    • 2002
  • The measured rate of the tracking sensor becomes biased under some operational situation. For a highly maneuverable aircraft in 3D space, the target dynamics changes from time to time, and the Kalman filter using position measurement only can not be used effectively to reject the rate measurement bias error. To cope with this problem, we present a new algorithm which incorporate FIR-type filter and FIR-type fixed-lag smoother, and demonstrate that it has the optimal performance in terms of both estimation accuracy and response time through an application example to the anti-aircraft gun fire control system(AAGFCS).

Study on the Tx/Rx Beam Performance of Planar Active Phased Array Antenna for Airborne as using the Near-field Measurement (근접전계 시험을 이용한 항공기용 평면형 능동 위상 배열 안테나 송수신 빔 성능 검증에 관한 연구)

  • Kim, Young-Wan;Lee, Jaemin;Lee, Yuri;Kim, JongPhil;Park, Jong-Kuk;Park, Kyuchul;Kim, Sunju
    • Journal of the Korea Institute of Military Science and Technology
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    • v.21 no.1
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    • pp.61-68
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    • 2018
  • In this paper, we described about methods and results to verify the Tx/Rx beam characteristics of a planar active phased array antenna as using a near-field measurement. The near-field system can effectively measure multiple beams and predict the performance degradation due to the partial failure of individual elements. Also, it can accurately predict the EIRP relating to detection performance of the active phased array radar. We briefly described the near-field measurement method to verify the Tx/Rx beam characteristics, and then verified the effectiveness of measurement method by analyzing the measured results.

Time Delay Error Analysis and Compensation Method of Integrated Navigation System for Aircraft Store (항공장착물의 전달정렬을 위한 통합항법장치 시간 지연 오차 분석 및 보상 기법)

  • Seo, Byung-Il
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.46 no.7
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    • pp.592-601
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    • 2018
  • The GPS/INS integrated navigation system, which is one of the electronic equipments mounted on military aircraft store, can not directly receive GPS signals by the aircraft wing before the drop, so GPS navigation data is received from the aircraft and used for filter integration, afterwards, the integrated navigation is performed using the GPS information directly received through the antenna. In this case, it is possible to operate the mount in old aircraft without any modification of the aircraft when GPS data is transmitted using wireless. However, the delay occurs while the aircraft navigation data is transmitted to the integrated navigation filter of the aircraft store via wireless, which affects the time synchronization of the GPS measurement and the INS information, affecting the integrated navigation performance. In this paper, an algorithm to analyze and compensate the effect of generation and transmission delay that can occur when implementing GPS/INS integrated navigation system of aircraft store that receives GPS data via wireless.