Flight Path Reconstruction Techniques Applied to Spin Tests

Dias, Joaquim N.

doi:10.2514/6.2014-2559

Cited by 3 publications

(2 citation statements)

References 1 publication

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“…For context, the standard glide slope from an instrument landing system for passenger aircraft is three degrees. The airspeed shown in Table 1 for the spin manoeuvre is estimated from the combined ground and descent speeds, since at such large angles of attack and sideslip the dynamic pressure reading from pitot tubes become unreliable (14,15) ; in excess of 40° is reported in Ref. 15.…”

Section: Comparisonmentioning

confidence: 99%

“…The airspeed shown in Table 1 for the spin manoeuvre is estimated from the combined ground and descent speeds, since at such large angles of attack and sideslip the dynamic pressure reading from pitot tubes become unreliable (14,15) ; in excess of 40° is reported in Ref. 15. The airspeed measurement during the spin averaged at 7•6ms -1 but the ground speed was low (an average of 2•3ms -1 ), hence the actual airspeed must have been larger given the large descent rate.…”

Section: Comparisonmentioning

confidence: 99%

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Fixed-wing approach techniques for complex environments

Thomas¹,

Bullock

Bhandari³

et al. 2015

Aeronaut. j.

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The landing approach for fixed-wing small unmanned air vehicles (SUAVs) in complex environments such as urban canyons, wooded areas, or any other obscured terrain is challenging due to the limited distance available for conventional glide slope descents. Alternative approach methods, such as deep stall and spin techniques, are beneficial for such environments but are less conventional and would benefit from further qualitative and quantitative understanding to improve their implementation. Flight tests of such techniques, with a representative remotely piloted vehicle, have been carried out for this purpose and the results are presented in this paper. Trajectories and flight data for a range of approach techniques are presented and conclusions are drawn as to the potential benefits and issues of using such techniques for SUAV landings. In particular, the stability of the vehicle on entry to a deep stall was noticeably improved through the use of symmetric inboard flaps (crow brakes). Spiral descent profiles investigated, including spin descents, produced faster descent rates and further reduced landing space requirements. However, sufficient control authority was maintainable in a spiral stall descent, whereas it was compromised in a full spin.

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Section: Comparisonmentioning

confidence: 99%

Section: Comparisonmentioning

confidence: 99%

Fixed-wing approach techniques for complex environments

Thomas¹,

Bullock

Bhandari³

et al. 2015

Aeronaut. j.

View full text Add to dashboard Cite

show abstract

Data-compatibility Analysis Based on Expectation-Maximization Algorithm with Unknown Noise Statistics

Zuo

Qiu

Wang

2023

IEEE Trans. Aerosp. Electron. Syst.

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Recent Applications of System Identification Techniques at IPEV

Dias¹,

Silva²

2023

Journal of Aircraft

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This paper presents an overview of the system identification techniques developed and applied at the Flight Test and Research Institute during the last decade. System identification techniques have been used extensively to obtain aerodynamic models for a flight-test simulator, which was developed in house and specifically tailored for flight-test instruction and preparation for actual test flights. The methods applied were mostly the output error for data compatibility check and equation error in the time domain for model structure selection and parameter estimation. The most relevant applications are summarized in this paper, including identification of a high angle of attack model with compressibility effects for a jet trainer; estimation of drag polars at high subsonic regime for a jet fighter; identification of aerodynamic model in real-time for a propeller-driven fighter; application of flight-path reconstruction techniques to spin tests, in order to correct errors in the air data sensors; and identification of power effects on the longitudinal stability of a propeller-driven trainer. The examples show that system identification has become crucial to 1) obtain accurate aerodynamic models for training in the flight-test simulator and 2) develop more efficient flight-test techniques.

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Flight Path Reconstruction Techniques Applied to Spin Tests

Cited by 3 publications

References 1 publication

Fixed-wing approach techniques for complex environments

Fixed-wing approach techniques for complex environments

Data-compatibility Analysis Based on Expectation-Maximization Algorithm with Unknown Noise Statistics

Recent Applications of System Identification Techniques at IPEV

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