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The investigation on flight quality of tilt-rotor aircraft

Ke Lu (Science and Technology on Rotorcraft Aeromechanics Laboratory, China Helicopter Research and Development Institute , Jingdezhen, Jiangxi, China)
Shanyong Zhao (Science and Technology on Rotorcraft Aeromechanics Laboratory, China Helicopter Research and Development Institute , Jingdezhen, Jiangxi, China)
YUjie Ma (Science and Technology on Rotorcraft Aeromechanics Laboratory, China Helicopter Research and Development Institute , Jingdezhen, Jiangxi, China)
Shangjing Wu (Science and Technology on Rotorcraft Aeromechanics Laboratory, China Helicopter Research and Development Institute , Jingdezhen, Jiangxi, China)
Cheng da Su (Science and Technology on Rotorcraft Aeromechanics Laboratory, China Helicopter Research and Development Institute , Jingdezhen, Jiangxi, China)

Aircraft Engineering and Aerospace Technology

ISSN: 0002-2667

Article publication date: 6 September 2021

Issue publication date: 30 November 2021

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Abstract

Purpose

This paper aims to present an investigation on flight quality analysis and design of tilt-rotor aircraft combined with corresponding flight quality specifications.

Design/methodology/approach

From the perspective of modal characteristics of tilt-rotor aircraft, it focuses on the analysis of the change rules of the longitudinal short-term motion mode, lateral roll convergence mode, spiral mode and Dutch roll mode. Then, the flight quality design research is carried out using the explicit model tracking control method. The quantitative relationship between flight quality requirements and explicit model is established. Accordingly, the closed-loop flight quality of XV-15 tilt-rotor aircraft is evaluated.

Findings

The stability of spiral mode is the result of the interaction of various aerodynamic derivatives and spiral instability occurs in helicopter mode. The other motion modes are stable in full flight mode and meet the requirements of level 1 specified in ADS-33E-PRF and MIL-F-8785C flight quality specifications. There is a quantitative relationship between flight quality requirements and explicit model, and the flight quality of tilt-rotor aircraft is improved through the explicit model tracking control method.

Practical implications

The presented analysis results showed the influence of motion modes and flight quality and the effectiveness of explicit model tracking control method in flight quality improvement, which could be considered as new information for further flight quality design of tilt-rotor aircraft.

Originality/value

The originality of the paper lies in the proposed design and analysis method of the flight quality of tilt-rotor aircraft from the direction of the influence of its aerodynamic derivatives and motion modes.

Keywords

Acknowledgements

This work was supported by the Aeronautical Science Foundation of China (Grant Nos. 20185702003 and 201957002001).

Citation

Lu, K., Zhao, S., Ma, Y., Wu, S. and Su, C.d. (2021), "The investigation on flight quality of tilt-rotor aircraft", Aircraft Engineering and Aerospace Technology, Vol. 93 No. 10, pp. 1582-1590. https://doi.org/10.1108/AEAT-03-2021-0071

Publisher

:

Emerald Publishing Limited

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