Optimizing control of a compound rotorcraft in quasi-steady maneuvers

Adam T. Thorsen, Joseph Francis Horn, Gurbuz T. Ozdemir

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)

Abstract

This study investigates control allocation for a compound rotorcraft to optimize performance in acceleration, pull-up, and turning maneuvers. Simulations of a hypothetical compound rotorcraft based on a UH-60A airframe and main rotor with a wing and pusher propeller are used. The study presents general background on the simulated compound rotorcraft's performance in trim and the trim methodology employed. In addition to the four traditional controls, this study explores two additional control effectors: propeller pitch and symmetric wing flap deflection, which can be optimized for performance in trim or maneuvering flight. Trim analysis of quasi-steady maneuvers is used to gain an understanding of the control allocation that minimizes power required. The results of the optimization are incorporated into a g-command model inversion controller to regulate longitudinal and vertical load factor. A combined longitudinal and vertical load factor command controller is used to ensure optimal control allocation with regards to the propulsive force distribution between the main rotor and propeller, and the lift force distribution between the main rotor and wing.

Original languageEnglish (US)
Title of host publicationAmerican Helicopter Society International - 5th Decennial AHS Aeromechanics Specialists' Conference 2014
Subtitle of host publicationCurrent Challenges and Future Directions in Rotorcraft Aeromechanics
PublisherAmerican Helicopter Society International
Pages434-449
Number of pages16
ISBN (Electronic)9781634391788
StatePublished - Jan 1 2014
Event5th Decennial AHS Aeromechanics Specialists' Conference 2014: Current Challenges and Future Directions in Rotorcraft Aeromechanics - San Francisco, United States
Duration: Jan 22 2014Jan 24 2014

Publication series

NameAmerican Helicopter Society International - 5th Decennial AHS Aeromechanics Specialists' Conference 2014: Current Challenges and Future Directions in Rotorcraft Aeromechanics

Other

Other5th Decennial AHS Aeromechanics Specialists' Conference 2014: Current Challenges and Future Directions in Rotorcraft Aeromechanics
CountryUnited States
CitySan Francisco
Period1/22/141/24/14

Fingerprint

Propellers
Rotors
Controllers
Airframes

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering

Cite this

Thorsen, A. T., Horn, J. F., & Ozdemir, G. T. (2014). Optimizing control of a compound rotorcraft in quasi-steady maneuvers. In American Helicopter Society International - 5th Decennial AHS Aeromechanics Specialists' Conference 2014: Current Challenges and Future Directions in Rotorcraft Aeromechanics (pp. 434-449). (American Helicopter Society International - 5th Decennial AHS Aeromechanics Specialists' Conference 2014: Current Challenges and Future Directions in Rotorcraft Aeromechanics). American Helicopter Society International.
Thorsen, Adam T. ; Horn, Joseph Francis ; Ozdemir, Gurbuz T. / Optimizing control of a compound rotorcraft in quasi-steady maneuvers. American Helicopter Society International - 5th Decennial AHS Aeromechanics Specialists' Conference 2014: Current Challenges and Future Directions in Rotorcraft Aeromechanics. American Helicopter Society International, 2014. pp. 434-449 (American Helicopter Society International - 5th Decennial AHS Aeromechanics Specialists' Conference 2014: Current Challenges and Future Directions in Rotorcraft Aeromechanics).
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abstract = "This study investigates control allocation for a compound rotorcraft to optimize performance in acceleration, pull-up, and turning maneuvers. Simulations of a hypothetical compound rotorcraft based on a UH-60A airframe and main rotor with a wing and pusher propeller are used. The study presents general background on the simulated compound rotorcraft's performance in trim and the trim methodology employed. In addition to the four traditional controls, this study explores two additional control effectors: propeller pitch and symmetric wing flap deflection, which can be optimized for performance in trim or maneuvering flight. Trim analysis of quasi-steady maneuvers is used to gain an understanding of the control allocation that minimizes power required. The results of the optimization are incorporated into a g-command model inversion controller to regulate longitudinal and vertical load factor. A combined longitudinal and vertical load factor command controller is used to ensure optimal control allocation with regards to the propulsive force distribution between the main rotor and propeller, and the lift force distribution between the main rotor and wing.",
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Thorsen, AT, Horn, JF & Ozdemir, GT 2014, Optimizing control of a compound rotorcraft in quasi-steady maneuvers. in American Helicopter Society International - 5th Decennial AHS Aeromechanics Specialists' Conference 2014: Current Challenges and Future Directions in Rotorcraft Aeromechanics. American Helicopter Society International - 5th Decennial AHS Aeromechanics Specialists' Conference 2014: Current Challenges and Future Directions in Rotorcraft Aeromechanics, American Helicopter Society International, pp. 434-449, 5th Decennial AHS Aeromechanics Specialists' Conference 2014: Current Challenges and Future Directions in Rotorcraft Aeromechanics, San Francisco, United States, 1/22/14.

Optimizing control of a compound rotorcraft in quasi-steady maneuvers. / Thorsen, Adam T.; Horn, Joseph Francis; Ozdemir, Gurbuz T.

American Helicopter Society International - 5th Decennial AHS Aeromechanics Specialists' Conference 2014: Current Challenges and Future Directions in Rotorcraft Aeromechanics. American Helicopter Society International, 2014. p. 434-449 (American Helicopter Society International - 5th Decennial AHS Aeromechanics Specialists' Conference 2014: Current Challenges and Future Directions in Rotorcraft Aeromechanics).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Thorsen AT, Horn JF, Ozdemir GT. Optimizing control of a compound rotorcraft in quasi-steady maneuvers. In American Helicopter Society International - 5th Decennial AHS Aeromechanics Specialists' Conference 2014: Current Challenges and Future Directions in Rotorcraft Aeromechanics. American Helicopter Society International. 2014. p. 434-449. (American Helicopter Society International - 5th Decennial AHS Aeromechanics Specialists' Conference 2014: Current Challenges and Future Directions in Rotorcraft Aeromechanics).