Detection and avoidance of main rotor hub moment limits on rotorcraft

Joseph Francis Horn, Nilesh Sahani

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

8 Citations (Scopus)

Abstract

Future rotorcraft will require systems that allow carefree maneuvering. This has driven the need for advanced algorithms that predict the onset of structural limits and cue the pilot using tactile feedback. This paper presents a new method for the detection and avoidance of the main rotor hub moment limit. The dynamic nature of the hub moment limit makes it a challenging problem. An algorithm was developed which uses linear models to estimate constraints on longitudinal and lateral cyclic stick positions that ensure the transient response of hub moments remains bounded within prescribed limits. The system was tested using a high-fidelity non-linear simulation of a UH-60A helicopter. The simulation was run using prescribed force inputs and a pilot model to simulate maneuvers. The system was shown to be quite successful in constraining stick travel in multiple axes to prevent hub moment limit violations. The algorithm appeared to be relatively robust and could operate in real-time with a 10 ms time frame. The most critical conditions occurred during control reversals, at which point the system effectively imposed rate limits on the stick motion.

Original languageEnglish (US)
Title of host publicationAIAA Atmospheric Flight Mechanics Conference and Exhibit
StatePublished - Dec 1 2001
EventAIAA Atmospheric Flight Mechanics Conference and Exhibit 2001 - Montreal, QC, Canada
Duration: Aug 6 2001Aug 9 2001

Publication series

NameAIAA Atmospheric Flight Mechanics Conference and Exhibit

Other

OtherAIAA Atmospheric Flight Mechanics Conference and Exhibit 2001
CountryCanada
CityMontreal, QC
Period8/6/018/9/01

Fingerprint

Rotors
Helicopters
Transient analysis
Feedback

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Mechanical Engineering
  • Computer Science Applications
  • Energy Engineering and Power Technology

Cite this

Horn, J. F., & Sahani, N. (2001). Detection and avoidance of main rotor hub moment limits on rotorcraft. In AIAA Atmospheric Flight Mechanics Conference and Exhibit (AIAA Atmospheric Flight Mechanics Conference and Exhibit).
Horn, Joseph Francis ; Sahani, Nilesh. / Detection and avoidance of main rotor hub moment limits on rotorcraft. AIAA Atmospheric Flight Mechanics Conference and Exhibit. 2001. (AIAA Atmospheric Flight Mechanics Conference and Exhibit).
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title = "Detection and avoidance of main rotor hub moment limits on rotorcraft",
abstract = "Future rotorcraft will require systems that allow carefree maneuvering. This has driven the need for advanced algorithms that predict the onset of structural limits and cue the pilot using tactile feedback. This paper presents a new method for the detection and avoidance of the main rotor hub moment limit. The dynamic nature of the hub moment limit makes it a challenging problem. An algorithm was developed which uses linear models to estimate constraints on longitudinal and lateral cyclic stick positions that ensure the transient response of hub moments remains bounded within prescribed limits. The system was tested using a high-fidelity non-linear simulation of a UH-60A helicopter. The simulation was run using prescribed force inputs and a pilot model to simulate maneuvers. The system was shown to be quite successful in constraining stick travel in multiple axes to prevent hub moment limit violations. The algorithm appeared to be relatively robust and could operate in real-time with a 10 ms time frame. The most critical conditions occurred during control reversals, at which point the system effectively imposed rate limits on the stick motion.",
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Horn, JF & Sahani, N 2001, Detection and avoidance of main rotor hub moment limits on rotorcraft. in AIAA Atmospheric Flight Mechanics Conference and Exhibit. AIAA Atmospheric Flight Mechanics Conference and Exhibit, AIAA Atmospheric Flight Mechanics Conference and Exhibit 2001, Montreal, QC, Canada, 8/6/01.

Detection and avoidance of main rotor hub moment limits on rotorcraft. / Horn, Joseph Francis; Sahani, Nilesh.

AIAA Atmospheric Flight Mechanics Conference and Exhibit. 2001. (AIAA Atmospheric Flight Mechanics Conference and Exhibit).

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

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Horn JF, Sahani N. Detection and avoidance of main rotor hub moment limits on rotorcraft. In AIAA Atmospheric Flight Mechanics Conference and Exhibit. 2001. (AIAA Atmospheric Flight Mechanics Conference and Exhibit).