Detection and Avoidance of Main Rotor Hub Moment Limits on Rotorcraft

Joseph Francis Horn, Nilesh Sahani

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

There is interest in developing carefree maneuvering capability on future rotorcraft. This has driven the need for advanced algorithms that predict the onset of structural limits and cue the pilot using tactile feedback. A new method is presented for the detection and avoidance of static load limits on the main rotor hub. An algorithm was developed that uses linear models to estimate constraints on longitudinal and lateral cyclic stick positions that ensure the transient response of hub moments remain bounded within prescribed limits. The system was tested using a high-fidelity nonlinear simulation of a UH-60A helicopter (GENHEL). The system was shown to be successful in simultaneously constraining stick travel in both lateral and longitudinal axes to prevent hub moment limit violations. The most critical conditions occurred during control reversals, at which point the system effectively imposed rate limits on the stick motion. The algorithm was shown to be robust to changes in aircraft weight and e.g. location.

Original languageEnglish (US)
Pages (from-to)372-379
Number of pages8
JournalJournal of Aircraft
Volume41
Issue number2
DOIs
StatePublished - Jan 1 2004

Fingerprint

Rotors
Load limits
Helicopters
Transient analysis
Aircraft
Feedback

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering

Cite this

@article{17efd20b99aa423ca69f346cf90bac03,
title = "Detection and Avoidance of Main Rotor Hub Moment Limits on Rotorcraft",
abstract = "There is interest in developing carefree maneuvering capability on future rotorcraft. This has driven the need for advanced algorithms that predict the onset of structural limits and cue the pilot using tactile feedback. A new method is presented for the detection and avoidance of static load limits on the main rotor hub. An algorithm was developed that uses linear models to estimate constraints on longitudinal and lateral cyclic stick positions that ensure the transient response of hub moments remain bounded within prescribed limits. The system was tested using a high-fidelity nonlinear simulation of a UH-60A helicopter (GENHEL). The system was shown to be successful in simultaneously constraining stick travel in both lateral and longitudinal axes to prevent hub moment limit violations. The most critical conditions occurred during control reversals, at which point the system effectively imposed rate limits on the stick motion. The algorithm was shown to be robust to changes in aircraft weight and e.g. location.",
author = "Horn, {Joseph Francis} and Nilesh Sahani",
year = "2004",
month = "1",
day = "1",
doi = "10.2514/1.301",
language = "English (US)",
volume = "41",
pages = "372--379",
journal = "Journal of Aircraft",
issn = "0021-8669",
publisher = "American Institute of Aeronautics and Astronautics Inc. (AIAA)",
number = "2",

}

Detection and Avoidance of Main Rotor Hub Moment Limits on Rotorcraft. / Horn, Joseph Francis; Sahani, Nilesh.

In: Journal of Aircraft, Vol. 41, No. 2, 01.01.2004, p. 372-379.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Detection and Avoidance of Main Rotor Hub Moment Limits on Rotorcraft

AU - Horn, Joseph Francis

AU - Sahani, Nilesh

PY - 2004/1/1

Y1 - 2004/1/1

N2 - There is interest in developing carefree maneuvering capability on future rotorcraft. This has driven the need for advanced algorithms that predict the onset of structural limits and cue the pilot using tactile feedback. A new method is presented for the detection and avoidance of static load limits on the main rotor hub. An algorithm was developed that uses linear models to estimate constraints on longitudinal and lateral cyclic stick positions that ensure the transient response of hub moments remain bounded within prescribed limits. The system was tested using a high-fidelity nonlinear simulation of a UH-60A helicopter (GENHEL). The system was shown to be successful in simultaneously constraining stick travel in both lateral and longitudinal axes to prevent hub moment limit violations. The most critical conditions occurred during control reversals, at which point the system effectively imposed rate limits on the stick motion. The algorithm was shown to be robust to changes in aircraft weight and e.g. location.

AB - There is interest in developing carefree maneuvering capability on future rotorcraft. This has driven the need for advanced algorithms that predict the onset of structural limits and cue the pilot using tactile feedback. A new method is presented for the detection and avoidance of static load limits on the main rotor hub. An algorithm was developed that uses linear models to estimate constraints on longitudinal and lateral cyclic stick positions that ensure the transient response of hub moments remain bounded within prescribed limits. The system was tested using a high-fidelity nonlinear simulation of a UH-60A helicopter (GENHEL). The system was shown to be successful in simultaneously constraining stick travel in both lateral and longitudinal axes to prevent hub moment limit violations. The most critical conditions occurred during control reversals, at which point the system effectively imposed rate limits on the stick motion. The algorithm was shown to be robust to changes in aircraft weight and e.g. location.

UR - http://www.scopus.com/inward/record.url?scp=2342568980&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=2342568980&partnerID=8YFLogxK

U2 - 10.2514/1.301

DO - 10.2514/1.301

M3 - Article

AN - SCOPUS:2342568980

VL - 41

SP - 372

EP - 379

JO - Journal of Aircraft

JF - Journal of Aircraft

SN - 0021-8669

IS - 2

ER -