Implementation of a free-vortex wake model in real-time simulation of rotorcraft

Joseph Francis Horn, Derek O. Bridges, Daniel A. Wachspress, Sarma L. Rani

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

10 Citations (Scopus)

Abstract

Free-vortex wake models are capable of providing an accurate and physically detailed representation of the main rotor wake for flight dynamics simulation. Recent advances in computing power and efficient algorithms have made it feasible to use free wakes for real-time simulation. The CHARM free-vortex wake model was integrated with the GENHEL flight dynamics simulation of the UH-60A helicopter. A high fidelity wake model was defined by increasing the spatial and temporal resolution of the wake until a converged response was observed, but this baseline model could not execute in real-time. A parametric study was performed to find the best combination of wake parameters to achieve real-time execution with minimal deviation from the baseline model. Multiple variations in the wake properties were tested for execution framerate and their frequency and time responses in the pitch and roll axes were compared to those of the baseline model. A real-time model was selected and showed reasonable agreement with the baseline model as compared to a finite-state inflow model. The free wake models resulted in significantly different off-axis response and large amplitude response than the finite-state inflow model. A parallel implementation of the free wake model was also investigated. An increase in computational efficiency could be achieved using a distributed processing approach with asynchronous communications.

Original languageEnglish (US)
Title of host publication61st Annual Forum Proceedings - AHS International
Pages1093-1110
Number of pages18
StatePublished - Dec 1 2005
Event61st American Helicopter Society International Annual Forum 2005 - Grapevine, TX, United States
Duration: Jun 1 2005Jun 3 2005

Publication series

NameAnnual Forum Proceedings - AHS International
Volume2
ISSN (Print)1552-2938

Other

Other61st American Helicopter Society International Annual Forum 2005
CountryUnited States
CityGrapevine, TX
Period6/1/056/3/05

Fingerprint

Vortex flow
Flight dynamics
Computer simulation
Computational efficiency
Helicopters
Frequency response
Rotors
Communication
Processing

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Horn, J. F., Bridges, D. O., Wachspress, D. A., & Rani, S. L. (2005). Implementation of a free-vortex wake model in real-time simulation of rotorcraft. In 61st Annual Forum Proceedings - AHS International (pp. 1093-1110). (Annual Forum Proceedings - AHS International; Vol. 2).
Horn, Joseph Francis ; Bridges, Derek O. ; Wachspress, Daniel A. ; Rani, Sarma L. / Implementation of a free-vortex wake model in real-time simulation of rotorcraft. 61st Annual Forum Proceedings - AHS International. 2005. pp. 1093-1110 (Annual Forum Proceedings - AHS International).
@inproceedings{89849420310141e7b746389ea663a62d,
title = "Implementation of a free-vortex wake model in real-time simulation of rotorcraft",
abstract = "Free-vortex wake models are capable of providing an accurate and physically detailed representation of the main rotor wake for flight dynamics simulation. Recent advances in computing power and efficient algorithms have made it feasible to use free wakes for real-time simulation. The CHARM free-vortex wake model was integrated with the GENHEL flight dynamics simulation of the UH-60A helicopter. A high fidelity wake model was defined by increasing the spatial and temporal resolution of the wake until a converged response was observed, but this baseline model could not execute in real-time. A parametric study was performed to find the best combination of wake parameters to achieve real-time execution with minimal deviation from the baseline model. Multiple variations in the wake properties were tested for execution framerate and their frequency and time responses in the pitch and roll axes were compared to those of the baseline model. A real-time model was selected and showed reasonable agreement with the baseline model as compared to a finite-state inflow model. The free wake models resulted in significantly different off-axis response and large amplitude response than the finite-state inflow model. A parallel implementation of the free wake model was also investigated. An increase in computational efficiency could be achieved using a distributed processing approach with asynchronous communications.",
author = "Horn, {Joseph Francis} and Bridges, {Derek O.} and Wachspress, {Daniel A.} and Rani, {Sarma L.}",
year = "2005",
month = "12",
day = "1",
language = "English (US)",
isbn = "9781617829321",
series = "Annual Forum Proceedings - AHS International",
pages = "1093--1110",
booktitle = "61st Annual Forum Proceedings - AHS International",

}

Horn, JF, Bridges, DO, Wachspress, DA & Rani, SL 2005, Implementation of a free-vortex wake model in real-time simulation of rotorcraft. in 61st Annual Forum Proceedings - AHS International. Annual Forum Proceedings - AHS International, vol. 2, pp. 1093-1110, 61st American Helicopter Society International Annual Forum 2005, Grapevine, TX, United States, 6/1/05.

Implementation of a free-vortex wake model in real-time simulation of rotorcraft. / Horn, Joseph Francis; Bridges, Derek O.; Wachspress, Daniel A.; Rani, Sarma L.

61st Annual Forum Proceedings - AHS International. 2005. p. 1093-1110 (Annual Forum Proceedings - AHS International; Vol. 2).

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

TY - GEN

T1 - Implementation of a free-vortex wake model in real-time simulation of rotorcraft

AU - Horn, Joseph Francis

AU - Bridges, Derek O.

AU - Wachspress, Daniel A.

AU - Rani, Sarma L.

PY - 2005/12/1

Y1 - 2005/12/1

N2 - Free-vortex wake models are capable of providing an accurate and physically detailed representation of the main rotor wake for flight dynamics simulation. Recent advances in computing power and efficient algorithms have made it feasible to use free wakes for real-time simulation. The CHARM free-vortex wake model was integrated with the GENHEL flight dynamics simulation of the UH-60A helicopter. A high fidelity wake model was defined by increasing the spatial and temporal resolution of the wake until a converged response was observed, but this baseline model could not execute in real-time. A parametric study was performed to find the best combination of wake parameters to achieve real-time execution with minimal deviation from the baseline model. Multiple variations in the wake properties were tested for execution framerate and their frequency and time responses in the pitch and roll axes were compared to those of the baseline model. A real-time model was selected and showed reasonable agreement with the baseline model as compared to a finite-state inflow model. The free wake models resulted in significantly different off-axis response and large amplitude response than the finite-state inflow model. A parallel implementation of the free wake model was also investigated. An increase in computational efficiency could be achieved using a distributed processing approach with asynchronous communications.

AB - Free-vortex wake models are capable of providing an accurate and physically detailed representation of the main rotor wake for flight dynamics simulation. Recent advances in computing power and efficient algorithms have made it feasible to use free wakes for real-time simulation. The CHARM free-vortex wake model was integrated with the GENHEL flight dynamics simulation of the UH-60A helicopter. A high fidelity wake model was defined by increasing the spatial and temporal resolution of the wake until a converged response was observed, but this baseline model could not execute in real-time. A parametric study was performed to find the best combination of wake parameters to achieve real-time execution with minimal deviation from the baseline model. Multiple variations in the wake properties were tested for execution framerate and their frequency and time responses in the pitch and roll axes were compared to those of the baseline model. A real-time model was selected and showed reasonable agreement with the baseline model as compared to a finite-state inflow model. The free wake models resulted in significantly different off-axis response and large amplitude response than the finite-state inflow model. A parallel implementation of the free wake model was also investigated. An increase in computational efficiency could be achieved using a distributed processing approach with asynchronous communications.

UR - http://www.scopus.com/inward/record.url?scp=84883495165&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84883495165&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:84883495165

SN - 9781617829321

T3 - Annual Forum Proceedings - AHS International

SP - 1093

EP - 1110

BT - 61st Annual Forum Proceedings - AHS International

ER -

Horn JF, Bridges DO, Wachspress DA, Rani SL. Implementation of a free-vortex wake model in real-time simulation of rotorcraft. In 61st Annual Forum Proceedings - AHS International. 2005. p. 1093-1110. (Annual Forum Proceedings - AHS International).