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: Contribution to journalConference article

2 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)
Pages (from-to)2057-2075
Number of pages19
JournalAnnual Forum Proceedings - AHS International
Volume2
StatePublished - Dec 1 2005
Event61st Annual Forum Proceedings - AHS International - Grapevine, TX, United States
Duration: Jun 1 2005Jun 3 2005

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, Joseph Francis ; Bridges, Derek O. ; Wachspress, Daniel A. ; Rani, Sarma L. / Implementation of a free-vortex wake model in real-time simulation of rotorcraft. In: Annual Forum Proceedings - AHS International. 2005 ; Vol. 2. pp. 2057-2075.
@article{4d7fe5fe3e754974a15ba9109bb02cd7,
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)",
volume = "2",
pages = "2057--2075",
journal = "Annual Forum Proceedings - AHS International",
issn = "1552-2938",
publisher = "American Helicopter Society",

}

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.

In: Annual Forum Proceedings - AHS International, Vol. 2, 01.12.2005, p. 2057-2075.

Research output: Contribution to journalConference article

TY - JOUR

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=33644672067&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33644672067&partnerID=8YFLogxK

M3 - Conference article

AN - SCOPUS:33644672067

VL - 2

SP - 2057

EP - 2075

JO - Annual Forum Proceedings - AHS International

JF - Annual Forum Proceedings - AHS International

SN - 1552-2938

ER -