NASA SBIR 01-1 Solicitation


PROPOSAL NUMBER: A2.02-9586 (For NASA Use Only - Chron: 012413 )
Real-Time Flight Simulation for Rotorcraft Wake Encounters and Vortex Ring State

An integral element of meeting NASA's objective of tripling airport
throughput over the next decade is the utilization of helicopters and
tiltrotors to provide feeder service to major airports. Among the key
challenges in ensuring safe, high-volume terminal area rotorcraft
operations are identifying and mitigating potential hazards posed by
complex aeromechanical interactions ranging from wake vortex encounters to
powered flight in steep descent. To address these challenges, it is
imperative to develop fast yet high-fidelity rotorcraft vortex wake
modeling methods and simulation models in these flight regimes. To meet
this need, a physics-based analysis will be developed that captures key
aspects of rotorcraft wake aeromechanics in the complex terminal area
flight environment, including both interactions with wakes of nearby
aircraft and "self-interactions", such as vortex ring state. The enabling
technical innovation will be novel fast viscous/turbulent wake decay and
vorticity transport methodologies tailored to rotorcraft and coupled with
the state-of-the-art real time free wake simulation capabilities of the
CHARM rotorcraft model. The resulting product will be a hierarchy of
models enabling both detailed off-line assessment and on-line real-time flight simulation of potentially hazardous flight conditions including rotorcraft wake encounters and vortex ring state.

The proposed simulation could be used to determine safe operation
procedures for tiltrotors and rotorcraft used as shuttle service between
local airports and major airport hubs. Assessment results from this code
could be implemented within or used in support of NASA's AVOSS system for
reducing IFR spacing requirements between tiltrotors and aircraft.
Rotorcraft manufacturers could use this tool to enhance "design for safety"
of future rotorcraft. In addition, a capability for predicting rotorcraft
flight dynamics in terminal area operations would directly support flight
training activities by simulation manufacturers and rotorcraft operators,
as well as the military services.

NAME AND ADDRESS OF PRINCIPAL INVESTIGATOR (Name, Organization Name, Mail Address, City/State/Zip)
Daniel A. Wachspress
Continuum Dynamics, Inc.
34 Lexington Avenue
Ewing , NJ   08618 - 2302

NAME AND ADDRESS OF OFFEROR (Firm Name, Mail Address, City/State/Zip)
Continuum Dynamics, Inc.
34 Lexington Avenue
Ewing , NJ   08618 - 2302

Form Printed on 06-19-01 15:44