Transcript Propulsion Controls at NASA Lewis

Propulsion Controls and Diagnostics Research at
NASA GRC – Status Report
Dr. Sanjay Garg
Branch Chief
Ph: (216) 433-2685
FAX: (216) 433-8990
email: [email protected]
http://www.lerc.nasa.gov/WWW/cdtb
Presented at: Aerospace Guidance and Control System Committee Meeting
Boulder, CO, March 1, 2007
Glenn Research Center
Controls and Dynamics Branch
at Lewis Field
NASA Aeronautics’ Program Structure
Aeronautics Research Mission Directorate
Fundamental Aeronautics
Program
Aviation Safety
Program
Airspace Systems
Program
Integrated
Vehicle
Health
Management
Hypersonics
Supersonics
Subsonic
Fixed Wing
Subsonic
Rotary Wing
Super-Density
Surface
Management
Aging
Aircraft
Integrated
Flight Deck
Technologies
Integrated
Resilient
Aircraft
Control
Next
Generation
Air
Transportation
System
Propulsion Control for Fundamental Aeronautics
Fundamental Aeronautics
Program
Subsonic
Fixed Wing
• Distributed
Engine Control
• Active Flow
Control for
Compression
Systems
Subsonic
Rotary Wing
• Integrated Engine
and Transmission
control
Supersonics
• Active
Combustion
Control
• Integrated inlet /
engine control
Hypersonics
• High Speed
propulsion control
and integration
with flight control
• Mode Switch
management
• Unsteady
Combustion /
Ejection Systems
Glenn Research Center
Controls and Dynamics Branch
at Lewis Field
Propulsion Control and Diagnostics for
Aviation Safety
Aviation Safety
Program
Integrated Vehicle
Health Management
………
Propulsion Health
Management
• Self awareness and prognosis of
gas path, combustion, and overall
engine state; fault-tolerant system
architecture
• Gas Path health
management
Integrated Resilient
Aircraft Control
………
IIFD
Resilient Propulsion
Control
• Damage tolerance and
design for extended envelope
operation; onboard hazard
effects assessment, mitigation
and recovery
•…..
Glenn Research Center
Controls and Dynamics Branch
AAD
at Lewis Field
Current Engine Control Architecture
• Centralized with each sensor/actuator directly connected to FADEC
Sensor
electronics
Sensor
electronics
Sensor
electronics
CPU /
Memory
Power
FADEC
Sensor_2
Sensor_ j
BUS
Communication
Sensor_1
Actuation
electronics
Actuator_n
Actuation
electronics
Actuation
electronics
Actuator_2
Actuator_1
Centralized Engine Control
• Pros:
– Works, reliable, well-understood, experience,
comfort level
• Cons:
– Expensive, inflexible, in the future will become a
limiting factor in engine performance
– Wire harness weight forces the FADEC to be colocated on the engine structure
– Co-located FADEC requires environmental
hardening (thermal, mechanical) further
increasing weight and cost.
– Complicates fault detection and isolation
Glenn Research Center
Controls and Dynamics Branch
at Lewis Field
Distributed Engine Control
Communication
CPU /
Memory
Power
FADEC
Sensor_1
Sensor
electronics
Sensor_2
Sensor
electronics
Sensor_ j
Actuation
electronics
Actuator_n
Actuation
electronics
Actuator_2
Actuation
electronics
Actuator_1
BUS
Communication
Sensor
electronics
Distributed Engine Control
• Topologies:
– Star (point to point), Ring or bus (daisy chain)
– Wired or wireless
• Pros:
– Known to work well in other industries, much less
expensive (initial and overall cost), very flexible
• Cons:
– Communication unknowns and deterministic
behavior
– Overall increased complexity
– Requires new technologies, i.e., high temperature
electronics
Glenn Research Center
Controls and Dynamics Branch
at Lewis Field