Arizona State University Armando A. Rodriguez
ASU Professor 




Education   

Positions Held   

Research   

Instruction   

Honors   

Societies   

Interests   

Curriculum Vitae   

Career Planning   

Home    Email    Curriculum Vitae

Robust Control of Aerospace Systems


The focus of this research is on the development of robust control system design methodologies for aerospace systems.

Application Areas
Relevant application areas include:

  • Aero-thermo-elastic-propulsion effects for air-breathing hypersonic aircraft e.g. X-43A, SOAREX, X-51A
  • Powered and unpowered hypersonic gliders/waveriders
  • Fixed-wing aircraft
  • Rotary-aircraft
  • Tilt-wing rotorcraft (TWRC)
  • Multi-Lift helicopter applications; e.g. twin-lift helicopter system (TLHS)
  • Missile Guidance, Navigation, and Control (GNC) Systems
  • Satellite systems
  • GNC for unpiloted air vehicles (UAVs)
  • Autonomous and semi-autonomous vehicles
  • Coordination of multiple cooperating vehicles
Special focus has been placed on hypersonic application for which aero-thermo-elastic-propulsion interactions are particularly significant.

Relevant Control Challenges
Relevant control challenges include:
  • uncertain nonlinearities (e.g. aero-thermo-elastic-propulsion),
  • hard nonlinearities (e.g. control position and rate saturation nonlinearities),
  • uncertain (typically high-frequency) dynamics; i.e. unmodeled differential equations, 
  • parametric uncertainty,
  • uncertain actuator and sensor dynamics,
  • MIMO dynamical coupling/interactions (e.g. aero-thermo-elastic-propulsion),
  • satisfying multivariable decoupling specifications,
  • satisfying channel-specific bandwidth specifications,
  • satisfying MIMO directionality specifications,
  • controller complexity and implementation issues,
  • digital, sample-data, and multi-rate embedded system implementation issues,
  • uncertain actuator and sensor dynamics,
  • aero-servo-elastic issues, aero-servo control reversal, aero-servo control flutter,
  • selection of weighting function parameters for dynamical optimization,
  • assessment of fundamental performance limitations and tradeoffs,
  • stabilization,
  • following of varying (typically low frequency) reference commands,
  • attenuation of (stochastic, typically low frequency) disturbances,
  • attenuation of (stochastic, typically high frequency) measurement noise,
  • control law adaptation and scheduling; e.g. on angle-of-attack (AOA), side-slip-angle (SSA), Mach number, control surface deflection, propulsion setting,
  • aero data reduction, interpolation, extrapolation,
  • constraint enforcement e.g. AOA, SSA, Mach number, acceleration, aeroservo control deflection,
  • state estimation,
  • model validation via wind tunnel and flight test data,
  • control law tuning from wind tunnel testing and flight test,
  • parameter and uncertainty estimation (system identification),
  • actuator and sensor degradation,
  • structural degradation,
  • fault tolerance.
Objectives and Goals
The main objective of this research is to develop a systematic design methodology which addresses each of the above control system design challenges. A major goal here is the development of tools that can be used by practicing engineers to design "full envelop" MIMO control systems.

Collaborators and Sponsors
Collaborators include:
  • Professor Petros Voulgaris (University of Illinois, Urbana-Champaign; Aerospace Engineering)
  • Dr. Brett Ridgely (Raytheon Missile Systems, Sr Department Manager, Autopilot Design Department, GNC Technology Director, Tucson, AZ)
  • Professor Jeff Shamma (UCLA; Mechanical Engineering)
  • Valana Wells (ASU, Mechanical and Aerospace Engineering)
This work has been sponsored by the following organizations:
  • National Science Foundation (NSF), the Consortium for Embedded and Inter-Networking  Technologies (CEINT), AFOSR,  Eglin AFB, Honeywell,  Boeing, NASA.

 

Home | Email
Curriculum Vitae | Instruction | Interests | Research | Societies
.


 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

 

control

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 



ODY>