Title: Aerospace Control Research at the Ohio State University Aerospace Engineering Department
1Aerospace Control Research at the Ohio State
University Aerospace Engineering Department
- Rama K. Yedavalli
- Professor
- Department of Aerospace Engineering
- The Ohio State University
- Columbus, OH
Oct 11,2006
2Outline
- Overview of Current Research Projects
- Possible Collaborative Avenues
- Conclusions
3Current (and Past) Research Projects
CCCS Flight Control (past)
CCCS Flow Control (past)
Qualitative Stability (Active, unfunded)
NASA Dryden (Current)
Chemotherapy Drug Delivery (Active,unfunded)
Current Research Activities
NASA Glenn / GEAE (Current)
US Army (Current)
AFRL/PR (past)
STTR/SBIR (trying)
Uncertain Systems Research (Active)
4Current Research Projects
CCCS Flight Control (past)
CCCS Flow Control (past)
Qualitative Stability (Active,unfunded)
NASA Dryden (Current)
Chemotherapy Drug Delivery (Active,unfunded)
Current Research Activities
NASA Glenn / GEAE (Current)
US Army (Current)
AFRL/PR (past)
STTR/SBIR (trying)
Uncertain Systems Research (Active)
5CCCS Flight Control (2001-2004)
- Robustness Analysis of the X-40A Dynamic
Inversion Controller - Implementation of combined Dynamic Inversion -
State Dependent Riccati Equation Technique - Stability Domain Estimation (Region of
Attraction) - Method of Vector Norms
- Sum of Squares Programming
6CCCS Flight Control
- Graduate Student Praveen Shankar
- Funded by CCCS from Oct 2001 Sept 2004
- Publications
- P. Shankar, R.K. Yedavalli, D.B. Doman Stability
Domain Estimation for Dynamic Inversion Embedded
SDRE Flight Controller, Proceedings of AIAA-GNC
Conference 2004, Providence, RI - P. Shankar, R.K. Yedavalli, D.B. Doman Dynamic
Inversion via State Dependent Riccati Equation
Approach Application to Hypersonic Vehicles,
Proceedings of AIAA-GNC Conference 2003, Austin,
TX - R.K. Yedavalli, P. Shankar, D.B. Doman
Robustness Study of a Dynamic Inversion Based
Indirect Adaptive Control System for Flight
Vehicles with Uncertain Model Data, Proceedings
of IEEE ACC Conference 2003
7Current Research Projects
CCCS Flight Control (Past)
CCCS Flow Control (Past)
Qualitative Stability (Active,unfunded)
NASA Dryden (Current)
Chemotherapy Drug Delivery (Active)
Current Research Activities
NASA Glenn / GEAE (Current)
US Army (Current)
AFRL/PR (Past)
STTR/SBIR (trying)
Uncertain Systems Research (Active)
8CCCS Flow Control (2001-2004)
- Model Reduction for Cavity Flow Control System
- Component Cost Analysis and Principal Component
Analysis - Proper Orthogonal Decomposition and Galerkin
projection - Nonlinear Model Reduction
- Cavity Flow Control
9Current Research Projects
CCCS Flight Control (Past)
CCCS Flow Control (Past)
Qualitative Stability (Active,unfunded)
NASA Dryden (Current)
Chemotherapy Drug Delivery (Active)
Current Research Activities
NASA Glenn / GEAE (Current)
US Army (Current)
AFRL/PR (Past)
STTR/SBIR (trying)
Uncertain Systems Research (Active)
10NASA Dryden (2004-2006)
- Current Research
- Implementation of Growing Radial Basis Function
Neural Network to minimize error due to modeling
and failures in control surfaces - Successfully implemented for F-15 Dynamic
Inversion Controller and F-18 Robust LQR Tracker - To be implemented on piloted simulation at NASA
Dryden - Future Research
- Design of Adaptive Critic (Neural Network with
Reinforcement Learning) for reference model
adaptation during critical failure
11NASA Dryden
- Graduate Student Praveen Shankar
- Funded by NASA Dryden
- Ph.D. defense in Spring07
- Praveen won the prestigious AIAA Orville Wright
Graduate Student Award this year
12Current Research Projects
CCCS Flight Control (Past)
CCCS Flow Control (Past)
Qualitative Stability (Active,unfunded)
NASA Dryden (Current)
Chemotherapy Drug Delivery (Active)
Current Research Activities
NASA Glenn / GEAE (Current)
US Army (Current)
AFRL/PR (Past)
STTR/SBIR (trying)
Uncertain Systems Research (Active)
13NASA Glenn / GEAE (2005-2006)
- Development of Model-predictive Engine Control to
adapt to - Engine degradation
- Engine-to-engine variation
- System faults
- Development of Estimation techniques
(Collaboration with GE) - Estimation of unmeasured parameters Thrust and
Stall Margin - Improved accuracy and robustness to system faults
14NASA Glenn / GEAE (2005-2006)
- Application of model based control strategies for
engine control - Application of model based diagnostic techniques
- Sensor fault detection and isolation in Turbine
Engine simulation model using Neural Networks and
bank of Kalman Filters - Application of model based prognostic techniques
to Turbine Engine simulation model
15NASA Glenn / GEAE (2005-2006)
- Paper published in Turbo Expo 06 in Barcelona
- Another paper on Engine Fault Detection using
Dynamic/Adaptive Threshold under review for Turbo
Expo07 in Montreal
16Current Research Projects
CCCS Flight Control (Past)
CCCS Flow Control (Pastt)
Qualitative Stability (Active,unfunded)
NASA Dryden (Current)
Chemotherapy Drug Delivery (Active)
Current Research Activities
NASA Glenn / GEAE (Current)
US Army (Current)
AFRL/PR (Past)
STTR/SBIR (trying)
Uncertain Systems Research (Active)
17AFRL / PR /UTC (2004-2005)
- Turbine Engine Control,
- Health Management,
- Diagnostics and Prognostics
- Nonlinear transient simulation
- model development of Turbine
- Engine using Matlab/Simulink
- Application of model based control strategies for
engine control - Application of model based diagnostic techniques
- Sensor fault detection and isolation in Turbine
Engine simulation model using Neural Networks and
bank of Kalman Filters - Application of model based prognostic techniques
to Turbine Engine simulation model
18AFRL / PR/UTC (2004-2005)
- Graduate Student Majid Siddiqi
- Funded by UTC from January 2004 June 2005
- R.K. Yedavalli, M. Siddiqi, A.Behbahani,
Model-based Prognostics of Turbine Engines for
Predicting Blade Cracks, paper to be presented
at the 41st AIAA/ASME/SAE/ASEE Joint Propulsion
Conference Exhibit
19Current Research Projects
CCCS Flight Control (Past)
CCCS Flow Control (Past)
Qualitative Stability (Active,unfunded)
NASA Dryden (Current)
Chemotherapy Drug Delivery (Active)
Current Research Activities
NASA Glenn / GEAE (Current)
US Army (Current)
AFRL/PR (Past)
STTR/SBIR (trying)
Uncertain Systems Research (Active)
20STTR
- Development of hardware and software algorithms
to provide autonomous flying capability for
formation of manned rotorcraft vehicles - Implementation of Robust LQR tracker with
artificial intelligence for pattern recognition - Use of GPS and wireless communication
21Current Research Projects
CCCS Flight Control (Past)
CCCS Flow Control (Past)
Qualitative Stability (Active,unfunded)
NASA Dryden (Current)
Chemotherapy Drug Delivery (Active)
Current Research Activities
NASA Glenn / GEAE (Current)
US Army (Current)
AFRL/PR (past)
STTR/SBIR (trying)
Uncertain Systems Research (Active)
22US Army (2006-2009)
- Robust Stability and Control of Multi-body Ground
Vehicles under Uncertainty and Failures - Ground Vehicle Dynamics
- Rollover stability
- Ride and Handling Performance
- Stability under failures
- Efforts to Collaborate with TARDEC in Warren, MI
23Robust Stability and Control of Multi-body Ground
Vehicles (ARO)06-09
24Robust Stability and Control of Multi-body Ground
Vehicles (ARO) 06-09
- Develop a control algorithm for the steering
command as a feedback of roll rate, scheduled in
terms of forward velocity v and c.g height
differential h. - Develop a robust control law that will perform
well in as wide velocity range as possible and in
as wide changes in the cg height as possible. - The problem is challenging because the parameter
values vary significantly as a function of the
operating condition - So innovative feedback control schemes are needed
to improve the performance of the vehicle in the
presence of all these real life perturbations and
even in component failures.
25Current Research Projects
CCCS Flight Control (past)
CCCS Flow Control (past)
Qualitative Stability (active,unfunded)
NASA Dryden (Current)
Chemotherapy Drug Delivery (Active)
Current Research Activities
NASA Glenn / GEAE (Current)
US Army (Current)
AFRL/PR/UTC (past)
STTR/SBIR (trying)
Uncertain Systems Research (Active)
26Chemotherapy Drug Delivery
- Application of uncertain linear systems control
theory with structured uncertainty to drug
delivery schedule relating clinical information
in cancer chemotherapy
27Current Research Projects
CCCS Flight Control (past)
CCCS Flow Control (past)
Qualitative Stability (active,unfunded)
NASA Dryden (Current)
Chemotherapy Drug Delivery (Active)
Current Research Activities
NASA Glenn / GEAE (Current)
US Army (Current)
AFRL/PR (past)
STTR/SBIR (trying)
Uncertain Systems Research (Active)
28Qualitative (Sign) Stability of Ecology (Need
Sponsorship)
- Application of concepts of biology and life
science to engineering systems Qualitative
(sign) stability and Robust stability (ACC06)
29Qualitative (Sign) Stability of Ecology (Need
Sponsorship)
- Given a matrix with only , - and 0s (no
magnitudes), get necessary and sufficient
conditions for Hurwitz stability using ideas from
Ecology (ACC06, ROCOND06) - Matrices which are sign stable are Hurwitz stable
for any magnitudes we put in those locations! - But the converse is not true
- Using Sign Stability of Ecology, can tabulate all
the 2x2, 3x3 and 4x4 matrices which are sign
stable apriori! Extremely interesting and
amazing !
30New Control Design Method using Sign Stability of
Ecology
- Controllers designed using Sign Stability ideas
are Robust and Nonfragile (under review for
ACODS07) - They produce Controllers of Reduced Dimension and
Reduced Control Effort because they work with
the natural dynamics rather than fight with it.
- Examples of Control Design Using Sign Stability
include Satellite Attitude Control and Formation
Flying Control - Sign Stability based Controller highly superior
to Pole Placement and LQR controllers -
31Current Research Projects
CCCS Flight Control (Past)
CCCS Flow Control (past)
Qualitative Stability (active,unfunded)
NASA Dryden (Current)
Chemotherapy Drug Delivery (Active)
Current Research Activities
NASA Glenn / GEAE (Current)
US Army (current)
AFRL/PR (past)
STTR/SBIR (trying)
Uncertain Systems Research (Active)
32Uncertain Systems Research (active)
- New Technique for Robust Stability Analysis of
Families of Linear State Space Systems - Application to Stability Analysis of Flight
Dynamics under Uncertain Parameters - Application to Determination of Drug Delivery
Schedule for Cancer Chemotherapy Models with
Uncertain Pharmacokinetic parameters - Application to Multibody Ground Vehicles with
Uncertain Dynamics and Failures - Applications possible in Engineering Dynamic
Systems in various disciplines
33Possible Collaborative Avenues
- Qualitative (sign) Stability concept from Ecology
and its role in Uncertain Engineering Systems - Need sponsorship of this important research
- Possible continued research in Turbine Engine
Fault Diagnostics and Health management - Dialogue with NASA Glenn and Engine Companies
- Possible Continued Research in Stability and
Robustness Guarantees for Neural Network Based
Nonlinear Flight Controllers - NASA NRA under review
- Will be able contribute in SBIR/STTR efforts
34Conclusions
- Engaged actively in varied research projects
- Avenues available for collaboration
- Vibrant graduate student body (Currently have 5
Ph.D students and one Masters student) - Expect continued research activity