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Aerospace Control Research at the Ohio State University Aerospace Engineering Department

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Title: Aerospace Control Research at the Ohio State University Aerospace Engineering Department


1
Aerospace 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
2
Outline
  • Overview of Current Research Projects
  • Possible Collaborative Avenues
  • Conclusions

3
Current (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)
4
Current 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)
5
CCCS 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

6
CCCS 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

7
Current 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)
8
CCCS 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

9
Current 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)
10
NASA 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

11
NASA 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

12
Current 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)
13
NASA 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

14
NASA 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

15
NASA 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

16
Current 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)
17
AFRL / 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

18
AFRL / 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

19
Current 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)
20
STTR
  • 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

21
Current 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)
22
US 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

23
Robust Stability and Control of Multi-body Ground
Vehicles (ARO)06-09
24
Robust 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.

25
Current 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)
26
Chemotherapy Drug Delivery
  • Application of uncertain linear systems control
    theory with structured uncertainty to drug
    delivery schedule relating clinical information
    in cancer chemotherapy

27
Current 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)
28
Qualitative (Sign) Stability of Ecology (Need
Sponsorship)
  • Application of concepts of biology and life
    science to engineering systems Qualitative
    (sign) stability and Robust stability (ACC06)

29
Qualitative (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 !

30
New 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

31
Current 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)
32
Uncertain 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

33
Possible 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

34
Conclusions
  • 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
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