Education
Ph.D. (1973) - Electrical Engineering, Rensselaer Polytechnic Institute, Troy, NY
M.Tech. (1969) - Electrical Engineering, Indian Institute of Technology, Kanpur,India
B.Sc.Engg. (1967) - Electrical Engineering, Banaras University, India
Work Experience
1983-present: Senior Research Scientist (1983-97), and Senior Scientist for Control Theory (1997-pres), NASA Langley Research Center, Hampton, VA
1975-1983: Associate Research Professor, Electrical and Mechanical Engg, Old Dominion University Research Foundation, Norfolk, VA (Resident at NASA-Langley Research Center)
1973-1975: National Research Council Postdoctoral Fellow, NASA-Langley Research Center
1972-1973: Control Systems Specialist Engineer, Stone and Webster Engineering Corp., Boston, MA
Adjunct and Visiting Faculty Positions
1992-1993: Visiting Professor- Electrical and Mechanical Engg, University of Virginia, Charlottesville, VA
1988-2003: Adjunct Professor, George Washington University (NASA-Langley location)
Significant Honors
NASA Distinguished Service Medal (2010)
American Automatic Control Council- Control Engineering Practice Award (2009)
IEEE Outstanding Engineer Award- Region 3 (South-Eastern USA) (2007)
ASME Charles S. Draper Innovative Practice Award (Dynamic Systems & Control Division) (2006)
IEEE Judith A. Resnik Award for contributions to space engineering (2003)
Fellow-ASME (1998)
IEEE Control System Technology Award (1995)
Fellow-AIAA (1994)
Fellow-IEEE (1993)
NASA Floyd Thompson Fellow Award n(1992)
NASA Dual Career Ladder Award (1992)
Allen B. DuMont Prize, Rensselaer Polytechnic Institute, Troy, NY (1973)
Research Interests and Professional Activities
Primary research interests- Various aspects of multivariable control theory and applications to advanced spacecraft and aircraft. Some past research contributions include: novel decoupled fine-pointing control laws for space-based systems that require sub-arc-second accuracy; fundamental robust control theory for flexible space structures; globally stable closed-loop maneuvering and attitude control laws for nonlinear multibody flexible spacecraft and manipulators; and energy-extracting active control methods for noise reduction. Served as a key technical leader in the Control-Structure Interaction(CSI) program, which incorporated the concepts and results to produce a new methodology for integrated design of spacecraft that are optimal with respect to structural design as well as control system design.
Recent and current research- Control of systems under dynamics uncertainties, anomaly, and failures, with applications to aircraft. In particular, co-developed new direct adaptive control schemes that enable stable control in spite of anomaly such as unknown actuator failures (e.g., stuck control surfaces, hydraulics failures, engine failure), icing, and structural damage, occurring at unknown instants of time.
Publications- Over 210 technical publications including 3 books and 5 book chapters.
Professional Activities- Served in many active leadership roles in the IEEE, AIAA, and ASME; several editorial boards (journals and conferences), governing boards, technical- and program- committees, panels, and steering committees. As an amateur cartooninst, regularly contributed of the Out of Control technical cartoons in the IEEE Control Systems Magazine (1985-94). Non-controls technical interests include Digital signal processing (incl image and speech Processing); Digital communications; Satellite, wireless, and cellular communications; Pattern recognition; Robotics; Active control of noise; and Cross-discipline applications of system theory.