Aerospace Engineering

N. Sri Namachchivaya

Professor

navam@uiuc.edu

Return to: Faculty

Office address	Mailing Address	Research Group
301 Talbot Lab 217-244-0683	306 Talbot Lab 104 S. Wright St. Urbana, IL 61801	Nonlinear Systems Group
Research Areas
The range of subjects in which nonlinearity and noise play a significant role is enormous. Advances in nonlinear and stochastic dynamics have been rapid in the past decade, with applications to almost all fields of engineering. It has brought about an enormous number of discoveries of many important new phenomena. The overall goal of our investigations has been to formulate and develop methods of analysis for complex interactions between noise and inherent nonlinearities in mechanical and structural systems, and to suppress undesirable vibrations which can lead to failure. Practical applications of these new fundamental results are beginning to appear across the entire spectrum of mechanics; for example, stability of aircraft at high angles of attack, wave propagation in random media, mixing and transport phenomena in fluid mechanics. Some of the results are even contrary to intuition, such as stabilization by noise and stochastic resonance. Multi-scale phenomena, dimensional reduction, and stability and bifurcations of invariant measures that arise in the study of nonlinear and stochastic systems are the focus of several projects.

Office address

Mailing Address

Research Group

301 Talbot Lab
217-244-0683

306 Talbot Lab
104 S. Wright St.
Urbana, IL 61801

Nonlinear Systems Group

Research Areas

The range of subjects in which nonlinearity and noise play a significant role is enormous. Advances in nonlinear and stochastic dynamics have been rapid in the past decade, with applications to almost all fields of engineering. It has brought about an enormous number of discoveries of many important new phenomena.

The overall goal of our investigations has been to formulate and develop methods of analysis for complex interactions between noise and inherent nonlinearities in mechanical and structural systems, and to suppress undesirable vibrations which can lead to failure. Practical applications of these new fundamental results are beginning to appear across the entire spectrum of mechanics; for example, stability of aircraft at high angles of attack, wave propagation in random media, mixing and transport phenomena in fluid mechanics. Some of the results are even contrary to intuition, such as stabilization by noise and stochastic resonance.

Multi-scale phenomena, dimensional reduction, and stability and bifurcations of invariant measures that arise in the study of nonlinear and stochastic systems are the focus of several projects.

View more information about Professor NamachchivayaDr. N. Sri Namachchivaya is a Professor of Aerospace Engineering and the Director of the Nonlinear Systems Group. He holds a Ph.D. in Applied Mechanics from University of Waterloo, Canada. He joined the Department of Aerospace Engineering as an Assistant Professor in August 1985. His research interests include nonlinear and random dynamical systems, multi-scale phenomena, dimensional reduction, and stability and bifurcations of invariant measures. His research activities have been supported by funding from NSF, ONR, AFOSR, DOE, EPRI, and Industry. Professor Sri Namachchivaya has published over 90 scientific articles in journals and books, has co-edited 12 books on nonlinear and random dynamical systems. He has been a distinguished visiting professor at the Technical University of Vienna (Austria), University of Bremen (Germany), the Fields Institute for Research in Mathematical Sciences (Canada), University of Queensland (Australia), Florida Atlantic University, and the University of Maryland. He is on the editorial board of the Journal of Applied Mechanics, Journal of Nonlinear Science, Stochastics and Dynamics, MECCANICA, Journal Nonlinear Studies, and on the advisory board of other journals in the area of nonlinear and stochastic dynamics. Professor Sri Namachchivaya has been co-chair of 8 international conferences and co-organizer of 12 Mini-Symposia on applications of nonlinear and random dynamical systems.

Education:

Ph.D., Applied Mechanics, University of Waterloo, October 1984
M.A.Sc., Applied Mechanics, University of Waterloo, May 1981
B.Tech., Civil Engineering, I.I.T. Kanpur, India, October 1979

Academic Positions:

Assistant Professor, University of Illinois, Aug. 1985 - Aug. 1990
Visiting Assistant Professor, University of Minnesota, July 1986 - Aug. 1986
Visiting Scientist, The Fields Institute for Research, Jan. 1993 - June 1993
Visiting Professor, University of Bremen, Germany Sept. 1993 - Dec. 1993
Visiting Professor, University of Queensland, Australia, Dec. 1995 - Jan. 1996,
Associate Professor, University of Illinos, Aug. 1990 - Aug. 1996
Professor, University of Illinois, Aug. 1996 - present
Research Assistant, I.I.T. Kanpur, Kanpur, India, May 1979 - Aug. 1979
Teaching Assistant, University of Waterloo, Ontario, Canada, 1980-1984
Research Assistant, University of Waterloo, Ontario, Canada, 1981-1984
Post Doctoral Fellow, University of Waterloo, Ontario, Canada, 1984-1985

Major Honors and Awards:

Associate Editor, Journal of Applied Mechanics(ASME), 2003- present
Editorial board, Journal Nonlinear Studies, I& S Publishers, 2001- present
Editorial board, Stochastics and Dynamics, World Scientific , 2000- present
Editorial board, MECCANICA, Kluwer Academic Publishers, 1998- present
Editorial board, Journal of Nonlinear Science, Springer-Verlag, 1997- present
Editorial board, International Journal of Nonlinear Dynamics, 1995
Alumni Gold Medal for Outstanding Academic Performance, 1984
Xerox Award for Outstanding Faculty Research, 1989
Presidential Young Investigator Award, 1990
Senior Xerox Award for Outstanding Faculty Research, 1993
Visiting Scientist Fellowship, The Fields Institute for Research in Mathematical Sciences, Canada, 1993
Keynote Lecture on Stochastic Dynamics, IUTAM Symposium on Nonlinearity and Chaos in Engineering Dynamics, London, UK, 1993
University Distinguished Visiting Professor, University of Queensland, Brisbane, Australia, 1995
University Distinguished Visiting Professor, Technical University of Vienna, Austria, 1997
Schmidt Distinguished Visiting Professor, Florida Atlantic University, Boca Raton, FL, 1998
Keynote Lecture on Nonlinear Dynamics, International Conference on Analysis of Vibrating Systems, Banff, Canada, 1999
Keynote Lecture on Stochastic Stability and Bifurcation, International Conference on Stochastic and Chaotic Dynamics, Ambleside, UK, 1999
Southwest Mechanics Lecture Series Lecturer, 1999
Keynote Lecture on Nonstandard Reduction and Analysis of Noisy Mechanical Systems, International Conference on Symmetry and Stability in Nonlinear Mechanics, Budapest, Hungary, 2000

Selected Publications:

N. Sri Namachchivaya and Lalit Vedula, ``Real Noise Stabilization of Linear Systems: Application to Flow Induced Oscillations", Journal of Dynamics and Stability of Systems, Vol. 15(2), 2000, pp. 185-208.
N. Sri Namachchivaya and R. Sowers, ``Unified Approach for Noisy Nonlinear Mathieu-Type Systems", Stochastics & Dynamics, Vol. 1(3), 2001, pp. 405-450.
N. Malhotra, N. Sri Namachchivaya, and R.J. McDonald, ``Global Bifurcations in the Motion of Flexible Spinning Discs", Journal of Nonlinear Science, Vol. 12(1), 2002.
N. Sri Namachchivaya and H. J. Van Roessel, ``A Center Manifold Analysis of Variable Speed Machining", Journal of Dynamical Systems, Vol. 18(3), 2003, pp. 245--270.
Ludwig Arnold, Peter Imkeller, and N. Sri Namachchivaya, ``The Asymptotic Almost-Sure Stability of a Noisy Nonlinear Oscillator", Journal of Sound and Vibration/, Vol. 269(3-5), 2004, pp. 1003--1029.