Lawrie N. Virgin
Professor of Mechanical Engineering and Materials ScienceProfessor Virgin's research is centered on studying the behavior of nonlinear dynamical systems. This work may be broadly divided into two components. First, investigation of the fundamental nature of nonlinear systems based on a mathematical description of their underlying equations of motion. Both analytical and numerical techniques are used with special attention focused on the loss of stability of dynamical systems.
The second area of interest is to apply recent results from nonlinear dynamical systems theory to problems of practical engineering importance. These include the nonlinear rolling motion of ships leading to capsize; buckling of axially-loaded structural components; aeroelastic flutter of aircraft panels at high supersonic speeds; vibration isolation based on nonlinear springs; energy harvesting; damage detection and structural health monitoring; and the dynamics of very flexible structures including solar sails and marine risers. Professor Virgin conducts mechanical experiments to complement these studies.
The flavor of much of this work is contained in the books:
Introduction to Experimental Nonlinear Dynamics, L.N. Virgin, Cambridge University Press, 2000.
Vibration of Axially Loaded Structures, L.N. Virgin, Cambridge University Press, 2007.
Appointments and Affiliations
- Professor of Mechanical Engineering and Materials Science
- Professor in the Department of Civil and Environmental Engineering
- Office Location: 3393 Fciemas, Duke Box 90300, Durham, NC 27708
- Office Phone: (919) 660-5342
- Email Address: email@example.com
- Ph.D. University of London (UK), 1986
- M.S. Cardiff University, 1982
- B.S. University of Manchester (England), 1981
- Experimental verification of low-order nonlinear dynamical behavior (including chaos) using mechanical models.
- The interaction between dynamics and buckling including secondary bifurcation.
- Time series analysis in the context of condition monitoring and damage detection.
- Dynamic behavior of inflatable and lightwieght structures for space applications.
- Nonlinear aeroelasticity of airfoils, wings and panels.
- Parametric excitation of slender structural components including rotorblades and struts.
- Rocking, sliding, bouncing and overturning of rigid blocks with applications in earthquake engineering and the nuclear industry.
Awards, Honors, and Distinctions
- Frocht Award. Society for Experimental Mechanics. 2016
- International Gas Turbine Institute's (IGTI) J. P. Davis Award. American Society of Mechanical Engineers. 2012
- CEE 647: Buckling of Engineering Structures
- COMPSCI 524: Nonlinear Dynamics
- ME 392: Undergraduate Projects in Mechanical Engineering
- ME 394: Engineering Undergraduate Fellows Projects
- ME 473: Aerospace Structures
- ME 490: Special Topics in Mechanical Engineering
- ME 491: Special Projects in Mechanical Engineering
- ME 492: Special Projects in Mechanical Engineering
- ME 493: Engineering Undergraduate Fellows Projects
- ME 527: Buckling of Engineering Structures
- ME 592: Research Independent Study in Mechanical Engineering or Material Science
- ME 742: Nonlinear Mechanical Vibration
- ME 759: Special Readings in Mechanical Engineering
- PHYSICS 513: Nonlinear Dynamics
- Brzeski, P; Virgin, LN, System identification of energy dissipation in a mechanical model undergoing high velocities: An indirect use of perpetual points, Mechanical Systems and Signal Processing, vol 108 (2018), pp. 115-125 [10.1016/j.ymssp.2018.02.010] [abs].
- Harvey, PS; Virgin, LN, Effect of stiffener geometry on the response of grid-stiffened panels, Journal of Engineering Mechanics, vol 144 no. 2 (2018) [10.1061/(ASCE)EM.1943-7889.0001415] [abs].
- Virgin, L, Enhancing the teaching of structural dynamics using additive manufacturing, Engineering Structures, vol 152 (2017), pp. 750-757 [10.1016/j.engstruct.2017.09.052] [abs].
- Virgin, L, Enhancing the teaching of linear structural analysis using additive manufacturing, Engineering Structures, vol 150 (2017), pp. 135-142 [10.1016/j.engstruct.2017.07.054] [abs].
- Plaut, RH; Virgin, LN; Knight, JD, Predicting critical speeds in various rotordynamics problems, Proceedings of the Institution of Mechanical Engineers Part C: Journal of Mechanical Engineering Science, vol 231 no. 21 (2017), pp. 3913-3922 [10.1177/0954406216659680] [abs].
Additional InformationResearch photographs
Many of my research projects have an experimental component, some photos can be found in the following links showing:
- A cable-suspended mass
- A fiber-optic condition monitoring system
- An airfoil with a loose flap
- An experimental Duffing system
- A thermally buckled, acoustically excited papnel
- Inflatable beams for space attennas
- A rocking block
- A highly flexible structure
- A composite beam with bolted connection
- A hardening spring oscillator
- Vibration isolation
Some of my latest research involves solar sails for deep space exploration (sponsored by NASA):
Numerical simulation has also played an important role in the development of dynamics: