We present a Galerkin projection technique by which finite-dimensional ordinary differential equation (ODE) approximations for delay differential equations (DDEs) can be obtained in a straightforward fashion. The technique requires neither the system to be near a bifurcation point, nor the delayed terms to have any specific restrictive form, or even the delay, nonlinearities, and/or forcing to be small. We show through several numerical examples that the systems of ODEs obtained using this procedure can accurately capture the dynamics of the DDEs under study, and that the accuracy of solutions increases with increasing numbers of shape functions used in the Galerkin projection. Examples studied here include a linear constant coefficient DDE as well as forced nonlinear DDEs with one or more delays and possibly nonlinear delayed terms. Parameter studies, with associated bifurcation diagrams, show that the qualitative dynamics of the DDEs can be captured satisfactorily with a modest number of shape functions in the Galerkin projection.
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March 2005
Technical Papers
Galerkin Projections for Delay Differential Equations
Pankaj Wahi,
pankaj@mecheng.iisc.ernet.in
Pankaj Wahi
Mechanical Engineering Department
, Indian Institute of Science, Bangalore 560012, India
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Anindya Chatterjee
anindya@mecheng.iisc.ernet.in
Anindya Chatterjee
Mechanical Engineering Department
, Indian Institute of Science, Bangalore 560012, India
Search for other works by this author on:
Pankaj Wahi
Mechanical Engineering Department
, Indian Institute of Science, Bangalore 560012, Indiapankaj@mecheng.iisc.ernet.in
Anindya Chatterjee
Mechanical Engineering Department
, Indian Institute of Science, Bangalore 560012, Indiaanindya@mecheng.iisc.ernet.in
J. Dyn. Sys., Meas., Control. Mar 2005, 127(1): 80-87 (8 pages)
Published Online: March 27, 2004
Article history
Received:
March 2, 2003
Revised:
March 27, 2004
Citation
Wahi, P., and Chatterjee, A. (March 27, 2004). "Galerkin Projections for Delay Differential Equations." ASME. J. Dyn. Sys., Meas., Control. March 2005; 127(1): 80–87. https://doi.org/10.1115/1.1870042
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