Journal Publications
”A second order extension of the generalized-alpha method for constrained systems in mechanics, ” L. O. Jay, D. Negrut, invited contribution, Springer-Verlag "Computational Methods in Applied Sciences" series, E. Onate editor, 2008, accepted.
”A Discussion of Low Order Numerical Integration Formulas for Rigid and Flexible Multibody Dynamics, ” D. Negrut, L. O. Jay, N. Khude, ASME Journal of Computational and Nonlinear Dynamics, accepted, 2008.
”Implicit and explicit integration in the solution of the absolute nodal coordinate differential/algebraic equations, ” B. Hussein, D. Negrut, A. Shabana, Nonlinear Dynamics, accepted, 2008.
”Quasicontinuum-like reduction of DFT calculations of nanostructures, ” D. Negrut, M. Anitescu, A. El-Azab, P. Zapol, Journal of Nanoscience and Nanotechnology, Vol. 8, pp. 3729-3740, 2008.(pdf)
”Extensions of the HHT-method to differential-algebraic equations in mechanics”, L. O. Jay, D. Negrut, Electronic Transactions on Numerical Analysis, Vol. 26, pp. 190-208, 2007.(pdf)
”On the regularity of reduced models obtained by quasicontinuum-like approaches, ” M. Anitescu, D. Negrut, P. Zapol, A. El-Azab, Mathematical Programming, accepted, 2007.(pdf)
”On an Implementation of the HHT Method in the Context of Index 3 Differential Algebraic Equations of Multibody Dynamics,” D. Negrut, R. Rampalli, G. Ottarsson, and A. Sajdak, ASME Journal of Computational and Nonlinear Dynamics, Vol. 2, No. 1, pp. 73-85, 2007. (pdf)
”A Practical Approach for the Linearization of the Constrained Multibody Dynamics Equations,” D. Negrut, and J. Ortiz, ASME Journal of Computational and Nonlinear Dynamics, Vol.1, Issue 3, pp.230-239, 2006. (pdf)
”A Rosenbrock-Nystrom State Space Implicit Approach for the Dynamic Analysis of Mechanical Systems: I – Theoretical Formulation,” A. Sandu, D. Negrut, E. Haug, F. Potra and C. Sandu, Journal of Multi-body Dynamics, Vol. 217, No. 4, pp. 263-271(9), 2003. (pdf)
”A Rosenbrock-Nystrom State Space Implicit Approach for the Dynamic Analysis of Mechanical Systems: II – The Method and Numerical Examples,” D. Negrut, A. Sandu, E. Haug, F. Potra and C. Sandu, Journal of Multi-body Dynamics, Vol. 217, No. 4, pp. 273-281(9), 2003. (pdf)
“Linear algebra considerations for the multi-threaded simulation of mechanical systems,” D. Negrut, Multibody System Dynamics, Vol. 10, No. 1, pp.61-80, 2003. (pdf)
”An Implicit Runge-Kutta Method for the Integration of Differential-Algebraic Equations of Multibody Dynamics,” D. Negrut, E.J. Haug and H.C. German, Multibody System Dynamics, Vol. 9, No.2, pp.121-142, 2003. (pdf)
”Numerical Methods for High-Speed Vehicle Dynamic Simulation,” E. J. Haug, D. Negrut, R. Serban and D. Solis, Mechanics of Structures and Machines, Vol. 27(4), 1999. (pdf)
”Implicit Runge-Kutta Integration of the Equations of Multibody Dynamics in Descriptor Form,” E. Haug, D. Negrut and C. Engstler, Mechanics of Structures and Machines, Vol. 27(3), 1999. (pdf)
”A State-Space Based Implicit Integration Algorithm for Differential-Algebraic Equations of Multibody Dynamics,” E. Haug, D. Negrut and M. Iancu, Mechanics of Structures and Machines, Vol. 25(3), 1997. (pdf)
”A Topology Based Approach for Exploiting Sparsity in Multibody Dynamics. The Cartesian Formulation,” R. Serban, D. Negrut, F.A. Potra, and E.J. Haug, Mechanics of Structures and Machines, Vol. 25(3), 1997. (pdf)
”A Topology Based Approach for Exploiting Sparsity in Multibody Dynamics. The Joint Formulation,” D. Negrut, R. Serban, F.A. Potra, and E.J. Haug, Mechanics of Structures and Machines, Vol. 25(2), 1997. (pdf)
Selected Conference Papers
"Exact linearization of multibody systems using user-defined coordinates" joint with Jose L. Ortiz, SAE Technical Paper Series2006-01-0587, International Congress & Exposition, Detroit, MI, 2006.
"Improved simulation of models with complex user-subroutines in MSC.ADAMS" joint with Gisli Ottarsson, Michael Belczynski, and Charlott Corcoran, SAE Technical Paper Series2006-01-0158, International Congress & Exposition, Detroit, MI, 2006.
"Simulating nanoscale processes in solids using DFT and the Quasicontinuum Method" joint with M. Anitescu, T.Munson, and P.Zapol, IMECE 2005-81755, ASME 2005 International Mechanical Engineering Congress and Exposition, Orlando, Florida, 2005.
"The Newmark integration method for simulation of multibody systems: analytical considerations" joint with B. Gavrea, and F. Potra, IMECE 2005-81770, ASME 2005 International Mechanical Engineering Congress and Exposition, Orlando, Florida, 2005. (pdf)
"On the use of the HHT method in the context of index 3 Differential Algebraic Equations of Multibody Dynamics" joint with R. Rampalli, G. Ottarsson, and A. Sajdak, IDETC/MSNDC 2005, ASME 2005 International Design Engineering Technical Conferences, Long Beach, California, 2005. (pdf)
"On an approach for the linearization of the Differential Algebraic Equations of Multibody Dynamics", joint work with Jose Ortiz, 2005 ASME/IEEE International Conference on Mechatronic and Embedded Systems and Applications, Long Beach, California, 2005. (pdf)
"On the Issue of Iterative Linear Algorithms for the Multi-Threaded Simulation of Mechanical Systems Represented in Cartesian Coordinates", Virtual Nonlinear Multibody Sistems, NATO Advanced Study Institute, W. Schiehlen, M. Valasek(eds.), 2002, Prague, Czech Republic.
"An Implicit Runge-Kutta Based State-Space Method for the Integration of the Differential-Algebraic Equations of Multibody Dynamics" joint with E.J. Haug and H.C. German, Sixth U.S. National Congress on Computational Mechanics, 2001, Dearborn, MI.
"The ADAMS C++ Solver:Expression Based Multibody Dynamics Simulation", joint with G. Ottarsson, T. McDevitt, J. Ortiz and M. Belczynski, Sixth U.S. National Congress on Computational Mechanics, 2001, Dearborn, MI.
"The ADAMS C++ class library: Extensability through object oriented programming", joint with G. Ottarsson, T. McDevitt, J. Ortiz and M. Belczynski, Sixth U.S. National Congress on Computational Mechanics, 2001, Dearborn, MI.
"State Space Methods for Implicit Integration of Equations of Multibody Dynamics", joint with E. Haug, Advances in Design Automation - Proceedings of the ASME Design Automation Conference,1999, Las Vegas, NV.
"Variable Step Implicit Integration of Stiff Multibody Systems", joint with E. Haug and M. Iancu, Computational Methods in Mecahnisms, J. Angeles and E. Zakhariev (Eds.), NATO ASI Conference, 1997, Varna, Bulgaria. (pdf)
"Parameter Identification for Multibody Dynamic Systems, joint with R. Serban and J.S. Freeman, Proceedings of the 1997 ASME Design Automation Conference, 1997, Sacramento, CA.
"Implicit Integration of the Equations of Multibody Dynamics in Descriptor Form", joint with E.J. Haug and M. Iancu, Advancesin Design Automation-Proceedings of the ASME Design Autmation Conference, 1997, Sacramento, CA.
"Implicit Integration of the Equations of Multibody Dynamics: Descriptor Form", joint with E.J. Haug and M. Iancu, Computational Methods in Mecahnisms, NATO ASI Conference, 1997, Varna, Bulgaria.
"Implicit Integration of the Equations of Multibody Dynamics", joint with E.J. Haug and M. Iancu, J. Angeles and E. Zakhariev (Eds.), NATO ASI Conference, 1997, Varna, Bulgaria.
"Dynamic Tire Modeling for Application with Vehicle Simulations Incorporating Terrain", joint with J.Freeman, SAE Technical Paper Series940223, International Congress & Exposition, Detroit, MI, 1994.
Invited Talks, Seminars
"On using Cartesian Coordinates for Molecular Dynamics Simulations", presented at "Mathematical Issues in Molecular Dynamics" workshop, June 2005, Banff, Canada.
"Advanced ADAMS Solver Seminar", November 25-26, 2004, Munich, Germany
"Advanced ADAMS Solver Seminar", September 13-14, 2004, Tokyo, Japan
"Advanced ADAMS Solver Seminar", September 9-10,2004, Beijing, China
"The HHT and Newmark Formulas in the Context of Differential Algebraic Equations of Multibody Dynamics", VI World Congress on Computational Mechanics, September 2004, Beijing, China
"Multi-Threaded Simulation of Mechanical Systems", VI World Congress on Computational Mechanics, September 2004, Beijing, China