Abstract
This paper develops a new approach to construct variational integrators. A simplified unconventional Hamilton’s variational principle corresponding to initial value problems is proposed, which is convenient for applications. The displacement and momentum are approximated with the same Lagrange interpolation. After the numerical integration and variational operation, the original problems are expressed as algebraic equations with the displacement and momentum at the interpolation points as unknown variables. Some particular variational integrators are derived. An optimal scheme of choosing initial values for the Newton-Raphson method is presented for the nonlinear dynamic system. In addition, specific examples show that the proposed integrators are symplectic when the interpolation point coincides with the numerical integration point, and both are Gaussian quadrature points. Meanwhile, compared with the same order symplectic Runge-Kutta methods, although the accuracy of the two methods is almost the same, the proposed integrators are much simpler and less computationally expensive.
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Project supported by the National Natural Science Foundation of China (Nos. 11172334 and 11202247) and the Fundamental Research Funds for the Central Universities (No. 2013390003161292)
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Fu, M., Lu, K., Li, W. et al. New way to construct high order Hamiltonian variational integrators. Appl. Math. Mech.-Engl. Ed. 37, 1041–1052 (2016). https://doi.org/10.1007/s10483-016-2116-8
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DOI: https://doi.org/10.1007/s10483-016-2116-8
Key words
- Hamiltonian system
- variational integrator
- symplectic algorithm
- unconventional Hamilton’s variational principle
- nonlinear dynamics