Abstract
The structure-preserving property, in both the time domain and the frequency domain, is an important index for evaluating validity of a numerical method. Even in the known structure-preserving methods such as the symplectic method, the inherent conservation law in the frequency domain is hardly conserved. By considering a mathematical pendulum model, a Störmer-Verlet scheme is first constructed in a Hamiltonian framework. The conservation law of the Störmer-Verlet scheme is derived, including the total energy expressed in the time domain and periodicity in the frequency domain. To track the structure-preserving properties of the Störmer-Verlet scheme associated with the conservation law, the motion of the mathematical pendulum is simulated with different time step lengths. The numerical results illustrate that the Störmer-Verlet scheme can preserve the total energy of the model but cannot preserve periodicity at all. A phase correction is performed for the Störmer-Verlet scheme. The results imply that the phase correction can improve the conservative property of periodicity of the Störmer-Verlet scheme.
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Project supported by the National Natural Science Foundation of China (Nos. 11672241, 11372253, and 11432010), the Astronautics Supporting Technology Foundation of China (No. 2015-HT-XGD), and the Open Foundation of State Key Laboratory of Structural Analysis of Industrial Equipment (Nos.GZ1312 and GZ1605)
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Hu, W., Song, M. & Deng, Z. Structure-preserving properties of Störmer-Verlet scheme for mathematical pendulum. Appl. Math. Mech.-Engl. Ed. 38, 1225–1232 (2017). https://doi.org/10.1007/s10483-017-2233-8
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DOI: https://doi.org/10.1007/s10483-017-2233-8
Key words
- Störmer-Verlet scheme
- symplectic
- mathematical pendulum
- structurepreserving
- Hamiltonian system
- phase correction