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Noether symmetries of the nonconservative and nonholonomic systems on time scales

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Abstract

In this paper we give a new method to investigate Noether symmetries and conservation laws of nonconservative and nonholonomic mechanical systems on time scales \(\mathbb{T}\), which unifies the Noether’s theories of the two cases for the continuous and the discrete nonconservative and nonholonomic systems. Firstly, the exchanging relationships between the isochronous variation and the delta derivatives as well as the relationships between the isochronous variation and the total variation on time scales are obtained. Secondly, using the exchanging relationships, the Hamilton’s principle is presented for nonconservative systems with delta derivatives and then the Lagrange equations of the systems are obtained. Thirdly, based on the quasi-invariance of Hamiltonian action of the systems under the infinitesimal transformations with respect to the time and generalized coordinates, the Noether’s theorem and the conservation laws for nonconservative systems on time scales are given. Fourthly, the d’Alembert-Lagrange principle with delta derivatives is presented, and the Lagrange equations of nonholonomic systems with delta derivatives are obtained. In addition, the Noether’s theorems and the conservation laws for nonholonomic systems on time scales are also obtained. Lastly, we present a new version of Noether’s theorems for discrete systems. Several examples are given to illustrate the application of our results.

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Authors and Affiliations

  1. Institute of Mathematical Physics, Zhejiang Sci-Tech University, Hangzhou, 310018, China

    PingPing Cai & JingLi Fu

  2. Department of Physics, Liaoning University, Shenyang, 110036, China

    YongXin Guo

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  1. PingPing Cai
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  2. JingLi Fu
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  3. YongXin Guo
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Correspondence to JingLi Fu.

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Cai, P., Fu, J. & Guo, Y. Noether symmetries of the nonconservative and nonholonomic systems on time scales. Sci. China Phys. Mech. Astron. 56, 1017–1028 (2013). https://doi.org/10.1007/s11433-013-5065-x

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  • DOI: https://doi.org/10.1007/s11433-013-5065-x

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