Abstract
The fractional Noether symmetries and conserved quantities for non-conservative Lagrange systems with time delay are proposed and studied. Firstly, the fractional Hamilton variational principles for non-conservative Lagrange systems with time delay are established, and the fractional differential equations of motion with time delay are obtained. Secondly, based upon the invariance of the fractional Hamilton action with time delay under the group of infinitesimal transformations which depends on the generalized velocities, the generalized coordinates and the time, the fractional Noether symmetric transformations, the fractional Noether quasi-symmetric transformations and the fractional generalized Noether quasi-symmetric transformations with time delay are defined, and the criteria of the fractional symmetries are obtained. Finally, the relationship between the fractional symmetries and the fractional conserved quantities with time delay are studied, and the fractional Noether theories are established. At the end of the paper, two examples are given to illustrate the application of the results.
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Acknowledgments
Project was supported by the National Natural Science Foundation of China (Grant Nos.10972151 and 11272227) and the Innovation Program for Scientific Research of Suzhou University of Science and Technology (No.SKCX12S_039). And we would like to thank the anonymous referees for their valuable comments and suggestions.
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Jin, SX., Zhang, Y. Noether symmetries for non-conservative Lagrange systems with time delay based on fractional model. Nonlinear Dyn 79, 1169–1183 (2015). https://doi.org/10.1007/s11071-014-1734-1
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DOI: https://doi.org/10.1007/s11071-014-1734-1