HE Shengxin, ZHU Jianqing. Noether Quasi-Symmetry for Nonconservative Mechanical System in Phase Space Based on Fractional Models[J]. Acta Scientiarum Naturalium Universitatis SunYatseni, 2015,54(4):37-42.
HE Shengxin, ZHU Jianqing. Noether Quasi-Symmetry for Nonconservative Mechanical System in Phase Space Based on Fractional Models[J]. Acta Scientiarum Naturalium Universitatis SunYatseni, 2015,54(4):37-42.DOI:
The fractional Noether symmetries and fractional conserved quantities for a non-conservative system in phase space are proposed and discussed. Firstly
the fractional Hamilton canonical equations for the non-conservative system are established. Secondly
based upon the invariance of the fractional Hamilton action under the infinitesimal transformations of group
the definitions and criterion of fractional Noether quasi-symmetric transformations are obtained
then the relationship between a fractional Noether symmetry and a fractional conserved quantity of nonconservative system in phase space is established
and the fractional conserved quantity is obtained. Finally
the special cases
which the generalized nonpotential forces are not exit or the gauge function is equal to zero
are discussed. At the end
two examples are given to illustrate the application of the results.