Chinese Physics Letters,2011年28(11): 110203-1-110203-4 ISSN：0256-307X
[Cai Jian-Le; Huang Wei-Li] Hangzhou Normal Univ, Coll Sci, Hangzhou 310018, Zhejiang, Peoples R China.;[Huang Wei-Li] Hunan City Univ, Dept Phys & Telecom Engn, Yiyang 413000, Peoples R China.
[Cai Jian-Le] Hangzhou Normal Univ, Coll Sci, Hangzhou 310018, Zhejiang, Peoples R China.
Higher-Order Lagrange Systems;Lie Point Transformation
Conformal invariance and conserved quantities for a higher-order Lagrange system by Lie point transformation of groups are studied. The differential equation of motion for the higher-order Lagrange system is introduced. The definition of conformal invariance for the system together with its determining equations and conformal factor are provided. The necessary and sufficient condition that the system's conformal invariance would be Lie symmetry by the infinitesimal one-parameter point transformation group is deduced. The conserved quantity of the system is derived using the structural equation satisfied by the gauge function. An example of a higher-order mechanical system is offered to illustrate the application of the result.
Applied Mathematics and Mechanics (English Edition),2012年33(11):1393-1402 ISSN：0253-4827
[Huang, Wei-Li; Cai, Jian-Le] College of Science, Hangzhou Normal University, Hangzhou 310018, China;[Huang, Wei-Li] Department of Physics and Telecom Engineering, Hunan City University, Yiyang 413000, Hunan Province, China
[Cai, Jian-le] Hangzhou Normal Univ, Coll Sci, Hangzhou 310018, Peoples R China.
Conformal invariance - Conserved quantity - Lie symmetries - Nonholonomic systems - Sufficient conditions - Variable mass
Conformal invariance and conserved quantities for a nonholonomic system of Chetaev’s type with variable mass are studied. The conformal factor expressions are derived. The necessary and sufficient conditions are obtained to make the system’s conformal invariance Lie symmetrical. The conformal invariance of the weak and strong Lie symmetries for the system is given. The corresponding conserved quantities of the system are derived. Finally, an application of the result is shown with an example.