THE LIE SYMMETRIES AND CONSERVED QUANTITIES OF VARIABLE-MASS NONHOLONOMIC SYSTEM OF NON-CHETAEV''''S TYPE IN PHASE SPACE

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Mei Adiabatic Invariants Induced by Perturbation of Mei Symmetry for Nonholonomic Controllable Mechanical Systems

Two types of Mei adiabatic invariants induced by perturbation of Mei symmetry for nonholonomic controllable mechanical systems are reported. Criterion and restriction equations determining Mei symmetry after being disturbed of the system are established. Form and existence condition of Mei adiabatic invariants are obtained.     

导数空间的新型D'Alembert原理及任意阶非完整系统的Gibbs-Appell方程

在导数空间中,将非完整系统变成为形式上的完整系统,建立了导数空间中新型的Ｄ’Ａｌｅｍｂｅｒｔ原理,得到了任意阶非完整系统通常形式和新型形式的ＧｉｂｂｓＡｐｐｅｌｌ 方程,并给出方程的算例。     

相空间中离散完整系统的Noether对称性和Mei对称性

研究相空间中离散完整系统的Noether对称性、Mei对称性及其导致的守恒量.利用差分离散变分方法,给出相空间中离散完整系统的差分离散变分原理,建立系统的离散正则方程和能量演化方程;给出系统Noether对称性和Mei对称性的判定条件,得到系统离散形式的Noether守恒量和Mei守恒量及其存在的条件.举例说明结果的应用. 关键词： 相空间 离散完整系统 对称性 守恒量     

Symmetry of Lagrangians of holonomic nonconservative system in event space

This paper analyzes the symmetry of Lagrangians and the conserved quantity for the holonomic non-conservative system in the event space. The criterion and the definition of the symmetry are proposed first, then a quantity caused by the symmetry and its existence condition are given. An example is shown to illustrate the application of the result in the end.     

A new type of conserved quantity of Lie symmetry for the Lagrange system

This paper studies a new type of conserved quantity which is directly induced by Lie symmetry of the Lagrange system. Firstly, the criterion of Lie symmetry for the Lagrange system is given. Secondly, the conditions of existence of the new conserved quantity as well as its forms are proposed. Lastly, an example is given to illustrate the application of the result.     

变质量二阶非ЧeTaeBg型非完整系统的守恒律

利用Jourdain微分变分原理研究变质量二阶非ЧeTaeB 型非完整系统的守恒律,引入Jourdain生成元,给出无限小变换下Jourdain原理的不变性条件,在一定条件下得到系统的守恒律,由于ЧeTaeB型非完整系统是非ЧeTaeB型非完整系统的特殊情形、常质量系统是变质量系统的特殊情形,因此,所得结果具有普遍意义。给出了应用例子。     

变质量二阶非чeтaeв型非完整系统的守恒律

利用Jourdain微分变分原理研究变质量二阶非Четаев型非完整系统的守恒律 ,引入Jourdain生成元 ,给出无限小变换下Jourdain原理的不变性条件 ,在一定条件下得到系统的守恒律。由于Четаев型非完整系统是非Четаев型非完整系统的特殊情形、常质量系统是变质量系统的特殊情形 ,因此 ,所得结果具有普遍意义。给出了应用例子。     

变质量非Четаев型非完整系统在相空间的Lie对称性与守恒量

在相空间引入无限小群变换,研究变质量非Четаев型非完整系统的Lie对称和守恒量.利用系统运动微分方程在无限小群变换下的不变性建立Lie对称的确定方程和限制方程,得到Lie对称的结构方程和守恒量,并举例说明结果的应用.     

Study of the Lie symmetries of a relativistic variable mass system

The differential equations of motion of a relativistic variable mass system are given.By using the invariance of the differential equations under the infinitesimal transformations of groups,the determining equations and the restriction equations of the Lie symmetries of a relativistic variable mass system are built,and the structure equation and the conserved quantity of the Lie symmetries are obtained.Then the inverse problem of the Lie symmetries is studied.The corresponding Lie symmetries are found according to a known conserved quantity.An example is given to illustrate the application of the result.