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In this paper, the form invariance and the Lie symmetry of Lagrange's equations for nonconservative system in generalized classical mechanics under the infinitesimal transformations of group are studied, and the Noether's conserved quantity, the new form conserved quantity, and the Hojman's conserved quantity of system are derived from them. Finally, an example is given to illustrate the application of the result. 相似文献
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In this paper, the form invariance and the Lie symmetry of Lagrange's equations for nonconservative system in generalized classical mechanics under the infinitesimal transformations of group are studied, and the Noether's conserved quantity, the new form conserved quantity, and the Hojman's conserved quantity of system are derived from them. Finally, an example is given to illustrate the application of the result. 相似文献
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广义经典力学系统的对称性与Mei守恒量 总被引:4,自引:0,他引:4
研究广义经典力学系统的对称性和一类新型守恒量——Mei守恒量.在高维增广相空间中建立 了系统的运动微分方程;给出了系统的Mei对称性、Noether对称性和Lie对称性的判据;得 到了分别由三种对称性导致Mei守恒量的条件和Mei守恒量的形式.举例说明结果的应用.关键词:广义经典力学Mei对称性Noether对称性Lie对称性守恒量 相似文献
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单面完整约束力学系统的形式不变性 总被引:3,自引:4,他引:3
研究单面完整约束力学系统的形式不变性.根据运动微分方程的形式在无限小变换下的不变性,给出了单面完整约束力学系统形式不变性的定义和判据,建立了系统的形式不变性与Noether对称性、Lie对称性之间的关系,并举例说明结果的应用.关键词:分析力学单面约束形式不变性Lie对称性Noether对称性守恒量 相似文献
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In this paper,we study the relation between the form invariance and Lie symmetry of non-holonomic systems.Firstly,we give the definitions and criteria of the form invariance and Lie symmetry in the systems.Next,their relation is deduced.We show that the structure equation and conserved quantity of the form invariance and Lie symmetry of non-holonomic systems have the same form.Finally,we give an example to illustrate the application of the result. 相似文献
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This paper focuses on studying a conformal invariance and a Noether symmetry, a Lie symmetry for a Birkhoffian system in event space. The definitions of the conformal invariance of the system are given. By investigation on the relations between the conformal invariance and the Noether symmetry, the conformal invariance and the Lie symmetry, the expressions of conformal factors of the system under these circumstances are obtained. The Noether conserved quantities and the Hojman conserved quantities directly derived from the conformal invariance are given. Two examples are given to illustrate the application of the results. 相似文献
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Chaplygin系统的Noether对称性与形式不变性 总被引:12,自引:3,他引:12
利用d’AlembertLagrange原理的Chaplygin形式在无限小变换下的变形形式得到Chaplygin系统的广义Noether等式和守恒量的形式.研究Chaplygin系统的形式不变性以及它与Noether对称性的关系.关键词:Chaplygin系统Noether对称性形式不变性守恒量 相似文献
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In this paper, the definition and criterion of the form invariance of Nielsen equations for relativistic variable mass nonholonomic systems are given. The relation between the form invariance and the Noether symmetry is studied.Finally, we give an example to illustrate the application of the result. 相似文献
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This paper studies the Lie symmetries and Noether conserved quantities of discrete mechanical systems with variable mass. The discrete Euler-Lagrange equation and energy evolution equation are derived by using a total variational principle. The invariance of discrete equations under infinitesimal transformation groups is defined to be Lie symmetry. The condition of obtaining the Noether conserved quantities from the Lie symmetries is also presented. An example is discussed for applications of the results. 相似文献
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关于Noether对称性的两种理解 总被引:1,自引:0,他引:1
介绍了对Lagrange系统Noether对称性的两种理解,一种理解为Lagrange函数的不变性,另一种理解为作用量的不变性.研究表明,这两种理解是不同的.在一些条件下,Lagrange函数的不变性可以成为作用量的不变性,在另一些条件下,作用量的不变性可以成为Lagrange函数的不变性.将Noether对称性理解为作用量的不变性是合理的.关键词:Lagrange系统Noether对称性作用量的不变性Lagrange函数的不变性 相似文献
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Emden方程的Mei对称性、Lie对称性和Noether对称性 总被引:1,自引:0,他引:1
研究Emden动力学方程的形式不变性即Mei对称性,给出其定义和确定方程,研究Emden方程的Mei对称性与Noether对称性、Lie对称性之间的关系,寻求系统的守恒量,给出一个例子说明结果的应用.关键词:Emden动力学方程Mei对称性Noether对称性Lie对称性 相似文献
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A new conservation theorem derived directly from Mei symmetry of the generalized classical mechanical system is presented. First, the differential equations of motion of the system are established, and the definition and criterion of Mei symmetry for the system of generalized classical mechanics are given, which are based upon the invariance of dynamical functions under infinitesimal transformations. Second, the condition under which a Mei symmetry can lead to a new conservation law is obtained and the form of the conservation law is presented. And finally, an example is given to illustrate the application of the results. 相似文献
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The form invariance of Appell equations of holonomic mechanical systems under the infinitesimal transformations of groups is studied. The definition and the criterion of the form invariance of Appell equations are given. This form invariance can lead to a conserved quantity under certain conditions. 相似文献