首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  免费   5篇
物理学   5篇
  2007年   5篇
排序方式: 共有5条查询结果,搜索用时 0 毫秒
1
1.
荆宏星  李元成  夏丽莉 《物理学报》2007,56(6):3043-3049
研究变质量单面完整约束系统Lie对称性的摄动与广义Hojman型绝热不变量.首先通过一般无限小变换下的Lie对称性得到广义Hojman型的守恒量;然后基于力学系统高阶绝热不变量的定义,研究小扰动作用下系统Lie对称性的摄动,得到系统广义Hojman型绝热不变量;最后举例说明结果的应用. 关键词: 变质量 单面完整约束 对称性 摄动 绝热不变量  相似文献   
2.
This paper studies Mei symmetry which leads to a generalized Hojman conserved quantity for variable mass systems with unilateral holonomic constraints. The differential equations of motion for the systems are established, the definition and criterion of the Mei symmetry for the systems are given. The necessary and sufficient condition under which the Mei symmetry is a Lie symmetry for the systems is obtained and a generalized Hojman conserved quantity deduced from the Mei symmetry is got. An example is given to illustrate the application of the results.  相似文献   
3.
Unified symmetry of Vacco dynamical systems   总被引:1,自引:0,他引:1       下载免费PDF全文
Based on the total time derivative along the trajectory of the time, we study the unified symmetry of Vacco dynamical systems. The definition and the criterion of the unified symmetry for the system are given. Three kinds of conserved quantities, i.e. the Noether conserved quantity, the generalized Hojman conserved quantity and the Mei conserved quantity, are deduced from the unified symmetry. An example is presented to illustrate the results.  相似文献   
4.
李元成  王静  夏丽莉  后其宝  荆宏星 《中国物理》2007,16(10):2841-2844
In this paper, the unified symmetry of non-holonomic singular systems is studied. The differential equations of motion of the systems are given. The definition and the criterion of the unified symmetry for the systems are presented. The Noether conserved quantity, the Hojman conserved quantity and the Mei conserved quantity are obtained. An example is given to illustrate the application of the results.  相似文献   
5.
研究机电系统的统一对称性. 由系统的Lagrange-Maxwell方程, 给出系统的统一对称性的定义和判据, 得到了系统的统一对称性导出Noether守恒量,Hojman守恒量和Mei守恒量. 举例说明结果的应用. 关键词: 机电系统 统一对称性 守恒量  相似文献   
1
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号