教学研究

浅谈变分原理及其一些应用

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  • 1. 北京交通大学 数学与统计学院,北京100044; 2.内蒙古民族大学 数理学院,内蒙古 通辽028043
郑神州(1965—),男,浙江临海人,北京交通大学教授,博士,主要从事大学数学物理方法教学和偏微分方程研究工作.E-mail:shzhzheng@bjtu.edu.cn

收稿日期: 2023-01-14

  修回日期: 2023-02-28

  网络出版日期: 2023-11-06

基金资助

国家自然科学基金项目(12071021);北京交通大学研究生课程建设项目(134001103522)资助

A brief discussion on variational principle and some applications

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  • 1. School of Mathematics and Statistics, Beijing Jiaotong University, Beijing 100044, China; 
    2. School of Mathematics and Physics, Inner Mongolia University for Nationalities, Tongliao, Inner Mongolia 028043, China

Received date: 2023-01-14

  Revised date: 2023-02-28

  Online published: 2023-11-06

摘要

给出了变分原理的基本形式以及变分极值的欧拉-拉格朗日方程的推导,其次以短程线、测地线、最速降线和等周问题为例,分别推导出各具体形式的欧拉-拉格朗日方程表示式,并对相应原问题给出求解过程以及各种相关的推广. 

本文引用格式

郑神州, 于海燕 . 浅谈变分原理及其一些应用[J]. 大学物理, 2023 , 42(10) : 1 . DOI: 10.16854/j.cnki.1000-0712.230014

Abstract

 The variational principle is introduced, and its Euler-Lagrange equation for the minimum of variational problems in the setting of one dimension is described. Then, the corresponding specific expression of these Euler-Lagrange equations for taking a geodesic line, geodesic curve, Brachistochrone and isoperimetric problems are deduced as examples, respectively. The solutions of the corresponding original problems are obtained and the relevant generalizations are given.

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