variation principle

In this paper, the nil principle and its variation are introduced.

本文介绍了“无”原理及其变易.

Describes the constitution and principle of osteoporosis therapy system, the core part of which is a magnetic field coil made up of variation Helmholts coil.

本文介绍了骨质疏松治疗系统的组成及工作原理。系统核心部件是治疗磁场线圈，采用变异的亥姆霍兹线圈研制而成，性能优良。

With the help of variation method, virtual work principle and cubic hermite element, the author puts forward a finite element method to solve the problem of beam vibration on elastic foundation.

本文应用变分形式、虚功原理、Hermite三次元，提出弹性地基梁振动问题的有限元方法。

Firstly, differential variation principle of human body non-integrity system mechanics and integral principle of human body integrity system mechanics were expounded.

首先，阐述了人体非完整系统力学的微分变分原理和人体完整系统力学的积分原理；

At last, a model example is supplied by the finite element method which is combined by variation principle and piecewise polynomial interpolation.

文章最后利用变分原理和分片多项式插值相结合的有限元法，给出了一个典型算例。

Through cutting experiments in which the contact length between chip and rake face of restricted contact cutter is reduced step by step, the variation principle of cutting force is studied.

通过切削试验，研究了限制接触刀具前刀面的刀&屑接触长度逐渐减小时切削力的变化规律。

Analysis of Free Vibration Characteristics of Thin-walled Box Girder Based on Energy Variation Principle

基于能量变分原理的薄壁箱梁自振特性分析

Besides, the general variation principle was introduced to solve electromagnetic problem in lossy media.

同时由于广义变分概念的引入, 可使泛函的变分原理应用于有耗媒质电磁场问题.

The constituent, working principle of AGC system and the spring curve of rolling mill were introduced. The reasons for variation of thickness deviation in longitudinal direction were analyzed in detail, and the corresponding solutions were put forword.

介绍了液压AGC控制系统的组成、工作原理及轧机的弹跳曲线，详细分析了带材在纵方向上造成厚差波动的原因，并提出解决方案。

Ray equation is derived from Fermat's principle in variation form.

本文由费马原理的变分形式,导出光线微分方程.

Reform in the Graduate Course Variation Principle and Finite Element

研究生课程变分原理与有限元改革初探

Based on the continuity equation of ground water and the variation principle, the seepage differential equation can be acquired.

根据地下水的连续方程和变分原理建立渗流场微分方程。

The work principle of belt tensioning device is explained. Power source incorporating accumulator can damp pressure variation of the system, hence to keep the stable tension of the belt.

说明了皮带自动张紧装置的工作原理，带蓄能器的动力源能缓冲系统压力变化，从而使皮带的张紧力保持稳定。

Analysis on the variation principle of thermal cycle and stress in the laser overlapping area

激光扫描搭接区内的热循环与应力变化规律分析

The variation principle in semi-metric space and Application

半度量空间中变分原理及应用