| 1. | Let the junction of the three fracture lines have a virtual displacement .
令三条折断线的相交处有一虚位移。 |
| 2. | We recall that the principle of virtual displacements is a statement of equilibrium .
前面已叙述过，虚位移原理是对平衡的一种描述。 |
| 3. | The virtual displacement method specifies that the sum of the shaded areas is equal to the sum of the stippled areas .
虚位移法规定阴影面积之和等于点画面积之和。 |
| 4. | Principle of virtual displacement
虚位移原理 |
| 5. | This paper employs the dynamic - static force principle to simplify the mathematical models , and employs the virtual - displacement principle and adopts the sor digital algorism to extract the dynamical performances . the solutions extracted is coincidental with the practical situations
本论文应用了达朗贝尔原理简化数学模型，并应用虚位移原理和sor迭代法求解机构的动力特性，求得的仿真曲线与实际情况比较吻合。 |
| 6. | ( 2 ) to determine the worst load case accurately and quickly , influence faces of main sections are plotted < > ( 3 ) combining the influence face with the pre - reinforcement space fe model , the internal force and the stability are computed , then the main reasons of the disease are analyzed
( 2 )为准确快速地确定最不利荷载工况，运用虚位移原理和边界元相结合的新方法，绘制了主要检算截面的内力影响面。 ( 3 )应用空间有限元模型，结合内力影响面，对加固前进行内力和稳定性计算，分析其主要的病害原因。 |
| 7. | This dissertation studies the problem of dynamics modeling , dynamical response , and distribution of moving mass for a re - entry vehicle ( mmcrv ) under the background of national natural science fund project “ precision control and guidance for moving mass control of a re - entry vehicle based on the virtual displacement concept ”
本论文以国家自然科学基金项目“基于虚位移概念的变质心再入飞行器精确制导问题研究”为背景,研究基于变质心控制的再入体动力学建模、动力学响应和落点分布等问题。 |
| 8. | Abstract : this article deduces the calculation formulation of jointless - track ' s stability using the theorem of bogus - locomotion , and calculates the influences of the changes of various parameters on jointless - track ' s stability and suggests some important principles of keeping jointless - track ' s stability in the process of maintaining jointless - track
文摘:利用虚位移原理推导了无缝线路稳定的公式，计算了各种参数的变化对无缝线路稳定的影响，提出了在线路养护工作中保证稳定的一些重要原则。 |
| 9. | They are studied that the nonlinear problem and un - determinate problem of virtual displacement in nonholonomic system in the second chapter . in chapter 3 , they are studied that chetaev model and vacco model in nonholonomic system . a unified form of hamilton principle in intrinsical linear nonholonomic system is studied in chapter 4
第一章对非完整动力学研究的有关现状进行了综合评述；第二章研究了非完整系统虚位移关系的不定性问题与非线性问题；第三章比较研究了一般非完整系统的chetaev模型和vacco模型；第四章研究了本质线性非完整系统的hamilton原理；第五章给出了本文的结论与有关研究的展望。 |
| 10. | The rational spectrums of all kinds of virtual displacement definitions and commutativity of d , ? operations are given and testified in this paper . the research methods of intrinsical linear nonholonomic dynamics are similar to those of holonomic dynamics . the rationality and equivalence of chetaev model and vacco model in the intrinsical linear nonholonomic system are testified from the mathematic and mechanical aspects
本文研究了非完整动力学中使不定性问题确定化的交换关系和将非线性问题线性化的虚位移定义，首次证明并给出了在非完系统中各种虚位移定义与交换关系的合理适用范围，指出完整动力学与本质线性非完整动力学在研究方法上具有相同性。 |
