虚位移

In order to simplify the mechanical structure of the plane displacement measurement system and reduce the cost of it,this paper introduces a measurement of plane displacement system based on suppositional coordinate axis by employing optical HDNS2000 chip.

为了简化目前平面位移测量装置复杂的机械结构、降低装置的成本，文中利用HDNS2000芯片设计了一种基于虚轴的平面位移测量装置。

On the basis of the idea of partition of unity, a discontinuous function and the two-dimensional asymptotic crack-tip displacement fields are added to the displacement interpolation formula to account for discontinuity of the contact surface and stress singularity near the contact surface tip respectively. Governing equations are deduced by virtual work principle and the integral of the discontinuous functions are calculated by Gauss integral through sub-elements cut by discontinuous surface.

该方法基于单位分解思想，在位移插值形式中引入不连续函数和裂尖渐近位移场函数分别反映接触面的不连续性和接触面端点的奇异性；根据虚功原理建立有限元支配方程，接触面不连续函数积分采用分区高斯积分的方法。

Considering that body forces and surface forces were both non-conservative force, the quasi-Hamilton principle and the quasi-complementary Hamilton principle of non-conservative elasto-dynamics systems were established.

按照广义力和广义位移之间的对应关系，将弹性动力学的基本方程乘上相应的虚量，然后积分，代数相加，并考虑到体积力和面积力均为非保守力，建立了非保守弹性动力学系统的拟Hamilton原理和拟余Hamilton原理。

Compared with the existing finite element eigenanalysis method[8]for asymptotic fields near the crack tip, current method has the following several characteristics: The jump-off that educes the virtue work formula is different; when solving the characteristic formula with FEM, the form of the element is non-confirming element; the singular transformation technique is not used in the assumption of displacement fields surrounding the wedge tip.

该方法与过去的有限元特征分析方法[8]相比的显著特点是：导出虚功原理的出发点不同；有限元单元形式为非协调元；楔形体端部邻域内的位移场假定没有采用奇异变换技术。

Based on the visual work principle of structure analysis,a general formula for the displacement calculation is deduced for the static analysis of the beam on elastic foundation.

根据结构分析中的虚功原理推导弹性地基梁位移计算的一般公式，介绍了连续弹性地基梁的静力分析方法。

Based on theoretical analysis to this modulation phenomenon, two sets of linealy equations for computing 3D displacement of the virtual point sources of the reference beams and the measured object have been derived.

基于对这种调制的理论分析，导出计算参考光虚点光源和被测物体三维位移的二个线性方程组。

3 The difficulties if the curriculum: internal force calculation of combined structures; virtual work principle and displacement calculation ; displacement method; analysis of structural matrix analysis; dynamic calculation.

本课程难点：静定组合结构的内力计算，虚功原理和结构位移计算，力法，位移法，结构矩阵分析，结构的动力计算。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。