结构单元

It introduced fundamental functions of elastic mechnics, elastic FEM, principle of virtual displacement and the creation of structure equilibrum equation.

第二章 有限单元法原理部分，在该部分中概要介绍了弹性连续体的有限元方法，虚位移原理和结构平衡方程的建立。

Based on the variational principle of virtual voltage and virtual displacement derived in this thesis and the classical theory of linear laminated plates, and by using the constitutive equations of elastic piezoelectric materials, and the DKQ quadrilateral plate bending element, the finite element modeling for the fabric reinforced laminated plates with nonlinear voltage-electric strain relationship of piezoelectric actuators has been established for the first time in this thesis. And the expressions for the electric loadings with obvious mechanical meaning and convenient for computation are established, which can be used to the deformation analysis of laminated plates with piezoelectric actuators under specified voltages.

以本文直接导出的压电结构的虚电势—虚位移变分原理为基础，依据经典线性层合板理论和压电弹性体的本构方程，采用基于离散法线假设的DKQ四结点任意四边形薄板弯曲单元，首次建立了考虑非线性电压—电应变关系的含压电致动器的纤维增强型层合板的有限元分析模型，并推导建立了力学意义明确、便于计算的电荷载表达式，可用于指定电压条件下纤维增强型叠层合成板的变形分析。

In addition, two D-π-A alternative copolymers, P and P with thieno[3,4b]pyrazine in the backbone, were synthesized by Wittig-Horner polycondensation and applied in mecury detection.

此外，本论文还合成了两种含噻吡嗪单元的D-π-A结构的聚合物，作为荧光传感器敏感材料应用于汞离子检测。

The hierarchical structure system was calculated by means of fuzzy comprehensive evaluation theory to realize quantification of the evaluation result. Subequently, based on the solution idea of multi-object reverse problem, a method for particular solution for big/small benchmark was derived, and then a set of virtual decision making units (DMU0) was solved.

利用模糊综合评价的理论对多层结构的系统进行评价计算，实现了评价结果量化；同时，基于模糊多目标决策反问题的求解思路，推导了求解大小标杆量化特解的方法，并以此求解出一组虚拟决策单元(DMU0)。

Model a quarter of the ship section using ANSYS.Observe the Von mises stress of the structure,and history of that of identical element.

用ANSYS建立了典型舱段的四分之一模型，用LS-DYNA计算观察了结构的应力云图以及典型单元处的应力随时间的变化。

Via the function simulation of analog cell and application circuit, the structure of this type of field programmable analog array has been shown to reach the expected goal.

通过相关模拟工具对单元电路和应用电路功能的仿真，表明这种结构的现场可编程模拟阵列基本达到了预期目标。

Formula. At the same time, the article raised the seismic reduction factor formula for the SSDI system.The paper adopts finite element method based on the ANSYS procedure, and realizes the simulation of soil constitutional relationship through choosing Davidenkov soil model with proper parameters and using restartup method in ANSYS. Then, the procedure makes the soil nonlinearity simulation come true byusing parameter design language of APDL. Element Combin14 is be used to simulate viscoelastic boundary and radiation damping effect. At the same time, it presents integrated damping matrix for considering the coupling of different damping of soil and structure.

文章以ANSYS为计算分析工具和平台，通过对Davidenkov地基模型的研究及其参数的选取，利用ANSYS的重新启动分析方法并采用APDL参数设计语言来编制程序，实现对土体非线性动力本构模型的模拟；同时利用ANSYS中Combin14单元模拟粘弹性边界，以此建立人工边界来模拟辐射阻尼效应；并提出集成阻尼矩阵的方法，解决结构和地基土阻尼不同而导致的阻尼耦合的问题。

Firstly, in this thesis the characteristics of cable-reinforced membrane structures and the current analysis methods were discussed and the basic theories of traditional dynamic relaxation method were introduced in detail.

论文首先概述了索膜结构的特点以及现有的分析方法和研究现状，并介绍了传统动力松弛法的基本理论，以及单元划分方法。

The principle of piezoelectric modal sensor is introduced and the formulas of calculating modal respondence by measured piezoelectric outputs are gained.

介绍了压电模态传感器的实现原理，并给出了由实测压电单元输出得到结构模态响应的计算公式。

Structure and work principle of a hydrodynamic retarder are analyzed. A set of electronic control unit is developed aiming at the principle.

分析了液力缓速器的结构和工作原理，针对缓速器的工作原理开发了一套电子控制单元。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。