结构单元

Then the element equation and unit tangent rigid matrix are deducted on the basis of description of UL coordiate and principle of imaginary, the balance equation and overall tangent rigid matrix are integrated via introduction of terminal condition, and the nonlinear equation group is finally parsed on the basis of combination method of Newton-Raphson and increment.

接着基于U.L 坐标描述，从虚功原理出发推导出单元的平衡方程和单元切线刚度矩阵，引入边界处理条件集成了整体结构的平衡方程和总切线刚度矩阵，并采用Newton—Raphson 法和增量法相结合的方法求解非线性方程组。

In the fourth chapter, using the magnetic vector potential as the unknown variable, a mathematical model for numerical calculation of the magnetic field and loss distribution in 3-phase 5-limb transformer core is presented.

第三章针对变压器铁心结构的特点，对各向异性非线性边值问题的有限元分析方法进行了详细的阐述，并推导出了实用的N-R格式及单元分析格式，对具有多媒质单元的有限元分析方法进行了介绍，为变压器铁心磁场及损耗分布的数值计算奠定了基础。

This cell is very simple and could work under conditions of very high frequency and low power consumption.

基于这种技术设计了一个2/3分频器单元，该单元结构简单，工作频率高，功耗低。

In this model, axial yarns, braider yarns and resin were treated as spatial beam elements. Each unit cell is then treaded as space truss.

其中，轴纱、编织纱和基体均被视为两端铰接的空间杆单元，复合材料用离散的杆单元组成的桁架结构代替。

The element is based on the Reissner-Mindlin plate bending theory and is eccentrically stiffened with beam element.

采用非等参插值的方法避免了Mindlin板／壳单元用于分析薄板／壳结构时固有的剪切锁死问题，数值算例结果表明，该单元对与薄板和厚板均给出了精确的解。

Incurrent research, aiming at the rupture problem engendered in the shooting process of acertain 5.56mm automatic rifle, the strain and stress distributions on the cartridge caseunder the action of axial pull have been analyzed. Based on the theories of elastic-plasticmechanics and contact mechanics, a mathematic and physical model of the cartridge-caseand chamber system has been set up; and based on the platform of the general softwarepackage APDL of ANSYS for finite element analysis, a parameterized model of thecartridge-case and chamber system has also been established. The method for nonlinearFEA has been adopted to analyze the stress distribution on the entire cartridge-case andchamber system, and the method of contact element has been employed to investigate thecontact stress between the cartridge case and chamber, and then the influences of frictioncoefficient and locking space on the static and dynamic stress and strain response of thecartridge case and chamber to the action of power gas have also been discussed. On thebasis of a lot of numerical tests, a kind of element Plane13, which is concentrated incoupled computation of heat and construction, has been used finally to simulate thetransient response of the cartridge-case and chamber system to the power gas. Throughloading the temporary thermal characteristics of explosive gas in the procedure of emulate, the corresponding transient thermal stress distributed on the entire system under thecombined load of transient thermal stress and transient pressure has been obtained. Owingto these comprehensive considerations, the numerical results obtained in this paperrepresent the actual situations comparatively exactly.

本文针对某5.56mm自动步枪在工作中出现断壳的问题，分析了弹壳在轴向拉力作用下的应力应变；基于弹塑性力学及接触理论，建立了弹壳弹膛系统的数学、物理学模型，在通用有限元ANSYS软件的参数化建模工具APDL平台上，建立了弹壳弹膛系统的参数化模型；采用非线性有限元法计算了弹壳弹膛系统的整体应力，引入接触单元法分析弹壳和弹膛的接触压力，探讨了在不同的摩擦系数和不同的闭锁间隙对弹壳弹膛静、动态响应的影响；本文进行了大量的尝试，最后确定采用热、结构耦合单元Plane13，在计算中加载了火药气体的温度历程，成功的获得了弹壳弹膛系统在瞬态的热载荷和瞬态的压力载荷同时作用下弹壳弹膛系统的热应力数值解，考虑因素全面，比较真实的反映了弹壳弹膛系统在火药气体压力和热载荷下作用的情况。

In this dissertation, the moderately thick plate which works as transfer layer in" JinChao Mansion"in Hangzhou is analyzed by 3 dimensional solid finite element and the 9node mixed plate bending element. Several computation models for the transfer plate and the axial deformations of the columns and ahear walls which support the plate are considered in the analysis.

文中用三维实体单元和九节点混合板弯曲单元对杭州&金潮大厦&厚板结构转换层进行了分析，分析中考虑了多种计算模型，并用弹性支承近似地考虑了支承转换板的柱和剪力墙的轴向变形，文中给出了大量的图表。

Because it is a portlet, it automatically determines the navigational structure of the page it is included on, and displays it accordingly.

这个门户单元可以自动侦测门户系统所包含的各单元及结构，并相应的显示给使用者。

Don Hara. etc species for agricultural objects, and Eucommia ulmoides, Pterocarya stenoptera, Sinocalamus affinis etc species for reforestation objects.

通过土地单元间农林复合系统土壤呼吸以及土壤水分、养分等常规测定，筛选出林地—经济林—梯地、坡耕地—林地—经济林2种拓扑结构的土地单元间农林复合系统，并提出了生物带、生物埂功能调控技术。

In SNA, a request unit sent only in reaction to a received request unit; for example, Quiesce Complete is the reply sent after receipt of Quiesce At End of Chain.

在系统网络体系结构中，仅对接受的请求单元进行反馈时发送的一种请求单元。例如，在接受了&链结束停顿&后发送&停顿完成&应答。

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。