桁架杆

By comparison with the theoretical solution and published results, the efficiency and practicability of the algorithm are confirmed.

在此基础上，选用经典10杆桁架结构对该算法的寻优能力进行了验证。

The previous applications of Hopfield model were restricted to problems with 0-1 discrete design variables and liner programming problems.

本文进一步探讨了Hopfield网络求解约束非线性优化问题的方法，并将其应用于4杆桁架的结构优化设计。

Stiffness matrix of an elementary bar and total stiffness matrix were deduced and the program for 3D-truss analysis was developed using Fortran computer language according to flow chart of finite element analysis.

作者在有限元理论的基础上，推导了杆单元的单元刚度矩阵和总体刚度矩阵，并根据有限元分析流程，用FORTRAN语言编制了三维桁架结构的有限元分析程序模块。

The balancing condition of plane joint-force system is that force polygon must be closed.The graphic solution and AUTO CAD tool of computer can be applied to obtain two forces on a nodepoint fast and accurately,then internal force of truss can be obtained.

摘 要 一个平面汇交力系的平衡条件是其力多边形必须闭合，依其条件，利用图解法和计算机中的AUTO CAD绘图工具，迅速准确地求解一个结点上的两个未知力，并以其类推求解桁架各杆内力。

But it is inaccurate to ignore the effect of joint's local translational stiffness and consider it as an ideal hinge joint.

本文针对方管桁架节点连接的平动刚度，提出了串联弹簧的杆单元来建立计算模型。

The results analyzing the rtuss as rigid joint or hinge joint in theory are indicated that the tube truss in practice is accordance well with the theoretical calculation as rigid joint or hinge joint ,if axes joint of web members are at center of chord members.

通过对一榀 2 4m跨钢管屋架的静力试验研究及在理论上按刚接、铰接的计算结果分析表明，腹杆轴线交点与弦杆形心重合的管桁架，按刚接或铰接计算与实际受力状态均符合较

In the program the Newton-Raphson's method is used to iterative computation; and the method of either the cylinder-arc-length or the minimum residual displacement is adopted to control the iterative process.

在分析非线性静力和动力有限元计算方法的基础上，本文采用修正的Newton-Raphson方法进行迭代计算，并采用柱面弧长法和最小残余位移法控制迭代过程，编制了一个适合于杆件体系结构的有限元分析程序，结构可以按桁架、刚架或梁杆组合体系分析。

Distinguishing methods of various zero members i n special node s are summarized as well as the method how to utilize the symmetry of structure to build local coordinate system correctly for simplified internal force calculation of plane truss.

归纳了特殊结点中各种零杆的判别方法，总结了如何正确地建立坐标系和利用结构的对称性，以便达到简化平面桁架内力计算的目

On the basis of the improved structure and under the premise of meeting specification requirement, the light steel door-truss structure is optimally designed by changing, cycle checking and gradually reducing the cross section size of overall structural member with the ANSYS parametric design language. The mechanical properties such as changes in stiffness, strength and stability of the optimized structure are completely analyzed under three load cases.

基于改进结构，在满足相关规范的前提下，利用ANSYS软件的参数化命令流语言（ANSYS parametric design language， APDL），通过改变结构杆件截面尺寸，对整体结构杆件的截面采用循环校核、递减尺寸，并对轻钢门式桁架结构进行优化设计，分析了优化结构在3种荷载工况组合条件下的整体刚度、强度及稳定性等力学性能的变化，给出了改进前后与优化前后结构的力学特性对比。

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 split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。