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The main results of this study includes: 1 The stiffness and moment capacity of minor axis connected joints are related to displacement and failure mode of connection components.

弱轴顶底角钢连接作为一种典型的半刚性连接，具备良好的变形能力、一定的弯矩承载能力和钢材屈服后的塑性强化能力。

Firstly, the 3D solid model of the analyzed object is built directly in the FEM software ANSYS 8.0 without using other CAD software. The influence of the side sizes of solid elements on computing results and the influence of coupling ways between different parts on the modal parameters are researched by simply modeling. And a new connecting method about joints in ANSYS is proposed and applied to finite element modeling of the test-bed for spindle system. Furthermore, several different computing techniques for modal parameters extraction are compared in solving the finite element model of spindle system test-bed. Many modal solutions are also done to achieve the relationships between the whole or part stiffness value and computed modal parameters. The laws about joint rigid parameters" influences on modal parameters are discussed by means of altering their values for conjoint parts. And by changing local rigid parameter values, the different location selections" influence on computed modal parameters is also studied.

本文通过使用ANSYS 8.0软件直接建立研究对象的实体结构模型，而没有借助其他的CAD软件；通过构建简单的模型研究实体单元边长大小对计算结果的影响，部件之间不同的联结方式对模态参数的影响，探讨在ANSYS中实现结合部的方法，提出一种新的联结方法，并建立主轴系统试验台的有限元模型；对建立的主轴系统试验台有限元模型求解，比较几种不同模态提取方法；通过改变结合部联结单元的刚度参数进行的计算，寻找联结刚度对模态参数变化的影响规律；改变局部联结单元的刚度参数，研究刚度值位置差异对计算模态参数的影响。

For identical shapes, the stiffness is proportional to the modulus of elasticity.

对于同样形状的材料，刚度与弹性模量是成比例的。

The slope of this straight line is known as the modulus of elasticity or Young's modulus,which is an indication of the stiffness of the material.

该直线的斜率称为这种材料的弹性模量或杨氏模量，它表示这种材料的刚度。

In the natural sensitivity analysis to consider the impact of three different factors: the rotor moment of inertia, the water wheel attached to the moment of inertia and rotor arm stiffness.

在自振敏感性分析中考虑了三种不同影响因素：转子转动惯量、水体对转轮附加转动惯量和转子支臂刚度。

Wave equations, which were derivate from the stiffness Matrix of anisotropy monocline symmetry system, may meet different azimuth modeling of 2-D finite difference.

从各向异性单斜对称系统的刚性矩阵推导出的波动方程，可以满足EDA介质模型不同方位角入射的二维差分模拟要求。

The comparison of results shows that the affection of second-order effect and the change of stiffness changing point should be noticed when designing and analysing multistory composite frame.

各种计算结果的比较说明，多层组合框架的设计分析应重视二阶效应和刚度突变分界点变化的影响。

Multistory frames with semi-rigid connections of different initial stiffness are constructed together with the corresponding rigid frame.

建立了具有不同节点初始刚度的半刚接多层钢框架及相应刚性框架的计算模型。

Another feature of this syndrome is delayed muscle relaxation, which differs from true myotonia by absent percussion myotonia and increased rather than decreased stiffness during continued activity.

Isaacs综合征的另一个特点是肌肉松弛延缓。1。 Isaacs综合征患者，无叩击性肌强直；2。持续活动期间，肌强直加剧而非减轻。

Natural materials such as bone, tooth, and nacre are nano-composites of proteins and minerals with superior stiffness and toughness.

骨骼、牙齿和珍珠等自然材料都是以蛋白质和矿物质为基本组成的、具有极高刚度和韧性的纳米复合材料。

In the days of sailing vessels the crew were afraid they would be becalmed on the ocean.

在使用帆船的时代，船员们担心他们会因为无风而无法在海洋上航行。

As long as foreign donors pay the PA's salary bill, few expect a new intifada.

只要外国继续为巴权力机构的薪水买单，希望发动新暴动的人便寥寥无几。