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Line Statistic 缆索静态模拟(orcaflex)


Line Statistic When you do a static analysis OrcaFlex does static analyses for each line in the model.
The lines are analysed in the order they appear in the by types view of the model b

rowser. So if you are having a problem with the static analysis of a particular line, and there are a lot Note: of lines in the model, then you can make investigation of the problem easier by dragging the line up to the top of the list in the model browser.

The static analysis of a given line has two steps:

Line Statics Step 1
The first step calculates a configuration of the line (i.e. positions for all the nodes on the line), using the method specified on the line data form (either Catenary, Spline, Quick, Prescribed, or User Specified).

Line Statics Step 2
The second step, which is optional, is called Full Statics. If Full Statics is included, then it calculates the true equilibrium position of the line. The calculation is iterative and hence it needs a starting configuration – for this it uses the configuration found by step 1. If Full Statics is not included, then the line is simply left in the configuration found by step 1, which (depending on the method chosen) may not be an equilibrium position.

Unstable equilibria
Sometimes Line Statics Step 2 finds an equilibrium configuration that is unstable. Everyday examples of unstable equilibria include balancing a coin on its edge or balancing a pencil on its tip. Very occasionally OrcaFlex statics converges on an unstable equilibrium. An unstable equilibrium can usually be detected by the presence of large curvature spikes on a range graph. Typically a dynamic run will excite the line enough to kick it out of the unstable equilibrium. However, statics and dynamics results from such unstable equilibria are invalid.

当你做一个静态分析 OrcaFlex 的静态分析模型中的每一行。 注:该行的分析类型视图模型浏览器中的显示顺序。所以,如果你有一个问题,与静态分析 的一个特定的行, 并在模型中有很多行, 那么你就可以更容易使问题的调查拖动到列表顶部 的模型中,浏览器。 一个给定的行的静态分析有两个步骤: 行静步骤:1 步骤 1 计算的配置线(即上线的所有节点的位置) ,使用规定的方法就行了数据的形式(无 论是接触网,花键,快速,规定,或用户指定) 。 行静步骤 2 第二步骤中,这是可选的,被称为全面静力学。如果全静,然后计算该行的真正平衡位置。 是重复计算,因此它需要一个启动配置 - 它使用第 1 步中找到的配置。如果全静不包含, 则该行被简单地留在由步骤 1 中, (取决于所选择的方法)可能不是一个平衡位置发现的配 置。 不稳定的平衡 有时行静第 2 步找到一个平衡点是不稳定的配置。不稳定的平衡点,包括日常生活中的例 子,在它的边缘平衡硬币, ,或平衡铅笔在前端。 很偶然的 OrcaFlex 静收敛于一个不稳定的平衡。不稳定平衡通常可以被检测到的存在的范 围内图上的曲率大的尖峰。 通常情况下, 动态运行, 会激发的线足以踢出来的不稳定的平衡。 然而,从这种不稳定的平衡的静力学和动力学结果是无效的。


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Line Statistic 缆索静态模拟(orcaflex)
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