Fits –Using Fit Analysis

使用Fit Analysis（拟合分析）
Fit选择/导出
Fit Select/Export(拟合选择/导出)窗口由一个阶跃响应曲线矩阵组成，在图表下方有一个图例表。 单击某个单元格以获得该单元格输入输出关系对应的Fit Stats（拟合统计数据）和整体输出Fit Stats（拟合统计数据）。Gain（增益）参数也显示在此表中。
对每一对输入-输出关系，可指定某个拟合结果作为该输入-输出对的模型。你可以同时为多个关系执行此操作。

拟合选择/导出窗口字段
Scaling（缩放）：选项包括Unit（单位）和Normalized（归一化）缩放。
当选中Unit（单位）缩放时，每个模型阶跃响应对应于输入中的单位阶跃变化，且每个单元格被缩放以独立地包含所绘的整个阶跃响应范围。
当选中Normalized（归一化）缩放时，每个模型阶跃响应对应于正常变化时的阶跃变化值。 同一列中的所有单元格具有相同的比例，并且它将按比例缩放列上的最大正负增益。
Plot Time Steps（绘图时间步长）：将阶跃响应绘制到此时间（即，每幅图的x轴范围将是0~响应时间的形式）。
Model list（模型列表）：工作区中所有模型的列表。此列表中还有一个NEW MODEL选项。 选择该选项将创建一个具有默认名称（可更改）的新模型。
Add to Model Button（添加到模型按钮）：单击此按钮将把拟合组级别的模型（使用选项创建）添加到模型。系统将出现一个对话框提示你确认将该模型添加到目标模型中。
模型合并对话框显示了所有模型（源和目标）的输入和输出，并将合适的拟合单元格显示为复选框。单个模型单元格的颜色如下：

• 白色：新（如果选中，将添加到目标模型）；
• 红色：模型选项也存在，如果选中，则将覆盖目标模型；
• 绿色：仅存在于目标模型中，并且在模型合并后不会更改。

右键单击类似于模型结构屏幕的菜单选项。
•右键单击—向右填充;
•右键单击—向下填充;
•右键单击—填充所有白色单元格（仅添加目标模型中不存在的模型）;
•右键单击—填充所有红色单元格（在目标模型中覆盖现有模型）。
如果用户未选中模型合并屏幕上的输入/输出单元格，则不会导出模型。当用户重新检查单元格，则在用户打开模型合并对话框时它输出所选中的类似的拟合。
Column Headings（列标题）：输出。
Scale Factor（比例因子）：如果选择标准化缩放，输入的比例因子将显示在输入位号名旁边的新列中。比例因子是相应输入/中间位号的正常变化。
Row Headings（行标题）：输入/中间位号。
图例
Select（选择）：对每个输入—输出关系，可通过选择分析中的某个拟合（选中复选框）来指定模型。通过取消选中复选框来取消所选择的拟合。
可通过选择多个关系单元格来选择多个关系。若要如此做，单击单元格上的鼠标左键，拖动单元格矩阵并释放鼠标按钮。所选单元格将显示不同的背景颜色。
所选拟合的阶跃响应将以粗体线型突出显示。
Color（颜色）：双击以修改模型图线颜色。

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原文：
Using Fit Analysis
Fit Select/Export
The Fit Select/Export window consists of a matrix of step response plots with a legend table below the plots. Click on a cell to obtain the Fit Stats corresponding to the input-output relationship in that cell and the overall output Fit Stat. The Gain parameter is also shown in this table.
For each input-output relationship, designate a fit result as the model for that input-output pair. You can do this for multiple relationships simultaneously.
Fit Select/Export Window Fields
**Scaling: Options include Unit **and **Normalized **scaling.
With **Unit **scaling, each model step response corresponds to a unit step change in the input and each cell is scaled to span the entire range of the plotted step responses independently.
With **Normalized **scaling, each model step response corresponds to a step change value of Normal change. All the cells in the same column have the same scale and it will scaled for the largest positive and negative gains over the column.
Plot Time Steps: Plot the step responses up to this time (that is, the xaxis for each plot will be of the form 0 – Response time).
Model list: List of all models in the workspace. There is also a NEW MODEL option in this list. Selecting this option creates a new model with a default name that can be changed.
Add to Model Button: Click this button to add the fit group level model (created using Selections) to the model. You will be prompted with a dialog box to confirm the models being added to the target model.
Model Merge dialog shows the inputs and outputs from both models (source and target) and shows the applicable fit cells as check boxes. Individual model Cell is colored as follows:
— White: New (will be added to Target Model if checked)
— Red: Exist in both Models –Overwritten if checked
— Green: Exists in Target Model only and will not be changed after the model merge.
Right-click menu options similar to the model structure screen.
• Right-click - Fill Right
• Right-click - Fill Down
• Right-click - Fill All White Cells (Add only Models that do not exist in Target Models)
• Right-click - Fill All Red Cells (Overwrite existing models in Target Model)
If user un-checks a Input/Output cell on the Model Merge screen then it is not exported. If user re-checks a cell, it exports the same fit that was selected when the user opened the Model Merge dialog.
**Column Headings: **Outputs.
**Scale Factor: **If normalized scaling is selected, the scale factors for the inputs are displayed in a new column beside the input tag name. The scale factor is the normal change for the corresponding input/intermediate tag.
**Row Headings: **Inputs/Intermediates.
Legend
**Select: **For each input-output relationship, designate the model by selecting one of the fits in the analysis (by checking the box). Unassign a selected fit by unchecking a checked box.
Make a selection for multiple relationship by selecting multiple relationship cells. To do this, click the left mouse button on a cell, drag over a matrix of cells and release the mouse button. The selected cells display a different background color.
The step response of the selected fit is highlighted in a bolder line type.
Color: Double-click to modify the model plot line color.

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2016.11.27