使用Fit Analysis（擬合分析）
Fit選擇/導(dǎo)出
Fit Select/Export(擬合選擇/導(dǎo)出)窗口由一個階躍響應(yīng)曲線矩陣組成，在圖表下方有一個圖例表。 單擊某個單元格以獲得該單元格輸入輸出關(guān)系對應(yīng)的Fit Stats（擬合統(tǒng)計(jì)數(shù)據(jù)）和整體輸出Fit Stats（擬合統(tǒng)計(jì)數(shù)據(jù)）。Gain（增益）參數(shù)也顯示在此表中。
對每一對輸入-輸出關(guān)系，可指定某個擬合結(jié)果作為該輸入-輸出對的模型。你可以同時為多個關(guān)系執(zhí)行此操作。
擬合選擇/導(dǎo)出窗口字段
Scaling（縮放）：選項(xiàng)包括Unit（單位）和Normalized（歸一化）縮放。
當(dāng)選中Unit（單位）縮放時，每個模型階躍響應(yīng)對應(yīng)于輸入中的單位階躍變化，且每個單元格被縮放以獨(dú)立地包含所繪的整個階躍響應(yīng)范圍。
當(dāng)選中Normalized（歸一化）縮放時，每個模型階躍響應(yīng)對應(yīng)于正常變化時的階躍變化值。 同一列中的所有單元格具有相同的比例，并且它將按比例縮放列上的最大正負(fù)增益。
Plot Time Steps（繪圖時間步長）：將階躍響應(yīng)繪制到此時間（即，每幅圖的x軸范圍將是0~響應(yīng)時間的形式）。
Model list（模型列表）：工作區(qū)中所有模型的列表。此列表中還有一個NEW MODEL選項(xiàng)。 選擇該選項(xiàng)將創(chuàng)建一個具有默認(rèn)名稱（可更改）的新模型。
Add to Model Button（添加到模型按鈕）：單擊此按鈕將把擬合組級別的模型（使用選項(xiàng)創(chuàng)建）添加到模型。系統(tǒng)將出現(xiàn)一個對話框提示你確認(rèn)將該模型添加到目標(biāo)模型中。
模型合并對話框顯示了所有模型（源和目標(biāo)）的輸入和輸出，并將合適的擬合單元格顯示為復(fù)選框。單個模型單元格的顏色如下：
- 白色：新（如果選中，將添加到目標(biāo)模型）；
- 紅色：模型選項(xiàng)也存在，如果選中，則將覆蓋目標(biāo)模型；
- 綠色：僅存在于目標(biāo)模型中，并且在模型合并后不會更改。
右鍵單擊類似于模型結(jié)構(gòu)屏幕的菜單選項(xiàng)。
?右鍵單擊—向右填充;
?右鍵單擊—向下填充;
?右鍵單擊—填充所有白色單元格（僅添加目標(biāo)模型中不存在的模型）;
?右鍵單擊—填充所有紅色單元格（在目標(biāo)模型中覆蓋現(xiàn)有模型）。
如果用戶未選中模型合并屏幕上的輸入/輸出單元格，則不會導(dǎo)出模型。當(dāng)用戶重新檢查單元格，則在用戶打開模型合并對話框時它輸出所選中的類似的擬合。
Column Headings（列標(biāo)題）：輸出。
Scale Factor（比例因子）：如果選擇標(biāo)準(zhǔn)化縮放，輸入的比例因子將顯示在輸入位號名旁邊的新列中。比例因子是相應(yīng)輸入/中間位號的正常變化。
Row Headings（行標(biāo)題）：輸入/中間位號。
圖例
Select（選擇）：對每個輸入—輸出關(guān)系，可通過選擇分析中的某個擬合（選中復(fù)選框）來指定模型。通過取消選中復(fù)選框來取消所選擇的擬合。
可通過選擇多個關(guān)系單元格來選擇多個關(guān)系。若要如此做，單擊單元格上的鼠標(biāo)左鍵，拖動單元格矩陣并釋放鼠標(biāo)按鈕。所選單元格將顯示不同的背景顏色。
所選擬合的階躍響應(yīng)將以粗體線型突出顯示。
Color（顏色）：雙擊以修改模型圖線顏色。
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.
2016.11.27
