Fits~ Overview –FIR Fit Setup Su
FIR Fit设置子选项卡
FIR Fit设置子选项卡是设置和运行非参数FIRFit的选项卡。其提供了关于数据集和所选择模型结构质量的第一反馈。在所有的后续图表中，此第一个模型被称为“FIR”模型。
FIR Fit设置子选项卡字段和按钮
Compute Confidence（计算置信度）：如果要计算FIR模型95％置信区间带，请选中此复选框。
Perform Fit Button(执行Fit按钮) :运行非参数拟合。
Row Headings(行标题):输入和中间变量。
Column Headings(列标题) :输出。
Ramp（斜坡）:指示输出为斜坡变量。
Dead-time(死时间)：FIR模型预测的死时间; 默认0; 使用Fill Down（向下填充），Fill Right（向右填充）和Fill All（全部填充）选项用当前单元格值填充到多个死时间单元格。
Settling-time(设定时间)：相应输入输出关系设定时间的猜测。默认值为Workspace选项中设置的值; 使用Fill Down（向下填充），Fill Right（向右填充）和Fill All（全部填充）选项用当前单元格值填充到多个设定时间单元格中。 在闭环辨识时要仔细检查设定时间。 太长的设定时间有时会恶化闭环情况下的估计质量。
FIR Fit绘图子选项卡
当拟合完成后，其结果将以阶跃响应图的形式显示在FIR Fit图子选项卡上。 此子选项卡还显示了FIR拟合的近似参数结果。如果选择了计算FIR模型的置信带，它们也将在此窗口中看到。在后续的所有图中，参数近似模型被称为“F2P”模型。
我们推荐用户使用该子选项卡试验不同的参数模型类型（一阶，二阶等）以最佳地匹配FIR拟合结果。 这为参数模型拟合提供了最佳的初始化。
FIR Fit图子选项字段和按钮
Plot Time Steps（绘制时间步）：绘制阶跃响应直到此时间（例如，每个图的x轴将为0~响应时间）。
Show Confidence（显示置信区间）：显示计算的置信区间。
Redo Fit（重新拟合）：重新进行FIR设置和拟合。
Initialize Parametric（初始化参数）：使用这些参数近似作为参数拟合的初始输入。结果和约束将复制到Parametric Fit（参数拟合）选项卡窗口。
Row Headings(行标题)：输入和中间变量。
Column Headings(列标题):输出。
原文：
FIR Fit Setup Subtab
The FIR Fit Setup subtab is the tab where a non-parametric FIR fit is set up and run. This provides the first feedback as to the quality of both the datasets and of the model structure selected. This first model is nicknamed the “FIR” model on all subsequent plots.
FIR Fit Setup Subtab Fields and Buttons
**Compute Confidence: **Select this checkbox if you want the FIR model 95 percent confidence interval bands computed.
**Perform Fit Button : **Run the non-parametric fit.
**Row Headings: **Inputs and Intermediates.
Column Headings : Outputs.
Ramp : Indication that the output is a ramp variable.
**Dead-time: **Dead-time guess for FIR model; default 0; use the Fill Down, Fill Right, and Fill All options to fill multiple dead-time cells with the current cell value.
**Settling-time: **Settling time guess corresponding to the input-output relationship. Defaults to value set in Workspace Options; use the Fill Down, Fill Right, and Fill All options to fill multiple settling-time cells with the current cell value. Check the settling-time carefully during the closed-loop identification. Too long settling time will sometimes deteriorate the estimation quality in the closed-loop case.
FIR Fit Plots Subtab
Once the fit is complete, the results are displayed as step-response plots on the FIR Fit Plots subtab. This subtab also shows the results the parametric approximation of the FIR fit. If the confidence bands of the FIR model were selected to be computed, they will also be seen in this window. The parametric approximation model is nicknamed the “F2P” model in all subsequent plots.
It is expected that the user uses this subtab to experiment with different parametric model types (first order, second order, etc) to best match the FIR fit results. This provides the optimal initialization for the parametric model fit.
FIR Fit Plots Subtab Fields and Buttons
**Plot Time Steps: ** Plot the step responses up to this time (for example, the x-axis for each plot will be form 0 –Response time).
Show Confidence: Display any computed confidence bands.
Redo Fit: Redo the FIR setup and fitting.
Initialize Parametric: Use these parametric approximations as initial input for the parametric fit. The results and constraints are copied to the Parametric Fit tab window.
**Row Headings: **Inputs and intermediates
Column Headings: Outputs.
2016.11.15
