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modal:modal-analysis:synthesis [2026/10/15 19:12] – [EMA Synthesis] reid_go-ci.commodal:modal-analysis:synthesis [2026/10/15 19:28] (current) – reid_go-ci.com
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 The **Synthesis** tab checks how well your modal results describe the measured data. EDM uses the modes in a saved shape to rebuild (synthesize) each FRF, then draws the synthesized FRF on top of the measured FRF. If the modes were picked well, the two curves lie close together in the frequency band that was curve-fitted. The **Synthesis** tab checks how well your modal results describe the measured data. EDM uses the modes in a saved shape to rebuild (synthesize) each FRF, then draws the synthesized FRF on top of the measured FRF. If the modes were picked well, the two curves lie close together in the frequency band that was curve-fitted.
  
-{{:modal:modal-analysis:synthesis_full_display.png}}+{{:modal:modal-analysis:synthesis_full_tab.png}}
  
 **Settings**- the shape to use, the list of its modes, the residual options, and the fit results (**Correlation** and **Error**). **Settings**- the shape to use, the list of its modes, the residual options, and the fit results (**Correlation** and **Error**).
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 **Chart**- the measured FRF and the synthesized FRF for the signal selected in the table. The upper pane shows the magnitude and the lower pane shows the phase. **Chart**- the measured FRF and the synthesized FRF for the signal selected in the table. The upper pane shows the magnitude and the lower pane shows the phase.
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-**NOTE:** Before you can use this tab, you must calculate and save at least one shape in the **Stability Diagram** tab. The measured signals that were used to calculate the shape must also still be available. Shapes that were imported from a file (for example, a UFF file) cannot be synthesized. 
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-**NOTE:** You cannot use this tab while a test is running. 
  
 ===== Choosing a Shape ===== ===== Choosing a Shape =====
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 **Shape**- Select the shape that you want to check. The list shows all the shapes saved in the current test. When you change the shape, EDM loads its measured FRFs and calculates the synthesis again. **Shape**- Select the shape that you want to check. The list shows all the shapes saved in the current test. When you change the shape, EDM loads its measured FRFs and calculates the synthesis again.
  
-When you open the Synthesis tab, EDM selects the shape that is active in the **Animation** tab.+**Note:** When you open the Synthesis tab, EDM selects the shape that is active in the **Animation** tab.
  
 **Refresh**- Updates the list of shapes, reloads the measured FRFs, and calculates the synthesis again. Use this if you have calculated a new shape or changed a shape since you opened the tab. **Refresh**- Updates the list of shapes, reloads the measured FRFs, and calculates the synthesis again. Use this if you have calculated a new shape or changed a shape since you opened the tab.
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 The **Modes** list shows each mode in the shape, for example //Mode 1 : 125.431 Hz , 1.254 %// (frequency and damping). The **Modes** list shows each mode in the shape, for example //Mode 1 : 125.431 Hz , 1.254 %// (frequency and damping).
  
-**Display poles**- When this is selected, a vertical cursor is drawn on the chart at the frequency of each mode that is checked in the **Modes** list. Click a mode in the list to check or clear it. Use the cursors to see whether each mode lines up with a peak in the measured FRF. +**Display poles**- When this is selected, a vertical cursor is drawn on the chart at the frequency of each mode that is checked in the **Modes** list. Click a mode in the list to check or clear it. Use the cursors to see whether each mode lines up with a peak in the measured FRF.  All modes are used in synthesis creation independent of if they are enabled on graphical overlay
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-**NOTE:** The **Modes** list only controls which cursors are shown. The synthesis always uses all the modes in the shape that are inside the curve-fitted frequency band. Clearing a mode does not remove it from the synthesis.+
  
 ===== Residuals ===== ===== Residuals =====
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 Both are selected by default. When you change either option, EDM calculates the synthesis again. Both are selected by default. When you change either option, EDM calculates the synthesis again.
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-FIXME **Screenshot:** The same FRF shown twice, once with the residuals selected and once with them cleared, to show how the residuals improve the fit near the ends of the band. 
-{{:ema:synthesis_residuals.png|}} 
  
 **TIP:** If the synthesized curve fits well near the modes but is offset from the measured curve near the ends of the band, make sure both residuals are selected. **TIP:** If the synthesized curve fits well near the modes but is offset from the measured curve near the ends of the band, make sure both residuals are selected.
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 These controls are not available when the table has only one signal. These controls are not available when the table has only one signal.
  
-FIXME **Screenshot:** Close-up of the signal table and the Previous signal, Run, Next signal and Speed controls. +{{:modal:modal-analysis:synthesis_signal_tab.png?}}
-{{:ema:synthesis_signal_table.png|}}+
  
 ===== Correlation and Error ===== ===== Correlation and Error =====
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 **Error**- The size of the difference between the two curves, compared with the size of the synthesized FRF. 0% means the curves are the same. Lower is better. **Error**- The size of the difference between the two curves, compared with the size of the synthesized FRF. 0% means the curves are the same. Lower is better.
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-FIXME **Screenshot:** Close-up of the Correlation and Error values for a well-fitted signal. 
-{{:ema:synthesis_correlation_error.png|}} 
  
 **What to look for:** **What to look for:**
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 **NOTE:** The **Correlation** and **Error** values are updated only when you select a signal. After you change the shape, select a signal again to update them. **NOTE:** The **Correlation** and **Error** values are updated only when you select a signal. After you change the shape, select a signal again to update them.
  
-===== Right-Click Menu ===== 
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-Right-click on the chart to open the menu. 
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-FIXME **Screenshot:** The right-click menu open on the Synthesis chart, with the Vertical Axis submenu showing. 
-{{:ema:synthesis_context_menu.png|}} 
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-**Zoom Back**- Returns to the previous zoom level. 
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-**Un-zoom All**- Returns to the full view of the chart. 
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-**Remove Cursor**- Removes one mode cursor from the chart. 
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-**Remove All Cursor**- Removes all the mode cursors from the chart. 
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-**Horizontal Axis**- Shows the frequency axis on a **Linear** or **Log** scale. 
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-**Vertical Axis**- Changes how the FRFs are displayed: 
-  * **Magnitude, dB + Phase** 
-  * **Log Magnitude + Phase** 
-  * **Magnitude + Phase** 
-  * **Real + Imaginary** 
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-**Edit Legend**- Changes the names and colors of the curves in the legend. 
  
-**Export Signal**- Saves the measured FRF and the synthesized FRF of the signal shown on the chart to a Universal File Format (''.unv'') file. Only the curve-fitted band is exported. Select a signal in the table before you use this option. 
  
 ===== FAQs ===== ===== FAQs =====