In the Compute Poles task, the number of modes, the residual orders, and the frequency band around the mode of interest are selected. The FRF that is plotted is the function selected for parameter estimation and cannot be changed in this task. Information about the FRF dataset is displayed in the Info panel. Hovering the mouse pointer over AFU Name will show some additional information about the FRF dataset.
The START button at the bottom-right corner of the GUI starts the parameter estimation processing. The algorithm is evaluated first for no residuals, then for residuals orders of +/-1, +/-2, etc. SDOFit proceeds to the Select Poles task when completed. The STOP button will stop the parameter estimation processing and no results will be returned. There is also a context menu on the Compute Poles radio button from which to start processing.
Poly Model : Number of Modes – Enter the number of modes to be computed. Entry must be a positive integer greater than or equal to one.
Poly Model : Residuals Order – Enter the range of residual orders to be evaluated in the algorithm. Entry must be a positive integer.
Poly Model : Default Selected – Select the default residuals order that is selected after the poles are computed.
Freq Range : Lower & Upper Freq – Enter the lower and upper limits of the frequency range to be processed. These values can also be set using the two cursors in the plot axes. There is a context menu on the edit boxes from which to set the full frequency range.