SDOFit is started from an AFPoly tool in the Poles module. The sieved FRF dataset, coordinate traces, test display model, and test-analysis model are sent from AFPoly. The default frequency range in SDOFit is set to the AFPoly stability diagram x-limits. The results returned from SDOFit are incorporated in the AFPoly stability diagram. Any coordinate traces created in the Responses dialog are also returned to AFPoly.
More than one instance of SDOFit can be running concurrently. The number of copies running at any one time is only limited by the available IMAT licenses and the memory and other resources of the computer. The startup state for SDOFit is found in the AFPoly initialization file.
The SDOFit modal parameter estimation process is organized into the three tasks: Select Function, Compute Poles, and Select Poles. Once you are finished with one task, you will progress to the next. Pushing the CANCEL button on the bottom right of the window or the [x] button on the upper-right corner of the window will close the SDOFit application without returning any results. In the Select Poles task, pushing the DONE button will return the results to AFPoly and close SDOFit. Pushing the SEND button will return the results to AFPoly but not close SDOFit.