8/12/2019 Walkthrough Example

1/5

Walkthrough ExampleStart AFPoly

by typing af pol yat the MATLAB command prompt. If an IMAT unit system has no t already been se t for the current MATLAB session, a selection dialog will be presented. After the application and modules are initialized, theAFPoly user interface appears.

Read datausing the File menu. AFPoly supports reading da ta from several different file types, or the MATLAB workspace. In this case, frequency response functions are read from the AFU file. The mode indicator functions that are plotted areselected by checking the appropriate boxes and clicking the 'Apply' button, as shown below. Specific references or responses can be disabled by se lecting them, accessing the context menu by right-clicking, and selecting 'Disable'. Thefrequency range can be selected by moving the cursors on the p lot. Simply click and drag the vertical line that runs between the horizontal arrows on the uppe r and lower edges of the plot. Other setup parameters

can also be modified, asdescribed in the reference guide.

8/12/2019 Walkthrough Example

2/5

8/12/2019 Walkthrough Example

3/5

Switch to the 'Shapes

' moduleby clicking on the 'Shapes ' tab at the bottom left of the window. A different set of responses can be se lected for the shapes than was used for the poles. This can be useful if you want to use a subset ofresponses for calculating the poles, and you want to generate shape coe fficients for all of the measured responses The frequency range can be se lected by moving the cursors on the plot, as highlighted in the figure below.

8/12/2019 Walkthrough Example

4/5

Start residues processingby clicking the 'START' button on the bottom right of the window. AFPoly switches to the Verify modulewhen completed.

Verify resultsin the Verify module. Synthesized results are compared to the measurements to evaluate the accuracy and completeness of the modal parameter estimation process. Frequency response as well as mode indicator functionscan be plotted in the Verify module. The measured functions are plotted with a no rmal-width, solid line. The synthesized functions are plotted w ith a thicker, dashed line. Poles can be disabled or enabled with the checkboxes in the PolesList. These changes are applied by clicking 'Apply' on the uppe r right corner of the w indow. Only the checked poles are included in FRF synthesis. You can easily select the function to verify by selecting from the options in the Plot Functionarea in the upper right corner of the form. The plot w ill automatically update .

8/12/2019 Walkthrough Example

5/5