Frequency Domain Statistics allows you to view text statistics in the graphical view for a Frequency Statistical Analysis.
Statistics are available by clicking the Properties tab at the bottom of the graphical view.
In the Details panel, select the Statistical Measure that you would like to display. By default, each statistic shown will be a Significant Value (Amplitude); alternatively, each value can be scaled as a Probable Maximum, a Median Maximum, an Expected Extreme, or a Percentile Extreme. The scaling requires a Duration for Maximum Value Estimates to be defined, and when you choose to display each statistic as a Percentile Extreme, the Percentile must also be specified. The Calculated Zero Crossing Period is automatically determined from the Irregular Wave spectra defined for the analysis. See Significant Value Calculation in the Aqwa Theory Manual for more information.
Note:
Statistical values are calculated under the assumption that the corresponding response spectra are Rayleigh-distributed, and that the zero crossing period of the response is similar to the zero crossing period of the defined Irregular Wave spectrum.
The zero crossing period calculated by Aqwa may not match the zero crossing period defined within an Irregular Wave, because the wave spectrum may not exactly fit a Rayleigh distribution.
Next, select a Result Type in one of the Result A-E fields. You can select from Motions, Joint Reactions, Cable Forces, or Fender Forces.
Each of the Result A-E sets includes a Result Source selection. Where there are multiple Frequency Statistical Analysis systems in the Outline tree, you may select any as a Result Source for the current Result Set. This allows results from similar Frequency Statistical Analyses – for example, structure significant motions under different environments – to be compared in the same table of statistics.
When a result type is selected, the Result object will expand with further information in the Details panel.
For a Motions result, select an active Structure from the current model and a Reference Point on the structure where the results should be reported.
If the Reference Point is a Connection Point, you may use the Motion Relative To field to specify whether the motions are relative to the Wave Surface. Otherwise, the motions will be reported in the axis system defined by the Axis System for Motion Statistics and Nodal Response option in Analysis Settings. In addition to the conventional motion properties, the statistical values of the translational effective acceleration are also reported (see 27.4. The ALLM Data Record - All Motions). If the data is not available in the Aqwa database (due to the resumption of a previous Aqwa Workbench project or removing the ACEF option), N/A will be displayed both in the table in the graphical window and the Property View of the current solution in the Aqwa Editor. In the former case, users need to solve the solution again to access these values.
For Joint Reactions, Cable Forces, and Fender Forces, you should specify a Joint, Cable, or Fender from the current model, respectively.
Results also appear in the Properties view, and are included in the text summary of the report.
Note: You can include any of the results in your design points by clicking the check box next to the result in the Details panel. However, output values can only be parameterized when their Result Source is defined as the current analysis system.
Caution: When the selected Result Type is Motions, and the selected Reference Point is a Connection Point, the Include in Results option for that Connection Point must be set to Yes before the analysis is performed. Connection Points for which the Include in Results option is set to No are not available for use as a result Reference Point in a Frequency Domain analysis.