Generating a Time History from a Set of Frequency Domain Test Data

You can generate a time history....

See Also
Test Data Import Overview
About Test Data Processing
  1. From the Calibration Tools section of the action bar, click Calibration Setup .
  2. From the Test data sets section of the Calibration setup dialog box, double-click the name of the frequency domain test data feature you want to edit.
  3. [Please add details here.]
  4. Optional: Expand the Conversion parameters section and specify any of the following parameters to fine-tune the imported frequency domain data.
    OptionDescription
    Initial load rate The rate at which the specimen is loaded up to the mean strain. The default value is 0.1 strain/second.
    Initial hold time The amount of time to hold the initial mean strain before starting harmonic excitation.

    A larger initial hold time produces more excitation. By default, the initial hold is 10 times longer than the period of the first frequency to be simulated.
    Inter-frequency time The time or relative time (depending on whether you select Use relative inter-frequency timing) over which to ramp from one frequency’s mean strain to the next. The default value is 1.0.
    Use relative inter-frequency timing If selected, the interfrequency time is a fraction of the preceding frequency’s period. This option is selected by default.
    Sort frequencies Prompts the time history to run through the frequencies in order from the greatest to smallest.

    This approach causes the app to simulate frequencies with short periods when the total time value is small, which can help reduce the impact of floating-point arithmetic. This option is selected by default.
    Cycles per frequency The number of cycles to run for each frequency.

    The app calculates the storage and loss moduli from the final part of the final cycle. This number is usually sufficient to yield the steady-state stress response by the final half of the final cycle, which the app uses to calculate the storage and loss moduli. This parameter has a significant impact on performance. The default value is 2.
    Increments per cycle The number of increments taken in each cycle.

    Using a multiple of 4 ensures that the app imposes the minimum and maximum strain values for each cycle. A larger number of increments yields a more accurate stress history. This parameter has a significant impact on performance. The default value is 20.
    Increments for initial load The number of increments during application of initial mean strain. The default value is 10.
    Increments for initial hold The number of increments for holding the initial mean strain constant. The default value is 10.
    Increments between Frequencies The number of increments between each frequency’s cycling over which the mean strain is ramped between values. The default value is 10.
  5. Click .