Create Channels

Create or import channels (load histories).

Load history headers cannot be renamed. Blocks of the load history file can be renamed.

Add Time Data Loads

Time data loads are available for the Time Series loading type.
  1. Click the Load Map tool.
    Figure 1.


    The Load Map dialog opens.
  2. Select Time Data from the Channel Type drop-down menu in the top-left of the dialog.
  3. In the Choose file field, click and browse for files.
    Accepted file formats are: .rpc/.rsp, .csv, and .dac
  4. Click to add the load case(s).
  5. Optional: Edit the maximum and minimum values of the loads.
  6. Optional: Click to view a plot of the load.
    Figure 2.


Add Constant Amplitude Loads

Constant amplitude loads are available for the Time Series loading type.
  1. Click the Load Map tool.
    Figure 3.


    The Load Map dialog opens.
  2. Select Constant Amplitude from the Channel Type drop-down menu in the top-left of the dialog.
  3. Click to add the load case.
    Tip: Click in the Channel Name field to rename the load case.
  4. Optional: Edit the maximum and minimum values of the load.
  5. Optional: Click to view a plot of the load.
    Figure 4.


Add Block Loads

Create a block series of various amplitudes. Each block can have "n" number of cycles.
Block loads are available for the Time Series loading type.
Figure 5. Sample CSV Format


  1. Click the Load Map tool.
    Figure 6.


    The Load Map dialog opens.
  2. Select Block Loading from the Channel Type drop-down menu in the top-left of the dialog.
  3. Click .
    The Block Load dialog opens.
  4. Specify a name for the block load.
    Tip: Click in the Channel Name field to rename the load case.
  5. Specify the number of blocks to create then .
  6. Edit the values for Max Amplitude, Min Amplitude, and Cycles.
    Different blocks come together to make a block sequence, which is used for the damage calculation.
  7. Click Create.
    Figure 7.


Tip:
  • Use the and icons to import and export block load .csv files.
  • Select a block and click to delete it.
  • To exclude a block from the load, disable its checkbox.

Add Eigen Value/CMS Loads

There are two types of modal participation factor channels available: Eigen Value (via a .pch file) and CMS (via an .mrf file). Both are available for the Modal Superposition loading type.
  1. Click the Load Map tool.
    Figure 8.


    The Load Map dialog opens.
  2. Select Eigen Value (pch) or CMS (mrf) from the Channel Type drop-down menu in the top-left of the dialog.
  3. In the Choose file field, click and browse for a *.pch/*.mrf file containing modal participation factors.
  4. Click to add the load case.

Add Input PSD Loads

There are two types of Input PSD channels available: Phase & Magnitude and Real & Imaginary. Both are available for the Random (Input PSD with FRF) loading type.
  1. Click the Load Map tool.
    Figure 9.


    The Load Map dialog opens.
  2. Select Input PSD: Phase & Magnitude or Input PSD: Real & Imaginary from the Channel Type drop-down menu in the top-left of the dialog.
  3. In the Choose file field, click and browse for a *.csv file containing PSD vs frequency data.
  4. Click to add the load case.
    Figure 10.


    Note: Extrapolate specifies the handling method for y-values outside the specified range of the x-values of the input PSD curve. If Extrapolate = True , If an x-value input is outside the range of x-values specified on the table, the corresponding y-value look up is performed using linear extrapolation from the two start or two end points. If Extrapolate = False, If an x-value input is outside the range of x-values specified on the table, the corresponding y-value is equal to the start or end points, respectively.
  5. Optional: Click to view a plot of the loads.
    Figure 11.


Note: Any load channels that you import are specific to the channel type. If you switch the channel type, the channel window is cleared/updated.

Add Constant Loads

Constant loads are available for the Sine Sweep loading type.
  1. Click the Load Map tool.
    Figure 12.


    The Load Map dialog opens.
  2. Select Constant Load from the Channel Type drop-down menu in the top-left of the dialog.
  3. Click to add the load case.
  4. Edit the scale value.
    This value is used to apply a constant scale across all frequency response stresses.

Add Variable Scale Loads

Variable Scale loads are available for the Sine Sweep loading type.
  1. Click the Load Map tool.
    Figure 13.


    The Load Map dialog opens.
  2. Select Variable Scale from the Channel Type drop-down menu in the top-left of the dialog.
  3. In the Choose file field, click and browse for a .csv file containing Frequency vs Scale data.
    This data is used to apply variable scales across frequency response stresses.
  4. Click to add the load case.