Frequency Response Assurance Criterion (FRAC)

Frequency Response Assurance Criterion (FRAC) is a measure of the correlation between two frequency response functions (FRFs) representing the same input-output relationship.

Supported vibration shapes include:

The frequency response results are assumed to come in one of the following result files:
  • H3D – binary result file typically generated using OptiStruct.
  • OP2 – binary result file typically generated using OptiStruct or Nastran.
  • PCH - ASCII result file typically generated using OptiStruct or Nastran.
  • UNV – ASCII result file typically exported from testing software.