The modal frequency response, such as the sound pressure or displacement, can be expressed as

The first plug-in uses a script to recover the fluid-structure coupled MCF ( for each mode at a response point for a range of frequencies) based on the mode shapes, , (from the frequency step) and the modal amplitudes, , (from the steady-state dynamic step with modal output requested) in the output database. The plug-in sums these partial pressures and compares them against the ABAQUS total. In addition, the script creates a ranking criterion based on a sensitivity analysis.

The second plug-in uses a script that displays polar or vector plots or bar graphs that allow you to identify the most significant modes at each excitation frequency.