Description: Element total energies, densities, section point energies, and energy totals can be written to the output database (.odb) file, the results (.fil) file, or the data (.dat) file. The energy quantities are defined as period totals in steady-state dynamic analysis, except for strain and kinetic energy, which have zero totals per period. Therefore, strain and kinetic energy are reported as root-mean-square averages over a period.

The vibration intensity variable INTEN is a vector quantity available as element output from the output database. For general steady-state vibration it is complex-valued; for real-only steady-state vibration it is purely imaginary. In this case, however, the imaginary value is stored in the output database as real.

In complicated analysis of vibrating structural-acoustic systems such as passenger vehicles, determination of the modes that contribute the most to the acoustic response at a given point is of critical interest. In ABAQUS this can be achieved by performing a coupled eigenfrequency extraction analysis of the structural-acoustic system, followed by a steady-state dynamic analysis using the coupled modal basis; for example, subspace-based steady-state dynamic analysis. A new visualization script automates many commonly used sorting and graphical procedures based on modal contribution factor methodologies. Using the visualization script, the results from ABAQUS analyses can be manipulated to depict the relative contributions of specific modes to the sound levels at any given point. Problematic modes for noise exhibit modal contribution factors and high-phase coherence with the sound pressure.