FEARCE applications

Noise, vibration and harshness analysis

FEARCE includes an advanced noise, vibration and harshness (NVH) module for vibration and sound prediction. The FEARCE NVH module carries out vibration analysis on models by performing a forced response after a model analysis has been run. A sinusoidal forcing function is applied to the mode shapes as a Fourier loading on individual nodes in the frequency domain. This loading is then solved to calculate the resulting contribution of each mode. Finally, the model contributions are combined to give complex vibration levels for each forcing frequency. Output can be in either the time or frequency domain. Calculated values are nodal displacement, velocity and acceleration spectra.

As a part of the vibration tools, FEARCE can carry out radiated noise analysis. Methods include the Rayleigh integral as well as the boundary element method (BEM). Noise outputs include dBA weighted, narrow band or 1/3 Octaves, noise-intensity contours, audible-noise synthesis (*.wav), total sound power and Campbell diagrams. Vibration results can also be exported to SYSNOISE® for further post-processing.

Key features

  • Direct and indirect vibration solutions
  • Rayleigh and BEM solution methods
  • Automatic creation of BEM meshes

Relevant publications