An Acoustic analysis is solving for unknown pressure at each node. Every load can be translated into an incident pressure. In Harmonic Acoustic analysis the following different types of loads can be applied on the system:n? Mass Sourcen? Surface Velocityn? Diffuse Sound Fieldn? Incident Wave Sourcen? Port In DuctnIf you have a force applied to a face, you can divide the force by the area of the face and that is a pressure.nHarmonic Acoustics is a frequency analysis, so the input is the amplitude of a sinusiodal variation of pressure over time at a range of frequencies that are input into the Analysis Settings.n