SpectraSim Documentation
Parameter · 07 Run Settings

Modal participation

acoustics.modal.participation Step 07 · Run Settings

Modal participation: part of the acoustic modal analysis.

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Theory

Projects the swept pressure on the undamped modes at every frequency, so you can see which mode carries the response at a peak or a dip. It is computed inside the sweep at negligible cost. See Acoustic modal analysis: eigenfrequencies, damping, participation.

Equations

αn(f)=ϕnTMt p(f)\alpha_n(f) = \phi_n^T M_t\, p(f)
(1)
wheremeaningunit
αn\alpha_nParticipation of mode nPa kg^0.5
ϕn\phi_nMass-normalised mode-
p(f)p(f)Swept nodal pressurePa

Default and rule

Default
off
Rule

Off.

Valid range on | off

Range

on | off.