3. Modeling A#

3.1. Characteristics of modeling#

Items used for pipes: FLUI_STRU

Element used for mass in \(\mathrm{AM10}\): DIS_T

In all calculation cases, the exciting spectral density is level 1 white noise.

Volume flow and pressure flow sources are applied to node \(\mathrm{AM1}\).

The sources of mass and force are applied between nodes \(\mathrm{AM1}\) and \(\mathrm{AM2}\).

The last calculation case corresponds to a force imposed on node \(\mathrm{AM10}\) in the \(\mathrm{dx}\) direction.

The natural frequency modes in the interval \([\mathrm{0,}100\mathrm{Hz}]\) were taken into account in the calculation, i.e. the first two modes.

Damping is introduced in modal form in the random dynamic response operator. For all calculation cases, it is taken equal to \(\text{1\%}\)

Number of knots: 17

Number of meshes and types: 16 SEG2, 1 POI1

Fluid source spectral densities are expressed in their physical units. For a volume flow source in \({({m}^{3}/s)}^{2}/\mathrm{Hz}\).

Acceleration spectral density values at point \(\mathrm{PB25}\) :