Parameter

Values

Description

SPLRHO

Real > 0.0

Default = 1.0

This parameter is used to specify the density of the acoustic medium in the calculation of the complex acoustic sound pressure and the complex particle velocity vector, as shown below (refer to Radiated Sound Analysis in the User’s Guide for further information):

Sound Pressure Level

Total Complex Acoustic Sound Pressure requested by SPL is:

Where,

is the frequency of the sound wave in the medium.

is the density of the acoustic medium defined by PARAM, SPLRHO.

is the distance from the acoustic source grid j on the panel to the microphone location grid (see Figure 1).

is the velocity flux of the source grid j.

k is the wave number as defined in Wave Number.

i is the square root of -1

np is the number of source grids (see Figure 1).

q is the value of the scale factor specified using the parameter PARAM, SPLFAC.

Complex Particle Velocity Vector

The complex particle velocity vector is defined for each frequency as follows:

Where,

is the complex acoustic pressure due to source grid j at the microphone location.

is the unit vector from the source grid j to the microphone grid

(see Figure 1)

is the density of the acoustic medium defined by PARAM, SPLRHO.

c is the speed of sound defined by PARAM, SPLC.

k is the wave number defined above under Wave Number.

is the distance from the acoustic source grid j on the panel to the microphone grid (see Figure 1).

i is the square root of -1

Note: