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PARAM, SPLREFDB

PARAM, SPLREFDB

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PARAM, SPLREFDB

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Parameter

Values

Description

SPLREFDB

Real > 0.0

Default = 1.0

This parameter can be used to specify the reference sound pressure value used to calculate the Sound Pressure Level (SPL) in decibels (dB).

The Sound Pressure Level (SPL) in decibels can be calculated using the following equation:

Where,

is the Sound Pressure Level in decibels.

is the magnitude of the acoustic sound pressure specified in Radiated Sound Analysis of the User’s Guide.

SPLREFDB is the reference sound pressure value specified using this parameter.

Note:

The reference pressure is dependent on the units specified on the UNITS I/O Options entry. If the units are SI, the value is set as 2.0E-5 Pa. If they are CGS, it is set as 2.0E-4 barye. If they are MPa, it is set as 2.0E-11 MPa. If they are BG or EE, then it is set as 4.17E-7 lbf/ft2. If no UNITS data is present, the default value is 1.0 (exception: see comment 3 on the PEAKOUT Bulk Data Entry).