PARAM, SPLREFDB

Bulk Data Entry Specifies the reference sound pressure value used to calculate the Sound Pressure Level (SPL) in decibels (dB).

Parameter	Values	Description
`SPLREFDB`	Real > 0.0 Default = 1.0	The Sound Pressure Level (SPL) in decibels can be calculated using: $SP L_{dB} = 20.0 * {log}_{10} (\frac{\| SPL \|}{SPLREFDB})$ Where, SPL_dB Sound Pressure Level in decibels. $\| SPL \|$ Magnitude of the acoustic sound pressure specified in Radiated Sound Output Analysis of the User Guide. SPLREFDB Reference sound pressure value specified using this parameter.

Comments

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).