software maintenance

Library

The SoundPLAN Library hosts information that might be relevant to multiple projects. Therefore the library includes System, Global and Project libraries. The System libraries come with the program and are read only to safeguard overwriting the information. The Global Library stores acoustics and pollution data that is available to all SoundPLAN users in a net. Each project has a Project library containing the data used in that project. Data can be copied freely between the different libraries. The global library can reside anywhere you want in the net by defining the "GLOBAL PATH."

Libraries are available for

Emission	Sound power spectra for the industrial noise; Octave or Third Octave;
Absorption	Absorption coefficients for reflective material
Transmission	Transmission losses for noise transmitted through walls
Attenuation	Noise control options for the Expert System (silencers...)
2D-Directivity	Directivity of industrial sources as a plane 2D directivity or with rotational symmetry around vertical axis
3D-Directivity	3D directivity for industrial sources (enter the directivity in lines of longitude/latitude)
Day histogram	Defines fluctuations of the sound power over the 24 hours of the day for industrial sources
Road day histogram	Vehicle numbers over the 24 hours of the day for cars and trucks
Wind statistics	Wind definitions for air pollution calculations
NMPB Meteo statistics	Meteorological statistics for the French NMPB (European road module)
Pollutants	Pollutant parameters
Assessment	Conversion from the raw sound pressure to the assessed noise levels
Aircraft classes	Aircraft classes according to AZB and ECAC

Libraries are databases and are fully searchable. Under a given name multiple fields define acoustics or pollution parameters.

Following is the sound power definition for an airplane. The lowest frequency was selected to be 125 Hz, the highest was 10kHz. The data are entered QA weighted, but can be changed to linear or any other filter curve. In this case, the directivity is only in the horizontal plane and is not frequency dependant.

The examples below are taken from the road day histogram. The vehicle numbers for cars and heavy vehicles are entered in a spreadsheet type environment. Additional tabs allow the view to be selected to show charts of the entered data.

Under "VALUE," the data are entered for cars and trucks for each of the 24 hours.

Last modification: 14 January 2004