The University of Central Florida Community Noise Model

The Community Noise Model (CNM) is a true simulation model written in Visual Basic allowing modeling of motor vehicles. User input is simplified by permitting spreadsheet input or graphical input using a mouse. Due to its simulation nature, the model handles interrupted flow traffic much better than conventional line source models. The model begins by using reference energy mean emission levels (REMELS) from a quite extensive measurement program. Propagation characteristics (geometric spreading, ground effects, atmospheric absorption, diffraction, etc.) are calculated at user-specified time step and energy is summed at user-defined locations. Using the acoustic energy summations, the model reports Leq, Lmax, and statistical levels. Traffic parameters are also reported. Validation has been performed as well as comparison to other established models and will be presented. The CNM performed quite well and at intersections outperformed other models when comparisons were done to measured data.