19th INTERNATIONAL CONGRESS ON ACOUSTICS

SILENCE is a European project, started in 2005, which adresses the problem of reduction and control of surface transport noise in urban areas. Within this framework, a Global Modelling Tool is developed. The aim is to predict and simulate the noise emitted by a vehicle (train, tram, car) under real operating conditions. This tool will be used for parametrical and psychoacoustic studies to test noise reduction solutions. A software, called VAMPPASS, is currently implemented. A vehicle is represented as a set of equivalent point sources. Each source is defined by its position, and its characteristics in terms of emission level, radiation pattern and evolution with speed. Scenarios of pass-by vehicles are chosen by the user, allowing the vehicle to accelerate or decelerate at specified events in time and speed. The output of the software are: the sound pressure as a function of time, a third octave band analysis and the time evolution of the pressure level. A B-format sound file allows to listen to the signal in various configurations. In this paper, we will present the input and output data of the software. We will decribe in detail the synthesis method and the choice of its parameters