Method for receiving sound pressure signals of e.g. excavator, involves filling inner chamber of closed testing environment with medium, where sound with velocity is propagated in medium as in air

摘要

The method involves directing microphones (2) of a microphone array (1) on an object (4). Sound pressure signals are evaluated to derive sound source positions and sound source strengths. The object is arranged within a closed testing environment for receiving the sound pressure signals, and an inner chamber of the closed testing environment is filled with a medium. The sound with velocity is propagated in the medium as in air, and the sound source positions and sound source starch are displayed on a display unit (6). The medium is selected from gas such as xenon, chlorine or bromine, and solid material such as gum and soft PVC.