This example analyzes results of an engine run-up in neutral gear inside a semi-anechoic chamber. The goal is to identify tonal components that appear repetitively in the complete time sequence. These components, identified at 925Hz and 1250Hz, can be seen in figure 7 (spectrum of selected time). Figure 8 clearly identifies noise sources on the crankshaft pulley (left) and another noise source on the engine core (right).
Figure 7: Frequency spectrum of engine run-up.
Figure 8: Accurate localization of sound sources for 925Hz (left) and 1250Hz (right).
More information on:
- Sound Source Localization technologies
- Acoustic beamforming technique and near-field focalization
- Acoutics holography technique
- Spherical beamforming technique for interior sound source localization
