A precise approach to vehicle engine bay noise
But for maximum vehicle engine bay noise reduction, it is beneficial to know exactly where in the compartment the unwanted noise is coming from – something that has previously been difficult to pin down.
In an article published in the International Journal of Vehicle Noise and Vibration, a team from Xiamen University in China outline their method to locate engine noise and eliminate uncertainty about its precise position.
They use a corrected fast independent component analysis, or FastICA, to determine the individual sources of noise in the engine compartment.
FastICA is an algorithm that allows individual components to be analysed quickly, and was combined with spectrum maximum similarity to improve the certainty level of the results.
In their example, the team used the approach to accurately locate the sources of engine noise in an excavator in a variety of working conditions, but it could equally be applied to any vehicle, including passenger cars on the roads.
By accurately pinpointing the position of engine noise, the necessary acoustic insulation can then be added to achieve the desired level of vehicle engine bay noise reduction in a highly controlled way.