The global pump manufacturer Grundfos has enhanced its noise source identification capabilities, with a system based on a microphone array containing 108 microphones and optical camera in the middle. Based in Denmark, Grundfos’ state-of-the-art laboratory carries out sound measurements to ensure its pump units are quiet enough for domestic use and industrial demands - and to locate any potential causes of reliability issues.
To improve its ability to locate very small noise sources during product development, the company approached Brüel & Kjær for a solution.
Grundfos set up a challenging test by using one of its well-functioning pumps and rigging it with two tiny, movable sound-sources.
During the test, Brüel & Kjær demonstrated how its complete noise source location system could identify the sources’ various frequencies and levels, producing a sound map that clearly visualised the sources, all in a short space of time.
The system will enable Grundfos to identify noise sources at a wide range of distances.
At medium-distances, the array uses beamforming technology, while - to pinpoint sources close up - it uses near-field holography methods.
Many conventional arrays cannot perform accurate measurements at both near and medium distances, but the unique geometry of this array makes it highly versatile.