Software Maps Sound Created by Mobile Targets

Bruel and Kjaer has added the Moving Source software option to its Pulse data analyser system, to make it easier to perform noise-source identification on moving vehicles. Unlike traditional beamforming kits, the Moving Source software follows a mobile target, instead of focusing on a single point. It tracks linear movement parallel to a planar microphone array and enables speed-position calculation from a radar signal, GPS or photocells. Beamforming is a method of mapping noise sources using an acoustical array.

It discerns the direction from which a sound originates, by means of the time delays that occur as the sound passes over an array of microphones. This method is very quick, allowing a full map to be calculated from a single-shot measurement, making it suitable for noise-source location of sound radiated from moving vehicles such as cars, lorries and trains. Moving Source beamforming can also be used as a troubleshooting contribution during pass-by measurements and mapping planes from the side of a vehicle.

Bruel and Kjaer's Pulse hardware provides a stable and continually updating data-analysis system, which allows users to add upgrades, rather than switching to an entirely new system, as software is developed. On a global scale, there are currently more than 9,500 Pulse systems being used for research development and production test purposes, within automotive, aerospace, education and telecommunication industries. An overview of the complete range of measurement solutions encompassed by the Pulse system platform is given in the latest Pulse Analyser and Solutions catalogue.

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