Exterior acoustic array measurements on the bombardier global express

Authors

  • Antoine Malkoun Acoustics and Vibration Department, Bombardier, Aerospace Division, Dorval, Que. H4S 1Y9, Canada
  • Robby Lapointe Acoustics and Vibration Department, Bombardier, Aerospace Division, Dorval, Que. H4S 1Y9, Canada

Keywords:

Beamforming, Computer software, Microphones, Acoustic cameras, Bombardier global express, Time synchronization

Abstract

A methodology and in-house software were developed that uses a large number of microphones to focus on sound coming from a specific direction and measure the bombardier global express. A temporal delay-and-sum beamforming technique was developed at Bombardier to process the phased array data. The method consists in using a large number of microphones to focus on sound coming from a specific direction. The sensor outputs are delayed by appropriate amounts and added together reinforce the signal emanating from a specific region in space. It can be described as an acoustic camera, where the focus can be electronically shifted in space by manipulating the phases of the signals, similarly to how a parabolic antenna is mechanically aimed. A time-synchronization was done between the flight data recorded onboard and the acoustic data recorded on the ground via an event-tone transmitted over VHF.

Published

2007-09-01

How to Cite

1.
Malkoun A, Lapointe R. Exterior acoustic array measurements on the bombardier global express. Canadian Acoustics [Internet]. 2007Sep.1 [cited 2021May11];35(3):30-1. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1888

Issue

Section

Proceedings of the Acoustics Week in Canada