FLIGHT TEST WEEK 'OPEN CONFERENCE' - hosted by Society of Flight Test Engineers (SFTE)
Running in Auditorium 3 on the Exhibits floor) on 18, 19, 20 Nov 2008
|
|
FLIGHT TEST WEEK 'OPEN CONFERENCE' - hosted by Society of Flight Test Engineers (SFTE) Running in Auditorium 3 on the Exhibits floor) on 18, 19, 20 Nov 2008 |
|
Interior Beamforming Measurements Using 3D-Microphone Arrays
Wednesday 19th November 2008
15.30 - 16.00
Auditorium 3
Conventional space, time and frequency selective analysis in cavities is nearly impossible and it is difficult to find multiple sound sources position in space. Traditional beam forming systems with planar microphone arrays do not give comprehensive information about the sound sources inside a cavity such as an airplane interior. The Acoustic Camera from GFaI was adapted to a spherical, acoustically transparent and Omni directional array and a new option allows mapping onto a common 3D-CAD-models of the object of interest, for instance an airplane cockpit. The advantages and disadvantages of 2D- and 3D-mappings are presented as well as positioning an array in the coordinate system of the 3D-model and in the actual cavity to be measured, the geometric and acoustic properties of microphone arrays which are applicable for complete 3D-measurements and mappings of cavities, and a practicable way of determining the array's position and direction related to the measurement object.