Engine noise
Aircraft noise certification standards set noise limits around airports at Take-Off, Cutback and Approach. Aircraft engines provide the dominant source at both Take-Off and Cutback, and along with the airframe, a major contribution at Approach.
The Rotating and Acoustic Test Suites from Brüel & Kjær provide state-of-the-art tools to test and measure changes in noise caused by introducing new materials, such as carbon fibre blades or new noise-reducing acoustic panels, for benchmarking or approval.
The noise and vibration data acquired from engine test cell and ground test measurements are used extensively to predict noise while engine ground test measurements are used for family plan certification of aircraft derivatives and for evaluation of new noise-reducing devices. In addition, the use of arrays for noise source identification enables test engineers to fully identify noise sources and hence efficiently optimise noise reducing devices. Selective intensity can more specifically identify the sources and radiation mechanisms involved in the engines sound profile.
Solutions for:
- Airvehicle noise certification
- Engine noise certification
- Exterior noise analysis using beamforming, exterior noise source identification and noise intensity mapping to identify problem areas
- In-situ Acoustic Impedance Quality Control of engine duct acoustic panels
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