Abstract
Noise field analysis is usually the first design task of an ANC-system design process whose procedure has been discussed in Chap. 8. Such an analysis may also include noise source identification in order to develop an ANC concept that is capable of shielding the interior effectively against exterior noise. For this purpose it is essential to determine both positions and source strengths of the primary noise sources. These information are required for an appropriate placement and control of actuators and sensors. A powerful ANC-system design tool that can be used for noise source identification is the IFEM. This tool was described in Sect. 7.2. The upcoming chapter reports on investigations in which the IFEM has been applied to identify acoustic hot spots in a cross-section of a long-range airliner. The sound field in this cavity that represents the basic system was excited by internal as well as by external sources and mapped with a custom-built microphone array. A matching finite element model was developed. As it will be shown in the following chapter, the acoustic variables were calculated from the measured data with success.
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Notes
- 1.
If the cavity is approximated by a rectangular enclosure with sound hard walls, having a width of L=4.2 m, the frequency of the third acoustic mode can be approximated by f n3≈3⋅343 m s−1/(2⋅4.2 m)=122.5 Hz.
References
Sachau D, Drenckhan J, Kletschkowski T, Petersen S (2005b) Entwicklung von Messtechniken zur Lärmquellenidentifizierung in Kabinen. Final Report, Hamburg Aircraft Research Program (Lufo Hamburg 1), TUT-34, Helmut-Schmidt-University/University of the Federal Armed Forces Hamburg
Simanowski K, Kletschkowski T, Sachau D, Samtleben B (2009) Acoustic ground tests in a cross-section of a long-range airliner for validation of the inverse finite element method. In: Proc of NAG/DAGA 2009, int conf on acoustics, including the 35th German annual conference on acoustics (DAGA), Rotterdam, Mart 23–26
Weber M (2009) Inverse Schallquellenortung in Flugzeugkabinen. Dissertation, Helmut-Schmidt-University/University of the Federal Armed Forces Hamburg
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Kletschkowski, T. (2012). Noise Source Localization in an Aircraft Cabin. In: Adaptive Feed-Forward Control of Low Frequency Interior Noise. Intelligent Systems, Control and Automation: Science and Engineering, vol 56. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-2537-9_13
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DOI: https://doi.org/10.1007/978-94-007-2537-9_13
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