Noise Source Localization in an Aircraft Cabin
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.
KeywordsNoise Source Sound Field Microphone Array Inverse Calculation Longitudinal Acoustic Mode
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