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Chapter4. DataAnalysis 75 results for high frequencies are to be obtained. This of course has to be weighted against other factors such as costs, microphone diameter and possible installation positions, though the latter two were not of concern for the OPENAIR test. In ad- dition, the low-frequency mixing noise of the jet occurs at the bottom part of the SODIX plots, meaning that it is only picked up by the downstream part of the lin- ear array. It is therefore uncertain whether the most intense section of the mixing is inside the measured area. A downstream extension of the microphone array would allow to capture the whole jet mixing area and provide a clearer view on the sound field of the jet. The SODIX algorithm proved to be a stable source directivity analysis tool. The very low-frequency (up to 500 Hz) plots suffer from low resolution that could not be completely alleviated by increasing the source position grid density, but due to engine scaling effects (see Sect. 2.2.1), these frequencies are not of interest, as they at the low end of the audible range when scaled. The aliasing effect occur- ing for higher frequencies is a common problem of source localization methods. According to the findings of this thesis, it results from the discrete and regular microphone spacing, is in the data and cannot be compensated in the analysis. Internal experience showed, that the aliasing present when assessing the sound field with SODIX is comparably weaker to other source localization methods such as beamforming. However, the aliasing effect prevented the shortening of the source position grid to reduce the calculation time. A python routine for plotting and comparing the SODIX output was written in the scope of this thesis. The output of the comparison plot routine proved diffi- cult to interpret, however, when great differences in SPL were detected between different test cases. Though this issue was partly alleviated by limiting the max- imum dynamic range on the plot, this solution only acts as a workaround. One possible approach would be to weigh the local SPL in relation to the absolute maximum, giving large relative differences a reduced impact on the overall field and thus enhancing the difference of the main sources while lowering the sig- nificance of secondary events, though this would further complicate readability and interpretation of the sound field for readers unexperienced with SODIX. In addition, the object-oriented plot routine has been designed open-ended for us- age beyond this thesis. As such, implementation of a graphical user interface to facilitate accessibility would be a desirable enhancement of the tool.PDF Image | Investigation of wing installation effects on the sound field of a model jet engine
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