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Chapter2. Theory 25 In addition, the routine is able to compare two different TOB objects, given that the microphone and source positions are identical. This restriction is required, as the routine bases the abscissa and ordinate on those positions. The differential plot routine works for individual TOB, but SODIX output files can be input as well; their TOB objects will then be used if applicable. Figure 2.13 depicts an ex- ample comparison plot with explanations for future reference. The color scale of the comparison plots uses a heat scale, with white being identical SPL between compared objects. The dynamic range is based on the greater of absolute maxi- mum and minimum. The second TOB object is always subtracted from the first one, i.e. that if the plot shows mainly red colors, the first TOB radiates noise at a higher SPL. It has to be noted, that the comparison routine always displays the relative difference between two plot points, independent of their actual SPL. This entails that sometimes areas with a SPL that is comparably low to the main event get highlighted, because the relative difference is large at those points. This does not necessarily mean that those areas are relevant within the sound field. Figure 2.13: Plot of an example SODIX comparison of two TOB with explanatory mark- ings.PDF Image | Investigation of wing installation effects on the sound field of a model jet engine
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