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Chapter3. Implementation 36 Figure 3.9: Linear auto spectrum, showing frequency response variation on the one hand and an effect similar to a comb filter, marked by the black box, on the other. 6300 Hz TOB. Whereas in Fig. 3.10(a) the source directivity is relatively smooth, the jagged edges and fluctuating distribution in Fig. 3.10(b) are the result of the poor raw data quality. This effect, though cleary visible, does not impair the plots to an extend that they are no longer reliable, because the underlying physical phenomenon of source directivity towards the microphones is unadulterated. (a) TOB 1000 Hz (b) TOB 6300 Hz Figure 3.10: Comb filter effect evident in the source directivities of DLR 317 for TOB 6300 Hz. TOB 1000 Hz is free from this effect. The fluctuating distribution can be smoothed by increasing the value of σ1 in the SODIX configuration file. However, this procedure might not always be feasible, since the frequency response deviation phenomenon occurs only for higher fre- quencies. The penalty function may then yield inappropriate results, because the wavelength is shorter than the distance between two adjacent microphones (as explained in Chap. 2.3.4). It was furthermore tested, whether a variation of the source grid density would smooth out the raw data ambiguity (see Chap. 3.2.2).PDF Image | Investigation of wing installation effects on the sound field of a model jet engine
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