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Chapter3. Implementation 41 resulting sound directivity. As the objective of this thesis is the evaluation of the main sound event, results with 100 iteration steps are acceptable, as their analyses entail an almost unchanged sound field and can thus be conducted without com- promising the result. The deviation is larger for 50 iteration steps, which should therefore be used more carefully. All TPs analysed with SODIX in the scope of this thesis have their number of iteration steps listed in Table A.3. Slack variables Preparing the analysis, several SODIX runs have been conducted for one TOB of a single TP, altering the slack variable σ1 between each run in order to deter- mine an optimal value for σ1 for all future runs. Four values have been selected: σ1 = {0, 0.001, 0.01, 0.1}, where σ1 = 0 represents a disabled smoothing function G1(d). The results are displayed in Fig. 3.14. As expected, the source directivity becomes smoother for increasing values of σ1 (see Sect. 2.3.4). However, due to the interpolation between neighbouring sources, the detected maximum SPL de- creases. Peculiarly, the SPL maximum does not decrease strictly monotonic for in- creasing σ1, but is nearly equal to no smoothing for σ1 = 0.01. If the slack variable becomes too large (σ1 > 0.01), the dynamic range of the output is reduced consid- erably. σ1 = 0.001 represents a good compromise of source directivity smoothing without reducing the readability of the output data, while simultaneously filter- ing out frequency response deviations. However, generalizing conclusions for all TOB and experiment setups cannot be drawn. Therefore, the σ1-smoothing func- tion will be turned off (σ1 ≡ 0); should need arise, calculations of specific TOB will be rerun with σ1 = 0.001.PDF Image | Investigation of wing installation effects on the sound field of a model jet engine
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