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Chapter3. Implementation 39 Figure 3.11: Clustering of sound sources due to a shortened source position grid (type Lα,2) for TOB 10000 Hz, DLR 317. The highest SPL is approximately 90 dB and barely visible at the far right side of the directivity matrix. Because shortening the source grid length is not feasible, several tests have been carried out using a different source point spacing, violating the maximum source offset criterion ∆xs < 0.25λ . . . 0.4λ (see Sect. 2.3.4). As expected, the subsequent plots differ significantly from the ones done with the reference grid, which is why this approach was deemed unfeasible as well. Further analysis revealed that there was an insufficient amount of source positions at low frequencies, unnecessarily diluting result plots, as SODIX cannot allocate the true sources unambigously (see Fig. 2.11). Tests revealed a beneficial influence when the source point density is increased at these frequencies. The original intent of optimising the source positions in order to reduce computa- tion time could not be achieved. At high frequencies, the aliasing effect prevents shortened grids. In fact, the final grid used in this work (Fig. 3.12) has more source points than the original reference grid. It is therefore optimised for this specific task and should not be generalized when dealing with other source di- rectivity analyses. It uses a constant length l = 5 m and a source position spacing of ∆xs = 0.25λTOB, except below 500 Hz, where the source point distance remains constant. Iteration steps It is stated in the various publications concerning SODIX (see Sect. 2.3.4), that the algorithm is preferably to be run with 200 iteration steps. This number was therefore chosen for this work as well. However, time constraints created thePDF Image | Investigation of wing installation effects on the sound field of a model jet engine
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