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Chapter2. Theory 24 Output There are only two output parameters of the SODIX algorithm: The frequency range selected in the sdx-file in narrow band steps and the modelled CSM for the selected microphones for each narrow band. Both are saved to a mat-file and need to be processed before further information can be extracted. An object-oriented python plot routine for SODIX output was developed in the scope of this work, based on a MATLAB plot routine previously implemented by DLR. The python routine is able to plot the SPL for selected SODIX result files. Each file contains an object that corresponds to all TOBs, which the data encompasses. Plots are carried out on the TOB level, i.e. each TOB is plotted individually and cannot be split into smaller spans. It is possible to plot a range of narrow bands if they are within a TOB and the input data does not contain more information. Fig- ure 2.12 shows an example SODIX plot. The abscissa is length scaled with nozzle diameter and marks the position of the individual source points, the ordinate is the emission angle of each of those source points. This means, that the directiv- ity of a source point can be read from a vertical line. The SPL of the directions is given by the color scale on the right side of the plot, which, unless specified otherwise, has a dynamic range of 20 dB. The nozzle exit plane is marked by a vertical dashed line, whereas the wing trailing edge and the flap tip are marked by dotted lines respectively. Figure 2.12: Plot of an example SODIX calculation with explanatory markings.PDF Image | Investigation of wing installation effects on the sound field of a model jet engine
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