On the possibility of three-dimensional localization of the airframe noise sources using sequential non-synchronous microphone array measurements

Мұқаба

Дәйексөз келтіру

Толық мәтін

Ашық рұқсат Ашық рұқсат
Рұқсат жабық Рұқсат берілді
Рұқсат жабық Рұқсат ақылы немесе тек жазылушылар үшін

Аннотация

The paper presents the result of using a previously developed method for three-dimensional localization of acoustic sources based on data from non-synchronous measurements with a multi-microphone array from various positions, adapted for dipole-type sources characteristic of airframe noise. The work consists of two parts. In the first, the developed method was verified using the example of localization of test dipole sources. Sources with different orientations of the dipole moment relative to the edges of the microphone array are considered. Based on the results of localization of test sources, it is shown that a dihedral array, the faces of which are parallel to the dipole moment of the source, allows for more accurate identification of a dipole source in three-dimensional space compared to the general case. In the second part of the work, the method is used to construct three-dimensional noise sources localization maps of a small-scale high-lift wing model with an imitation of extended landing gear, which has a complex structure of dipole sources of various amplitudes and directions. An analysis of the obtained volumetric localization maps in various frequency bands was carried out by comparing such localization with test cases and the possibility of localizing sources under study was shown.

Толық мәтін

Рұқсат жабық

Авторлар туралы

O. Bychkov

Central Aerohydrodynamic Institute

Хат алмасуға жауапты Автор.
Email: oleg.bychkov@tsagi.ru

Moscow Research Branch

Ресей, Moscow

M. Demyanov

Central Aerohydrodynamic Institute

Email: oleg.bychkov@tsagi.ru

Moscow Research Branch

Ресей, Moscow

Әдебиет тізімі

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2. Fig. 1. Configurations of a polyhedral microphone array: (a) — a two-sided microphone array; (b) — a three-sided microphone array.

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3. Fig. 2. Localization of the z-dipole test source, dynamic range 2 dB: (a) — monopole function of sources; (b) — z-dipole function of sources. Upper figures — synchronous data processing, lower figures — asynchronous data processing. Dihedral microphone array. The black dot indicates the location of the test source.

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4. Fig. 3. Localization of the x-dipole test source, dynamic range 2 dB: (a) — monopole function of sources; (b) — x-dipole function of sources. Upper figures — synchronous data processing, lower figures — asynchronous data processing. Dihedral microphone array. The black dot indicates the location of the test source.

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5. Fig. 4. Localization of (a) z-dipole and (b) x-dipole test sources, dynamic range 2 dB with the corresponding dipole function of the sources. Triangular microphone array, asynchronous measurements. The black dot indicates the location of the test source.

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6. Fig. 5. Experimental study of noise flowing around a wing console element in the AK-2 TsAGI: (a) — microphone array on the side, position 1; (b) — microphone array on top, position 2; (c, d) — experimental diagram with approximate positions of known dipole noise sources, top and front views. Configuration 1 (Table 1).

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7. Fig. 6. Spectral sound pressure levels averaged over microphones (a) — gratings on the side (position 1); (b) — gratings on top (position 2); (c) — gratings in both positions. The results for configuration 1 are shown in black, configuration 2 — in red, and configuration 3 — in blue. Bandwidth 200 Hz

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8. Fig. 7. Results of dipole source localization for configuration 3: (a) — localization of the y-dipole at a frequency of floc = 1 kHz; (b) — y-dipole, floc = 3 kHz; (c) — x-dipole, floc = 5 kHz. Dynamic range is 2 dB. The figures also show the maximum SPLmax levels of the localized sources (source amplitude at a distance of 1 m on the dB scale).

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9. Fig. 8. Results of dipole source localization for configuration case 2: (a) — localization of x-dipole at frequency floc = 2 kHz; (b) — x-dipole, floc = 3 kHz; (c) — x-dipole, floc = 5 kHz. Dynamic range 2 dB.

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10. Fig. 9. Results of dipole source localization for configuration 1: (a) — localization of y-dipole at frequency floc = 1 kHz; (b) — y-dipole, floc = 3 kHz; (c) — x-dipole, floc = 3 kHz; (d) — x-dipole, floc = 5 kHz. Dynamic range 2 dB

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11. Fig. P1. Results of localization of monopole sources for the case of configuration 3 at different frequencies: (a) — floc = 1 kHz; (b) — floc = 3 kHz; (c) — floc = 5 kHz. Dynamic range 2 dB

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12. Fig. P2. Results of localization of monopole sources for the case of configuration 2 at different frequencies: (a) — floc = 2 kHz; (b) — floc = 3 kHz; (c) — floc = 5 kHz. Dynamic range 2 dB

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13. Fig. P3. Results of localization of monopole sources for the case of configuration 1 at different frequencies: (a) — floc = 1 kHz; (b) — floc = 3 kHz; (c) — floc = 5 kHz. Dynamic range 2 dB

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