Physical Modeling of the Hydroacoustic Field of a Marine Propeller

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The paper presents a research of the acoustic field of the propeller, including at the resonant frequencies of its blades. The research is based on a computational and experimental approach based on the combined use of numerical and experimental physical modeling. The paper shows the importance of taking into valuation the elastic resonances of the propeller in the design, demonstrates the methods of physical and numerical modeling used, which provide high accuracy in determining the resonance frequencies of the blades in water and in air. Using the example of two propeller models made of different materials, the effect of Q-factor on the levels and type of the radiation spectrum is experimentally demonstrated.

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Sobre autores

A. Stulenkov

Institute of Applied Physics of the Russian Academy of Sciences

Autor responsável pela correspondência
Email: stulenkov@ipfran.ru
Rússia, Nizhny Novgorod

V. Artelny

Institute of Applied Physics of the Russian Academy of Sciences

Email: stulenkov@ipfran.ru
Rússia, Nizhny Novgorod

P. Korotin

Institute of Applied Physics of the Russian Academy of Sciences

Email: stulenkov@ipfran.ru
Rússia, Nizhny Novgorod

A. Suvorov

Institute of Applied Physics of the Russian Academy of Sciences

Email: stulenkov@ipfran.ru
Rússia, Nizhny Novgorod

I. Gorbuntsov

Malakhit Marine Engineering Bureau

Email: stulenkov@ipfran.ru
Rússia, Saint Petersburg

M. Norkin

Institute of Applied Physics of the Russian Academy of Sciences

Email: stulenkov@ipfran.ru
Rússia, Nizhny Novgorod

S. Zaytseva

Institute of Applied Physics of the Russian Academy of Sciences

Email: stulenkov@ipfran.ru
Rússia, Nizhny Novgorod

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2. Fig. 1. The device with the investigated propeller at the landfill

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3. Fig. 2. Diagram of screw measurements in air in an anechoic chamber

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4. Рис. 3. Сравнение узкополосных и третьоктавных спектров расчетных и экспериментальных коэффициентов передачи в воздухе. Тонкие кривые — узкополосные коэффициенты, толстые кривые — коэффициенты в третьоктавных полосах. Цифрами обозначены номера синфазных мод лопастей. На картинке справа изображена экспериментальная форма колебаний № 3

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5. Fig. 4. Measurement scheme in water in stop mode

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6. Fig. 5. Comparison of propeller resonances excited in the calculation for a free screw (blue curve) and in the experiment (green curve is a free screw, red curve is a screw on the model) at the location of the hydrophone in water. The numbers indicate the common-mode modes for each waveform

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7. Fig. 6. Pressure spectra for different propeller rotation speeds, the black curve is the background noise level. Blue numbers indicate in-phase oscillation modes, red numbers indicate non-in-phase modes

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8. Fig. 7. Comparison of the resonances of the propeller excited in the calculation with the measurement results during shaft rotation with a frequency of 0.025 f0 Hz. The numbers indicate the common-mode modes for each waveform

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9. Fig. 8. Comparison of pressure levels recorded on the foot with a screw (blue curve) and without a screw (red curve) when the shaft rotates at a frequency of 0.025 f0 Hz with the pressure recorded on the move (green curve) at the same shaft revolutions as on the foot. The black curve is the background noise level. Arabic numerals indicate ranges containing modes of oscillation forms, Roman numerals indicate discrete components whose frequencies depend on revolutions

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10. Fig. 9. Comparison of transmission coefficients in air for duralumin and caprolon screws: blue curve — duralumin screw, experiment; red curve — caprolon screw, experiment; green curve — caprolon screw, calculation. The numbers indicate the common—mode numbers of the blades (blue color — duralumin screw, red color - nylon screw)

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11. Fig. 10. Comparison of the acoustic response in water of two freely suspended screws made of different materials under shock excitation

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12. Fig. 11. Comparison of the emission spectra of two screws when the device is moving with a shaft speed of 0.025 f0. Black numbers indicate ranges containing modes of oscillation forms, Roman numerals indicate harmonics that depend on revolutions

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