Estimation Method of Cavitation Noise Characteristics Based on Propeller Wake Pressure Fluctuation Calculation

A pressure pulsation and noise feature technology, applied in the field of cavitation noise feature estimation based on propeller wake pressure pulsation calculation

Active Publication Date: 2017-03-08
安徽省爱夫卡电子科技有限公司
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Problems solved by technology

Since propeller cavitation is very different from spherical single cavitation, the accuracy of this conversion method needs to be further tested

Method used

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  • Estimation Method of Cavitation Noise Characteristics Based on Propeller Wake Pressure Fluctuation Calculation
  • Estimation Method of Cavitation Noise Characteristics Based on Propeller Wake Pressure Fluctuation Calculation
  • Estimation Method of Cavitation Noise Characteristics Based on Propeller Wake Pressure Fluctuation Calculation

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Embodiment

[0079] As shown in Figure 4(a), the cavitation noise feature estimation method based on the calculation of the propeller wake pressure pulsation specifically includes the following steps:

[0080] (1) The backup grid is generated and the calculation program is imported to generate the calculation example file:

[0081] Use professional modeling software to make the three-dimensional geometric model of the propeller and import it into the mesh generation software, as shown in Figure 1 (a) and Figure 1 (b), which are the E778A and E779B propeller models. Three alternative networks are established in the meshing software The calculation domains of these three alternative grids are the same. The velocity inflow boundary is 1D from the propeller center, D is the diameter of the propeller, the downstream pressure outlet boundary is 5D, and the distance from the center of the propeller to the side periphery is 2.5D. The number of grid cells is The multiples gradually increase, and the gr...

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Abstract

The invention discloses a cavitation noise feature estimation method based on propeller wake flow pressure fluctuation computing and belongs to the field of water sound target feature value extracting. The cavitation noise feature estimation method based on propeller wake flow pressure fluctuation computing comprises the following steps that (1) a standby mesh is generated and is guided into a calculation procedure, and then an example file is generated; (2) a cavitation model and a turbulence model are set; (3) numerical computation parameter setting is carried out; (4) numerical computation is carried out; (5) numerical method reliability demonstration and mesh determining are carried out; (6) cavitation wake flow pressure fluctuation non-constant numerical computation is carried out; (7) pressure fluctuation signal power spectrum conversion and low-frequency line spectrum amplitude value extraction are carried out; and (8) line spectrum feature estimation and analysis are carried out. Related researching results in the fields of modern hydromechanics, vacuole dynamics and signal processing are introduced into underwater target noise feature analysis, and the multidisciplinary and multi-field intersectionality is reflected.

Description

Technical field [0001] The invention relates to the field of feature extraction of underwater acoustic targets, in particular to a method for estimating cavitation noise features based on calculation of pressure pulsation of propeller wake flow. Background technique [0002] Propeller noise is one of the three major noise sources of ships. It contains the target propeller type information and structural features. These features are strong tolerant and have good separability. They are the main feature and important basis for identifying underwater targets. Once cavitation occurs, cavitation noise becomes the main noise of the propeller. These target source noises are distorted due to the interference of marine environmental noise and the propagation in the complex underwater acoustic channel, which makes the noise signal characteristics received by the passive sonar insignificant and reduces the signal-to-noise ratio. Therefore, it is more and more difficult to perform underwater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
Inventor 朱志峰
Owner 安徽省爱夫卡电子科技有限公司
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