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Geometric feature analysis method for hydrodynamic noise line spectrum of cylinder-like shell

A technique for cylindrical shells, geometric features, applied in the field of signal processing

Pending Publication Date: 2021-09-14
SOUTHEAST UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] Purpose of the invention: Aiming at the problems and deficiencies in the above-mentioned existing methods, the present invention provides a method for analyzing the geometric characteristics of the hydrodynamic noise line spectrum of a cylindrical shell. Adaptability, strong engineering practicability

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  • Geometric feature analysis method for hydrodynamic noise line spectrum of cylinder-like shell
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  • Geometric feature analysis method for hydrodynamic noise line spectrum of cylinder-like shell

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Embodiment Construction

[0030] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0031] Such as figure 1 As shown, a geometric feature analysis method of a cylindrical shell hydrodynamic noise line spectrum of the present invention comprises the following steps:

[0032] (1) The size parameters of the quasi-cylindrical shell are respectively set as follows: the thickness of the quasi-cylindrical shell h=0.027m, the radius r=0.533m, the length L of the front end circular frustum part=0.2132m, and the length L=4.867883m of the quasi-cylindrical shell. The experimental propeller T1 is used as a propeller with a diameter of 0.2482m and a four-blade large skew propeller. Use Gambit software to divide the CFD calculation grid and the grid of the finite element surface of the shell;

[0033] (2) In Fluent, the steady-state flow field calculation is performed first, and then the unsteady-state flow field calculation is performed. The iteration ...

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Abstract

The invention discloses a geometric feature analysis method for a hydrodynamic noise line spectrum of a cylinder-like shell. The method comprises the following steps: dividing a CFD grid and a grid on the surface of a finite element of the shell by utilizing Gambit software; obtaining a wall surface pressure pulsation data. Cgns format file; importing the grids on the surface of the finite element of the shell divided by the Gambit into an ICEM for grid data format conversion; importing the. Bdf file in the grid format into Nastran to carry out shell material attribute calculation, and calculating a free mode to obtain a. Op2 format file; setting a numerical model of the hydrodynamic radiation noise; setting a boundary layer type; and establishing a data recovery surface, arranging a sensor on the data recovery surface, and solving a sound pressure frequency response diagram at the position of the sensor. According to the characteristic analysis method, a numerical method is used for solving, and the relevance between the length size and the line spectrum frequency of the quasi-cylindrical shell can be obtained.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a geometric feature analysis method of a hydrodynamic noise line spectrum of a cylindrical shell. Background technique [0002] When the cylindrical shell passes through the water medium, a turbulent boundary layer is formed on its surface, the unstable flow is blocked by the shell surface, the momentum fluctuation near the wall is balanced by the pressure fluctuation on the interface, and the boundary layer pressure fluctuation is excited as a random excitation source to form Hydrodynamic noise. The hydrodynamic noise is caused by the disturbance in the surrounding turbulent boundary layer when the cylindrical shell passes through the water medium, the pulsating pressure on the wall surface, and the structural vibration caused by the coupling effect of the fluid and the solid. Generally speaking, the value of hydrodynamic noise is much lower than that of m...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/28G06F30/23G06F30/10G06F119/10G06F119/14
CPCG06F30/28G06F30/23G06F30/10G06F2119/10G06F2119/14
Inventor 曹红丽王晓燕姚帅方世良
Owner SOUTHEAST UNIV