Underwater vehicle propeller damage detection method based on wavelet analysis

Abstract

The invention provides an underwater vehicle propeller damage detection method based on CFD and wavelet analysis. The method comprises the steps of taking three-dimensional computer aided design software SOLIDWORKS as platform software, and building a geometric model of a flow field around an underwater vehicle hull, a surrounding shell, a tail vane, a propeller hub, a propeller blade and a submarine, taking ANSYSICEMCFD as platform software, and carrying out geometry repair, computational domain division and grid generation, opening a CFX-Pre module of ANSYSCFX software, and carrying out numerical calculation pretreatment, starting CFD simulation, and acquiring the force of the propeller in the y direction, the force borne by the propeller in the z direction and the monitoring torque in the x direction with the head end point of the underwater vehicle as the monitoring point, taking MATLAB as platform software to call a wavelet toolbox, using the wavelet toolbox for carrying out six-layer wavelet decomposition by adopting db5 wavelets, comparing complete blade spiral diameter data and broken blade propeller data, and establishing a fault database for subsequent fault diagnosis. Thus, the interference of the environment on visual detection can be avoided.

Description

technical field [0001] The invention relates to the field of computational fluid dynamics, in particular to an underwater vehicle propeller damage detection method based on CFD and wavelet analysis. Background technique [0002] Underwater vehicles play an indispensable role in maritime strategy. The combat capability of underwater vehicles plays an extremely important role. The survivability of underwater vehicles is one of the important indicators to measure the combat capability of submarines. Underwater vehicles work in a complex and dangerous marine environment, and many emergencies may cause the propeller of the underwater vehicle to fail. The propeller is composed of the engine, the shaft, the blade and the blade. There are many reasons for its failure. Among them, the blade part is more likely to be damaged. The propeller blade receives the radial direction during the working process, and the resistance of the fluid to it As well as the force generated by the collis...

AI Technical Summary

Problems solved by technology

However, in the actual working environment, the signals that can be collected will inevitably be mixed with noise signals, such as underwater background noise, mechanical operation noise, etc. These noise signals will exist in the spectrum in the form of different frequency components, so only In the case of spectrum analysis, the obtained spectrum information will inevitably be disturbed by noise, which will affect the fault detection effect

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