Composite material propeller layering angle optimization method based on neural network

Abstract

The invention relates to a composite material propeller layering angle optimization method based on a neural network, and belongs to the technical field of turbomachinery simulation. The method comprises the following steps: establishing a composite propeller finite element model, and performing bidirectional fluid-solid coupling calculation on the composite propeller finite element model and a composite propeller computational fluid mechanics model to obtain a corresponding open-water characteristic curve; adopting an orthogonal test design method to preprocess the layering angle combinationand the corresponding hydrodynamic performance data; constructing a BP neural network with high nonlinear fitting based on numerical calculation software, training the constructed neural network by adopting a gradient descent algorithm, and finally obtaining the BP neural network with a mapping rule between the composite material propeller layering angle and the propulsion efficiency; and according to the trained BP neural network, carrying out optimization prediction on the combination situation of all the layering angles, and analyzing the obtained efficiency data to obtain the maximum network prediction value and the corresponding layering angle combination, that is, optimization of the lay-up angles of the composite propeller is realized based on the neural network.

Description

technical field [0001] The invention relates to a method for optimizing the ply angle of a composite material propeller based on a neural network, in particular to a method for optimizing a ply angle that can maximize the propulsion efficiency of a composite material propeller of a ship, and belongs to the technical field of impeller machinery simulation. Background technique [0002] Traditional metal propellers have high manufacturing and processing costs, poor damping performance, are prone to noise, and the blades are prone to corrosion, which directly affects the service life of the propeller and the survival and attack capabilities of military ships. Composite materials have high specific strength, high specific modulus, corrosion resistance, fatigue resistance, good damping and vibration reduction, good damage safety and designable performance, etc., and have been widely used in the fields of aerospace and civil engineering. With the development of my country's naval ...

AI Technical Summary

Problems solved by technology

However, the existing ply angle optimization method is too computationally intensive, relies too much on finite element software and is not universal, and does not carefully consider the changes in side tilt, pitch and pitch of the blade after fluid-solid interaction

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