Prestress wet mode prediction method for composite propeller based on acoustic-structure coupling

Abstract

The invention relates to a prestress wet mode prediction method for a composite propeller based on acoustic-solid coupling, and belongs to the technical field of turbomachinery simulation. The methodcompriss the steps: based on a finite element principle, implementing fluid-solid coupling wet mode prediction of the composite propeller through an acoustic-structure coupling method; establishing acomposite material propeller model, and establishing a corresponding flow field area; carrying out mesh generation and prestress introduction on the composite material propeller model and the flow field area, and then carrying out analysis parameter setting; and finally outputting a modal analysis result to obtain a prestress wet modal frequency and a prestress vibration mode. According to the method, the actual vibration response generated by the composite propeller under the action of various vibration sources can be predicted, the influence of the additional mass of the fluid is fully considered, the high-precision prediction of the composite propeller prestress wet mode can be realized, and the prediction trueness and credibility are improved.

Description

technical field [0001] The invention relates to a method for predicting a prestressed wet mode of a composite material propeller based on acoustic-solid coupling, and belongs to the technical field of impeller machinery simulation. Background technique [0002] In recent years, glass fiber reinforced polymer-based composite materials have been gradually used in the research, design and manufacture of propellers. Compared with traditional metal propellers, composite propellers have high specific strength, high specific modulus, light weight, fatigue resistance, and damping and vibration reduction. It has the advantages of good performance, and can control the deformation of the structure by changing the direction of the fiber layup. At the same time, when using composite materials to replace traditional metals, its structural vibration characteristics must be considered. When the propeller operates in the flow field, it is affected by the flow field. The natural vibration cha...

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Problems solved by technology

[0003] When the composite material propeller rotates in the fluid, it will be subjected to the comprehensive action of the excitation force such as centrifugal force, hydrodynamic force, temperature difference, and vibration. The response amplitude of the composite material propeller blade changes with the vibration frequency of the excitation force. When applied When the vibration frequency of the external force is close to the natural frequency of the composite material propeller, resonance will occur, which will cause fatigue damage, reduce the service life and propulsion efficiency of the composite material propeller, and in severe cases, composite material propeller fracture accidents will occur

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