Prediction Method of Prestressed Wet Mode of Composite Propeller Based on Acoustic-Structure Interaction
A technology of composite materials and prediction methods, applied in design optimization/simulation, geometric CAD, etc., can solve problems such as fatigue damage, composite propeller fracture accidents, reduced service life and propulsion efficiency of composite propellers, and achieve high-precision prediction, Effects that increase authenticity and believability
Active Publication Date: 2021-06-01
BEIJING INSTITUTE OF TECHNOLOGYGY
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[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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Embodiment 1
[0035] EXAMPLES For SEIUN-MARU large-slope ship propellers, the composite material propeller prestressed wet modal prediction method based on acoustic-solid coupling is applied to build a composite material propeller model, construct a flow field area, and complete the composite material propeller and flow field. The grid division of the field area, through the establishment of prestress, analysis and setting, finally obtained the prestress wet mode of the composite propeller based on the SEIUN-MARU large skew ship propeller, and accurately predicted the vibration and noise of the composite propeller. Composite propeller ply angle optimization realizes dynamic frequency modulation and hydroelastic analysis.
[0036] The model data of the SEIUN-MARU large skew ship propeller is completely open, and the main geometric parameters are shown in Table 1. It has been selected as an assessment example by several ITTC Ship Propeller Technical Committees.
[0037] Table 1 Geometric para...
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The invention relates to a composite material propeller prestressed wet mode prediction method based on sound-solid coupling, and belongs to the technical field of impeller mechanical simulation. Based on the finite element principle, the present invention realizes the fluid-structure coupling wet modal prediction of the composite propeller through the sound-structure coupling method. The area is meshed, the prestress is imported, the analysis parameters are set, and the modal analysis results are finally output, and the prestressed wet modal frequency and mode shape can be obtained. The invention can predict the actual vibration response of the composite material propeller under the action of various vibration sources, fully consider the influence of the additional mass of the fluid, can realize the high-precision prediction of the prestressed wet mode of the composite material propeller, and improve the authenticity of the prediction with credibility.
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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IPC IPC(8): G06F30/23G06F30/17
Inventor 王国玉鲁航张晶吴钦黄彪
Owner BEIJING INSTITUTE OF TECHNOLOGYGY