相似理论下的桨-轴系统振动特性分析
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武汉理工大学

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Analysis of vibration characteristics of propeller-shaft system based on similarity theory
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武汉理工大学

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The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    为了更好的了解桨-轴系统的振动特性,以某桨-轴系统为研究对象,基于Ansys Workbench平台下多个模块建立仿真分析,对缩尺模型下的桨-轴系统计入水压力和离心力的振动进行研究。桨-轴系统振动相似性的研究采用了原尺寸模型与缩比尺寸模型,分别求解其固有频率、振型及幅频曲线进行相似性验证。将验证正确后的缩比模型进行考虑水压力与离心力的振动特性研究;水压力通过利用Fluent模块对螺旋桨进行敞水计算,然后将计算后的结果采用单向流固耦合的方法进行加载;离心力的模拟通过设置不同的旋转速度来实现;谐响应分析采用模态叠加法进行计算。研究表明,缩尺模型在固有频率、振型及幅频曲线上的结果与原模型计算结果基本一致。计入水压力与离心力时的桨-轴系统固有频率会有所降低;水压力的作用对桨-轴系统的纵向固有频率影响较大;离心力对桨-轴系统固有频率的影响不明显。

    Abstract:

    In order to better understand the vibration characteristics of the propeller-shaft system, a propeller-shaft system was taken as the research object, and the simulation analysis was established based on several modules under ANSYS Workbench platform. The vibration of the propeller-shaft system under the scale model was studied considering the water pressure and centrifugal force. The full-size model and the reduced size model were used to investigate the vibration similarity of the propeller-shaft system, and the natural frequency, mode shape and amplitude-frequency curves were solved respectively to verify the similarity. The vibration characteristics of water pressure and centrifugal force were considered in the verified shrinkage model. The open water pressure of the propeller is calculated by using the Fluent module, and then the calculated results are loaded by unidirectional fluid-structure coupling method. The simulation of centrifugal force is realized by setting different rotation speeds. The harmonic response analysis was calculated by the modal superposition method. The results of natural frequency, mode shape and amplitude-frequency curves of the scaling model are basically consistent with those of the original model. When water pressure and centrifugal force are included, the natural frequency of the propeller-shaft system will be reduced. The effect of water pressure has a great influence on the longitudinal natural frequency of the paddle-shaft system. The influence of centrifugal force on the natural frequency of the propeller-shaft system is not obvious.

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  • 收稿日期:2021-05-31
  • 最后修改日期:2021-06-18
  • 录用日期:2021-06-21
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