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首页> 美国卫生研究院文献>Materials >Effect of Corrosion on the Natural and Whirl Frequencies of a Functionally Graded Rotor-Bearing System Subjected to Thermal Gradients
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Effect of Corrosion on the Natural and Whirl Frequencies of a Functionally Graded Rotor-Bearing System Subjected to Thermal Gradients

机译：腐蚀对热梯度的功能梯度转子系统自然和旋转频率的影响

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摘要

Corrosion causes a loss of material resulting in the reduction of mass and stiffness of a component, which consequently affects the dynamic characteristics of any system. Fundamental frequency analysis of a corroded functionally graded (FG) rotor system, using the finite element method based on the Timoshenko beam theory, was investigated in the present paper. The functionally graded shaft consisting of an inner metallic core and an outer ceramic layer was considered with the radial gradation of material properties based on the power law. Nonlinear temperature distribution (NLTD) based on the Fourier law of heat conduction was used to simulate the thermal gradient through the cross-section of the FG rotor. The finite element formulation for a functionally graded shaft with a corrosion defect was developed and the dynamic characteristics were investigated, which is the novelty of the present work. The corrosion parameters such as length, depth and position of the corrosion defect in the shaft were varied and a parametric study was performed to investigate changes in the natural and whirl frequencies. An analysis was carried out for different power indexes and temperature gradients of the functionally graded shaft. The effects of corrosion were analysed and important conclusions are drawn from the investigations.
机译：腐蚀导致材料的损失导致成分的质量和刚度的降低，从而影响了任何系统的动态特性。在本文中研究了使用基于Timoshenko光束理论的有限元法的腐蚀功能梯度（FG）转子系统的基本频率分析。通过基于电力法的材料特性的径向灰度考虑由内金属芯和外陶瓷层组成的功能渐变轴。基于傅立叶热传导定律的非线性温度分布（NLTD）用于通过FG转子的横截面来模拟热梯度。开发了具有腐蚀缺陷的功能渐变轴的有限元配方，并研究了动态特性，这是本作本作的新颖性。改变轴上腐蚀缺陷的长度，深度和位置的腐蚀参数，并进行参数研究以研究天然和旋转频率的变化。对功能梯度轴的不同功率指标和温度梯度进行了分析。分析了腐蚀的影响，并从调查中抽出了重要的结论。

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