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Vibration analysis of rotating pretwist FG sandwich blades operating in thermal environment
International Journal of Mechanical Sciences ( IF 7.3 ) Pub Date : 2021-06-16 , DOI: 10.1016/j.ijmecsci.2021.106596
Yukun Chen , Tiangui Ye , Guoyong Jin , Shanjun Li , Chuanmeng Yang

In this work, the vibration characteristics of the rotating pretwist functionally graded (FG) sandwich blades operating in the thermal environment are studied for the first time. The FG sandwich blade is composed of a single metallic core combined with two FG surface layers and is assumed to be in a steady-state temperature field. The material properties of the FG sandwich blade are temperature-dependent. Based on the first-shear deformation shell theory (FSDST) and modified Fourier spectral approach (MFSA), a two-stage solving process is presented for the thermo-elastic vibration analysis of the rotating FG sandwich blades. For the first stage, a quasi-static analysis of the pretwist FG sandwich blade enduring both the centrifugal and thermal loadings is carried out to accurately predict the initial thermo-mechanical stresses. For the second stage, the vibration analysis of the rotating pretwist FG sandwich blade is performed taking into consideration the thermo-mechanical prestress effect. The correctness of the theoretical model is verified by comparing the present results with the reference data and solutions of the finite element method (FEM). The vibration results and distinguished mode shapes are given for the rotating pretwist FG sandwich blades with different temperature fields, rotating conditions and material distributions. Parameter studies indicated that the temperature rise, rotating speed, layer thickness ratio, volume fraction index, pretwist angle and presetting angle have significant influences on the dynamic characteristics of the rotating pretwist FG sandwich blades.



中文翻译:

热环境下旋转预扭 FG 夹层叶片的振动分析

在这项工作中,首次研究了在热环境中运行的旋转预扭曲功能梯度(FG)夹层叶片的振动特性。FG 夹层叶片由单个金属芯和两个 FG 表面层组成,假设处于稳态温度场。FG 夹层叶片的材料特性取决于温度。基于第一剪切变形壳理论(FSDST)和修正傅立叶谱方法(MFSA),提出了旋转FG夹层叶片热弹性振动分析的两阶段求解过程。对于第一阶段,对承受离心载荷和热载荷的预扭曲 FG 夹层叶片进行准静态分析,以准确预测初始热机械应力。对于第二阶段,考虑热机械预应力效应对旋转预扭 FG 夹层叶片进行振动分析。通过将现有结果与有限元法(FEM)的参考数据和解进行比较,验证了理论模型的正确性。给出了具有不同温度场、旋转条件和材料分布的旋转预扭 FG 夹层叶片的振动结果和显着的模态振型。参数研究表明,温升、转速、层厚比、体积分数指数、预扭角和预调角对旋转预扭FG夹层叶片的动力学特性有显着影响。旋转预扭 FG 夹层叶片的振动分析是在考虑热机械预应力效应的情况下进行的。通过将现有结果与有限元法(FEM)的参考数据和解进行比较,验证了理论模型的正确性。给出了具有不同温度场、旋转条件和材料分布的旋转预扭 FG 夹层叶片的振动结果和显着的模态振型。参数研究表明,温升、转速、层厚比、体积分数指数、预扭角和预调角对旋转预扭FG夹层叶片的动力学特性有显着影响。旋转预扭 FG 夹层叶片的振动分析是在考虑热机械预应力效应的情况下进行的。通过将现有结果与有限元法(FEM)的参考数据和解进行比较,验证了理论模型的正确性。给出了具有不同温度场、旋转条件和材料分布的旋转预扭 FG 夹层叶片的振动结果和显着的模态振型。参数研究表明,温升、转速、层厚比、体积分数指数、预扭角和预调角对旋转预扭FG夹层叶片的动力学特性有显着影响。通过将现有结果与有限元法(FEM)的参考数据和解进行比较,验证了理论模型的正确性。给出了具有不同温度场、旋转条件和材料分布的旋转预扭 FG 夹层叶片的振动结果和显着的模态振型。参数研究表明,温升、转速、层厚比、体积分数指数、预扭角和预调角对旋转预扭FG夹层叶片的动力学特性有显着影响。通过将现有结果与有限元法(FEM)的参考数据和解进行比较,验证了理论模型的正确性。给出了具有不同温度场、旋转条件和材料分布的旋转预扭 FG 夹层叶片的振动结果和不同的模态振型。参数研究表明,温升、转速、层厚比、体积分数指数、预扭角和预调角对旋转预扭FG夹层叶片的动力学特性有显着影响。给出了具有不同温度场、旋转条件和材料分布的旋转预扭 FG 夹层叶片的振动结果和显着的模态振型。参数研究表明,温升、转速、层厚比、体积分数指数、预扭角和预调角对旋转预扭FG夹层叶片的动力学特性有显着影响。给出了具有不同温度场、旋转条件和材料分布的旋转预扭 FG 夹层叶片的振动结果和显着的模态振型。参数研究表明,温升、转速、层厚比、体积分数指数、预扭角和预调角对旋转预扭FG夹层叶片的动力学特性有显着影响。

更新日期:2021-06-16
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