Journal ArticleDOI
Computational Tradeoff in Modal Characteristics of Complex Rotor Systems Using FEM
Yehia A. Khulief,Fahad A. Al-Sulaiman,Abul Fazal M. Arif,Rached Ben-Mansour,Amro M. Al-Qutub,M. Anis +5 more
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TLDR
In this article, the modal characteristics of an actual multi-impeller rotor-bearing system with complicated geometry are estimated and verified using two modeling schemes, one based on a developed finite element elastodynamic model that accounts for gyroscopic effects, torsional-bending inertia coupling, internal material damping, shear and anisotropic bearings.Abstract:
Modal analysis of complex rotor-bearing systems using the finite element method (FEM) may become controversial when considering the tradeoff between geometric complexity and elastodynamic integrity of the FEM model. In this paper, the modal characteristics of an actual multi-impeller rotor-bearing system with complicated geometry are estimated and verified using two modeling schemes. The first scheme invokes a developed finite element elastodynamic model that accounts for gyroscopic effects, torsional-bending inertia coupling, internal material damping, shear and anisotropic bearings. In this model, the intricate details of the impeller were ignored, and only the inertial properties of the impeller disk are considered. The second scheme employs a general-purpose finite element code, wherein the complicated impeller geometry is included in lieu of ignoring some of the rotational effects and inertia coupling effects. The obtained results shed the light on the tradeoffs involved in modal analysis of complicated rotor systems using the FEM. Comparisons with experimental values showed that the first scheme, which adopts simplified impeller geometry while accounting for all the rotational effects is more accurate in estimating the modal characteristics of such complex rotor-bearing systems.read more
Citations
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Modal Analysis of a Thick-Disk Rotor with Interference Fit Using Finite Element Method
TL;DR: In this article, the modal analysis of a thick-disk rotor is performed to get the natural frequencies in ANSYS Workbench, in which the friction coefficient and interference fit are set to be the same as those of the finite element calculation method.
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Study on the vibration characteristics of a roller-supporting horizontal centrifugal casting machine
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References
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Journal ArticleDOI
Finite Element Simulation of Rotor-Bearing Systems With Internal Damping
E. S. Zorzi,H. D. Nelson +1 more
Journal ArticleDOI
XXVII. The lateral vibration of loaded shafts in the neighbourhood of a whirling speed.—The effect of want of balance
TL;DR: The lateral vibration of loaded shafts in the neighbourhood of a whirling speed was studied in this paper, where the effect of want of balance on the lateral vibration was considered. But the effect was limited to the case of a single shaft.