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research-article

An Enhanced Axisymmetric Solid Element for Rotor Dynamic Model Improvement

[+] Author and Article Information
Lingnan Hu

3304 Dixon Ln Apt 247 Kokomo, IN 46902 lingnan.hu@gmail.com

Alan Palazzolo

Mechanical Engineering MS3123 College Station, TX 77843 a-palazzolo@tamu.edu

1Corresponding author.

Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the Journal of Vibration and Acoustics. Manuscript received June 27, 2018; final manuscript received March 30, 2019; published online xx xx, xxxx. Assoc. Editor: Matthew Brake.

ASME doi:10.1115/1.4043411 History: Received June 27, 2018; Accepted April 01, 2019

Abstract

The authors present an improved formulation for the axisymmetric solid harmonic finite element (FE) modeling of a flexible, spinning rotor. A thorough comparison of beam-type FE and axisymmetric solid FE rotor models is presented, indicating the errors that result from beam FE usage for various non-dimensional rotor topologies. The axisymmetric rotor is meshed in only two dimensions: axial and radial, with both displacement fields being represented with Fourier series expansions. Centrifugal stress-stiffening and spin-softening effects are included in all elements and most importantly in modelling flexible disks. Beam FE and axisymmetric FE natural frequencies, mode shapes, and critical speeds are compared to identify shaft geometries where the beam model yields significant error. Finally, limitations of beam FE models and guidance for utilizing axisymmetric solid FE models in rotor dynamic simulations are provided.

Copyright © 2019 by ASME
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