Free Vibration Analysis of a Thermally Loaded Porous Functionally Graded Rotor–Bearing System
| Autor: | Angelo Maligno, Bharath Obalareddy, Prabhakar Sathujoda, Roberto Guglielmo Citarella, Giacomo Canale, Aneesh Batchu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Timoshenko beam theory
Materials science porosity media_common.quotation_subject finite element method functionally graded rotor 02 engineering and technology Inertia lcsh:Technology lcsh:Chemistry 0203 mechanical engineering General Materials Science Composite material whirl frequency Porosity Instrumentation lcsh:QH301-705.5 media_common Fluid Flow and Transfer Processes power law lcsh:T Process Chemistry and Technology General Engineering 021001 nanoscience & nanotechnology Thermal conduction Finite element method lcsh:QC1-999 Computer Science Applications non-linear temperature distribution Vibration 020303 mechanical engineering & transports lcsh:Biology (General) lcsh:QD1-999 lcsh:TA1-2040 Volume fraction 0210 nano-technology Material properties lcsh:Engineering (General). Civil engineering (General) lcsh:Physics |
| Zdroj: | Applied Sciences, Vol 10, Iss 8197, p 8197 (2020) Applied Sciences Volume 10 Issue 22 |
| Popis: | The present work deals with natural and whirl frequency analysis of a porous functionally graded (FG) rotor&ndash bearing system using the finite element method (FEM). Stiffness, mass and gyroscopic matrices are derived for porous and non-porous FG shafts by developing a novel two-noded porous FG shaft element using Timoshenko beam theory (TBT), considering the effects of translational inertia, rotatory inertia, gyroscopic moments and shear deformation. A functionally graded shaft whose inner core is comprised of stainless steel (SS) and an outer layer made of ceramic (ZrO2) is considered. The effects of porosity on the volume fractions and the material properties are modelled using a porosity index. The non-linear temperature distribution (NLTD) method based on the Fourier law of heat conduction is used for the temperature distribution in the radial direction. The natural and whirl frequencies of the porous and non-porous FG rotor systems have been computed for different power law indices, volume fractions of porosity and thermal gradients to investigate the influence of porosity on fundamental frequencies. It has been found that the power law index, volume fraction of porosity and thermal gradient have a significant influence on the natural and whirl frequencies of the FG rotor&ndash bearing system. |
| Databáze: | OpenAIRE |
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