Nonparametric Stochastic Modeling of Uncertainty in Rotordynamics—Part I: FormulationSource: Journal of Engineering for Gas Turbines and Power:;2010:;volume( 132 ):;issue: 009::page 92501DOI: 10.1115/1.3204645Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A systematic and rational approach is presented for the consideration of uncertainty in rotordynamics systems, i.e., in rotor mass and gyroscopic matrices, stiffness matrix, and bearing coefficients. The approach is based on the nonparametric stochastic modeling technique, which permits the consideration of both data and modeling uncertainty. The former is induced by a lack of exact knowledge of properties such as density, Young’s modulus, etc. The latter occurs in the generation of the computational model from the physical structure as some of its features are invariably ignored, e.g., small anisotropies, or approximately represented, e.g., detailed meshing of gears. The nonparametric stochastic modeling approach, which is briefly reviewed first, introduces uncertainty in reduced order models through the randomization of their system matrices (e.g., stiffness, mass, and damping matrices of nonrotating structural dynamic systems). Here, this methodology is extended to permit the consideration of uncertainty in symmetric and asymmetric rotor dynamic systems. More specifically, uncertainties on the rotor stiffness (stiffness matrix) and/or mass properties (mass and gyroscopic matrices) are first introduced that maintain the symmetry of the rotor. The generalization of these concepts to uncertainty in the bearing coefficients is achieved next. Finally, the consideration of uncertainty in asymmetric rotors is described in detail.
keyword(s): Simulation , Algorithms , Modeling , Rotors , Stiffness , Uncertainty , Rotordynamics , Bearings AND Damping ,
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contributor author | Raghavendra Murthy | |
contributor author | Aly El-Shafei | |
contributor author | Marc P. Mignolet | |
date accessioned | 2017-05-09T00:37:32Z | |
date available | 2017-05-09T00:37:32Z | |
date copyright | September, 2010 | |
date issued | 2010 | |
identifier issn | 1528-8919 | |
identifier other | JETPEZ-27131#092501_1.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/143103 | |
description abstract | A systematic and rational approach is presented for the consideration of uncertainty in rotordynamics systems, i.e., in rotor mass and gyroscopic matrices, stiffness matrix, and bearing coefficients. The approach is based on the nonparametric stochastic modeling technique, which permits the consideration of both data and modeling uncertainty. The former is induced by a lack of exact knowledge of properties such as density, Young’s modulus, etc. The latter occurs in the generation of the computational model from the physical structure as some of its features are invariably ignored, e.g., small anisotropies, or approximately represented, e.g., detailed meshing of gears. The nonparametric stochastic modeling approach, which is briefly reviewed first, introduces uncertainty in reduced order models through the randomization of their system matrices (e.g., stiffness, mass, and damping matrices of nonrotating structural dynamic systems). Here, this methodology is extended to permit the consideration of uncertainty in symmetric and asymmetric rotor dynamic systems. More specifically, uncertainties on the rotor stiffness (stiffness matrix) and/or mass properties (mass and gyroscopic matrices) are first introduced that maintain the symmetry of the rotor. The generalization of these concepts to uncertainty in the bearing coefficients is achieved next. Finally, the consideration of uncertainty in asymmetric rotors is described in detail. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Nonparametric Stochastic Modeling of Uncertainty in Rotordynamics—Part I: Formulation | |
type | Journal Paper | |
journal volume | 132 | |
journal issue | 9 | |
journal title | Journal of Engineering for Gas Turbines and Power | |
identifier doi | 10.1115/1.3204645 | |
journal fristpage | 92501 | |
identifier eissn | 0742-4795 | |
keywords | Simulation | |
keywords | Algorithms | |
keywords | Modeling | |
keywords | Rotors | |
keywords | Stiffness | |
keywords | Uncertainty | |
keywords | Rotordynamics | |
keywords | Bearings AND Damping | |
tree | Journal of Engineering for Gas Turbines and Power:;2010:;volume( 132 ):;issue: 009 | |
contenttype | Fulltext |