Effect of Parametric Force on the Chaotic Behaviour of Flexible Rotor System Under the Influence of Mass Unbalanced

Flexible multistage rotor systems have a variety of engineering applications. Vibration optimization is important to the improvement of performance and reliability for this type of rotor systems. Filling a technical gap in the literature, this paper presents a virtual bearing method for optimal bearing placement that minimizes the vibration amplitude of a flexible rotor system with a minimum number of bearings. In the development, a distributed transfer function formulation is used to define the optimization problem. Solution of the optimization problem by a real-coded genetic algorithm yields the locations and dynamic coefficients of bearings, by which the prescribed operational requirements for the rotor system are satisfied. A numerical example shows that the proposed optimization method is efficient and accurate, and is useful in preliminary design of a new rotor system with the number of bearings unforeknown.

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Characteristic Parameters Estimation of Uncertainties Present in an Active Magnetic Bearing Integrated Flexible Rotor System Using Dynamic Reduction Technique

Mechanisms and Machine Science - Proceedings of the 10th International Conference on Rotor Dynamics – IFToMM ◽

10.1007/978-3-319-99272-3_17 ◽

2018 ◽

pp. 234-248 ◽

Cited By ~ 1

Author(s):

Sampath Kumar Kuppa ◽

Mohit Lal

Keyword(s):

Magnetic Bearing ◽

Reduction Technique ◽

Rotor System ◽

Parameters Estimation ◽

Active Magnetic Bearing ◽

Flexible Rotor ◽

Characteristic Parameters ◽

Estimation Of Uncertainties

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Effect of the Supports’ Positions on the Vibration Characteristics of a Flexible Rotor Shafting

Shock and Vibration ◽

10.1155/2020/1592794 ◽

2020 ◽

Vol 2020 ◽

pp. 1-11

Author(s):

Miaomiao Li ◽

Zhuo Li ◽

Liangliang Ma ◽

Rupeng Zhu ◽

Xizhi Ma

Keyword(s):

Finite Element ◽

Finite Element Simulation ◽

Vibration Characteristics ◽

Rotor System ◽

Experimental Investigations ◽

Flexible Rotor ◽

Bending Vibration ◽

First Order ◽

Element Simulation

In this study, we evaluated the effect of changing supports’ position on the vibration characteristics of a three-support flexible rotor shafting. This dependency was first analyzed using a finite element simulation and then backed up with experimental investigations. By computing a simplified rotor shafting model, we found that the first-order bending vibration in a forward whirl mode is the most relevant deforming mode. Hence, the effect of the supports’ positions on this vibration was intensively investigated using simulations and verified experimentally with a house-made shafting rotor system. The results demonstrated that the interaction between different supports can influence the overall vibration deformation and that the position of the support closer to the rotor has the greatest influence.

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Active Vibration Control of a Non-collocated AMBs Flexible Rotor System to Pass the First Bending Critical Speed

2019 22nd International Conference on Electrical Machines and Systems (ICEMS) ◽

10.1109/icems.2019.8922473 ◽

2019 ◽

Author(s):

Peipei Wang ◽

Changsheng Zhu

Keyword(s):

Vibration Control ◽

Critical Speed ◽

Active Vibration Control ◽

Rotor System ◽

Flexible Rotor ◽

Active Vibration

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Nonlinear dynamic response and transmissibility of a flexible rotor system mounted on viscoelastic elements

Nonlinear Dynamics ◽

10.1007/s11071-019-05078-3 ◽

2019 ◽

Vol 97 (2) ◽

pp. 1581-1600 ◽

Cited By ~ 3

Author(s):

Mohammed Khair Al-Solihat ◽

Kamran Behdinan

Keyword(s):

Dynamic Response ◽

Nonlinear Dynamic ◽

Rotor System ◽

Flexible Rotor ◽

Nonlinear Dynamic Response

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Robust Control of the Elastodynamic Vibrations of a Flexible Rotor System With Discontinuous Friction

Journal of Vibration and Acoustics ◽

10.1115/1.4003401 ◽

2011 ◽

Vol 133 (3) ◽

Cited By ~ 3

Author(s):

Mansour Karkoub

Keyword(s):

Dynamic Model ◽

Design Process ◽

Nonlinear Models ◽

Control Design ◽

Rotor System ◽

Control Technique ◽

Flexible Rotor ◽

Highly Nonlinear ◽

Modeling Errors ◽

The Difference

The work presented here deals with the control of a flexible rotor system using the μ-synthesis control technique. This technique allows for the inclusion of modeling errors in the control design process in terms of uncertainty weights. The dynamic model of the rotor system, which includes discontinuous friction, is highly nonlinear and has to be linearized around an operating point in order to use μ-synthesis. The difference between the linear and nonlinear models is characterized in terms of uncertainty weights and included in the control design process. The designed controller is robust to uncertainty in the dynamic model, spillover, actuator uncertainty, and noise. The theoretical findings of the μ-synthesis control design are validated through simulations and the results are presented and discussed here.

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