Vibration Control and Unbalance Estimation of a Nonlinear Rotor System Using Disturbance Observer

2009 ◽  
Vol 131 (3) ◽  
Author(s):  
Tsuyoshi Inoue ◽  
Jun Liu ◽  
Yukio Ishida ◽  
Yusuke Yoshimura
Keyword(s):  
Vibration Control ◽  
Disturbance Observer ◽  
Control Method ◽  
Rotor System ◽  
Control Force ◽  
Rotor Systems ◽  
Parameter Variations ◽  
Speed Range ◽  
Disturbance Term ◽  
Nonlinear Rotor System

In rotating machinery, rotor unbalance causes many resonances at critical speeds corresponding to different modes. In this paper, a vibration control method for rotor systems utilizing disturbance observer is proposed. The nonlinear terms, unbalance, parameter variations, and uncertain terms of a rotor system are lumped into a disturbance term, and this term is canceled by using disturbance observer. As a result, the vibrations are suppressed to small amplitudes all over the rotational speed range. Simultaneously, unbalance of the first mode is estimated from the information of control force of disturbance observer. Moreover, the effects of parameter errors of the control system are also investigated. The validity of the proposed method is verified through numerical simulations and experiments.

Vibration Control of a Nonlinear Rotor System through Electro-Magnetic Bearings

2012 ◽  
Vol 452-453 ◽  
pp. 1408-1414
Author(s):  
Jun Liu ◽  
Qiao Sun
Keyword(s):  
Vibration Control ◽  
Ball Bearing ◽  
Control Method ◽  
Nonlinear Effects ◽  
Magnetic Bearing ◽  
Rotor System ◽  
Delay Estimation ◽  
Rotor Imbalance ◽  
Speed Range ◽  
Electro Magnetic

In rotating machinery, vibration resonance with large amplitude and complex pattern occurs at critical speeds due to rotor imbalance and nonlinear effects. In this paper, a vibration control method is proposed for a rotor system supported by a ball bearing and an electro-magnetic bearing. In particular, a disturbance observer combined with the current delay estimation is implemented to improve the controller's ability of compensating for system's nonlinear effects and uncertainty. As a result, the rotor vibration is suppressed to very small amplitudes in the entire operating speed range. The proposed method is validated through numerical simulations and experiments.

646 Vibration Control of the Nonlinear Rotor System Using Disturbance Observer

2003 ◽  
Vol 2003 (0) ◽  
pp. _646-1_-_646-6_
Author(s):  
Tsuyoshi INOUE ◽  
Jun LIU ◽  
Yusuke YOSHIMURA ◽  
Yukio ISHIDA
Keyword(s):  
Vibration Control ◽  
Disturbance Observer ◽  
Rotor System ◽  
Nonlinear Rotor System

Electro-Rheological Multi-layer Squeeze Film Damper and Its Application to Vibration Control of Rotor System

1999 ◽  
Vol 122 (1) ◽  
pp. 7-11 ◽  
Author(s):  
Yao Guozhi ◽  
Yap Fook Fah ◽  
Chen Guang ◽  
Meng Guang ◽  
Fang Tong ◽  
...  
Keyword(s):  
Vibration Control ◽  
Large Amplitude ◽  
Critical Speed ◽  
Reynolds Equation ◽  
Control Method ◽  
Rotor System ◽  
Squeeze Film ◽  
Squeeze Film Damper ◽  
Unbalance Response ◽  
Er Damper

In this paper, a new electro-rheological multi-layer squeeze film damper (ERMSFD in short) is designed first and the constitutional Reynolds equation is established. Then the behavior of the rotor system is analyzed, the vibration around the first critical speed is suppressed and an on/off control is proposed to control the large amplitude around the first critical speed. A control method is used to suppress the sudden unbalance response. Finally, experiments are carried out to investigate the behavior of the rotor system to prove the effectiveness of the ER damper to suppress the vibration around the critical speed and the sudden unbalance response. [S0739-3717(00)00301-9]

Experiments on the Vibration Control of Flexible Rotor Using Shear Mode MR Elastomer Damper

2012 ◽  
Vol 215-216 ◽  
pp. 741-745 ◽  
Author(s):  
Jian Xiao Wang ◽  
Shi Wang Wang
Keyword(s):  
Magnetic Field ◽  
Vibration Control ◽  
Control Method ◽  
Silicone Oil ◽  
Active Vibration Control ◽  
Mr Damper ◽  
Rotor System ◽  
Shear Mode ◽  
Flexible Rotor ◽  
Critical Speeds

A shear mode magnetorheological (MR) elastomer damper is designed and manufactured, in which the MR elastomer is made by mixing RTV silicone, carbonyl iron particles and silicone oil, and solidifying under magnetic field. A flexible cantilever rotor system with single disk is constructed, and the controllability, effectiveness and stability of vibration control for the imbalance response of the rotor system using the MR damper are experimentally studied. From the test, it is found that as the strength of applied magnetic field increases, the damping and stiffness of the damper are increased; the critical speeds of the rotor system supported on the MR damper is increased distinctly, and the vibration at two critical speeds are restrained; the on-off control method may be used to control the rotor vibration while passing through the two critical speeds. The study shows that the shear mode MR elastomer damper is suitable for active vibration control of flexible rotor.

scholarly journals 509 Vibration Control of the Nonlinear Asymmetrical Rotor System Using Disturbance Observer

2004 ◽  
Vol 2004 (0) ◽  
pp. _509-1_-_509-6_
Author(s):  
Tsuyoshi INOUE ◽  
Yukio ISHIDA ◽  
Jim Liii ◽  
Kenji Gotouda
Keyword(s):  
Vibration Control ◽  
Disturbance Observer ◽  
Rotor System

Multi-order repetitive controller for harmonic current suppression in magnetically suspended rotor system

2020 ◽  
pp. 107754632096431
Author(s):  
Peiling Cui ◽  
Wensi Li ◽  
Xinxiu Zhou ◽  
Jinlei Li ◽  
Fanjun Zheng
Keyword(s):  
Control Method ◽  
Rotation Frequency ◽  
Industrial Applications ◽  
Rotor System ◽  
Harmonic Current ◽  
Suppression Effect ◽  
Rotor Systems ◽  
Control Moment ◽  
Control Moment Gyro ◽  
Repetitive Controller

Repetitive controllers are widely used in rotor systems of magnetically suspended control moment gyro, which are responsible for suppressing harmonic current because of sensor runout and mass imbalance of the rotor. However, the rotation frequency of the rotor is not constant in industrial applications, and it is likely to fluctuate around the rotation frequency, which greatly affects the suppression effect of the repetitive controller on harmonic current. This article proposes a new repetitive control method with strong frequency robustness, which still has high suppression accuracy when the rotation frequency is fluctuant. This method is simulated and verified on the magnetically suspended rotor system, which has achieved better results than previous research.

Method of Coupled Vibration Control for Dual Rotor System With Inter-Shaft Bearing

2021 ◽  
Author(s):  
Yanhong Ma ◽  
Chenglong Shi ◽  
Bo Sun ◽  
Jie Hong
Keyword(s):  
Vibration Control ◽  
Mode Coupling ◽  
Weight Ratio ◽  
Low Pressure ◽  
Rotor System ◽  
Coupled Vibration ◽  
Coupling Vibration ◽  
Rotor Systems ◽  
Modal Coupling ◽  
Coupling Characteristics

Abstract Structural layout scheme of dual rotor system with inter-shaft bearing plays an important role in reducing the bearing frame and structure weight of areo-engine. This kind of scheme is often used in the design of high thrust-weight ratio turbofan engine. However, the inter-shaft bearing will cause the direct interaction of the force and displacement between the high and low pressure rotor systems, contributing to the coupling of the dynamic characteristics of two rotor systems. The coupling may eventually lead to the failure of the rotor displacement control, loss of the robustness of the connection structure or excessive dynamic load of the bearing. The main purpose of this paper is to, firstly study and quantitatively evaluate the coupling characteristics of the dual rotor system, secondly obtain the correlation between the structural feature parameters such as the position of the inter-shaft bearing and the coupling vibration or interactive excitation characteristics of the system, finally propose the coupling vibration control method of dual rotor system. The dynamic model of dual rotor system with inter-shaft bearing is established. The modal frequencies and modes of dual rotor system with or without coupling are analyzed and compared. The results illustrate the complexity of coupled vibration of high pressure and low pressure rotors. Then modal coupling characteristics evaluation parameter of dual rotor system based on energy distribution relationship is proposed. Using the coupling factor defined, the correlation between the inter-shaft bearing support feature and the modal coupling characteristics is discussed. The results show that, placing the inter-shaft bearing near the mass center of low pressure turbine can effectively restrain the mode coupling, meanwhile the proportion of bearing strain energy can also reflect the mode coupling characteristics of dual rotor system to a certain extent. Then a method of controlling the response coupled vibration of dual rotor system with inter-shaft bearing, based on the principle of mode superposition, is proposed. An example verifies the method can control the response coupling vibration of dual rotor system in wide speed range and under complex excitation conditions.

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