Suppression of Persistent Rotor Vibrations Using Adaptive Techniques

Matras, Alex; Flowers, George T.; Fuentes, Robert J.; Balas, Mark J.; Fausz, Jerry L.

doi:10.1115/1.2345668

Cited by 16 publications

(3 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Complex orbit features including asymmetric bounce and rub were produced without detailed nonlinear analysis and modelling. Matras et al (2006) examined a magnetic-bearingsupported rotor system's adaptive disturbance rejection mechanism. The method was comparable to Sacks' and Bodson's method for rejecting persistent excitations in large space structures, but it was better for MIMO systems.…”

Section: Review Of Experimental Investigationmentioning

confidence: 99%

Study of active magnetic bearings (AMB) on non–synchronous rotors

Teyi

Singh

2022

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

A rotor is never free from vibration owing to constant centrifugal force acting on it while rotating. A practical rotor has inherent mass unevenness flaw, or bearing misalignment flaw, or self-weight bow flaw, or presence of discontinuity or cracks flaw. If the vibrations are not controlled within limits, the rotor’s purpose of existence is lost. These vibrations can be synchronous if the frequency of vibration is equal to, or multiple of, the speed of rotation of the rotor. Or may be non-synchronous if the frequency of vibration of the rotor is not a multiple of its rotational frequency. Active magnetic bearings (AMBs) have been in use for vibration control, vibration suppression, rotor stability and condition monitoring of rotordynamic systems, since many years. A lot of authors have performed various numerical and experimental works in an AMB–rotor configuration and reported their findings. The goal of this paper is to report and present the effect of AMB solely on non–synchronous rotors for the benefit of the scientific community. Firstly, this paper briefly introduces the constructional features on AMB–rotor system. Then, the gist of every paper is written, as well as specification of the work provided in tabular form. Finally, some comments on limitations and future applications are made. The paper is separately sectioned into numerical investigations, and experimental investigations.

show abstract

Section: Review Of Experimental Investigationmentioning

confidence: 99%

Study of active magnetic bearings (AMB) on non–synchronous rotors

Teyi

Singh

2022

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

show abstract

“…The previous literature about the imbalance vibration control for magnetically suspended rotors mainly investigated mass imbalance identification (Lum et al, 1996;Liu et al, 2008;Jiang et al, 2012), null displacement control (Herzog et al, 1996;Shi et al, 2002;Huang and Lin, 2004;Matras et al, 2006;Grochmal and Lynch, 2007) and null vibration control (Li et al, 2003(Li et al, , 2002Wei and Xiang, 2012;Fang et al, 2013a,b;Xu et al, 2013). Liu et al (2008) regard the static mass imbalance as a displacement disturbance, and a neural network observer is employed to observe the mass imbalance.…”

Section: Introductionmentioning

confidence: 99%

Static mass imbalance identification and vibration control for rotor of magnetically suspended control moment gyro with active-passive magnetic bearings

Cui

Fang

2014

Journal of Vibration and Control

View full text Add to dashboard Cite

Identification of the static mass imbalance is critical to the control of magnetically suspended rotors. A static mass imbalance identification method without using the closed-loop transfer function is proposed in this paper. Then the null displacement control of the magnetically suspended rotor is realized by using the identified static mass imbalance. Because null vibration is the control target for the rotor of a magnetically suspended control moment gyro (MSCMG) with active-passive magnetic bearings, a null vibration control method depending on the displacement stiffness is introduced. However, the displacement stiffness of the passive magnetic bearing is hard to obtain accurately. Therefore, the least mean square method is utilized to adjust the uncertain displacement stiffness adaptively according to the centroid acceleration. Simulation results show that adaptive null vibration control based on the static mass imbalance identification can remove the synchronous magnetic bearing force effectively, thus enabling the rotor of the MSCMG with active-passive magnetic bearings to rotate about its initial axis.

show abstract

“…A class of adaptive controllers has been developed and studied by Balas [14][15][16], one of the authors of this paper, and was successfully implemented to reject the persistent disturbance on flexible space structures [17] and suppress persistent rotor vibration [18]. Frost and Balas [19] extended this adaptive control theory to control the wind turbine rotor speed in the high-wind-speed region.…”

Section: Introductionmentioning

confidence: 99%

Adaptive State Feedback—Theory and Application for Wind Turbine Control

et al. 2017

Self Cite

View full text Add to dashboard Cite

A class of adaptive disturbance tracking controllers (ADTCs) is augmented with disturbance and state estimation and adaptive state feedback, in which a controller and estimator, which are designed on the basis of a lower-order model, are used to control a higher-order nonlinear plant. The ADTC requires that the plant be almost strict positive real (ASPR) to ensure stability. In this paper, we show that the ASPR property of a plant is retained with the addition of disturbance and state estimation and state feedback, thereby ensuring the stability of the augmented system. The proposed adaptive controller with augmentation is presented in the context of maximum power extraction from a wind turbine in a low-wind-speed operation region. A simulation and comparative study on the National Renewable Energy Laboratory's (NREL's) 5 MW nonlinear wind turbine model with an existing baseline Proportional-Integral-Derivative(PID) controller shows that the proposed controller is more effective than the existing baseline PID controller.Keywords: wind energy; adaptive control; wind turbine control; maximum power point tracking BackgroundElectrical energy generated from wind power is one of the major sources of renewable energy. The size of the wind turbine has to be large in order to reduce the cost of the energy; however, this increase in size comes with the cost of added weights in its structures [1]. For large wind turbines, the blade is one of the most important structures that needs to be considered for both fatigue life and weights. Using stiff materials to construct wind turbine blades increases the blade's life, but it also increases its weight significantly. This requires a larger foundation and tower to support the blades, which results in high installation costs and an increase in the cost of energy. On the other hand, using lightweight materials reduces the weight significantly, but the blade becomes highly flexible, which makes it prone to damage by different types of aerodynamic and structural loading. Stiffening the blade is not a viable option for a large wind turbine. However, advents in modern control theory have made it possible to reduce the blade loading significantly, thereby making a flexible blade design a viable option [2]. Besides blade loading, other structural loading, such as drivetrain and tower loading, also needs to be considered to increase the life span of the wind turbine, which directly affects the cost of energy. Maximizing the power captured while operating the wind turbine at a below-rated wind speed is another important aspect of a wind turbine control system [3]. Modern wind turbines are capable of operating at variable rotor speeds to accompany the maximum power point tracking algorithm.

show abstract

Suppression of Persistent Rotor Vibrations Using Adaptive Techniques

Cited by 16 publications

References 11 publications

Study of active magnetic bearings (AMB) on non–synchronous rotors

Study of active magnetic bearings (AMB) on non–synchronous rotors

Static mass imbalance identification and vibration control for rotor of magnetically suspended control moment gyro with active-passive magnetic bearings

Adaptive State Feedback—Theory and Application for Wind Turbine Control

Contact Info

Product

Resources

About