An Active Vibration Control Strategy to Prevent Nonlinearly Coupled Rotor–Stator Whirl Responses in Multimode Rotor-Dynamic Systems

Chamroon, Chakkapong; Cole, Matthew O. T.; Wongratanaphisan, Theeraphong

doi:10.1109/tcst.2013.2265740

Cited by 26 publications

(11 citation statements)

References 23 publications

(36 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The lifetime and maintenance of electrical machines are often strongly affected by mechanical bearings. The rate of bearing failure is related to rotor vibrations caused by the eccentricity, the unbalance magnetic pull and other forces of different nature [1]. Furthermore, several industrial applications, especially chemical processes, require a perfect sterile environment.…”

Section: Introductionmentioning

confidence: 99%

Smart Current Limitation Technique for a Multiphase Bearingless Machine with Combined Winding System

Wen

Valente

Formentini

et al. 2019

2019 IEEE Energy Conversion Congress and Exposition (ECCE)

View full text Add to dashboard Cite

This paper presents a current limitation technique for a multiphase bearingless machine featuring a combined winding system. This winding structure allows each machine phase to produce both suspension force and motoring torque. Compared to more conventional systems where two separate windings are adopted for the force and torque generation, the combined winding one leads to higher compactness and simpler manufacture. The main challenges with the combined winding configuration consist of decoupling the force and torque generation and designing a proper current limitation algorithm. The former topic has been already tackled and presented in previous publications, instead the latter will be addressed in this paper. In particular, the so called smart limitation technique will allow to prioritize either the suspension force or the torque generation. In this paper the priority is given to the rotor levitation, hence the suspension force rather than the torque is essential. The technique can be extended to give priority to the torque generation in further work and can be applied to any multiphase bearingless machine with similar winding structures. Finally, simulation results and experiment validation are provided.

show abstract

Section: Introductionmentioning

confidence: 99%

Smart Current Limitation Technique for a Multiphase Bearingless Machine with Combined Winding System

Wen

Valente

Formentini

et al. 2019

2019 IEEE Energy Conversion Congress and Exposition (ECCE)

View full text Add to dashboard Cite

show abstract

“…To maintain the safety operation of the rotating machinery, the vibration of rotor system must be controlled. Many methods are proposed to control the vibration of rotor system, such as adjusting stiffness [1] or damping, imposing external forces [2], or reducing the unbalance [3].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Nonlinear Energy Sink for Vibration Attenuation of Unbalanced Rotor System

Yao

Zheng

Wen

2017

Shock and Vibration

View full text Add to dashboard Cite

A novel nonlinear energy sink (NES) consisting of permanent magnetic springs and coil springs is proposed, and the vibration attenuation performance of the NES for unbalanced rotor system is investigated. Firstly, the nonlinearity of the magnet spring is analyzed and the structure of the NES is introduced. Then, the dynamic model of the rotor system with the NES is built, and the responses and stabilities of the system are studied by applying Complexification-averaging method. The strongly modulated responses (SMR) behavior, which is the most important performance characteristic of the NES, is analytically studied by combining Complexification-averaging method and multiscale method and numerically verified by Runge-Kutta method. The results show that the NES is effective in attenuating the vibration of unbalanced rotor, and the SMR occurrence range can be broadened by increasing the nonlinearity of the NES. And also, the NES has better performance over a wider frequency range than the linear absorber.

show abstract

“…Unbalance compensation for a single-disk rotor with nonlinear supports was considered by Inoue et al (2009). Control of synchronous vibration for a rotor supported by magnetic bearings when contacting with clearance bearings was investigated by Cole and Keogh (2003) and Chamroon et al, (2014), while active clearance bearings have also been Cole, Chamroon and Keogh, Mechanical Engineering Journal, Vol.4, No.5 (2017) [DOI: 10.1299/mej. proposed for a similar purpose in (Cade et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

H-infinity controller design for active magnetic bearings considering nonlinear vibrational rotordynamics

Cole

Chamroon

Keogh

2017

Mechanical Engineering Journal

Self Cite

View full text Add to dashboard Cite

This paper deals with optimal controller design for active magnetic bearing (AMB) systems for which nonlinear rotordynamic behavior is evident, and so vibration predicted by operating point linearization differs from that which occurs in actuality. Nonlinear H-infinity control theory is applied with a rotordynamic model involving nonlinear stiffness and/or damping terms. The associated Hamilton-Jacobi-Isaacs (HJI) equation is formulated and solved to obtain a state feedback control law achieving specified vibration attenuation performance in terms of the peak L 2 gain of the nonlinear system. The method is applied in case study to a flexible rotor/AMB system that exhibits nonlinear stiffness properties owing to rotor interaction with a clearance bearing. Simulations are performed to quantify RMS vibration due to harmonic disturbances and the results compared with the norm-bound values embedded in the HJI equations. A feedback controller design method is then presented that is similar in approach to the standard loop-shaping/mixed-sensitivity methods used for linear systems, and involves augmenting the system model with weighting transfer functions. Experiments are undertaken to compare controller performance for designs based on nonlinear and linearized models. The results highlight the shortcomings of applying linear optimal control methods with rotor systems exhibiting nonlinear stiffness properties as large amplitude vibration and loss of rotordynamic stability can occur. Application of the described nonlinear H-infinity control method is shown to overcome these problems, albeit at the expense of vibration attenuation performance for operation in linear regimes.

show abstract

An Active Vibration Control Strategy to Prevent Nonlinearly Coupled Rotor–Stator Whirl Responses in Multimode Rotor-Dynamic Systems

Abstract: Manuscript received ; accepted . Manuscript received in final form **.

Cited by 26 publications

References 23 publications

Smart Current Limitation Technique for a Multiphase Bearingless Machine with Combined Winding System

Smart Current Limitation Technique for a Multiphase Bearingless Machine with Combined Winding System

Magnetic Nonlinear Energy Sink for Vibration Attenuation of Unbalanced Rotor System

H-infinity controller design for active magnetic bearings considering nonlinear vibrational rotordynamics

Contact Info

Product

Resources

About

An Active Vibration Control Strategy to Prevent Nonlinearly Coupled Rotor–Stator Whirl Responses in Multimode Rotor-Dynamic Systems

Abstract: Manuscript received ******; accepted ******. Manuscript received in final form ******.

Cited by 26 publications

References 23 publications

Smart Current Limitation Technique for a Multiphase Bearingless Machine with Combined Winding System

Smart Current Limitation Technique for a Multiphase Bearingless Machine with Combined Winding System

Magnetic Nonlinear Energy Sink for Vibration Attenuation of Unbalanced Rotor System

H-infinity controller design for active magnetic bearings considering nonlinear vibrational rotordynamics

Contact Info

Product

Resources

About

Abstract: Manuscript received ; accepted . Manuscript received in final form **.