Magnetic Nonlinear Energy Sink for Vibration Attenuation of Unbalanced Rotor System

Yao, Hongliang; Zheng, Dewen; Wen, Bangchun

doi:10.1155/2017/4132607

Cited by 15 publications

(9 citation statements)

References 26 publications

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“…e Muszynska fluid force model is used for the nonlinear seal force [2,34] and equivalently acts on the disk. e DVA is attached on the shaft by the rolling bearing with the frame [19][20][21], so it does not rotate with the rotor. e DVA is added in the horizontal and vertical directions, respectively.…”

Section: Model Of Rotor/seal System With Dvamentioning

confidence: 99%

“…is DVA has no such restriction. For the vibration attenuation of the unbalance rotor system in the resonance region, it has been compared between the DVA and NES in Reference [20]. Both DVA and NES can reduce the amplitude of the rotor system in the resonance region, but the system with the DVA has two large amplitude areas in the resonance region, while the system with the NES only has one large amplitude area which is in the resonance region.…”

Section: Nonlinear Characteristics Of Rotor/seal System With the Dvamentioning

confidence: 99%

“…e unbalance and torsional vibrations have been attenuated using the DVAs. Yao et al [19,20] proposed the negative stiffness DVA and magnetic NES to attenuate the unbalance vibration in the rotor system. e negative stiffness DVA and magnetic NES had better performance over a wider frequency range than the linear DVA.…”

Section: Introductionmentioning

confidence: 99%

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Fluid‐Induced Vibration Elimination of a Rotor/Seal System with the Dynamic Vibration Absorber

Niu

Yao

et al. 2018

Shock and Vibration

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The dynamic vibration absorbers have been applied to attenuate the rotor unbalance and torsional vibrations. The major purpose of this paper is to research the elimination of the fluid-induced vibration in the rotor/seal system using the absorber. The simplified rotor model with the absorber is established, and the Muszynska fluid force model is employed for the nonlinear seal force. The numerical method is used for the solutions of the nonlinear differential equations. The nonlinear responses of the rotor/seal system without and with the absorber are obtained, and then the rotating speed ranges by which the fluid-induced instability can be eliminated completely and partially are presented, respectively. The absorber parameters ranges by which the instability vibration can be eliminated completely and partially are obtained. The results show that the natural frequency vibration due to the fluid-induced instability in the rotor/seal system can be eliminated efficiently using the absorber. The appropriate natural frequency and damping ratio of the absorber can extend the complete elimination region of the instability vibration and postpone the occurrence of the instability vibration.

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Section: Model Of Rotor/seal System With Dvamentioning

confidence: 99%

Section: Nonlinear Characteristics Of Rotor/seal System With the Dvamentioning

confidence: 99%

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Fluid‐Induced Vibration Elimination of a Rotor/Seal System with the Dynamic Vibration Absorber

Niu

Yao

et al. 2018

Shock and Vibration

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“…Zhang et al [23] presented a new design for an NES which can realize vibration control and energy harvesting and realized efficient vibration control. Yao et al [24] studied the vibration attenuation performance of the NES for the unbalanced rotor system and verified the NES has better performance over a wider frequency range than the linear absorber.…”

Section: Introductionmentioning

confidence: 99%

Optimal Semiactive Damping Control for a Nonlinear Energy Sink Used to Stabilize Milling

Chen

2020

Shock and Vibration

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Improving product quality of machining components has always met with problems due to the vibration of the milling machine’s spindle, which can be reduced by adding a vibration absorber. The tuned vibration absorber (TVA) has been studied extensively and found to have a narrow bandwidth, but the cutting force possesses wide bandwidth in the process of machining parts. Introducing nonlinearity into the dynamic vibration absorber can effectively increase the bandwidth of vibration suppression and can significantly improve the robustness of the vibration absorber. In addition, a semiactive TVA has proved to be more effective than a passive TVA for many applications, so the main purpose of this study is to find some appropriate semiactive control methods for a nonlinear energy sink (NES), a nonlinear vibration absorber, in structural vibration applications. Two semiactive control methods are considered in this study: continuous groundhook damping control based on velocity and on-off groundhook damping control based on velocity. To fairly compare these vibration absorbers, the optimal parameters of a passive TVA, a passive NES, and two semiactive NESs are designed using numerical optimization techniques to minimize the root-mean-square acceleration. Two cutting forces are introduced in this study, a periodic force and an aperiodic force, and the four vibration absorbers are compared. When the primary structure is excited with aperiodic cutting force, the amplitude of the primary structure decreased by 17.73% with the passive TVA, by 72.29% with the passive NES, by 73.54% with the on-off NES, and by 87.54% with the continuous NES. When the primary structure is excited with periodic cutting force, the amplitude of the primary structure decreased by 49.01% with a passive TVA, by 86.93% with a passive NES, by 96.38% with an on-off NES, and by 99.23% with a continuous NES. The results show that the passive NES is better than the passive TVA; the semiactive NES provides more effective vibration attenuation than the passive NES, and the continuous control is more effective than the on-off control.

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“…Then, the DVA is mounted on the shaft by the rolling bearing with the frame in the horizontal and vertical directions, respectively. 22,24,30 So, it does not rotate with the rotor.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear dynamic behavior and stability of a rotor/seal system with the dynamic vibration absorber

Niu

Yao

et al. 2019

Advances in Mechanical Engineering

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The dynamic vibration absorbers have been applied to attenuate the critical or unbalanced vibration but may create the fluid-induced vibration instability in the rotor/seal system. The major purpose of this study is devoted to the effects of the dynamic vibration absorber on the nonlinear dynamic behavior and stability of the fluid-induced vibration in the rotor/seal system. The dynamic vibration absorber is attached on the shaft in the perpendicular directions. The model of the rotor/seal-dynamic vibration absorber system is established as the modified Jeffcott rotor system, and Muszynska nonlinear seal force is applied. The numerical method is used for the dynamic behavior analysis. The effects of the natural frequency and damping ratio of the dynamic vibration absorber on the dynamic behavior are discussed. The stability of the rotor/seal-dynamic vibration absorber system is judged by the eigenvalue theory. The variations of the instability threshold with the parameters of the dynamic vibration absorber are obtained. The results show that the instability threshold and instability vibration frequency are changed by the dynamic vibration absorber. The parameters of the dynamic vibration absorber must be selected carefully to avoid reducing the instability threshold and causing the instability vibration to occur in advance when the dynamic vibration absorber is applied to attenuate the critical or unbalanced vibration of the rotor/seal system.

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Magnetic Nonlinear Energy Sink for Vibration Attenuation of Unbalanced Rotor System

Cited by 15 publications

References 26 publications

Fluid‐Induced Vibration Elimination of a Rotor/Seal System with the Dynamic Vibration Absorber

Fluid‐Induced Vibration Elimination of a Rotor/Seal System with the Dynamic Vibration Absorber

Optimal Semiactive Damping Control for a Nonlinear Energy Sink Used to Stabilize Milling

Nonlinear dynamic behavior and stability of a rotor/seal system with the dynamic vibration absorber

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