An electromagnetic torsion active vibration absorber based on the FxLMS algorithm

Adaptive active vibration control (AAVC) is an effective way for reducing structure vibration at low frequency. AAVC methodology is preferred in AVC system due to its self-adjustment ability to adapt to varying dynamics of the structure. The Filtered-X Least Mean Square (FXLMS) algorithm is widely implemented in active control applications. Accurate secondary path models are very crucial for the implementation in multichannel AAVC system based on FXLMS algorithm. The auxiliary random noise technique is often applied to achieve secondary path modeling (SPM) during online operation. This paper proposes a new multichannel AAVC methodology based on online SPM method. The online SPM error is estimated indirectly to reduce the interaction between the AAVC controller and the online SPM filter. A new variable step-size (VSS) strategy for online SPM filter is proposed based on the estimated online SPM error. A simple but effective auxiliary noise power scheduling (ANPS) method is proposed to eliminate the contribution of the auxiliary noise on the residual vibration. A series of multi-channel AAVC experiments on a cantilever epoxy resin plate with PZT sensors and actuators are presented to demonstrate the performance of the proposed methodology. Experiment results indicate that the proposed method provides very good online SPM accuracy, and the vibration of the smart cantilever plate has been effectively attenuated with high convergence rate.

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Development of Antiresonance Enforced Active Vibration Absorber System

JSME international journal Ser C Dynamics control robotics design and manufacturing ◽

10.1299/jsmec1993.39.464 ◽

1996 ◽

Vol 39 (3) ◽

pp. 464-469 ◽

Cited By ~ 4

Author(s):

Masashi Yasuda ◽

Rongrong Gu ◽

Osamu Nishihara ◽

Hiroshi Matsuhisa ◽

Kunio Ukai ◽

...

Keyword(s):

Vibration Absorber ◽

Active Vibration

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On Adaptive-Passive Vibration Suppression Using Distributed-Parameter Absorbers

10.1115/imece2000-1781 ◽

2000 ◽

Author(s):

Nader Jalili

Keyword(s):

Vibration Suppression ◽

Excitation Frequency ◽

Wide Band ◽

Distributed Parameter ◽

Vibration Absorber ◽

Frequency Bandwidth ◽

Lumped Mass ◽

Adaptive Capability ◽

Active Vibration ◽

Tuning Strategy

Abstract A semi-active vibration absorber with adaptive capability is presented to improve wide band vibration suppression characteristics of harmonically excited structures. The absorber subsection consists of a double-ended cantilever beam carrying an intermediate lumped mass. The adaptive capability is achieved through concurrent adjustment of the position of the moving mass, along the beam, to comply with the desired optimal performance. If such an absorber is attached to a vibrating body, it effectively absorbs vibrations at all frequencies that belong to the absorber frequency bandwidth. Numerical simulations are provided to verify the effectiveness of the proposed absorption scheme. It is shown that the tuning strategy tries to follow and match the absorber natural frequency with the excitation frequency. The optimally tuned absorber provides considerable vibration suppression improvement over the passive and de-tuned absorbers, for wide band excitation disturbances.

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