Topic
Active vibration control
About: Active vibration control is a research topic. Over the lifetime, 6770 publications have been published within this topic receiving 76599 citations. The topic is also known as: active vibration damping.
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TL;DR: In this paper, an adaptive controller that is designed specifically for tackling mesh frequency vibrations is based on an enhanced filtered-x least mean square algorithm with frequency estimation to synthesize the required reference signal.
Abstract: This paper analyzes the practicality of active internal shaft transverse vibration control using a piezoelectric stack actuator for reducing external gearbox housing structure response due to transmission error excitation from a gear pair. The proposed adaptive controller that is designed specifically for tackling mesh frequency vibrations is based on an enhanced filtered-x least mean square algorithm with frequency estimation to synthesize the required reference signal. The vital system secondary path characteristic that relates the actuation force to the housing response of interest is identified in offline or online mode using the additive random noise technique. Numerical studies employing practical design parameters in order to provide a realistic assessment of the proposed approach are performed for a geared rotor system (dynamic plant) that is represented as finite and lumped elements. The simulations reveal very promising vibration control results, which will be utilized to guide future experimental studies.
30 citations
TL;DR: In this paper, a rod cylinder based pneumatic driving scheme is proposed to suppress the vibration of a flexible smart beam, where the Pulse Code Modulation (PCM) method is employed to control the motion of the cylinder's piston rod for simultaneous positioning and vibration suppression.
30 citations
TL;DR: In this paper, a speed-varying transient rigid rotor model is developed in the state space form and the states of this model are augmented to include imbalance forces and moments.
Abstract: Rigid rotor dynamic model is widely used to model rotating machinery. In this paper, a speed-varying transient rigid rotor model is developed in the state space form. The states of this model are augmented to include imbalance forces and moments. A time-varying observer can then be designed for the augmented system by using canonical transformation. After obtaining an estimation of the imbalance forces and moments as the states of the augmented system, the estimated imbalance can be directly calculated. This estimation method can be used in the active vibration control or active balancing schemes for a rigid rotor.
30 citations
TL;DR: In this paper, a validated vibration characterisation strategy is proposed based on sensitivity analysis for improved vibration control of an ultrasonic metal forming process, and the result is a design procedure for improving the reliability of metal forming processes.
30 citations
TL;DR: In this article, the authors studied the vibration suppression of an end-capped cylindrical shell structure with surface bonded macro fiber composite actuators and found that structural vibration was reduced by adopting a proper negative velocity feedback control algorithm in both resonance and non-resonance regimes.
Abstract: We studied the vibration suppression of an end-capped cylindrical shell structure with surface bonded macro fiber composite actuators. The dynamic characteristics of the cylindrical shell structure were first analyzed, and then a negative velocity feedback algorithm was applied to suppress the structural vibration at resonance and nonresonance vibration frequencies. The modal mass and stiffness matrix of the smart cylindrical shell structure were extracted for the controller design. An active controller was designed to suppress vibration of the smart structure, and the control performance was evaluated in resonance and nonresonance regimes. It was found that structural vibration was reduced by adopting a proper negative velocity feedback control algorithm in both resonance and nonresonance regimes.
30 citations