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.

Adaptive Shape Control of Laminated Composite Plates Using Piezoelectric Materials

Abstract: Shape control of laminated composite plates with integrated piezoelectric actuators is discussed. The effectiveness of piezoelectric actuators and position sensors is investigated for shape control under the influence of quasistatically varying unknown loads. The shape control problem is divided into two parts. 1) For the desired shape function, calculate initial actuator input voltages such that a measure of the mean-squared error between the desired and the achieved shape is minimized. 2) An adaptive feedback algorithm is developed so as to minimize the distortion in the shape introduced by the quasistatically varying loads on the structure. A finite element model based on the shear deformation theory is used to verify the performance of the shape control methodologies.

Flatness-Based Active Vibration Control for Piezoelectric Actuators

Abstract: The accuracy and resolution of metrological devices (coordinate measuring machines -CMM-, interferometers, etc.) are greatly affected by their robustness to external vibrations. This is especially important in the case of micrometric and nanometric microscopes, such as atomic force microscopes (AFM). In such cases, active vibration control strategies are frequently used, requiring actuators capable of fast and accurate responses. Piezoelectric actuators meet these requirements but they suffer from two major drawbacks, hysteresis, and rate dependence, which must be taken into consideration in the design of the control strategy. The present work proposes a novel active vibration control strategy using piezoelectric actuators for metrological devices affected by low external loads. The control strategy combines a classical sky-hook feedback with a feedforward control. The effect of hysteresis is minimized by compensating the senstivity variations of the actuator in oscillatory movements. For the design of the feedforward law, the present work demonstrates that a stack piezoelectric actuator working as a damper admits a mathematical description fulfilling differential flatness. It also proposes a formulation of the active vibration damping problem in terms of a trajectory tracking command perfectly fitted to the flatness-based control law. This strategy obtains damping improvements in the entire frequency range of operation without the instability problems derived from high feedback gains.