Effectiveness of line type and cross type piezoelectric patches on active vibration control of a flexible rectangular plate

Abstract In the present work, vibration control of a simply supported plate with line type and cross type piezoelectric (PZT) patches are investigated with and without actuation voltage. The plate is modeled under the assumption of Kirchhoff’s Plate theory. The mass of PZT patches remain constant in all cases. In case of actuation, applied voltage considered are 1, 2 and 3 mV. The external excitation to the plate is in the form of harmonically varying point load of 1 mN. It is noticed that cross type PZT patch is more effective in deflection suppression of plate than that of line type PZT patch at 3 mV of actuation at patch thickness of 0.75 μm. Suppression of central deflection of plate for line type and cross type PZT patches are obtained in different frequency bands of (175–185 Hz) and (870–880 Hz) respectively.

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Active Vibration Control of Cantilever Beam by Using Optimal LQR Controller

Journal of Engineering ◽

10.31026/j.eng.2018.11.01 ◽

2018 ◽

Vol 24 (11) ◽

pp. 1

Author(s):

Hadeer Abd UL-Qader Mohammed ◽

Hatem Rahem Wasmi

Keyword(s):

Vibration Control ◽

Cantilever Beam ◽

Experimental Work ◽

Active Vibration Control ◽

Actuation Voltage ◽

Smart Structure ◽

Control Gain ◽

Lqr Controller ◽

Smart Beam ◽

Active Vibration

Many of mechanical systems are exposed to undesired vibrations, so designing an active vibration control (AVC) system is important in engineering decisions to reduce this vibration. Smart structure technology is used for vibration reduction. Therefore, the cantilever beam is embedded by a piezoelectric (PZT) as an actuator. The optimal LQR controller is designed that reduce the vibration of the smart beam by using a PZT element. In this study the main part is to change the length of the aluminum cantilever beam, so keep the control gains, the excitation, the actuation voltage, and mechanical properties of the aluminum beam for each length of the smart cantilever beam and observe the behavior and effect of changing the length of the smart cantilever beam. A cantilever beam with piezoelectric is modeled in Mechanical APDL ANSYS version 15.0 and verified this by using experimental work. The AVC was tested on a smart beam under different control gains in experimental work and chose the best control gain depending on FEM results for each length of the smart beam. The response of the smart beam is noticed to be different for every length and the reduction percentage for settling time was different for every length.

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Active vibration control of a shaft bracket-plate coupled system

Proceedings of the Institution of Mechanical Engineers Part M Journal of Engineering for the Maritime Environment ◽

10.1177/14750902211033262 ◽

2021 ◽

pp. 147509022110332

Author(s):

Dequan Yang ◽

Xiling Xie ◽

Mingke Ren ◽

Zhiyi Zhang

Keyword(s):

Vibration Control ◽

Plate Theory ◽

Active Vibration Control ◽

Beam Theory ◽

Experimental System ◽

Coupled System ◽

Plate Vibration ◽

Vibration Absorbers ◽

Thin Plate Theory ◽

Active Vibration

Active vibration control of a shaft bracket-plate coupled system is investigated. The vibration of the plate is controlled with electromagnetic vibration absorbers (EVAs), which are mounted around the feet of the shaft bracket to impede the transmission of vibration from the bracket apex to the plate. A dynamic model is established on the Timoshenko beam theory and the Kirchhoff thin plate theory to reveal the mechanism of vibration transmission. It is exhibited that all the induced forces and moments at the coupling points contribute much to the transverse responses of the plate. The feasibility of active control with the EVAs is evaluated numerically based on the controllability of the plate vibration. It is demonstrated that the two-point in-plane control is able to attenuate the plate vibration under the excitation of in-plane disturbance forces, while the multi-point control is effective in reducing the plate vibration regardless of the directions of disturbance forces. An experimental system is built to verify the performance of the two-point in-plane control. The results have shown that with the help of adaptive control, the two-point in-plane control is capable of suppressing the vibration of the foundation induced by the in-plane forces acting on the shaft bracket.

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Numerical analysis based on finite element method of active vibration control of a sandwich plate using piezoelectric patches

Mechanics and Mechanical Engineering ◽

10.2478/mme-2020-0005 ◽

2020 ◽

Vol 24 (1) ◽

pp. 7-16

Author(s):

Hanane Serhane ◽

Kouider Bendine ◽

Farouk Benallel Boukhoulda ◽

Abdelkader Lousdad

Keyword(s):

Finite Element ◽

Vibration Control ◽

Sandwich Plate ◽

Plate Theory ◽

Active Vibration Control ◽

Piezoelectric Sensor ◽

Element Model ◽

Classical Plate Theory ◽

Smart Sandwich Plate ◽

Active Vibration

AbstractAn active method of vibration control of a smart sandwich plate (SSP) using discrete piezoelectric patches is investigated. In order to actively control the SSP vibration, the plate is equipped with three piezoelectric patches that act as actuators. Based on the classical plate theory, a finite element model with the contributions of piezoelectric sensor and actuator patches on the mass and stiffness of the sandwich plate was developed to derive the state space equation. LQR control algorithm is used in order to actively control the SSP vibration. The accuracy of the present model is tested in transient and harmonic loads. The applied piezoelectric actuator provides a damping effect on the SSP vibration. The amplitudes of vibrations and the damping time were significantly reduced when the control is ON.

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