Decentralised active control of single ‐ frequency panel vibrations using piezoelectric actuator ‐ sensor pairs

2008 ◽  
Vol 123 (5) ◽  
pp. 3573-3573
Author(s):  
Alain Berry ◽  
Philippe Micheau ◽  
Rémi Louviot ◽  
Yvonnick Brunet
Keyword(s):  
Active Control ◽  
Piezoelectric Actuator ◽  
Single Frequency

Active Performance Optimization of Cantilever Piezoelectric Energy Harvester

2014 ◽  
Author(s):  
M. Tavakkoli Anbarani ◽  
A. Alasty
Keyword(s):  
Resonance Frequency ◽  
Active Control ◽  
Piezoelectric Actuator ◽  
Performance Optimization ◽  
Energy Harvester ◽  
Distributed Parameter ◽  
Piezoelectric Energy ◽  
Significant Performance ◽  
Beam Type ◽  
Working Frequency

A Piezoelectric Energy Harvester (PEH) of cantilever beam type is developed to optimize the generated power by means of active control of moment of inertia of the beam. Distributed parameter equations of vibration of the beam are developed. Then the electromechanical response of the piezoelectric actuator is discussed. The harvester configuration is then described and it is shown that such a configuration can avoid the drastic power drop in presence of uncertainty around resonance frequency by applying voltage to the piezoelectric actuator. Finally the proposed harvester output power working frequency span is compared to conventional methods to show that the significant performance optimization in proposed method is achieved.

Active Control of Elastodynamic Vibrations of a Flexible Mechanism With Piezoelectric Actuator

1999 ◽  
Author(s):  
Ching-I Chen
Keyword(s):  
Control Theory ◽  
Active Control ◽  
Piezoelectric Actuator ◽  
Control Strategies ◽  
Piezoelectric Actuators ◽  
Structural Vibration ◽  
Control Technique ◽  
Vibration Modes ◽  
Time Sharing ◽  
Transient Dynamic

Abstract This study focused on the application of active vibration control strategies for flexible moving structures which degrade into transient dynamic vibration problem. These control strategies are based primarily on modal control methods in which the flexible moving structures are controlled by reducing their dominant vibration modes. This work numerically investigated active control of the elastodynamic response of a four-bar mechanical system, using a piezoelectric actuator. A controller based on the modified independent modal space control theory was also utilized. This control theory produced overall excellent performance in terms of achieving the desired closed-loop structural damping. The merits of this technique include its ability to manage the spill-over effect, i.e. eliminate the magnitude of vibrations associated with uncontrolled modes, using only a few selected modes for control. This control was accomplished using a time sharing technique, which reduces the number of piezoelectric actuators required to control a large number of vibration modes. Furthermore, this algorithm implements a procedure for determining the optimal locations for the piezoelectric actuators. The dynamics of a steel four-bar linkage was selected with a flexible coupler separated by six elements and one piezoelectric actuator was used in the numerical simulation. The optimal actuator position was located at the third element from the right to the left. Results in this study demonstrated that a highly desired the structural vibration damping could be achieved. This control technique can be applied to transient dynamic systems.

Active Control of a Beam for Generating Points of Zero Displacements and Zero Slopes

2009 ◽  
Vol 147-149 ◽  
pp. 861-868 ◽  
Author(s):  
Qibo Mao ◽  
Stanislaw Pietrzko
Keyword(s):  
Boundary Condition ◽  
Control System ◽  
Control Systems ◽  
Active Control ◽  
Piezoelectric Actuator ◽  
Excitation Frequency ◽  
Piezoelectric Sensor ◽  
Mode Shapes ◽  
Single Input Single Output ◽  
Resonance Frequencies

Piezoelectric transducers have been used extensively as the distributed actuators and sensors in active control of structural vibrations. Piezoelectric actuator/sensors are distributively bonded on or embedded in the host structure and have the inherent advantage of integrating over their surface area, which leads to potentially more robust implementations as compared to implementations that use shaker/accelerometers. For this reason piezoelectric actuator/sensors have attracted more and more attention in recent years. In this paper, a theoretical analysis is presented of the active control of a vibrating beam using collocated triangular and rectangular piezoelectric actuator/sensor pairs. The aim of this study is to generate points of zero displacements and zero slopes at any designated position. So the control systems impose a virtual clamped boundary condition at the control position on the beam, in which both displacement and slope are driven to zero. Two independent single-input single-output (SISO) control systems similar to direct velocity feedback (DVFB) are implemented, i.e. for the rectangular pair the voltage signal measured by a triangular piezoelectric sensor is electronically multiplied by a fixed gain and fed directly back to a collocated piezoelectric actuator. The triangular and rectangular piezoelectric actuator/ sensor pairs positioned at one end of the beam are used to measure and control the displacement and slope of the structure respectively. The active control systems are unconditionally stable for any type of primary disturbance acting on the structure due to the collocated actuator/sensors. It should be noted that the presented control strategy is different to DVFB. In DVFB, when the control gain is increased, the vibration energy of the beam is initially reduced at resonance frequencies because of the active damping effect. However this effect does not continue. When large control gains are implemented, the overall kinetic energy of the beam is increased to the same or even higher values than those of the beam without control systems because the vibration of the beam is rearranged into a new set of lightly damped resonance frequencies. Imposing a virtual clamped boundary condition at the control position is clearly more complicated than DVFB, because in addition to the zero displacement constraints, the zero slope constraints must also be satisfied. The proposed control system allows for certain points of the structure to remain stationary without using any rigid supports. Furthermore, such control systems have the potential to create a region of nearly zero vibration for any ‘excitation’ frequency. This means that no progressive waves or reflected waves exist in the designated region, thus significantly reducing the vibration level in that region of the beam. The control systems impose a virtual clamped boundary condition at the control position on the beam in which the displacement and slope are driven to zero. As a result, the vibration of the actively controlled beam can be described in terms of two beams clamped at the control position. A numerical analysis is then performed to verify the proposed control system. It is found that the new resonance frequencies and mode shapes seen in the simulations are consistent with the natural frequencies and natural modes of the controlled beam derived analytically. The capability of the proposed method for generating a zero-vibration region is also numerically demonstrated.

Step consistency active control method for inertial piezoelectric actuator using embedded strain gauges

2021 ◽  
Vol 92 (12) ◽  
pp. 125005
Author(s):  
Jianfei Cheng ◽  
Jie Deng ◽  
Yingxiang Liu ◽  
Shijing Zhang ◽  
Fei Lu ◽  
...  
Keyword(s):  
Active Control ◽  
Piezoelectric Actuator ◽  
Control Method ◽  
Strain Gauges ◽  
Active Control Method
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