Abstract
The development of lightweight, stronger, and more flexible structures has received the utmost interest from many researchers. For this reason, piezoelectric materials, with their inherent electromechanical coupling, have been widely incorporated in the development of such structures to attenuate their vibrations. However, one of the main challenges is to find the optimal control and sensor-actuator placement. This paper presents an active vibration control for flexible structures, whereby a simply supported plate is taken as the benchmark model. A feedback controller with a collocated sensor-actuator configuration is used. Both disturbance and control signal acting on the plate is created by using piezoelectric (PZT) patches. The analytical model is derived based on the Euler-Bernoulli model. The Optimal location of the collocated sensor-actuator, as well as PID controller gains, are determined using Ant Colony Optimization (ACO) technique, then compared with the Genetic Algorithm (GA) and enumerative method (EM). Optimization in this paper is based on minimizing frequency average energy. The optimal performance value of piezoelectric patch sensor-actuator position and PID controller gains are verified experimentally. It was found that PID controller gains and collocated sensor-actuator location optimizations using ACO, GA and enumerative methods give similar results, which implies the effectiveness of ACO as an optimization technique. More than 20 % of attenuation achieved using the available hardware setup.
Highlights
Lighter, stronger and more flexible structures are said to be the ideal forms of structures in vibration suppression with minimum power consumption [1]
This paper presents theoretical and experimental works on active vibration control (AVC) strategy on a supported thin plate using a piezoelectric patch for modal overlap factor (MOF) less than 1
Vibration excitation and suppression are generated by 2 MIDE piezoelectric patches and each is connected to ACX power amplifier model EL-1225 with 20-time amplification factor
Summary
Stronger and more flexible structures are said to be the ideal forms of structures in vibration suppression with minimum power consumption [1]. The development of lightweight yet stronger structures that can withstand vibrational loads has gained the utmost attention by researchers. Such structures can be developed when piezoelectric patches (sensor-actuator) are integrated with an optimized active vibration control (AVC) strategy [2]. Piezoelectric actuators have shown significant benefits in vibration control due to their ability to excite only the structures' elastic modes without exciting the rigid body modes. It is crucial since it is often required to control the structures' elastic motions [3]
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