Active vibration control structures using piezoelectric materials: A review (original) (raw)
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Design and Analysis of Smart Structures for Active Vibration Control using Piezo-Crystals
International Journal of …, 2011
The present work considers the active vibration control of beam like structures with laminated piezoelectric sensor and actuator layers bonded on top and bottom surfaces of the beam. A finite element model based on Euler-Bernoulli beam theory has been developed. The contribution of the piezoelectric sensor and actuator layers on the mass and stiffness of the beam has been considered with modeling of entire structure in a state space form. The designing of state/output feedback control by Pole placement technique and LQR optimal control approach are demonstrated to achieve the desired control. From the analysis, it has been observed that the LQR control scheme is very effective in controlling the vibration. Numerical simulation shows that including and varying the location of the sensor / actuator mass and stiffness from the free end to the fixed end on the beam produces a considerable change in the system's structural vibration characteristics. The study illustrates that sufficient vibration suppression can be attained by means of the proposed methods.
Smart Materials and Structures, 1997
In order to reduce the vibrational level of lightweight composite structures, active vibration control methods have been applied both numerically and experimentally. Using the classical laminated beam theory and Ritz method, an analytical model of the laminated composite beam with piezoelectric sensors and actuators has been developed. Smart composite beams and plates with surface-bonded piezoelectric sensors and actuators were manufactured and tested. It is found that the developed analytical model predicts the dynamic characteristics of smart composite plates very well. Utilizing a linear quadratic Gaussian (LQG) control algorithm as well as well known classical control methods, a feedback control system was designed and implemented. A personal computer (PC) was used as a controller with an analogue-digital conversion card. For a cantilevered beam the first and second bending modes are successfully controlled, and for cantilevered plates the simultaneous control of the bending and twisting modes gives a significant reduction in the vibration level. LQG has shown advantages in robustness to noise and control efficiency compared with classical control methods. In this study examples of control spillover are demonstrated via the instantaneous power spectrum of the sensor output.
Active vibration control of smart structures using piezoelements
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Active Vibration Control of Rectangular Plate with Piezoceramic Elements
Archives of Acoustics, 2008
This paper represents the possibilities of reducing mechanical vibration of plates by active vibration control through piezoceramic elements placed on the plane. In the preliminary research a rectangular plate made of aluminium was analyzed. Sound insulation and vibrations measurement were executed on a specialized enclosure in reverberation chamber. A PZT piezoceramic was proposed to control vibrations of the plate. Piezoelements were located in four points on the plate, which have maximum amplitude for (2,2) mode. Vibrations and transmitted sound before and after control is compared using sound and vibration analyser. The results show that after control, vibrations are reduced 10 dB
Highly Efficient Piezoelectric Actuators for Active Vibration Control
MRS Proceedings, 2003
ABSTRACTAn high performance / inexpensive diskbender actuator was produced by combining efficient design and fabrication methods and a new technique to operate these actuators was developed and tested, which can enhance the displacement and force capabilities by almost a factor of 2 by using the same maximal driving voltage.The properties of these actuators are intermediate between those of standard bimorphs, used for very large displacements but providing rather small forces, and those of low voltage stack multilayers, which provide quite large forces but are generally heavier, larger and expensive for equivalent displacements. The absence of any external mechanical amplification mechanism and their geometry make these actuators particularly suitable for active vibration damping applications within buildings affected by perturbations of hundreds of μm or for noise control by emission of controlled sound in antiphase. The class of displacement/force, which can be obtained with suita...
According to a popular definition, piezoelectricity denotes two physical effects that exist in certain materials, namely "the generation of electric charge in a substance by a mechanical stress that changes its shape, and a proportional change in the shape of a substance when voltage is applied. Piezoceramics are kind of piezoelectric materials that are available in various forms such as rigid patch, flexible patch and Piezoceramic friction dampers. Active structural vibration control using piezoelectric Sensors and actuators have recently emerged as a practical and promising technology During the last two decades and there has been an enormous accelerating level of interest in the control of earthquake vibration by the active techniques. This paper first presents basics about Piezoceramic materials, various actuation methods and types of Piezoceramic actuators in comparison to piezoelectric composites as an intelligent damper in constructional usage and then reviews research into the application of Piezoceramic actuators in various civil structures.
2012
This work is aimed at the active vibration control of a flexible structures using piezoelectric material. A simple supported plate structure, which is supported at two opposite ends, is taken as the flexible structure with piezoelectric materials as sensors and actuators. Sensors and actuators, which are square in shapes, are embedded to the parent structure. The active controller was designed to control first three modes of vibration of plate. First, the analysis for the transient vibrations in a simple supported plate structure was performed which was followed by the analysis of the same simple supported plate structure when embedded upon with a pair of sensor and actuator. The plate was discretised into several small rectangular elements (6X6, 7X7… 11X11) of identical size in order to assign the different locations to sensors and actuators, which were assumed to be of the exact shape of the discretized plate elements. Further a LQR controller is applied for attenuating the global structural vibration. Settling time for each different location of piezoelectric patch location was observed which was then followed by an interpretation for the optimal location for piezoelectric patch for maximizing the vibration control. The model designed for study was duly verified with the results from past literature and an agreement between the both was observed.
DEVELOPMENT AND TESTING OF ACTIVE VIBRATION CONTROL SYSTEMS WITH PIEZOELECTRIC ACTUATORS
Active control of vibrations has become a relevant technology for many sectors. For most of the established applications electrodynamic actuators are used so far. Yet, the integration of piezoelectric actuators enables new designs which promise a higher level of integration and compactness. However, the piezoelectric actuators also raise some challenges, since they are sensitive to misuse loads and possess a rather high stiffness. In this paper, three examples for active vibration control systems are introduced. The specific issues regarding the integration of piezoelectric actuators and the solutions implemented are described.