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- W1520375780 abstract "Vibration in modern structures like airplanes, satellites or cars can cause malfunctions, fatigue damages or radiate unwanted and loud noise (Simpson & Schweiger, 1998; Wu et al., 2000; Hopkins et al., 2000; Kim et al., 1999; Zhang et al., 2001; Hagood et al., 1990). Since conventional passive damping materials have reached their limits to damp vibration because it is not very effective at low frequencies and requires more space and weight, new control designs with novel actuator systems have been proposed. These so called smart materials can control and suppress vibration in an efficient and intelligent way without causing much additional weight or cost. The vast majority of research in smart damping materials has concentrated on the control of structures made from composite materials with embedded or bonded piezoelectric transducers because of their excellent mechanicalelectrical coupling characteristics. A piezoelectric material responds to mechanical force by generating an electric charge or voltage. This phenomenon is called the direct piezoelectric effect. On the other hand, when an electric field is applied to the material mechanical stress or strain is induced; this phenomenon is called the converse piezoelectric effect. The direct effect is used for sensing and the converse effect for actuation. The methods of vibration control using piezoelectric transducers can be mainly divided into three categories: passive, active, and semi-active. Passive control systems, which use the R-L shunting (Hagood & Crawley, 1991; Hollkamp, 1994), are simplest among the three categories, but their control performance is sensitive to the variations of the system parameters. Moreover, the passive control systems usually need large inductance in low frequency domain, which is difficult to realize. Active control systems require high-performance digital signal processors and bulky power amplifiers to drive actuators, which are not suitable for many practical applications. In order to overcome these disadvantages, several semi-active approaches have been proposed. Wang et al. (1996) studied a semi-active R-L shunting approach, in which an adaptive inductor tuning, a negative resistance and a coupling enhancement set-up lead to a system with damping ability. Davis et al. (1997, 1998) developed a tunable electrically shunted piezoceramic vibration absorber, in which a passive capacitive shunt circuit is used to electrically change the piezoceramic effective stiffness and then to tune the device response frequency. Clark, W. W. (1999) proposed a state-switched method, in which piezoelements are periodically held in the open-circuit state, then switched and held in the short-circuit state, synchronously with the structure motion. Source: Vibration Control, Book edited by: Dr. Mickael Lallart, ISBN 978-953-307-117-6, pp. 380, September 2010, Sciyo, Croatia, downloaded from SCIYO.COM" @default.
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- W1520375780 date "2010-08-18" @default.
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- W1520375780 title "Semi-Active Vibration Control Based on Switched Piezoelectric Transducers" @default.
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- W1520375780 doi "https://doi.org/10.5772/10146" @default.
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