27 July 1998 Piezoelectric actuators for dynamic applications
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Abstract
The main advantages of piezoelectrical actuators are their high resolution in motion and their excellent dynamic behavior. Especially the very short response times of solid state actuators presents new opportunities in developing high dynamical systems with unsurpassable characteristics. New concepts of piezoelectrically driven microoptical devices, e.g. optical fiber switches, intensity modulators and choppers, can be developed. Very compact systems with parallel motion and high accuracy can be realized by the integration of piezoelectrical actuators into special mechanical frames with solid state hinges. Due to the combination of piezoelectrical actuators and mechanical lever transmission systems decisive advantages compared with other actuation concepts can be obtained. Appropriate displacements can be reached with comparatively small sized and thus low capacitance actuators. Low capacitance actuators enable the use of efficient electrical amplifiers for high dynamics. The behavior of the mechanical system is equivalent to a spring-mass-oscillator with a high quality factor. Because of their high stiffness the resonance frequencies of piezoelectrical actuators are quite high, but parasitic oscillations can appear if the element is driven with unsteady electrical functions e.g. square- or triangle- functions. Unwanted oscillations can deteriorate the general characteristics of dynamic actuators or in worst cases they can cause mechanical break down. New hybrid piezoelectrical actuator systems for dynamical applications are presented. General aspects of improving the dynamics of piezoelectrical systems and different methods for adequate passive damping will be discussed in this paper.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Peter Buecker, Bernt Goetz, Thomas Martin, "Piezoelectric actuators for dynamic applications", Proc. SPIE 3329, Smart Structures and Materials 1998: Smart Structures and Integrated Systems, (27 July 1998); doi: 10.1117/12.316924; https://doi.org/10.1117/12.316924
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KEYWORDS
Actuators

Ceramics

Capacitance

Resistance

Control systems

Modulators

Optical fibers

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