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Electromagnetic and Piezoelectric Transducers

  • A. Preumont
Part of the Solid Mechanics and Its Applications book series (SMIA, volume 179)

Introduction

Transducers are critical in active structures technology; they can play the role of actuator, sensor, or simply energy converter, depending on the applications. In many applications, the actuators are the most critical part of the system; however, the sensors become very important in precision engineering where sub-micron amplitudes must be detected.

Two broad categories of actuators can be distinguished: “grounded” and “structure borne” actuators. The former react on a fixed support; they include torque motors, force motors (electrodynamic shakers) or tendons. The second category, also called “space realizable”, include jets, reaction wheels, control moment gyros, proof-mass actuators, active members (capable of both structural functions and generating active control forces), piezo strips, etc... Active members and all actuating devices involving only internal, self-equilibrating forces, cannot influence the rigid body motion of a structure.

This chapter begins with a description of the voice-coil transducer and its application to the proof-mass actuator and the geophone (absolute velocity sensor). Follows a brief discussion of the single axis gyrostabilizer. The remaining of the chapter is devoted to the piezoelectric materials and the constitutive equations of a discrete piezoelectric transducer. Integrating piezoelectric elements in beams, plates and trusses will be considered in the following chapter.

Keywords

Constitutive Equation Piezoelectric Material Piezoelectric Transducer Electromechanical Coupling Factor Reaction Wheel 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2011

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  • A. Preumont

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