Modal Vibration Control for PVDF Coated Plates

Abstract

Since advanced technical systems, such as aircrafts, space structures and automobiles, have to combine high performance with low weight, passive vibration absorbers reach their limits. This is why active control has become more important in structural dynamics with successful applications. Vibration control requires sensors, actuators and a controller. In this paper Polyvinylidene fluoride (PVDF) is used as actuator and sensor material. The PVDF elements are segmented in arrays on the plate. The sensors act as point sensors and the sensor signals are filtered by a modal sensor matrix. The modal displacements and modal velocities are used as input data for the controller and for a so-called Actuator Management System (AMS) as well. A modal actuator matrix transforms the controller output into driving actuator voltages. The AMS switches elements of the modal actuator matrix which results in quasi modal actuator groups. A rectangular aluminum plate has been equipped with PVDF actuators and sensors and experimental tests have been carried out in order to validate the proposed concept.

Finite element analysis of smart functionally graded plates

“…Use of piezoelectric materials as distributed sensors and actuators for developing smart structures is attributed to these two phenomena. The concept of developing smart structures has been extensively employed for the active vibration control of flexible structures during the past decade (Crawley and Luis, 1987;Baz and Poh, 1988;Ray et al, 1993;Baz and Poh, 1996;Stö bener and Gaul, 2000;Dong and Tong, 2001;Ray, 2003;Ray and Reddy, 2004). However, the main drawback of the existing monolithic piezoelectric materials which are being used in smart structures is that the control authority of these materials is very low as their piezoelectric stress/strain co-efficients are of very small magnitudes.…”

Dynamic shape estimation by modal approach using fiber Bragg grating strain sensors

“…Besides these quantitative errors, the estimated displacement fields could be evaluated qualitatively by creating displacement plots of the real and estimated fields (Figs. 8,9). Figure 5 represents the quantitative estimation errors (RMS) for the investigated sensor placements (Fig.…”

Smart structure dynamics

“…Modal feedback control has been successfully implemented for the reduction of plate vibrations [82]. The modal parameters for plates can be determined using analytical solutions to the governing plate equation or by using FE calculations.…”