Design of a Single-Crystal Piezoceramic Vibration Absorber

Abstract

The development of a new class of devices for the suppression of structural vibration becomes possible by exploiting the unique properties of single-crystal piezoceramics. These vibration absorbers will be compact, robust, and demand minimal power for operation. They will be characterized by frequency agility, which means that the absorber tuning parameters can adapt rapidly to controller command and tuning can be accomplished over a wide frequency range. Identified applications include control of turbomachinery vibration, flexible space structures, jitter control in optical systems, and vibration isolation in machinery mounts. The current state-of-the-art adaptive vibration absorber tuning range is fundamentally limited by the electromechanical coupling of presently available polycrystalline piezoceramic materials. The narrow tuning range characteristic of current vibration absorbers severely limits the implementation of the solid-state absorber concept. This work presents efforts related to the design of vibration absorbers that use the single-crystal piezoceramic large electromechanical coupling to achieve greatly enhanced tuning over a wide frequency range. Absorber electromechanical coupling-coefficients greater than 50% were obtained. Design issues specifically related to the use of single crystals in vibration absorbers were identified and addressed. Several device configurations were analyzed and tested. Good agreement was observed between analytical and experimental results.

Structural multi-modal damping by optimizing shunted piezoelectric transducers

“…Keeping the same size of material, we have use PMN-33PT material from TRS Technology in comparison with the previously used PZT P1-94 from Saint Gobin Quartz (Cao, Schmidt, Cao, Rui et Luo 2004). The capabilities of PMN-33PT material for absorbing vibration were already proved in (Rusovici, Dosch et Lesieutre 2002). The PMN-33PT is a single crystal material and is a softer piezoelectric element than PZT that explains the lower eigen frequencies observed on the PMN-33PT equipped beam.…”

Structural Vibration Control via R-L Shunted Active Fiber Composites

“…Resonant shunts (Hagood and von Flotow, 1991) build L-C-R circuits with the inherent piezoelectric capacitance, and behave in a similar fashion to mechanical vibration absorbers. Capacitive shunts (Lesieutre, 1998;Davis and Lesieutre, 2000;Rusovici et al, 2002) are often used in tunable mechanical vibration absorbers, because they change the effective stiffness of the piezoelectric element. The inherent piezoelectric capacitance can be neutralized by negative capacitor shunts (Wu, 1998), which achieve efficient broadband vibration suppression performance.…”

Tunable fluidic composite mounts for vibration absorption

“…The spring stiffness of a structure with a piezoelectric patch can be switched from the piezoceramic open-circuit elastic modulus to its short-circuit modulus by shunting through a variable capacitor (Davis et al, 1997). Rusovici et al (2002) design a TVA using a single-crystal piezoceramic that provides a fast response time and variable frequency tuning.…”