Piezoelectric actuation mechanisms for intelligent sandwich structures

Surface-mounted piezoelectric materials poled in the same direction as the applied electric field are known to induce membrane strains only. This could be seen as their conventional extension actuation mechanism. However, when piezoelectric materials are constrained and poled perpendicularly to the applied electric field, they act through their shear modes. This is the newly defined shear actuation mechanism. The present paper compares both mechanisms with the help of an adaptive sandwich beam finite element, with either active surface layers (for the extension mechanism) or active core (for the shear mechanism). Segmented configurations are studied for cantilever beams. Deflection, stress and vibration characteristics are compared for various parameters (structure/actuator stiffness and thickness ratios, actuator position and length). The shear actuation mechanism is found to present several promising features for brittle piezoceramics' use. In particular, it was found that the shear actuation mechanism is more efficient than the extension mechanism for stiff structures and thick piezoelectric actuators.

[1]  Geoffrey R. Tomlinson.  Overview of active/passive damping techniques employing viscoelastic materials , 1996, Other Conferences.

[2]  Craig A. Rogers,et al.  Application of Commercial Finite Element Codes for the Analysis of Induced Strain-Actuated Structures , 1994 .

[3]  Young-Hun Lim,et al.  Closed loop finite-element modeling of active/passive damping in structural vibration control , 1996 .

[4]  Nesbitt W. Hagood,et al.  Improving transverse actuation of piezoceramics using interdigitated surface electrodes , 1993, Smart Structures.

[5]  Ayech Benjeddou,et al.  Advances in Hybrid Active-Passive Vibration and Noise Control Via Piezoelectric and Viscoelastic Constrained Layer Treatments , 2001 .

[6]  Grant P. Steven,et al.  A Review on the Modelling of Piezoelectric Sensors and Actuators Incorporated in Intelligent Structures , 1998 .

[7]  Ayech Benjeddou,et al.  Vibrations of complex shells of revolution using B-spline finite elements , 2000 .

[8]  Singiresu S Rao,et al.  Recent Advances in Sensing and Control of Flexible Structures Via Piezoelectric Materials Technology , 1999 .

[9]  Roger Ohayon,et al.  A Unified Beam Finite Element Model for Extension and Shear Piezoelectric Actuation Mechanisms , 1997 .

[10]  Roger Ohayon,et al.  Parametric Analysis of the Vibration Control of Sandwich Beams Through Shear-Based Piezoelectric Actuation , 1999 .

[11]  Chulho Kim,et al.  Composite Piezoelectric Assemblies for Torsional Actuators , 1997 .

[12]  C. Sun,et al.  Use of thickness-shear mode in adaptive sandwich structures , 1995 .

[13]  Roger Ohayon,et al.  New Shear Actuated Smart Structure Beam Finite Element , 1999 .

[14]  M. A. Trindade,et al.  Modeling of Frequency-Dependent Viscoelastic Materials for Active-Passive Vibration Damping , 2000 .

[15]  Ayech Benjeddou,et al.  Advances in piezoelectric finite element modeling of adaptive structural elements: a survey , 2000 .

[16]  C. Sun,et al.  Formulation of an adaptive sandwich beam , 1996 .

[17]  Daniel J. Inman,et al.  Some design considerations for active and passive constrained layer damping treatments , 1996 .

[18]  Amr M. Baz,et al.  Boundary Control of Beams Using Active Constrained Layer Damping , 1997 .

[19]  E. Crawley,et al.  Detailed Models of Piezoceramic Actuation of Beams , 1989 .