Piezoceramic Hysteresis Research Articles

Transition Probability Analysis for Piezoceramic Materials

In this paper, transition probability analysis for piezoceramic actuators is presented. Nonlinear constitutive equations and resulting system models quantifying the non-linear and hysteretic field-displacement relations inherent to piezoceramic elements are developed. In the model development, lattice-level energy relations are combined with stochastic homogenization techniques to construct non-linear constitutive relations which accommodate the piezoceramic hysteresis. Simulation results demonstrated the effectiveness of the theoretical model development using transition probability analysis.

Macro-Fiber Composite actuated simply supported thin airfoils

A piezoceramic composite actuator known as Macro-Fiber Composite (MFC) is used foractuation in the design of a variable camber airfoil intended for a ducted fan aircraft. Thestudy focuses on response characterization under aerodynamic loads for circular arc airfoilswith variable pinned boundary conditions. A parametric study of fluid–structureinteraction is employed to find pin locations along the chordwise direction that result inhigh lift generation. Wind tunnel experiments are conducted on a 1.0% thick, 127 mm chordMFC actuated bimorph airfoil that is simply supported at 5% and 50% of the chord.Aerodynamic and structural performance results are presented for a flow rate of15 m s − 1 and a Reynolds number of 127 000. Non-linear effects due to aerodynamicand piezoceramic hysteresis are identified and discussed. A lift coefficientchange of 1.46 is observed, purely due to voltage actuation. A maximum 2DL/D ratio of 17.8 is recorded through voltage excitation.

Novel, Bidirectional, Variable-Camber Airfoil via Macro-Fiber Composite Actuators

This study aims to enable solid-state aerodynamic force generation in high-dynamic-pressure airflow. A novel, high-load-output, bidirectional variable-camber airfoil employing a type of piezoceramic composite actuator known as a Macro-Fiber Composite is presented. The novel airfoil employs two active surfaces and a single four-bar (box) mechanism as the internal structure. The unique choice of boundary conditions allows variable and smooth deformation in both directions from a flat camber line. The paper focuses on actuation modeling and response characterization under aerodynamic loads. A parametric study of aerodynamic response is employed to optimize the kinematic parameters of the airfoil. The concept is fabricated by implementing eight Macro-Fiber Composite 8557-P1-type actuators in a bimorph configuration to construct the active surfaces. The box mechanism generates deflection and camber change as predicted. Wind-tunnel experiments are conducted on a 12.6% maximum thickness, 127 mm chord airfoil. Aerodynamic and structural performance results are presented for a flow rate of 15 m /s and a Reynolds number of 127,000. Nonlinear effects due to aerodynamic and piezoceramic hysteresis are identified and discussed. A lift coefficient change of 1.54 is observed purely due to voltage actuation. Results are compared with conventional, zero-camber NACA and other airfoils. A 72% increase in the lift-curve slope is achieved when compared with a NACA 0009 airfoil.

Piezoceramic Hysteresis in the Adaptive Structural Vibration Control Problem

Structural vibration control via passive electrical shunting and active (hybrid) actuation of a piezoceramic wafer bonded onto the surface of a simply supported beam is investigated with emphasis on modeling and understanding the effect of piezoceramic nonlinearity on system performance. A nonlinear rate-independent hysteresis model, the Ishlinskii hysteresis (IM) model, is experimentally identified for the PZT wafer by itself and then integrated into the coupled dynamic equations of the overall system consisting of the beam and electrically shunted PZT wafer. Experimental studies of the system validate the theoretical model. This model is then used to investigate the impact of PZT hysteresis on its vibration control performance in passive and hybrid scenarios that have been optimized based on a linear system assumption. A multi-term describing function representation of the IM hysteresis model is formulated to aid in computational studies.

Impact of piezoceramic transducer hysteresis in the hybrid structural vibration control problem

Hybrid vibration control via passive electrical shunting and active actuation of a piezoceramic wafer bonded onto the surface of a simply supported beam is investigated theoretically and experimentally with emphasis on modeling and understanding the impact of the piezoceramic hysteresis. A nonlinear rate-independent hysteresis model is experimentally identified for the PZT wafer by itself and then integrated into the coupled dynamic equations of the overall system consisting of the beam and electrically shunted PZT wafer. Experimental studies of the system validate the theoretical model. This model is then used to investigate the impact of PZT hysteresis on its vibration control performance in passive, active, and hybrid scenarios. [Work supported by grants from ONR and NSF.]