Optimal Tracking Using Magnetostrictive Actuators Operating in Nonlinear and Hysteretic Regimes

Oates, William S.; Smith, Ralph C.

doi:10.1115/1.3072093

Cited by 10 publications

(2 citation statements)

References 34 publications

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“…Whereas the hydraulic amplification increases displacement, it also amplifies the ferroelectric hysteresis previously shown in Figure 6. However, various control designs such as nonlinear optimal control can be implemented to mitigate this effect [25,26]. Furthermore, single crystal ferroelectric relaxor stack actuators, which exhibit smaller hysteresis under uni-polar fields [27], may also improve open loop performance by reducing the minor loop hysteresis.…”

Section: Discussionmentioning

confidence: 99%

Piezohydraulic Actuator Development for Microjet Flow Control

Oates

Liu

2009

Journal of Mechanical Design

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This paper describes the development of a piezohydraulic actuator for broadband microjet flow control applications. The actuator utilizes a lead zirconate titanate (PZT) stack actuator and a hydraulic amplification design to achieve relatively large displacements in a compact actuator to control flow through a microjet orifice. Displacement amplification of 81 times the stack actuator displacement was achieved using a new dual-diaphragm design. The nonlinear and hysteretic field-coupled material behavior, structural dynamics, and fluid dynamics of the actuator are modeled using a system dynamic model and compared with experimental results. The nonlinear and hysteretic piezohydraulic actuator characteristics are shown to be strongly dependent on the nonlinear deformation of the rubber diaphragm and minor loop hysteresis of the PZT stack actuator. The modeling technique provides a design tool for broadband performance predictions and system optimization to facilitate implementation of the actuator in a flow environment.

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Section: Discussionmentioning

confidence: 99%

Piezohydraulic Actuator Development for Microjet Flow Control

Oates

Liu

2009

Journal of Mechanical Design

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“…For the ferroelectric material, PZT5H was used and chosen to have negligible thermal relaxation. The HEM model parameters that are representative of these materials are shown in table 1, see [23] for PZT5H and [18] for Terfenol-D. The curves represented by these parameters are compiled in figure 1.…”

Section: Simulation Resultsmentioning

confidence: 99%

Quantification of hysteresis and nonlinear effects on the frequency response of ferroelectric and ferromagnetic materials

Stuebner

Atulasimha

Smith

2009

Smart Mater. Struct.

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Abstract. Ferroelectric (e.g., PZT and PMN) and ferromaqnetic (e.g., Terfenol-D) materials exhibit high energy densities, broadband drive capabilities, and the capacity for both actuating and sensing. This makes them attractive as compact transducers for applications including nanopositioning systems such as atomic force microscopes (AFM), acoustic transducers, and drive mechanisms for high speed milling. However, these materials also exhibit hysteresis and constitutive nonlinearities at all drive levels. To achieve stringent tracking requirements, it is critical to understand and quantify the effect of hysteresis and nonlinearities on the frequency behavior of devices that employ these compounds. Whereas considerable progress has been made on model development and understanding these materials in the parameter space and time domain, comprehensive quantification of these effects in the frequency domain is presently lacking. In this paper, we investigate both numerically and experimentally the effect of hystersis, constitutive nonlinearities, bias fields and AC drive levels on the frequency domain behavior of ferroelectric and ferromagnetic materials.

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