Energy-Based Comparison of Solid-State Induced-Strain Actuators

Giurgiutiu, Victor; Rogers, Craig A.; Chaudhry, Zaffir

doi:10.1177/1045389x9600700101

Cited by 68 publications

(60 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Using the measured free-strains and our calculated reduced stiffnesses, the peak volumetric work energy density of each device may be estimated using the following relation (Giurgiutiu, et al, 1996):…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Anisotropic Laminar Piezocomposite Actuator Incorporating Machined PMN–PT Single-crystal Fibers

Wilkie

Inman²,

Lloyd

et al. 2006

Journal of Intelligent Material Systems and Structures

View full text Add to dashboard Cite

The design, fabrication, and testing of a flexible, laminar, anisotropic piezoelectric composite actuator utilizing machined PMN-32%PT single crystal fibers is presented. The device consists of a layer of rectangular single crystal piezoelectric fibers in an epoxy matrix, packaged between interdigitated electrode polyimide films. Quasistatic freestrain measurements of the single crystal device are compared with measurements from geometrically identical specimens incorporating polycrystalline PZT-5A and PZT-5H piezoceramic fibers. Free-strain actuation of the single crystal actuator at low bipolar electric fields (± 250 V/mm) is approximately 400% greater than that of the https://ntrs.nasa.gov/search

show abstract

Section: Mechanical Propertiesmentioning

confidence: 99%

Anisotropic Laminar Piezocomposite Actuator Incorporating Machined PMN–PT Single-crystal Fibers

Wilkie

Inman²,

Lloyd

et al. 2006

Journal of Intelligent Material Systems and Structures

View full text Add to dashboard Cite

show abstract

“…In order to estimate the energy requirements for such modulation we provide a simplified description of the spring actuator [24], as presented in Fig. 6.…”

Section: Energy Evaluation Criteriamentioning

confidence: 99%

Reconfiguring smart structures using approximate heteroclinic connections

Zhang

McInnes

2015

Smart Mater. Struct.

View full text Add to dashboard Cite

Abstract.A new method is investigated to reconfigure smart structures by the technique of polynomial series, used to approximate a true heteroclinic connection between unstable equilibria in a smart structure model. We explore the use of polynomials of varying order to firstly approximate the heteroclinic connection between two equalenergy unstable equilibrium points, and then develop an inverse method to control the dynamics of the system to track the reference polynomial trajectory. It is found that high order polynomials can provide a good approximation to heteroclinic connections and provide an efficient means of generating such trajectories. The method is used firstly in a simple smart structure model to illustrate the method and is then extended to a more complex model where the numerical generation of true heteroclinic connections is difficult. It is envisaged that being computationally efficient, the method could form the basis for real-time reconfiguration of smart structures using heteroclinic connections between equal-energy, unstable configurations.

show abstract

“…By definition "free stroke" is the actuator displacement under zero external load 11 . Measurements of "free stroke" actuators are the most elementary of the characteristics of an actuator.…”

Section: Displacement Measurementsmentioning

confidence: 99%

Evaluation criteria for THUNDER actuators

et al. 1999

View full text Add to dashboard Cite

THUNDER™ (thin-layer composite unimorph ferroelectric driver and sensor) represents a new class of piezoceramicbased actuators capable of generating significant displacements and forces in response to input voltages. The performance capabilities of THUNDER™ actuators are due to the component materials and process used in their construction. A typical THUNDER™ actuator is composed of metallic backing materials (e.g., aluminum or stainless steel), a piezoceramic wafer, and adhesive in spray or film form. The materials are bonded under high pressures and temperatures and then cooled to room temperature after the adhesive has solidified. Due to the prestresses which result from the differing thermal properties of the component materials under cooling, the actuator is highly durable with respect to mechanical impacts and voltage levels. As a result of this construction, voltages in excess of 800 V can be applied to new actuator models without causing damage. This provides the actuators with significant displacement and force capabilities. In this paper, we discuss the development of evaluation criteria which are suitable for characterizing the actuator capabilities and provide a legitimate methodology for comparing THUNDER™ properties with those of other smart material actuators. For example, the concept of blocked force is often used to quantify the force capabilities of an actuator. However, due to the inherent curvature and mode of operation, standard techniques for measuring blocked forces are inappropriate for THUNDER™ actuators. Furthermore, changing operating conditions, frequency, etc., often make blocked force measurements ambiguous. We will discuss techniques for evaluating THUNDER™ properties in a manner which limits such ambiguities when comparing with other smart materials. We note that the evaluation issues discussed here are germane to a variety of high performance smart material transducers.

show abstract

Energy-Based Comparison of Solid-State Induced-Strain Actuators

Cited by 68 publications

References 0 publications

Anisotropic Laminar Piezocomposite Actuator Incorporating Machined PMN–PT Single-crystal Fibers

Anisotropic Laminar Piezocomposite Actuator Incorporating Machined PMN–PT Single-crystal Fibers

Reconfiguring smart structures using approximate heteroclinic connections

Evaluation criteria for THUNDER actuators

Contact Info

Product

Resources

About