Calculation of quasi-static electromechanical coupling coefficients for electrostrictive ceramic materials

Hom, Craig L.; Pilgrim, S.M.; Shankar, Nachiket; Bridger, K.; Massuda, M.; Winzer, S. R.

doi:10.1109/58.294116

Cited by 60 publications

(25 citation statements)

References 11 publications

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“…Hom et al [2] also computed the quasi-static coupling coefficients for an electrostrictive actuator with a DC bias voltage. Their computations assumed that coupling coefficient measured the amount of mechanical work available from the AC power source.…”

Section: B Relations Between Coupling Coefficients and Vibrator Respmentioning

confidence: 99%

“…The displacement output signal for this case does not consist of a single harmonic, but a packet of harmonics which are frequency multiples of the excitation frequency. Table I shows values of β and the relevant model parameters for relaxor-ferroelectrics tested by Hom et al [2] and Brown et al [7]. The chemical formulas for the compositions designated b250077, b300100, and b200120 1 are, respectively:…”

Section: Nondimensional Descriptionmentioning

confidence: 99%

“…Electromechanical coupling coefficients for electrostrictive materials have been derived by Hom et al [2]. For the case without DC bias voltage or prestress, the longitudinal coupling coefficient is given by:…”

Section: B Relations Between Coupling Coefficients and Vibrator Respmentioning

confidence: 99%

“…The Hom and Shankar electrostrictive constitutive law [1], [2] is used to describe the actuator's material behavior. Because the rod is slender, the only non-zero stress component is the direct component aligned along the rod's axis.…”

Section: A Constitutive Behaviormentioning

confidence: 99%

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A dynamics model for nonlinear electrostrictive actuators

Hom

Shankar

1998

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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This paper examines the nonlinear vibration of an electrostrictive ceramic rod actuator excited by a harmonic voltage source. A frequency-domain model was developed using the nonlinear constitutive law for electrostriction. The results predict harmonic distortion of the device's displacement due to the ceramic's nonlinear behavior. AC voltage signal and DC voltage bias were studied to determine the optimum power source parameters for minimizing distortion. The calculations show that the rod's resonance frequency and amplitude depend on the electromechanical coupling strength and differ greatly for large AC voltages from the equivalent linear piezoelectric results. The nonlinear analysis relates the device's electromechanical coupling coefficient to the computed resonance and antiresonance frequencies. This important result could provide the basis for future measurement of the electrostrictive coupling coefficient using resonance techniques.

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Section: B Relations Between Coupling Coefficients and Vibrator Respmentioning

confidence: 99%

Section: Nondimensional Descriptionmentioning

confidence: 99%

Section: B Relations Between Coupling Coefficients and Vibrator Respmentioning

confidence: 99%

Section: A Constitutive Behaviormentioning

confidence: 99%

See 2 more Smart Citations

A dynamics model for nonlinear electrostrictive actuators

Hom

Shankar

1998

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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“…• C. It has a high dielectric constant with a wide temperature range. Materials with a PMN base and operating above the nominal transition temperature will typically have high induced strains (>0.1%) and low hysteresis (<5%) in fields of moderate intensity (∼1 MV/m) [69]. Electrostrictive PMN is a purely nonpiezoelectric material in which the electrostrictive effect can be strongly distinguished.…”

Section: Electrostrictive Materialsmentioning

confidence: 99%

Smart Materials, Precision Sensors/Actuators, Smart Structures, and Structronic Systems

Tzou

Lee

Arnold

2004

Mechanics of Advanced Materials and Structures

176

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Many electroactive functional materials have been used in small-and microscale transducers and precision mechatronic control systems for years. It was not until the mid-1980s that scientists started integrating electroactive materials with large-scale structures as in situ sensors and/or actuators, thus introducing the concept of smart materials, smart structures, and structronic systems. This paper provides an overview of present smart materials and their sensor/actuator/structure applications. Fundamental multifield optomagnetopiezoelectric-thermoelastic behaviors and novel transducer technologies applied to complex multifield problems involving elastic, electric, temperature, magnetic, light, and other interactions are emphasized. Material histories, characteristics, material varieties, limitations, sensor/actuator/structure applications, and so forth of piezoelectrics, shape-memory materials, electro-and magnetostrictive materials, electro-and magnetorheological fluids, polyelectrolyte gels, superconductors, pyroelectrics, photostrictive materials, photoferroelectrics, magneto-optical materials, and so forth are thoroughly reviewed. INTRODUCTIONThe concepts of smart, intelligent, and adaptive materials and structures originated in the mid-1980s in an attempt to describe the newly emerging research area of integrating electroactive functional materials into large-scale structures as in situ sensors and actuators. Previously, electroactive materials had only been used in small-and microscale transducers and precision mechatronic (mechanical + electronic) control systems. The general perception of smart, intelligent, and adaptive materials or structures implies an ability to be clever, sharp, active, fashionable, and sophisticated. However, in reality, materials or structures can never achieve true intelligence or reasoning without the addition of artificial intelligence

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