The dynamic properties of tubular DEAP actuators

Tryson, Michael J.; Sarban, Rahimullah; Lorenzen, Kim P.

doi:10.1117/12.847297

Cited by 9 publications

(7 citation statements)

References 14 publications

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“…Note that parameter tolerances easily can reach 10 %. Especially the estimated moving or active mass is a rough estimate, assuming that half of the DEAP mass is moving [13]. Finite element analysis can be used to determine the actual moving mass, but this is beyond the scope of this paper.…”

Section: Resultsmentioning

confidence: 99%

Characterization of dielectric electroactive polymer transducers

et al. 2014

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This paper analysis the small-signal model of the Dielectric Electro Active Polymer (DEAP) transducer. The DEAP transducer have been proposed as an alternative to the electrodynamic transducer in sound reproduction systems. In order to understand how the DEAP transducer works, and provide guidelines for design optimization, accurate characterization of the transducer must be established. The small signal model of the DEAP transducer is derived and verified. Impedance measurements are shown for a push-pull DEAP based loudspeaker, and the dependency of the biasing voltage is explained. A measuring setup is proposed, which allows the impedance to be measured, while the DEAP transducer is connected to its biasing source.

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Section: Resultsmentioning

confidence: 99%

Characterization of dielectric electroactive polymer transducers

et al. 2014

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“…After being actively involved in the field of DE [111,112], Danfoss shut down its production of their DE solution called InLastor which could achieve an elevated blocking force of 16N, a relative strain of 2-3% and with rather low operating frequency (<100 Hz).…”

Section: Available Commercial Flexible Materials Suited To Design Mre Actuatorsmentioning

confidence: 99%

Actuators for MRE: New Perspectives With Flexible Electroactive Materials

et al. 2021

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Since 1995, Magnetic Resonance Elastography (MRE) has been constantly developed as a non-invasive diagnostic tool for quantitative mapping of mechanical properties of biological tissues. Indeed, mechanical properties of tissues vary over five orders of magnitude (the shear stiffness is ranging from 102 Pa for fat to 107 Pa for bones). Additionally, these properties depend on the physiological state which explains the granted benefit of MRE for staging liver fibrosis and its potential in numerous medical and biological domains. In comparison to the other modalities used to perform such measurement, Magnetic Resonance (MR) techniques offer the advantages of acquiring 3D high spatial resolution images at high penetration depth. However, performing MRE tissue characterization requires low frequency shear waves propagating in the tissue. Inducing them is the role of a mechanical actuator specifically designed to operate under Magnetic Resonance Imaging (MRI) specific restrictions in terms of electromagnetic compatibility. Facing these restrictions, many different solutions have been proposed while keeping a common structure: a vibration generator, a coupling device transmitting the vibration and a piston responsible for the mechanical coupling of the actuator with the tissue. The following review details the MRI constraints and how they are shaping the existing actuators. An emphasis is put on piezoelectric solutions as they solve the main issues encountered with other actuator technologies. Finally, flexible electroactive materials are reviewed as they could open great perspectives to build new type of mechanical actuators with better adaptability, greater ease-of-use and more compactness of dedicated actuators for MRE of small soft samples and superficial organs such as skin, muscles or breast.

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“…Moreover, the electrical to mechanical efficiency has been discussed and measured in [8]. The low energy conversion ratio indicates that most electrical energy must be stored in the capacitive actuator.…”

Section: Characteristics Of Tubular Deap Actuatormentioning

confidence: 99%

“…The low energy conversion ratio indicates that most electrical energy must be stored in the capacitive actuator. Therefore, a high voltage driving converter with the ability to recover the energy back to the power source is beneficial to improve the overall energy utilization ratio [1], [8].…”

Section: Characteristics Of Tubular Deap Actuatormentioning

confidence: 99%