Efficient electromechanical network model for wireless acoustic-electric feed-throughs

Sherrit, Stewart; Bădescu, Mircea; Bao, Xiaoqi; Bar‐Cohen, Yoseph; Chang, Zenghu

doi:10.1117/12.598300

Cited by 42 publications

(33 citation statements)

References 9 publications

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“…In previous work we have shown that the Mason's equivalent network models produced results identical with the solution to the wave equation in layered structures [7] if the loss was treated in a similar fashion for each model. The solution to the model proceeds as with any network solution.…”

Section: Introductionmentioning

confidence: 57%

Acoustic mechanical feedthroughs

et al. 2013

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Electromagnetic motors can have problems when operating in extreme environments. In addition, if one needs to do mechanical work outside a structure, electrical feedthroughs are required to transport the electric power to drive the motor. In this paper, we present designs for driving rotary and linear motors by pumping stress waves across a structure or barrier. We accomplish this by designing a piezoelectric actuator on one side of the structure and a resonance structure that is matched to the piezoelectric resonance of the actuator on the other side. Typically, piezoelectric motors can be designed with high torques and lower speeds without the need for gears. One can also use other actuation materials such as electrostrictive, or magnetostrictive materials in a benign environment and transmit the power in acoustic form as a stress wave and actuate mechanisms that are external to the benign environment. This technology removes the need to perforate a structure and allows work to be done directly on the other side of a structure without the use of electrical feedthroughs, which can weaken the structure, pipe, or vessel. Acoustic energy is pumped as a stress wave at a set frequency or range of frequencies to produce rotary or linear motion in a structure. This method of transferring useful mechanical work across solid barriers by pumping acoustic energy through a resonant structure features the ability to transfer work (rotary or linear motion) across pressure or thermal barriers, or in a sterile environment, without generating contaminants. Reflectors in the wall of barriers can be designed to enhance the efficiency of the energy/power transmission. The method features the ability to produce a bi-directional driving mechanism using higher-mode resonances. There are a variety of applications where the presence of a motor is complicated by thermal or chemical environments that would be hostile to the motor components and reduce life and, in some instances, not be feasible. A variety of designs that have been designed, fabricated and tested will be presented.

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Section: Introductionmentioning

confidence: 57%

Acoustic mechanical feedthroughs

et al. 2013

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“…For the sake of simplicity, in Fig. 2(a) an air backing has been used as a replacement for the front and tail mass [25]. For a disk-shaped transducer with diameter D the ultrasonic near-field depth L is given by [26] …”

Section: A Ultrasonic Power Transfer and Telemetry Modelmentioning

confidence: 99%

Design of a CMOS System-on-Chip for Passive, Near-Field Ultrasonic Energy Harvesting and Back-Telemetry

Feng

Lajnef

Chakrabartty

2016

IEEE Trans. VLSI Syst.

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Many packaging and structural materials are made of conductive materials such as metal or carbon-fiber composites, which limits the use of embedded radio frequency-based telemetry systems for sensing. In this paper, we present the design of a complete passive ultrasonic energy harvesting and back-telemetry system that exploits near-field acoustic coupling to wirelessly transfer energy and data across conductive barriers. The use of near-field operation makes the telemetry robust to multipath reflections that occur at barrier discontinuities and robust to crosstalk when multiple sensors are simultaneously interrogated. Underlying the proposed architecture is a systemon-chip (SoC) that integrates different ultrasonic energy harvesting and telemetry modules. The operation of the system has been verified using SoC prototypes fabricated in a 0.5-µm CMOS process which have been integrated with a piezoelectric transducer attached to an aerospace-grade aluminum substrate. Measured results show that the proposed near-field ultrasonic telemetry system can effectively operate across a 2-mm-thick metallic barrier at a frequency of 13.56 MHz with the SoC consuming 22.3 µW of power.Index Terms-Energy scavenging, Mason model, near-field back-telemetry, structural health monitoring, ultrasonic communication.

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“…after receiving the vibrations, the inner transducer converts the mechanical energy into electric energy again via the converse piezoelectric effect. sherrit et al [8], [9] and bao et al [1], [10] investigated the energy loss of this transmission system by experiments and finite element computations. saulnier et al [11] and Primerano et al [12] have used ultrasound piezoelectric transducers to study wireless communication through a solid steel wall, where the conventional radio frequency communications cannot be applied due to the shielding of the steel.…”

Section: Introductionmentioning

confidence: 99%

A system of two piezoelectric transducers and a storage circuit for wireless energy transmission through a thin metal wall

Chen

et al. 2008

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

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A system to wirelessly convey electric energy through a thin metal wall is proposed in the paper, where 2 piezoelectric transducers are used to realize energy transformation between electric and mechanical, and a rechargeable battery is employed to store the transmitted energy. To integrate them as a whole, an interface of a modulating circuit is applied between the transducer system and the storage battery. In addition, a synchronized switch harvesting on inductor in parallel with the transducer system is introduced to artificially extend the closed interval of the modulating circuit. The process of transmitting energy is computed, and the performance of the transducer system is optimized in detail for a prescribed external electric source. The results obtained are useful for understanding and designing wireless energy supply systems.

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Efficient electromechanical network model for wireless acoustic-electric feed-throughs

Cited by 42 publications

References 9 publications

Acoustic mechanical feedthroughs

Acoustic mechanical feedthroughs

Design of a CMOS System-on-Chip for Passive, Near-Field Ultrasonic Energy Harvesting and Back-Telemetry

A system of two piezoelectric transducers and a storage circuit for wireless energy transmission through a thin metal wall

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