Abstract
Wireless ultrasonic vibration energy transmission systems through metal barriers based on piezoelectric transducers have drawn a lot of focus due to the advantage of nonpenetration of the barriers, thus maintaining the integrity of sealed structures. It is meaningful to investigate appropriate modeling methods and to characterize such wireless ultrasonic energy transmission channels with different geometric shapes. In this paper, equivalent circuit modeling and finite element modeling methods are applied to the planar metal barrier channel, and a 3‐dimensional finite element modeling method is applied to the cylindrical metallic barrier channel. Meanwhile, the experimental setup is established and measurements are carried out to validate the effectiveness of the corresponding modeling methods. The results show that Leach’s equivalent circuit modeling method and finite element modeling method are nearly similarly effective in characterizing the planar metal barrier channel. But for a cylindrical metal barrier, only the three‐dimensional finite element modeling method is effective. Furthermore, we found that, for the planar barrier, the effect of standing waves on the efficiency of wireless energy transmission is dominated. But for the curved barrier, only the resonant phenomenon of the piezoelectric transducer exists.
Highlights
Powering, communicating with sensors or electronic systems located in the isolated or hermitical metallic structures, requires the use of physical penetrations and wire feed-through
Traditional electromagnetic approaches for wireless energy and signal transmission are inhibited in these applications due to the strong Faraday shielding effect presented by the metal barriers
The outside transmitting piezoelectric transducer generates ultrasonic mechanical vibrations, and ultrasonic vibrations propagate through the metal barrier and are received by the inside receiving transducer and converted to electric energy
Summary
Powering, communicating with sensors or electronic systems located in the isolated or hermitical metallic structures, requires the use of physical penetrations and wire feed-through. Ultrasonic waves can be used to transmit vibration energy through a metal barrier wirelessly to power and communicate with the electronics enclosed in hermitical metal structures. Such systems or acoustic-electric channels are usually formed by coaxially aligning and acoustically coupling a pair of piezoelectric transducers (PZTs) to opposite sides of a metal barrier. A two-dimensional finite element model is established for the same channel and simulation results are obtained using Comsol software Both modeling results are compared with experimental measuring results to validate the effectiveness of the modeling methods based on the established physical channel and experimental setup. Simulation and experimental results show that there are no multiple peaks and valleys in characteristics curves versus frequency for the cylindrical barrier channel which is different from what occurs in the planar metal barrier channel
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