LAUSR

Sustainable powering of wire-free sensors (WFSs) is a critical challenge in structure health monitoring for failure prevention applications, where battery replacement is practically difficult. Hence, it is of interest to develop means for remotely charging WFS devices using external power sources. In this paper, a novel stress wave-based optimization method is proposed for piezoelectric sensors wire-free charging. This method includes a novel waveform optimization scheme, a novel multiactuator, and a multichannel wire-free charging strategy to maximize energy transmission efficiency. Based on the measured channel characteristics of a tightly insulated environment, four different waveform design algorithms are implemented successfully to generate the optimized charging waveforms in accordance with the novel waveform optimization scheme. To testify the effectiveness of this novel optimized wire-free charging method, the piezoelectric sensor-based wire-free charging process is simulated. In the simulation process, a predefined waveform is applied in the piezoelectric actuator to generate a stress wave which is subsequently utilized to wire-free transfer energy to the piezoelectric sensors. Numerical results demonstrate the advantages of multichannel wire-free charging in significantly reducing input power loss and enhancing energy transmission efficiency.