|Table of Contents|

Design and testing on micro-deformation amplified piezoelectric device for road self-powered monitoring(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2025年03期
Page:
1-16
Research Field:
道路工程
Publishing date:

Info

Title:
Design and testing on micro-deformation amplified piezoelectric device for road self-powered monitoring
Author(s):
WANG Chao-hui1;  LU Qiang1;  WANG Shuai1; 2;  CHEN Yi-wen1; 3;  JIA Xiao-dong1
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. School of Hydraulic and Civil Engineering, Ludong University, Yantai 264025, Shandong, China; 3. School of Future Transportation, Chang'an University, Xi'an 710064, Shaanxi, China)
Keywords:
road engineering;  cantilever beam piezoelectric device;  energy harvesting;  micro-deformation amplification;  monitoring;  design
PACS:
U416
DOI:
10.19721/j.cnki.1671-8879.2025.03.001
Abstract:
To address the issues of mismatch between pavement micro-deformation and excitation displacement of cantilever beam piezoelectric transducer, as well as the low adaptability of planar dimensions of piezoelectric device to road traffic rolling, a cantilever beam piezoelectric device with amplified internal stroke and high rolling adaptability was designed. Based on the deviation rolling condition, the sinking characteristics of cover plates with different lateral sizes were analyzed, and the lateral size for the cover plate's stable sinking under the deviation rolling condition was determined. Combining with the stress distribution and warping deformation characteristics of the cover plate under the complete rolling condition, the longitudinal size with high buckling stability of the cover plate was optimized. Considering the road deformation and the frequency characteristics of vehicle rolling, the energy output performance and operational durability of the piezoelectric device under different loading conditions were systematically investigated, and the monitoring application scheme of self-powered road sensor based on this piezoelectric device was proposed. The research results indicate that the increase in the lateral size is beneficial to improve the sinking stability of the device cover plate when the wheel is biased. The cover plate completely sinks when the point at which the wheel deviates from the rolling path exceeds 3/8 of the cover plate. With a lateral size of 180 mm for the cover plate, the spacing between cover plate and side plate has less discreteness compared with other lateral sizes, and the side of the cover plate sinks smoothly. Under the complete rolling condition, when the aspect ratio of the cover plate is 0.9-1.1, the warping deformation and warping stress at corner and middle area on sides of the cover plate are relatively small, and the buckling stability is relatively high. Combining with the mechanical properties of the cover plate under different rolling conditions, the planar size of the device with stable bearing performance is 180 mm×180 mm. The piezoelectric device can stably output 14 mJ of energy per actuation when the excitation displacement is 0.7 mm, and the excitation frequency is 12 Hz. After 100 000 loading cycles, the change rate of the energy output by the piezoelectric device is less than 1%, indicating excellent durability in electrical output performance. Deploying four developed piezoelectric devices suffices to meet the power demand for road sensor monitoring.1 tab, 15 figs, 33 refs.

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Last Update: 2025-05-30