Multiscale Acceleration-Dynamic Strain-Impedance Sensor System for Structural Health Monitoring

Abstract

A multiscale wireless sensor system is designed for vibration-and impedance-based structural health monitoring. In order to achieve the objective, the following approaches are implemented. Firstly, smart sensor nodes for vibration and impedance monitoring are designed. In the design, Imote2 platform which has high performance microcontroller, large amount of memory, and flexible radio communication is implemented to acceleration and impedance sensor nodes. Acceleration sensor node is modified to measure PZT's dynamic strain along with acceleration. A solar-power harvesting unit is implemented for power supply to the sensor system. Secondly, operation logics of the multi-scale sensor nodes are programmed based on the concept of the decentralized sensor network. Finally, the performance of the multi-scale sensor system is evaluated on a lab-scale beam to examine the long-term monitoring capacities under various weather conditions.

Development and Application of Structural Health Monitoring System Based on Piezoelectric Sensors

“…The overall structural design of the system is divided into hardware configuration and software design [27]. The hardware configuration of the system mainly consists of the selection of sensors, data acquisition instrument, and other ancillary equipment.…”

A Multi-scale Approach to Statistical and Model-based Structural Health Monitoring with Application to Embedded Sensing for Wind Energy

“…The wireless data acquisition (WiDAQ) extension for the WID3 demonstrated the ability to collect low-frequency vibration data for modal analysis in addition to the node's core impedance function [2]. Some recent work has aimed to extend the iMote2 to multi-scale SHM applications [66,67], by including an accelerometer connected to spare analog input channel on the iMote2's SHM board, utilizing both measurements in a multi-scale SHM assessment of a test structure. The WASP implements multi-scale sensing functionality on a single platform, using a single 6-channel analog-to-digital converter (ADC) to record passive, low-frequency sensor output or transducer response to simultaneous, high-frequency excitation.…”

Damage‐sensitive impedance sensor placement on multi‐strand anchorage based on local stress variation analysis

“…However, the direct attachment the PZTs often leads to the difficulty in selecting suitable frequency ranges for damage detection tasks. To overcome these drawbacks, smart piezoelectric interfaces were designed for alternative impedance measurement . The piezoelectric interface technique was verified for prestress loss monitoring of a mono‐strand PSC girder …”