Impedance-Based Structural Health Monitoring for Temperature Varying Applications
TLDR
In this article, a new structural health monitoring technique capable of in-service, on-line incipient damage detection has been proposed by the Center for Intelligent Material Systems and Structures, physical changes in a structure cause changes in the mechanical impedance.Abstract:
A new structural health monitoring technique capable of in-service, on-line incipient damage detection has been proposed by the Center for Intelligent Material Systems and Structures, Physical changes in a structure cause changes in the mechanical impedance. Due to the electromechanical coupling in piezoelectric materials, this change causes a change in the electrical impedance of the piezoelectric sensor. Hence, by monitoring the electrical impedance and comparing this to a baseline measurement, we can determine when structural damage has either occurred or is imminent. However, in almost all practical health monitoring applications, the structure being monitored is constantly undergoing change due to the effect of external boundary conditions. One of the important factors that leads to this change is the temperature variations. In this paper, temperature effects on the electrical impedance of piezoelectric materials and the structures have been investigated. A computer algorithm was developed which incorporates temperature compensation into our health monitoring applications. Three experimental investigations were performed successfully under the temperature varying condition, in the range of 25 to 75°C, including a bolted pipe structure, composite reinforced aluminum and precision part such as gears. It was found that, by this compensation procedure, the impedance based health monitoring tehcnique is able to detect damage in the incipient stage, even with the presence of significant temperature variation.read more
Citations
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A review of structural health monitoring literature 1996-2001
TL;DR: An updated review covering the years 1996 2001 will summarize the outcome of an updated review of the structural health monitoring literature, finding that although there are many more SHM studies being reported, the investigators, in general, have not yet fully embraced the well-developed tools from statistical pattern recognition.
Journal ArticleDOI
Overview of Piezoelectric Impedance-Based Health Monitoring and Path Forward
TL;DR: In this article, Niezrecki et al. summarized the hardware and software issues of impedance-based structural health modi- toring based on piezoelectric materials.
Journal ArticleDOI
Impedance-based health monitoring of civil structural components
TL;DR: In this article, the use of highfrequency structural excitations through a surface-bonded piezoelectric sensor/actuator is proposed to detect changes in structural point impedance due to the presence of damage.
Journal ArticleDOI
Improving Accessibility of the Impedance-Based Structural Health Monitoring Method:
TL;DR: In this paper, an operational amplifier-based turnkey device that can measure and record the electric impedance of a PZT has been developed, which can be used in a wide variety of practical field applications.
Journal ArticleDOI
Feasibility of using impedance‐based damage assessment for pipeline structures
TL;DR: In this paper, the feasibility of using an impedance-based health monitoring technique in monitoring a critical civil facility is presented, using high-frequency structural excitation (typically greater than 30 kHz) through surface-bonded piezoelectric sensors/actuators to detect changes in structural point impedance due to the presence of damage.
References
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Proceedings ArticleDOI
Automated real-time structure health monitoring via signature pattern recognition
TL;DR: Liang et al. as discussed by the authors used an array of PZ1 patches bonded to the truss-based sceframe as integrated sensor-actuators, an electric impedance analyzer for structural frequency response function (FRF) acquisition and a PC for control and graphic display.
Proceedings ArticleDOI
Local-area health monitoring of aircraft via piezoelectric actuator/sensor patches
TL;DR: In this paper, a high-frequency-electrical-impedance-signature-based technique for structural integrity monitoring is presented, which relies on tracking the highfrequency (typically > 50 kHz) point impedance of the structure to identify damage.
Proceedings ArticleDOI
Monitoring the integrity of composite patch structural repair via piezoelectric actuators/sensors
TL;DR: In this paper, a vibration signature is obtained as a variation in electrical impedance of the piezoelectric patch, while driven by a fixed alternating electric field over a frequency range.
Proceedings ArticleDOI
Structural frequency response function acquisition via electric impedance measurement of surface-bonded piezoelectric sensor /actuator
TL;DR: In this article, the authors presented a new technique for acquiring structural frequency response function (FRF) via measurement of electric impedance of a piezoceramic (PZT) patch bonded to a structure.
Proceedings ArticleDOI
Removing effects of temperature changes from piezoelectric impedance-based qualitative health monitoring
TL;DR: In this paper, the effect of temperature on the electrical impedance of piezoelectric sensors and the structural properties of a bolted pipe was investigated using a high frequency NDE technique.