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4 results on '"Impedance-based SHM"'

1. Indicator kriging for damage position prediction by the use of electromechanical impedance-based structural health monitoring

Author

Gonçalves, Daniel Resende, Moura Jr., José dos Reis Vieira de, Pereira, Paulo Elias Carneiro, Mendes, Marcos Vinícius Agapito, and Diniz-Pinto, Henrique Senna

Subjects
Control of mechanical systems, Indicator kriging, Impedance-based SHM, Damage detection technique, Semivariogram, Materials of engineering and construction. Mechanics of materials, TA401-492
Abstract

Some nondestructive techniques of the Structural Health Monitoring (SHM) have improved their analysis in the past decades. Among them, the electromechanical impedance-based SHM technique (EMI-SHM) has been tested in several fields and associated to different statistical methodologies. Considering the nature of the spatial variation of the damage metric data along structures, herein is proposed the use of the indicator kriging method for predicting the existence of a known damage located in the center of an aluminum plate. Maps showing the probability of the damage metric to fall in several value ranges were capable of outlining the areas affected by the damage and predict its location. Comparisons between scenarios with different spacing between PZT patches showed a reduction in the reliability of the model with the increasing of such spacing. Also, for the structure under study, it demonstrates that it is not possible to obtain results by the methodology for distance between sensors/actuators greater than 16.67 cm. However, the results show that this approach can be a viable alternative for using damage metrics to map regions affected by damage and its location.

Published
2021
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2. Indicator kriging for damage position prediction by the use of electromechanical impedance-based structural health monitoring.

Author

Resende Gonçalves, Daniel, Vieira de Moura Jr., José dos Reis, Carneiro Pereira, Paulo Elias, Agapito Mendes, Marcos Vinícius, and Senna Diniz-Pinto, Henrique

Subjects
*STRUCTURAL health monitoring, *KRIGING, *ALUMINUM plates, *SPATIAL variation
Abstract

Some nondestructive techniques of the Structural Health Monitoring (SHM) have improved their analysis in the past decades. Among them, the electromechanical impedance-based SHM technique (EMI-SHM) has been tested in several fields and associated to diVerent statistical methodologies. Considering the nature of the spatial variation of the damage metric data along structures, herein is proposed the use of the indicator kriging method for predicting the existence of a known damage located in the center of an aluminum plate. Maps showing the probability of the damage metric to fall in several value ranges were capable of outlining the areas aVected by the damage and predict its location. Comparisons between scenarios with different spacing between PZT patches showed a reduction in the reliability of themodel with the increasing of such spacing. Also, for the structure under study, it demonstrates that it is not possible to obtain results by the methodology for distance between sensors/actuators greater than 16.67 cm. However, the results show that this approach can be a viable alternative for using damage metrics to map regions affected by damage and its location. [ABSTRACT FROM AUTHOR]

Published
2021
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3. Temperature Compensation Improvements for Impedance Based Structural Health Monitoring

Author

Konchuba, Nicholas, Mechanical Engineering, Inman, Daniel J., Kurdila, Andrew J., and Seidel, Gary D.

Subjects
Structural Health Monitoring, Temperature Compensation, Piezoelectric Materials, Wavelets, Effective Frequency Shift, Discrete Wavelet Transform, Impedance-Based SHM
Abstract

Structural Health Monitoring is a useful tool for reducing maintenance costs and improving the life and performance of engineering structures. Impedance-Based SHM utilizes the coupled electromechanical behavior of piezoelectric materials to detect adverse changes and material and mechanical failures of structures. Environmental variables such as temperature present a challenge to assessing the veracity of damage detected through statistical modeling of impedance signals. An effective frequency shift method was developed to compensate impedance measurements for changes resulting from environmental temperature fluctuations. This thesis investigates how the accuracy of this method can be improved and be applied to a 100oF range of temperatures. Building up the idea of eliminating temperature effects from impedance measurements, this thesis investigates the possibility of using statistical moments to create a temperature independent impedance baseline. Master of Science

Published
2011

4. Development of Structural Health Monitoring Systems Incorporating Acoustic Emission Detection for Spacecraft and Wind Turbine Blades

Author

Yun, Jinsik, Electrical and Computer Engineering, Ha, Dong Sam, Schaumont, Patrick R., and Inman, Daniel J.

Subjects
Structural Health Monitoring, Acoustic Emission, Wireless Sensor Network, Impedance-Based SHM
Abstract

Structural Health Monitoring (SHM) is the science and technology of monitoring and can assess the condition of aerospace, civil, and mechanical infrastructures using a sensing system integrated into the structure. SHM is capable of detecting, locating, and quantifying various types of damage such as cracks, holes, corrosion, delamination, and loose joints, and can be applied to various kinds of infrastructures such as buildings, railroads, windmills, bridges, and aircraft. A major technical challenge for existing SHM systems is high power consumption, which severely limits the range of its applications. In this thesis, we investigated adoption of acoustic emission detection to reduce power dissipation of SHM systems employing the impedance and the Lamb wave methods. An acoustic emission sensor of the proposed system continuously monitors acoustic events, while the SHM system is in sleep mode. The SHM system is evoked to perform the SHM operation only when there is an acoustic event detected by the acoustic emission sensor. The proposed system avoids unnecessary operation of SHM operations, which saves power, and the system is effective for certain applications such as spacecraft and wind turbine blades. We developed prototype systems using a Texas Instruments TMS320F2812 DSP evaluation board for the Lamb wave method and an MSP430 evaluation board for the impedance method. Master of Science

Published
2011

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