Elastic wave generation by piezoceramic patches

Moetakef, Mohammad; Joshi, S. K.; Lawrence, K. L.

doi:10.2514/3.13359

Cited by 26 publications

(11 citation statements)

References 6 publications

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“…The application of this method is discussed using a cantilever aluminum beam with surface bonded piezoelectric actuators as a sample problem. The results in terms of transient response obtained from the model based on the thermal analogy are compared with the results computed by Moetakef et al [5] and excellent agreement is observed. It is concluded that the use of the thermal analogy to simulate the dynamic behavior of a piezoelectric structures leads to promising results.…”

Section: Discussionmentioning

confidence: 79%

“…This approach is then used to predict the transient response of a cantilever aluminum beam with surface bonded piezoelectric actuators. Comparing the results from the current approach with FEM results based on tri-dimensional piezoelectric elements and the corresponding experimental results for the same case [5], the accuracy of the thermal analogy method is validated in this study.…”

Section: Introductionmentioning

confidence: 87%

See 1 more Smart Citation

Dynamic analysis of structures with piezoelectric actuators based on thermal analogy method

Dong

Meng

2005

Int J Adv Manuf Technol

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The thermal analogy method is presented to predict the dynamic behavior of complex structures with piezoelectric actuators. Based on the analogy between the converse piezoelectric effect and thermoelastic effect, an applied electric field is modeled as a thermal load and piezoelectric strain coefficients characterizing an actuator are input as thermal expansion coefficients. Thus a voltage actuation can be exactly simulated using conventional tri-dimensional elastic elements with the thermal actuation rather than using piezoelectric elements. Finally, numerical results in terms of the transient response of a cantilever beam with surface bonded piezoelectric actuators demonstrates the validity of this method, which can be used to assist in the design of complex smart structures and implementation of piezoelectric control systems.

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Section: Discussionmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 87%

Dynamic analysis of structures with piezoelectric actuators based on thermal analogy method

Dong

Meng

2005

Int J Adv Manuf Technol

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“…Other damage detection criteria, e.g., based on wave propagation, are also being studied (Chang, 1998). Moetakef et al (1996) analyzed experimentally and numerically the capability of piezoceramic patches to generate elastic waves in beams and plates and discussed the possibility of using this method for damage detection. Lakshmanan and Pines (1997) used wave propagation to detect transverse cracks in a rotating composite beam from the scattering properties of the structure.…”

Section: Wave Propagation Methodologiesmentioning

confidence: 99%

Active sensors for health monitoring of aging aerospace structures

Giurgiutiu

Redmond²,

Roach³

et al. 2000

SPIE Proceedings

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A project to develop non-intrusive active sensors that can be applied on existing aging aerospace structures for monitoring the onset and progress of structural damage (fatigue cracks and corrosion) is presented. The state of the art in active sensors structural health monitoring and damage detection is reviewed. Methods based on (a) elastic wave propagation and (b) electro-mechanical (E/M) impedance technique are cited and briefly discussed. The instrumentation of these specimens with piezoelectric active sensors is illustrated. The main detection strategies (E/M impedance for local area detection and wave propagation for wide area interrogation) are discussed. The signal processing and damage interpretation algorithms are tuned to the specific structural interrogation method used. In the high-frequency E/M impedance approach, pattern recognition methods are used to compare impedance signatures taken at various time intervals and to identify damage presence and progression from the change in these signatures. In the wave propagation approach, the acousto-ultrasonic methods identifying additional reflection generated from the damage site and changes in transmission velocity and phase are used. Both approaches benefit from the use of artificial intelligence neural networks algorithms that can extract damage features based on a learning process. Design and fabrication of a set of structural specimens representative of aging aerospace structures is presented. Three built-up specimens, (pristine, with cracks, and with corrosion damage) are used. The specimen instrumentation with active sensors fabricated at the University of South Carolina is illustrated. Preliminary results obtained with the E/M impedance method on pristine and cracked specimens are presented.

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“…Moetakef et al (1996) studied theoretically and experimentally the elastic-wave generation by PWAS. Chang (1988Chang ( , 2001), Wang and Chang (2000), and Ihn and Chang (2002) studied the use of PWAS for generation and reception of elastic waves in composite materials.…”

Section: Piezoelectric-wafer Active Sensorsmentioning

confidence: 99%

Piezoelectric Wafer Embedded Active Sensors for Aging Aircraft Structural Health Monitoring

Giurgiutiu

Zagrai

Bao

2002

Structural Health Monitoring

505

318

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Piezoelectric wafer active sensors may be applied on aging aircraft structures to monitor the onset and progress of structural damage such as fatigue cracks and corrosion. The state of the art in piezoelectric-wafer active sensors structural health monitoring and damage detection is reviewed. Methods based on (a) elastic wave propagation and (b) the Electro-Mechanical (E/M) impedance technique are cited and briefly discussed. For health monitoring of aging aircraft structures, two main detection strategies are considered: the E/M impedance method for near field damage detection, and wave propagation methods for far-field damage detection. These methods are developed and verified on simple-geometry specimens and on realistic aging aircraft panels with seeded cracks and corrosion. The experimental methods, signal processing, and damage detection algorithms are tuned to the specific method used for structural interrogation. In the E/M impedance method approach, the high-frequency spectrum, representative of the structural resonances, is recorded. Then, overallstatistics damage metrics can be used to compare the impedance signatures and correlate the change in these signatures with the damage progression and intensity. In our experiments, the (1 À R 2 ) 3 damage metric was found to best fit the results in the 300-450 kHz band. In the wave propagation approach, the pulse-echo and acousto-ultrasonic methods can be utilized to identify the additional reflections generated from crack damage and the changes in transmission phase and velocity associated with corrosion damage. The paper ends with a conceptual design of a structural health monitoring system and suggestions for aging aircraft installation utilizing active-sensor arrays, data concentrators, wireless transmission, and a health monitoring and processing unit.

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Elastic wave generation by piezoceramic patches

Cited by 26 publications

References 6 publications

Dynamic analysis of structures with piezoelectric actuators based on thermal analogy method

Dynamic analysis of structures with piezoelectric actuators based on thermal analogy method

Active sensors for health monitoring of aging aerospace structures

Piezoelectric Wafer Embedded Active Sensors for Aging Aircraft Structural Health Monitoring

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