Adaptive antenna shape control using piezoelectric actuators

Agrawal, Brij N.; Elshafei, M. Adnan; Song, Gangbing

doi:10.1016/s0094-5765(97)00185-9

Cited by 50 publications

(31 citation statements)

References 9 publications

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“…Since the crack in this period is much larger than the previous step from 1100 to 2100, the propagating stress wave attenuates more than the previous period. The cycles (6)(7)(8)(9)(10)(11) shown in the damage index are more clear than the previous cycles (1)(2)(3)(4)(5). In addition, the highest values of the damage index reached to one, which implies the concrete column was subject to severe damage in the maximum displacement of each cycle.…”

Section: Wavelet Packet-based Structural Damage Indicesmentioning

confidence: 85%

“…Step 2100, the concrete column was subject to five initial simulated pseudo-dynamic loading cycles (1)(2)(3)(4)(5), as shown in Figure 9. When load increased, the bottom cracks opened and the structural damage increased.…”

Section: Wavelet Packet-based Structural Damage Indicesmentioning

confidence: 99%

“…With attractive features of low-cost, small size, large bandwidth, and actuating-sensing functions, piezoceramics have been increasingly employed in many engineering fields [3][4][5][6][7]. In this project, piezoceramic-based devices, called smart aggregates (SA), were utilized as transducers for structural health monitoring of RC columns under a pseudo-dynamic loading procedure.…”

Section: Introductionmentioning

confidence: 99%

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Cyclic Crack Monitoring of a Reinforced Concrete Column under Simulated Pseudo-Dynamic Loading Using Piezoceramic-Based Smart Aggregates

Robert²,

et al. 2016

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Structural health monitoring is an important aspect of maintenance for bridge columns in areas of high seismic activity. In this project, recently developed piezoceramic-based transducers, known as smart aggregates (SA), were utilized to perform structural health monitoring of a reinforced concrete (RC) bridge column subjected to pseudo-dynamic loading. The SA-based approach has been previously verified for static and dynamic loading but never for pseudo-dynamic loading. Based on the developed SAs, an active-sensing approach was developed to perform real-time health status evaluation of the RC column during the loading procedure. The existence of cracks attenuated the stress wave transmission energy during the loading procedure and reduced the amplitudes of the signal received by SA sensors. To detect the crack evolution and evaluate the damage severity, a wavelet packet-based structural damage index was developed. Experimental results verified the effectiveness of the SAs in structural health monitoring of the RC column under pseudo-dynamic loading. In addition to monitoring the general severity of the damage, the local structural damage indices show potential to report the cyclic crack open-close phenomenon subjected to the pseudo-dynamic loading.

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Section: Wavelet Packet-based Structural Damage Indicesmentioning

confidence: 85%

Section: Wavelet Packet-based Structural Damage Indicesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cyclic Crack Monitoring of a Reinforced Concrete Column under Simulated Pseudo-Dynamic Loading Using Piezoceramic-Based Smart Aggregates

Robert²,

et al. 2016

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“…A variety of high-speed and high-precision mechanical structures require extremely precise shape and position when in operation, and slight variations greatly influence the dynamic performances of these structures [1,2]. For instance, mismachining tolerance, humidity and temperature of the working environment, material wear and aging, and unknown external load disturbances may affect the shape of a structure.…”

Section: Introductionmentioning

confidence: 99%

Optimal Shape Control of Piezoelectric Intelligent Structure Based on Genetic Algorithm

Wang

Qin

Zhang

et al. 2017

Advances in Materials Science and Engineering

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Shape variation induced by mismachining tolerance, humidity and temperature of the working environment, material wear and aging, and unknown external load disturbances have a relatively large influence on the dynamic shape of a mechanical structure. When integrating piezoelectric elements into the main mechanical structure, active control of the structural shape is realized by utilizing the inverse piezoelectric effect. This paper presents a mathematical model regarding piezoelectric intelligent structure shape control. We also applied a genetic algorithm, and given a piezoelectric intelligent cantilever plate with both ends affected by a certain load, optimal shape control results of piezoelectric materials were analyzed from different perspectives (precision reference or cost reference). The mathematical model and results indicate that, by optimizing a certain number of piezoelectric actuators, high-precision active shape control can be realized.

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“…Performance of such systems deteriorates with the distortion in their shape and surface. These distortions may get introduced due to manufacturing defects, in-orbit thermal distortion, material degradation, loose structural joints or creep as stated in Agrawal, Elshafei, and Song (1997). To keep the distortion level within prescribed limit or to retain the original shape, piezoelectric actuators are utilised for the shape control.…”

Section: Introductionmentioning

confidence: 99%

Shape control of spacecraft antenna reflector using lead-free piezoelectric actuators

Susheel

Kumar

Chauhan

et al. 2014

European Journal of Computational Mechanics

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The spacecraft antenna reflector orbiting in the space environment would be exposed to continuous variation in both temperature level and temperature distribution because of the variation of solar radiation and shadowing conditions (temperature varies from −80 to 180°C). The thermally induced structural responses would occur with the variations of the on-orbit thermal loads. Thermal induced deformation could adversely affect the performance of antenna reflector. The thermally induced deformation can be controlled using lead-based piezoelectric actuator. In the last few decades, these lead-based piezoelectric ceramics are used abundantly due to their superior performance. However, these lead-based piezoelectric ceramics are toxic in nature and cause severe health and environmental problems during its fabrication. In this study, thermally induced deformations in the antenna reflector are controlled using lead-free piezoelectric ceramics. Finite element formulation of layered composite antenna reflector has been presented to predict the deformation. Further beam shaping and beam steering of the antenna reflector through the piezoelectric actuator has been demonstrated. Finally active shape control of antenna reflector has been demonstrated by optimising the size and location of piezoelectric patches and the applied electric potential.

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Adaptive antenna shape control using piezoelectric actuators

Cited by 50 publications

References 9 publications

Cyclic Crack Monitoring of a Reinforced Concrete Column under Simulated Pseudo-Dynamic Loading Using Piezoceramic-Based Smart Aggregates

Cyclic Crack Monitoring of a Reinforced Concrete Column under Simulated Pseudo-Dynamic Loading Using Piezoceramic-Based Smart Aggregates

Optimal Shape Control of Piezoelectric Intelligent Structure Based on Genetic Algorithm

Shape control of spacecraft antenna reflector using lead-free piezoelectric actuators

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