Design and experimental testing of an adaptive shape-morphing tensegrity structure, with frequency self-tuning capabilities, using shape-memory alloys
| Autor: | Andrea Micheletti, Filipe Santos, André F. S. Rodrigues |
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| Rok vydání: | 2015 |
| Předmět: |
Engineering
and optics adaptive vibration control frequency tuning shape-memory alloys shape-morphing tensegrity structures signal processing civil and structural engineering atomic and molecular physics and optics materials science (all) condensed matter physics mechanics of materials electrical and electronic engineering Control theory Tensegrity Settore ICAR/08 - Scienza delle Costruzioni atomic and molecular physics General Materials Science Electrical and Electronic Engineering Civil and Structural Engineering business.industry Self-tuning Natural frequency Shape-memory alloy Condensed Matter Physics Atomic and Molecular Physics and Optics Morphing Mechanics of Materials Signal Processing Actuator Reduction (mathematics) business |
| Zdroj: | Smart Materials and Structures. 24:105008 |
| ISSN: | 1361-665X 0964-1726 |
| DOI: | 10.1088/0964-1726/24/10/105008 |
| Popis: | The present paper explores the capabilities of a tensegrity-inspired tower with regard to frequency tuning by shape morphing. To change the configuration of the proposed structure, shape-memory-alloy (SMA) actuators are used. This actuation principle also takes advantage of the variation of the elastic modulus of SMAs associated with the martensitic transformation. The temperature modulation of the SMA wires is successfully achieved by Joule heating, through a proportional-integral-derivative controller, to change between a low-temperature shape and a high-temperature shape. The implementation of a short-time-Fourier-transform control algorithm allows for the correct identification of the dominant input frequency, associated with the dynamic excitation. This information is used to automatically change the configuration of the structure in order to shift its natural frequency away from that of the dynamic excitation. With this frequency tuning, one obtains a reduction of the accelerations throughout the structure up to about 80%. The good performance of the proposed control approach gives promising indications regarding the use of tensegrity systems, in combination with SMAs, for shape-morphing applications, and, in particular, for self-tuning structures. |
| Databáze: | OpenAIRE |
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