Dynamic behavior and vibration control of a tensegrity structure

Ali, Nizar Bel Hadj; Smith, Ian F. C.

doi:10.1016/j.ijsolstr.2010.01.012

Cited by 110 publications

(41 citation statements)

References 36 publications

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“…Moreover, tensegrities have some unique features that result from the infinitesimal mechanisms, which are stabilized by self-stress forces. It is possible to control their static and dynamic properties by adjusting the pre-stressing forces [15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Inherent Properties of Smart Tensegrity Structures

Sabouni-Zawadzka¹,

Gilewski²

2018

Applied Sciences

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Abstract:The present paper discusses different aspects of the structural control of smart systems with a focus on tensegrity structures. Special attention is paid to unique features of tensegrity systems, referred to by the authors as inherent, which are induced by infinitesimal mechanisms that are balanced with self-stress states. The following inherent properties are defined: self-control, self-diagnosis, self-repair and self-adjustment (active control). All these features are thoroughly described and illustrated on a series of analyses performed on numerical models of various tensegrity systems. The presented examples of the analyses of different tensegrity modules and multi-module structures show that it is possible to control their properties by adjusting the pre-stressing forces. Moreover, it is proven that the adjustment of self-stress forces in a tensegrity system allows one to repair the damaged structure by compensating the damaged member.

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Section: Introductionmentioning

confidence: 99%

Inherent Properties of Smart Tensegrity Structures

Sabouni-Zawadzka¹,

Gilewski²

2018

Applied Sciences

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“…The symmetric shape change shown in Fig. 1 can be obtained by shortening the vertical cables of a predetermined amount, and by letting the horizontal cables increase in length according to (2), while keeping the length of struts unchanged. In a modular tower composed of several modules (Fig.…”

Section: Compatibility Conditionsmentioning

confidence: 99%

“…Tensegrity structures (TSs) are three-dimensional reticulated systems composed of cables and struts whose stability is provided by a self-stress state between tensioned and compressed members [1,2]. TSs have peculiar properties which make them well suited for shape-morphing applications [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Design and experimental testing of an adaptive shape-morphing tensegrity structure, with frequency self-tuning capabilities, using shape-memory alloys

Santos

Rodrigues

Micheletti

2015

Smart Mater. Struct.

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Abstract. 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 actuators are used. This actuation principle also takes advantage of the variation of the elastic modulus of shape-memory alloys associated with the martensitic transformation. The temperature modulation of the shape-memory-alloy 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 shape-memory alloys, for shapemorphing applications, and, in particular, for self-tuning structures.

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“…Active control was performed through contracting and elongating active struts in order to ensure serviceability of the structure when it was subjected to additional loads [12,13]. Active control was extended to multi-objective control, self-diagnosis and self-repair in situations of cable damage and vibration damping [14][15][16]. Although active control has been applied on tensegrity structures in these studies, none of them carried out an optimization of actuator locations taking into account both stresses and deflections.…”

Section: Introductionmentioning

confidence: 99%

Configuration of control system for damage tolerance of a tensegrity bridge

Korkmaz

Ali

Smith

2012

Advanced Engineering Informatics

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Tensegrity structures are spatial, discrete and lightweight structures that are composed of struts in compression and pre-stressed cables. Stability is provided by the self-stress state between elements independently of external actions. Tensegrity structures are attractive due to their potential for deployability, ease of tuning and high precision control. Since tensegrity structures have highly coupled behavior, placement of actuators is a primary concern when designing active control systems. This study investigates the active control performance of cable members of a tensegrity bridge. The actuation efficiencies of cable members are evaluated through a multi-criteria approach. The configuration of the control system is thus identified through outranking candidate active members. A multi-objective damage tolerance strategy is then proposed and optimally directed control solutions are identified using stochastic search. Case studies for several damage scenarios are examined to validate results. The most efficient active cable configuration is compared with that needed for deployment. This study is divided into two phases. After the description of a 16m-span tensegrity bridge, optimally directed locations of active cables are determined in the first phase. Secondly, a procedure to ensure damage tolerance of the structure is proposed. The multi-objective self-repair procedure provides damage tolerance minimizing both maximum deflections in the structure and stresses in the structural members. Results indicate that the control strategy for deployment is a near-optimal solution for damage tolerance. The proposed methodology is applicable to a range of complex active structures.

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Dynamic behavior and vibration control of a tensegrity structure

Cited by 110 publications

References 36 publications

Inherent Properties of Smart Tensegrity Structures

Inherent Properties of Smart Tensegrity Structures

Design and experimental testing of an adaptive shape-morphing tensegrity structure, with frequency self-tuning capabilities, using shape-memory alloys

Configuration of control system for damage tolerance of a tensegrity bridge

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