Effect of a Cable Rupture on Tensegrity Systems

Kahla, Nabil Ben; Moussa, B.

doi:10.1260/026635102760123051

Cited by 25 publications

(13 citation statements)

References 3 publications

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“…Korkmaz et al [25] introduce a method for self-repair of a pedestrian bridge intended to meet safety and serviceability in case of a cable damage. Ben Kahla and Moussa [26] study the effect of member loss on tensegrity systems, and Adam and Smith [27] introduce a control framework for civil-engineering structure including self-diagnose. Pellegrino [28] (b) (c) (a)…”

Section: Active Tensegrity Boomsmentioning

confidence: 99%

Improving Bending Stiffness of Tensegrity Booms

Dalilsafaei

Eriksson

Tibert

2012

International Journal of Space Structures

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There is a high interest in employing lightweight, low-cost, deployable structures for space missions. Utilization of tensegrity structures in space application is limited, due to their low stiffness, while a number of high stiffness-to-mass truss booms have been launched. This paper aims to describe and improve the bending stiffness of tensegrity booms. Tensegrity booms of Snelson and triangular prism type are selected for the study. These structures are excellent samples of class 1 tensegrities, with a single state of self-stress and one mechanism, and class 2 tensegrities, with multiple states of self-stress and mechanisms. The stiffness modification procedure includes three steps: (Step 1) developing a strategy for a fair comparison of tensegrity booms with a high performance truss boom. A genetic algorithm is employed to find the optimum cross-section areas of the boom elements. Sources of low stiffness of tensegrities are discussed. (Step 2) an effort is made to find the optimum placement of actuators for improving the stiffness of the tensegrity booms. (Step 3) a genetic algorithm is utilized to calculate their optimum actuation. All three stages have been performed based on a link between non-linear finite element analysis and a genetic algorithm. The genetic algorithm shows high accuracy of searching non-structural space, and also dealing with above steps. Results indicate that the stiffness of tensegrity booms is highly improved by activating the structures.

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Section: Active Tensegrity Boomsmentioning

confidence: 99%

Improving Bending Stiffness of Tensegrity Booms

Dalilsafaei

Eriksson

Tibert

2012

International Journal of Space Structures

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“…Korkmaz et al [29] study several failure scenarios and introduce active control for self-repair. Ben Kahla et al [30] investigate the influence of sudden cable rupture in a beam-like tensegrity not considering the influence of external loads.…”

Section: Sensitivity To Element Failurementioning

confidence: 99%

Design and Analysis of Tensegrity Power Lines

Dalilsafaei

Tibert

2012

International Journal of Space Structures

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Overhead transmission power lines have undergone very small aesthetic and technical changes over time. Studies on mitigation of the electromagnetic field shows that utilizing a helix configuration is an effective way to reduce the electromagnetic field. This study proposes to use tensegrity structures as power lines. Tensegrity structures are composed of tension and compression elements in equilibrium. Modules, simple units with a certain rotation, are connected together to design of overhead power lines with considerable electromagnetic field reduction. A form-finding method enables the design of various free-form configurations. A parametric study is performed to investigate the influence of the module dimensions on the stiffness of the power line. A design algorithm was used for determining the optimum size of elements and the pre-stress level. The selected baseline structure was able to tolerate the wind and ice loads in severe conditions with a 50 times reduction in electromagnetic field. Finally a sensitivity analysis is performed to show the effects of element loss or damage.

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“…The investigation included non-linear elasto-plastic analysis and partial damage such as cable yielding and the dynamic response was studied. Following this study, Kahla and Moussa (2002) analyzed the effect of a cable rupture on tensegrity systems through nonlinear dynamic simulation (Sultan et al, 2002). Neither cable yielding nor strut buckling was included in the study.…”

Section: Introductionmentioning

confidence: 99%

Using dynamic measurements to detect and locate ruptured cables on a tensegrity structure

Sychterz

Smith

2018

Engineering Structures

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Tensegrity structures are cable-strut systems held in equilibrium due to self-stress. There is potential for damage tolerance when they are kinematically redundant. In this paper, detection and location of a ruptured cable in a deployable tensegrity footbridge are studied through monitoring changes in dynamic behavior. Position values and axial load values of elements are measured before, during, and after a cable breakage. Free and forced-vibration-induced dynamic behavior of the tensegrity structure are characterized in the state of deployment (one half of the structure) and in-service (full structure). Examination of ambient vibrations for the half structure and forced vibrations for the full structure successfully led to detection of ruptured cables. Exclusion of possible damage cases for location using measurements effectively reduces the number of candidate cases when using nodal displacement measurements. Correlation methods using strain measurements are also successful to locate a ruptured cable. These methods reveal the potential for self-diagnosis of complex sensed structures.

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Effect of a Cable Rupture on Tensegrity Systems

Cited by 25 publications

References 3 publications

Improving Bending Stiffness of Tensegrity Booms

Improving Bending Stiffness of Tensegrity Booms

Design and Analysis of Tensegrity Power Lines

Using dynamic measurements to detect and locate ruptured cables on a tensegrity structure

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