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Vibration health monitoring for tensegrity structures
KTH, School of Engineering Sciences (SCI), Mechanics, Structural Mechanics.ORCID iD: 0000-0001-8064-5463
KTH, School of Engineering Sciences (SCI), Mechanics, Structural Mechanics.ORCID iD: 0000-0002-5819-4544
2017 (English)In: Mechanical systems and signal processing, ISSN 0888-3270, E-ISSN 1096-1216, Vol. 85, 625-637 p.Article in journal (Refereed) Published
Abstract [en]

Tensegrities are assembly structures, getting their equilibrium from the interaction between tension in cables and compression in bars. During their service life, slacking'in their cables and nearness to buckling in their bars need to be monitored to avoid a sudden collapse. This paper discusses how to design the tensegrities to make them feasible for vibrational health monitoring methods. Four topics are discussed; suitable finite elements formulation, pre-measurements analysis to find the locations of excitation and sensors for the interesting modes, the effects from some environmental conditions, and the pre-understanding of the effects from different slacking scenarios.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 85, 625-637 p.
Keyword [en]
Cable-bar structures, Dynamic stiffness, Frequency response function, Pre-simulations, Tensegrity structure, Vibration health monitoring
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-186274DOI: 10.1016/j.ymssp.2016.08.039ISI: 000389095400040Scopus ID: 2-s2.0-84995514089OAI: oai:DiVA.org:kth-186274DiVA: diva2:926690
Note

QC 20160509

Available from: 2016-05-09 Created: 2016-05-09 Last updated: 2017-11-30Bibliographically approved
In thesis
1. Vibration-based Assessment of Tensegrity Structures
Open this publication in new window or tab >>Vibration-based Assessment of Tensegrity Structures
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Vibration structural health monitoring (VHM) uses the vibration properties to evaluate many civil structures during the design steps, building steps and service life.The whole function, expressed by stiffness and frequencies of tensegrity structures are primarily related to the level of pre-stress. The present work investigates the possibilities to use this relation in designing, constructing and evaluating the tensegrity structures.One of the aims of the thesis was to improve the current models for resonance frequency simulation of tensegrities. This has been achieved by introducing the bending behaviour of all components, and by a one-way coupling between the axial force and the stiffness.The environmental temperature effects on vibration properties of tensegrity structures have been also  investigated. Changes in dynamic characteristics due to temperature variations were compared with the changes due to decreasing pre-tension in one of the cables. In general, it is shown that the change in structural frequencies coming from temperature changes could of several magnitude as those from damage.Coinciding natural frequencies and low stiffness are known issues of tensegrity structures. The former can be an obstacle in VHM, while the later normally limits their uses in real engineering applications. It has been shown that the optimum self-stress vector of tensegrity structures can be chosen such that their lowest natural frequency is high, and separated from others.The environmental temperature effects on vibration properties of tensegrity structures were revisited to find a solution such that the natural frequencies of the tensegrity structures are not strongly affected by the changes in the environmental temperature. An asymmetric self-stress vector can be chosen so that the criterion is fulfilled as well as possible. The level of pre-stress can also be regulated to achieve the solution. The last part of this thesis, services as a summary of the work.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2016. 158 p.
Series
TRITA-MEK, ISSN 0348-467X ; 2016:05
Keyword
Tensegrity, Pre-stress, Vibration, Health monitoring, Buckling, Temperature effect, Vibration health monitoring VHM, Optimization
National Category
Applied Mechanics
Research subject
Engineering Mechanics
Identifiers
urn:nbn:se:kth:diva-185789 (URN)
Public defence
2016-05-17, F3, Lindstedtsvägen 26, Stockholm, 13:46 (English)
Opponent
Supervisors
Note

QC 20160429

Available from: 2016-04-29 Created: 2016-04-27 Last updated: 2016-11-16Bibliographically approved

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Ashwear, NasseradeenEriksson, Anders

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