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Reducing effects from environmental temperature on the natural frequencies of 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
(English)In: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568Article in journal, News item (Other (popular science, discussion, etc.)) Submitted
Abstract [en]

n vibration health monitoring, dynamic properties such as natural frequencies and mode shapes are used as tools for assessing the structures health condition.~They are, however, also affected by environmental conditions like wind, humidity and temperature changes. Of particular importance is the change of the environmental temperature, and it is the most commonly considered environmental variable that influences the vibration health monitoring algorithms.~This paper discusses how the tensegrity structures can be designed such that some of their lowest natural frequencies are less sensitive to the temperature changes. A genetic algorithm is used to solve the optimization problem. In the form-finding stage, 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, particularly when a symmetric self-stress vector is chosen.

Place, publisher, year, edition, pages
Elsevier.
National Category
Applied Mechanics
Research subject
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-186273OAI: oai:DiVA.org:kth-186273DiVA: diva2:926686
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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