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Self-deployable tensegrity structures for adaptive morphing of helium-filled aerostats

Knap Lech, Świercz Andrzej, Graczykowski Cezary, Holnicki-Szulc Jan

Archives of Civil and Mechanical Engineering

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2021

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Vol. 21, no. 4

399--416

EN

In this paper, the authors propose, investigate, and discuss a concept of novel type of deployable helium-filled aerostat as a low-cost mean of transport. Internal construction of the aerostat is based on ultra-light tensegrity structure equipped with prestressed tensioned elements of controllable lengths. Such tensegrity structure allows for adaptive morphing of the aerostat understood as simultaneous controllable modifications of aerostat volume and shape during the flight. The controlled volume changes enable influencing buoyancy force and obtaining desired vertical motion during the ascending and descending process. In turn, external shape changes allow for lowering the aerodynamic drag and energy usage needed to uphold stable horizontal position or maintain the desired flight path. Moreover, such internal structure allows for convenient storage, transportation and deployment of the aerostat construction on the ground or in required point at the atmosphere. The article presents an analysis of the exemplary operational mission of the aerostat. The authors introduce the mechanical model capturing interaction of the internal tensegrity structure and aerostat envelope based on the finite-element method, as well as dynamic model allowing for simulation of the aerostat’s vertical and horizontal motion influenced by buoyancy and drag forces. Both these models are used to positively verify the feasibility of the proposed concept of deployable tensegrity-based aerostat with adaptive morphing and its efficiency in realization of the assumed flight mission.

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Prototype of an active tensegrity unit

Platko P., Kmet S.

Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska

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2012

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z. 59, nr 1/I

177-184

EN

Tensegrity structures and hybrid tensegric structures can be defined as spatial systems, which consist only from set of compressed members and set of tensioned members and they can be used to developing systems with a possibility of an active control. Structures with an active control or active structures are equipped with sensors and actuators and they are subjected to continuous monitoring. A test facility with an active tensegrity unit and some basic experimental tests which were carried out are presented in the paper. Results obtained from the experimental tests are compared with the FEM created in ANSYS.

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Koncepcja kładki dla pieszych o konstrukcji tensegrity w Magdalence koło Warszawy

Markocki B., Oleszek R.

Inżynieria i Budownictwo

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2011

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R. 67, nr 10

553-557

PL

Przedstawiono koncepcję nietypowej kładki dla pieszych o konstrukcji cięgnowo-prętowej, w postaci ustroju konstrukcyjnego tensegrity. Jest to układ statyczny, w którym następuje wzajemna stabilizacja elementów rozciąganych i ściskanych, a mechaniczną stabilność ustrój ten uzyskuje dzięki wstępnemu sprężeniu struktury. Omówiono rozwiązanie kładki dla pieszych, przeprowadzającej ruch nad trasą ekspresową S7, mającej postać trzyprzęsłowej konstrukcji o rozpiętości 4,6 + 67,2 + 4,6 m.

EN

The authors present the concept of atypical cable-rod footbridge, employing the principle of tensegrity. Tensegrity structure is a structural system in which the integrity is based on components which are only stressed or tensed. The mechanical stability of this system is achieved by pre-compression of the structure. Further, a design of a footbridge over expressway S7, near Warsaw in Poland is presented, where the authors have implemented basic ideas of tensegrity. The footbridge is a continous three span structure of 4,6 + 67,2 + 4,6 m.