By Professor S. Pellegrino (eds.)
Deployable buildings can differ their form instantly from a compact, packaged configuration to an elevated, operational configuration. the 1st thoroughly engineered deployable constructions have been used as stabilization booms on early spacecraft. afterward, extra complicated buildings have been devised for sun arrays, verbal exchange reflectors and telescopes. In different fields there were a number of advancements, together with retractable roofs for stadia, foldable parts for automobiles, moveable constructions for transitority shelters and exhibition screens. 3 major topics are mentioned during this booklet: techniques, operating rules, and mechanics of deployable buildings, either in engineering and biology; furthermore: idea of foldable bar buildings and alertness to deployable tensegrieties; formula of large-rotation research of deployable constructions and finite-element simulation methods.
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Extra resources for Deployable Structures
These cables become taut and pre-tensioned in the fully-deployed configuration, and have the function of increasing the stiffness of the pantograph when it is fully deployed. Further details on this structure can be found in You and Pellegrino (1996). 20 S. 22. FASTmast (Courtesy of AEC Able). 23. Components of pantograph structure. 24. Deployment of pantograph mast. 25 shows a ring-like pantograph formed by the three sets of pairs of rods shown in Fig. 26. The elements of type (a) lie on the inside of the ring, the elements of type (c) lie on the outside, and the elements of type (b) provide a connection between the other two types.
The most complex system is the protrusion mechanism found in the jaw of the sand eel, Ammodytes tabianus, which consists of a bilateral series of six four-bar linkages. The most spectacular is the four-bar jaw mechanism of the angler fish, Lophius (fig. 8). 8. The opening mechanism of the mouth of the angler fish, Lophius, showing the underlying 4-bar mechanism (Muller, 1996). The proboscis (feeding tube) of Lepidoptera (butterflies and moths) is normally stored as a coiled structure beneath the head of the insect.
23(a). 23(b) shows a foldable module consisting of six rods, forming three pairs, connected by spherical joints at the ends. This basic module can be folded and deployed freely: its configuration is defined by the single parameter B. If several modules are stacked on top of one another, the parameter () has the same value for all modules to fit together. Hence, the entire pantograph has only one mechanism. This means that the whole structure deploys synchronously. 24 shows the deployment sequence of a deployable mast, consisting of five bays, based on this concept.