Sergio Pellegrino

Learn More
Seven form-finding methods for tensegrity structures are reviewed and classified. The three kinematical methods include an analytical approach, a non-linear optimisation, and a pseudo-dynamic iteration. The four statical methods include an analytical method, the formulation of linear equations of equilibrium in terms of force densities, an energy(More)
Encapsulated vitro-derived apical buds of M.26 apple rootstock (Malus pumila Mill) can be employed for the formation of the synthetic seed. Satisfactory levels of conversion (plantlets from synthetic seed) can be achieved if there are adequate (i) rooting induction treatment, (ii) protocol of encapsulation, and (iii) nutritive and environmental conditions.(More)
This paper presents a concept for a multi-aperture space telescope built up of autonomous reconfigurable spacecraft elements which, when docked together, can synthesise a large aperture through the use of adaptive optics. The eventual aim is to develop telescopes with apertures exceeding 20m, and thus to move on a generation from the James Webb Space(More)
Future space telescopes with diameter over 20 m will require in-space assembly. High-precision formation flying has very high cost and may not be able to maintain stable alignment over long periods of time. We believe autonomous assembly is a key enabler for a lower cost approach to large space telescopes. To gain experience, and to provide risk reduction,(More)
This report presents a study of a recently proposed low-cost hinge for deployable spacecraft appendages. The hinge consists of one or more pairs of steel carpenter tapes (tape springs) connected to a rolling hinge made from plastic " wheels " connected by steel cables (Rolamite). This hinge is known as Tape-Spring Rolamite (TSR) hinge. The report includes:(More)
This paper presents the use of origami technique to construct a 3D spherical structure from a 2D parylene-C (PA-C) film with designed folding crease patterns. This origami technique is developed or intended for intraocular epiretinal implant application, which requires a “curved” electrode array to match the curvature of the macula. The folding method and(More)
This paper is concerned with self-powered, self-latching tube hinges, made by cutting three parallel slots in a thin-walled carbon fiber reinforced plastic tube with a circular cross section. Thus, a hinge consists of two short tubes connected by three transversally curved strips of material known as tape springs . A particular tube hinge design is(More)
This is the third and final part of a study of wrinkles in thin membrane structures. High-fidelity, geometrically nonlinear finite element models of membrane structures , based on thin-shell elements, are used to simulate the onset and growth of wrinkles. The simulations are carried out with the ABAQUS finite element package. The accuracy of the results is(More)
This paper is concerned with beamlike space frames that include a large number of bistable elements, and exploit the bistability of the elements to obtain structures with multiple stable configurations. By increasing the number of bistable elements, structures with a large number of different configurations can be designed. A particular attraction of this(More)