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On the nonlinear dynamics of spatial cellular tensegrities
No full textIt has been shown in [1] and [2] that the nonlinear mechanical response of one-dimensional assemblies of tensegrity modules is characterized by the presence of solitary waves and other nonlinear phenomena. In [3], numerical experiments carried out on two-dimensional periodic assemblies of tensegrity cells revealed that such lattices also supports the propagation of solitary waves. Here we extend that study by considering three-dimensional periodic assemblies of tensegrity cells. These cells have polyhedral shape with cables outside and bars inside, and they are assembled together by suspending one bar of a cell on the cables of an adjacent cell, so as to realize lattices characterized by a stiffening static response. We first present an exploration of the possible spatial tessellations which can be obtained in this way. Afterward, we discuss the simulated dynamic behavior of selected assemblies.
References
[1] Fraternali, F., Carpentieri, G., Amendola, A., Skelton, R.E., and Nesterenko, V.F., “Multiscale tunability of solitary wave dynamics in tensegrity metamaterials”, Applied Physics Letters, Vol. 105, 201903 (2014).
[2] Davini,C.,Micheletti,A.,andPodio-Guidugli,P.,“OntheimpulsivedynamicsofT3tensegrity chains”, Meccanica, Vol. 51(11), pp. 2763-2776 (2016).
[3] Micheletti, A., Paris, V., Pizzigoni, A., Ruscica, G. “Nonlinear cellular tensegrity materials”, presented at 23rd AIMETA Congress, Salerno, Italy, September 4-7, 201
MICHELSON-LIKE INTERFEROMETER IN FLOWING AIR FOR MEASURING THE THERMAL EXPANSION COEFFICIENT OF AN OPTICAL TABLE
No full textA new facility for measuring three dimensional deformations of high dimensional stability structure
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Analysis and comparison of performance of two small-scale Trigeneration plants: an ICE with a liquid desiccant cooling system and a MGT with an absorption chiller
No full textTwo natural gas small-scale trigeneration plants are presented in the paper. Both plants are going to be started-up at the Politecnico di Torino (Turin, Italy) and are part of a new cogeneration and trigeneration systems laboratory, which is going to be setup and exploited for scientific and technical purposes. The first plant has 126/220/210 kW electrical, heating and cooling capacities, respectively, and is characterized by an innovative internal combustion engine that has been coupled to a liquid LiCl-water desiccant cooling system, which provides cooled and dehumidified air to a classroom building. The other plant has 100/145/98 kW electrical, heating and cooling capacities and is composed of a natural gas micro gas turbine, coupled to a LiBr-Water absorption chiller, which provides cooled water to the internal cooling grid at the Politecnico. The paper has the aim of comparing the performances of the two plants from an energetic and economic point of view; the Primary Energy Savings are calculated through different methodologies reported in literature for both installations, and the results are compared and discussed. A comparison of the economic performance offered by the two plants is also reported, together with a sensitivity analysis on the influence of subsidies foreseen by Italian Legislation on economic profitabilit
Modello del trasporto termico radiativo per schiume isolanti in presenza di condizioni al contorno asimmetriche
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