Documents published in Scipedia

• Design of a Remote Monitoring System for High Speed Craft

  J. Lozano, J. Corbera, X. Osés

  Journal of navigation (2000). Vol. 53 (3), pp. 465-471

  
  

  Abstract

  At present, the whole shipping industry is concerned about safety of navigation. In particular, attention is focused on High Speed Craft. There has been a sharp increase in numbers of this kind of vessel, which primarily carries passengers but is also known to carry goods. Some units can reach speeds of over 45 knots with capacity for 900 passengers. These passengers have a basic right to life and their means of transport should obviously follow all safety codes, regulations and IMO resolutions. This paper describes the development of a monitoring system that could automatically transmit safety parameters and position from the ship to a management control centre. Digital and analogical alarms, ship condition readings and other safety-related parameters may be recorded and transmitted in near real- time using the latest communications and positioning technologies.  

  Abstract
  At present, the whole shipping industry is concerned about safety of navigation. In particular, attention is focused on High Speed Craft. There has been a sharp increase [...]

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• Preface: Thematic issue on multibody dynamics 2015

  J. Font-Llagunes, J. Muñoz, J. Ambrósio

  Multibody System Dynamics (2017). Vol. 39 (1), pp. 1-2

  
  

  Abstract

  Multibody system dynamics is a branch of computational mechanics that deals with modeling principles and computational methods for the dynamic analysis, simulation, and control of complex mechanical systems. These appear in a large spectrum of domains ranging, for example, from standard industrial production of vehicles, rotational machines and mechatronic devices to emerging application fields where biomolecular structures and smart materials are studied at the nanodimensional level. Such versatility of applications is rooted in the basic modeling principles of the discipline, which, being based on the kinematical and dynamical coupling of rigid and flexible bodies with different characteristics and mechanical properties, serve as a powerful tool to study the mechanical and multiphysics behavior of a broad class of systems in engineering and applied sciences.

  Abstract
  Multibody system dynamics is a branch of computational mechanics that deals with modeling principles and computational methods for the dynamic analysis, simulation, and [...]

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• An immersed boundary hierarchical B-spline method for flexoelectricity

  D. Codony, O. Marcos, S. Fernández-Méndez, I. Arias

  Computer Methods in Applied Mechanics and Engineering (2019). Vol. 354, pp. 750-782 (Preprint)

  
  

  Abstract

  This paper develops a computational framework with unfitted meshes to solve linear piezoelectricity and flexoelectricity electromechanical boundary value problems including strain gradient elasticity at infinitesimal strains. The high-order nature of the coupled PDE system is addressed by a sufficiently smooth hierarchical B-spline approximation on a background Cartesian mesh. The domain of interest is embedded into the background mesh and discretized in an unfitted fashion. The immersed boundary approach allows us to use B-splines on arbitrary domain shapes, regardless of their geometrical complexity, and could be directly extended, for instance, to shape and topology optimization. The domain boundary is represented by NURBS, and exactly integrated by means of the NEFEM mapping. Local adaptivity is achieved by hierarchical refinement of B-spline basis, which are efficiently evaluated and integrated thanks to their piecewise polynomial definition. Nitsche’s formulation is derived to weakly enforce essential boundary conditions, accounting also for the non-local conditions on the non-smooth portions of the domain boundary (i.e. edges in 3D or corners in 2D) arising from Mindlin’s strain gradient elasticity theory. Boundary conditions modeling sensing electrodes are formulated and enforced following the same approach. Optimal error convergence rates are reported using high-order B-spline approximations. The method is verified against available analytical solutions and well-known benchmarks from the literature.

  Abstract
  This paper develops a computational framework with unfitted meshes to solve linear piezoelectricity and flexoelectricity electromechanical boundary value problems including [...]

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