• Closed-form position analysis of variable geometry trusses 

      Porta Pleite, Josep Maria; Thomas, Federico (2017-03-01)
      Article
      Accés obert
      Variable geometry trusses are composed, in general, of unit cells which can be modeled as bars connected by spherical joints. Under mild conditions, it has been shown that the only feasible cells are topologically equivalent ...
    • Closed-form solution to the position analysis of Watt–Baranov trusses using the bilateration method 

      Rojas Libreros, Nicolás Enrique; Thomas, Federico (ASME PRESS, 2011)
      Article
      Accés restringit per política de l'editorial
      The exact position analysis of a planar mechanism reduces to compute the roots of its characteristic polynomial. Obtaining this polynomial almost invariably involves, as a first step, obtaining a system of equations derived ...
    • Distance-based position analysis of the three seven-link Assur kinematic chains 

      Rojas Libreros, Nicolás Enrique; Thomas, Federico (2011-02)
      Article
      Accés obert
      The position analysis of planar linkages has been dominated by resultant elimination and tangent-half-angle substitution techniques applied to sets of kinematic loop equations. This analysis is thus reduced to finding ...
    • Forward kinematics of the general triple-arm robot using a distance-based formulation 

      Rojas, Nicolas; Thomas, Federico (Springer, 2017)
      Text en actes de congrés
      Accés obert
      Distance-based formulations have successfully been used to obtain closure polynomialsfor planar mechanisms without relying, in most cases, on variable eliminations. The methods re-sulting from previous attempts to generalize ...