INTEC   05402
INSTITUTO DE DESARROLLO TECNOLOGICO PARA LA INDUSTRIA QUIMICA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Synthesis of Planar Multi-loop Linkages Starting from Existing Parts or Mechanisms: Enumeration and Initial Sizing
Autor/es:
MARTÍN A. PUCHETA; ALBERTO CARDONA
Lugar:
San Juan (Argentina)
Reunión:
Simposio; International Symposium on Multibody Systems and Mechatronics, MuSMe 2008; 2008
Institución organizadora:
Instituto de Mecánica Aplicada de la Universidad Nacional de San Juan
Resumen:
In this paper we present a methodology for dealing with mechanism synthesis problems in which there are initial existing parts connected arbitrarily (or even eventually disconnected). We use: (i) a Finite Element Method-like description of the initial kinematics problem; (ii) a graph representation to solve the number synthesis problem enumerating a finite number of feasible non-isomorphic topologies; (iii) a well-known analytical approach based on the Precision-Point Method to solve the initial dimensions of the linkages, (iv) a Genetic Algorithm for sweeping the design variables, if they exist in the previous step, (v) a weighted criteria for evaluating the generated alternatives. A preliminary analysis of the structural parts links and their types, joints and their types, and their connectivity in conjunction with the imposed motion constraints is considered just after the initial description. In this pre-processing stage, those parts with known dimensions are kinematically analyzed in order to obtain their displacements and rotations for a number of precision positions or pseudo-times. The proposed method allows the user to design mechanisms starting either from some parts, or from an existing mechanism, to develop additional kinematic tasks. A non standard example for function generation is illustrated throughout the paper. The method was implemented in C++ language under the object oriented environment of Oofelie.