| Mechanical and Civil Engineering |
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| Analysis and optimal synthesis of single loop spatial mechanisms |
| Med Amine Laribi, Lotfi Romdhane, Sa?d Zeghloul |
| Laboratoire de Génie Mécanique, LAB-MA-05, Ecole Nationale d’Ingénieurs de Sousse, 4000 Sousse, Tunisia, Institut Pprime-UPR 3346, CNRS-Université de Poitiers-ENSMA, Département Génie Mécanique et Systémes Complexes, SP2MI, BP30179 86962 Futuroscope, France |
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Abstract In this work, a systematic approach is presented to obtain the input-output equations of a single loop 4-bar spatial mechanisms. The dialytic method along with Denavit-Hartenberg parameters can be used to obtain these equations efficiently. A genetic algorithm (GA) has been used to solve the problem of spatial mechanisms synthesis. Two types of mechanisms, e.g., RSCR and RSPC (R: revolute; S: spherical; C: cylindrical; P: prismatic), have illustrated the application of the GA to solve the problem of function generation and path generation. In some cases, the GA method becomes trapped in a local minimum. A combined GA-fuzzy logic (GA-FL) method is then used to improve the final result. The results show that GAs, combined with an adequate description of the mechanism, are well suited for spatial mechanism synthesis problems and have neither difficulties inherent to the choice of the initial feasible guess, nor a problem of convergence, as it is the case for deterministic methods.
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Received: 02 February 2010
Published: 06 June 2011
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