This work presents the application of Euler-Lagrange formulation in dynamics modelling of the quadruped robot leg mechanism, and a comparison of performance between these models with experimental results using a leg prototype. In this formulation, the effects of C(q,dq/dt) and G(q), matrices representing centrifugal and Coriolis forces and gravitational torques, are analyzed. A possible simplification in the Euler-Lagrange formulation is studied concerning the modelling of leg mechanism. This simplification is discussed considering the links mass, and the linear and angular speeds that the leg executes during the walk. The goal is to propose a simplified dynamic model based on the Euler-Lagrange formulation for small quadruped robots. The results obtained by numerical simulations, with and without C(q,dq/dt) and G(q) considered in the model, show similar performances. A comparison and analysis of the simulations results and experimental results close the paper.
Walking robots; mobile robotics; dynamics modelling
