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2 2012

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Stable gait synthesis and analysis of a 12 - degree of freedom eiped robot in sagittal and frontal planes

Sudheer A. P., Vijayakumar R., Mohandas K. P.

Journal of Automation Mobile Robotics and Intelligent Systems

2012

Vol. 6, No. 4

36-44

Legged machines have not been offered biologically realistic movement patterns and behaviours due to the limitations in kinematic, dynamics and control technique. When the degrees of freedom (DOF) increases, the robot becomes complex and it affects the postural stability. A loss of postural stability of biped may have potentially serious consequences and this demands thorough analysis for the better prediction and elimination of the possibility of fall. This work presents the modelling and simulation of twelve degrees of freedom (DOF) biped robot, walking along a pre-defined trajectory after considering the stability in sagittal and frontal planes based upon zero moment point (ZMP) criterion. Kinematic modelling and dynamic modelling of the robot are done using Denavit-Hartenberg (DH) parameters and Newton-Euler algorithm respectively. This paper also proposes Levenberg- Marquardt method for finding inverse kinematic solutions and determines the size of the foot based on ZMP for the stable motion of biped. Biped robot locomotion is simulated, kinematic and dynamic parameters are plotted using MATLAB. Cycloidal gait trajectory is experimentally validated for a particular step length of the biped.

A study on simulation model and kinematic model of welding robot

Jeong J. W., Kim I. S., Chand R. R., Lee J. H.

Journal of Achievements in Materials and Manufacturing Engineering

2012

Vol. 55, nr 1

66--73

Purpose: This study tries to develop a simulation model of six degree freedom for Faraman AM1 welding robot using CATIA V5 and compares with the computed kinematic model for robotic welding. The error varification of simulated model and kinematics of the robot is also being carried out. Design/methodology/approach: CATIA (Computer Aided Three dimensional Interactive Application) is a multi-platform PLM/CAD/CAM/CAE commercial software suite to use to develop six degree freedom for Faraman AM1 welding robot. The forward kinematic and inverse kinematic equations are also used to verify the developed model. Findings: The results obtained from the six degree freedom for Faraman AM1 simulated model has a good agreement with computed kinematic models equations. The catia V5 a very powerful tool which could used in develope a simulation for robotic welding system. The the angle error between simulated model and computed inverse kinmenatic equation obtained too very small. Research limitations/implications: The developed simulated in Catia is mainly aimed to be used in GMA welding process. D-H (Denavit-Hartenberg) convection is used to determine the orthonormal coordinate frames at different joints of a robotic manipulator and determining four kinematic parameters. Originality/value: The six degree freedom for Faraman AM1 welding robot is model to analysed and compared with forward and inverse knimatic.