A methodology for the design of a models set of light-weight robots components
Wybrane pełne teksty z tego czasopisma
The paper gives an overview of precise mathematical modeling of light-weight robots components. Derived set of components contains dynamic models obtained with finite element method using Legendre polynomials and models of actuators (PWM power amplifiers), transmitters (harmonic drive and tooth-belt gearboxes) and sensors (PVDF, vision sensor and rotary encoder). The proposed gearboxes models taking into account such phenomena as: hysteresis, friction as well as torsional and longitudinal flexibility. The hysteresis has been modeled as weighted combination of individual Preisach cells to form a global operator. Friction model includes a lubricated contact force assuming dynamic behavior developed by Bliman and Sorine. The harmonic drive model describes the flexspline flexibility, that produces substantial transmission torsion. The original proposition assumes that the flexspline can be modeled as cylindrical shell FEM model based on 16 directional mesh. All analytical operations of process design stage have been done using the Maple symbolic language. The paper describes also the developed software which has been prepared as the dynamic library (C++/Cg) and as the s-function forms (for Matlab/Simulink). Both, the result of the theoretical analysis and the written software are used in ongoing research to develop variant of MRAC-type controllers for vibration cancelation.
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