Abstract: The teen-sized humanoid robot "Archie" is developed by the Intelligent Handling and Robotics Department (IHRT) at the Technical University of Vienna. The main idea behind “Archie” is to develop a Cost Oriented Humanoid Robot (COHR) to assist humans in their daily life tasks. Currently, the robot consists of 18 degrees of freedom and is able to perform basic human-like walking motions. According to the scope of TECIS this robot is an excellent example for “Cost Orientation”. Until now the control of the joints was carried out by industrial controllers. These are expensive, heavy and have only limited possibilities for the implementation of advanced control algorithms. Therefore a new hard- and software control concept for the motors and the joints was developed. In order to find appropriate controller parameters the dynamic behavior of the joints is analyzed by means of a nonlinear system identification using a Hammerstein model. The result of the system identification shows that the dynamic behavior of the joints is PT1 element with two nonlinearities, a dead zone and a nonlinear gain. Therefore a “piecewise linear” PI controller – the gain depends from the velocity – will be implemented on a COA processor. Finally an outlook on further works will be described.
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