Transient Simulation of Adaptive Structures

Abstract

Abstract An approach is utilised to design an adaptronic system by means of Rapid-Prototyping on the basis of a simulation. The modelling of the vibration behaviour of mechanical systems with actuators and sensors and additionally an adaptive controller in time domain is presented. The method includes the calculation of the dynamic behaviour of the mechanical structure with the help of FEM. The FE-model of the mechanical structure is transformed into modal space, then reduced and embedded as state-space-model in the MATLAB/Simulink-environment. A comparison of an analytical solution with the solution of reduced FE-model shows good agreement (a simple mechanical structure is used). Actuators and sensors are appliqued to the mechanical structure. Based on the resulting dynamical behaviour of the mechanical structure an adaptive control algorithm for the reduction of structural vibrations is developed. Experimental tests are performed to confirm and to update the simulations. The hardware-in-the-loop-simulations are realized with a Dspace-system. Some aspects (e.g. speed-up, precision) of this simulation method in comparison with other methods are indicated. This procedure allows the development and the evaluation of more complex adaptive mechanical structures.