For optimizing the dynamic behaviour of a mechanical system and improving its shape stability, it is first necessary to develop a sufficiently exact model of the system, This results in a "computation model" using analytical means which, however,is still inaccurate since the boundary and interface conditions are not sufficiently known. The result of experimental identification is a measure model" which is more realistic but has the disadvantage that system behaviour is described precisely only at the measurement points in the respective measuring direction. An optimum model" is obtained from combining measurement and computation. This is the basis for system modifications such as design changes and the usage of passive damper elements. Theapplication of active correcting elements for the vibration and shape influence has been increasingly under investigation. Adaptive qualities of the mechanical systems should be achieved by inclusion of suitable control algorithms.In the A{sub}(DAMES) project, a ribbed plate of cast aluminium is used as a test structure for modelling, optimization and identification. It is the aim of the investigations to influence the plate's dynamic behaviour and its shape stability bypurposefully integrating discrete piezoactuators.Results of identification and computation of the passive mechanical structure under different boundary conditions are presented. Starting with the finite element model derived from the measuring and computation models of the plate. Procedures are examined to determine both the optimum number and position of the actuators and the optimum controller parameter. First, the applicability of the actuators and sensors used are demonstrated for a selected control algorithm in simulations. Some results ofexperimental investigations of the static and dynamic behaviour of the ribbed plate are presented for the case of active influence and are compared with the simulated values.
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