By Fabio Casciati, Roberto Rossi (auth.), Prof. Dr. Jan Holnicki-Szulc, Prof. Dr. Carlos Mota Soares (eds.)

This booklet collects invited lectures offered on the AMAS & ECCOMAS Workshop/Thematic convention SMART’03 on shrewdpermanent fabrics and buildings. The convention used to be held in Jadwisin, Poland close to Warsaw, 2-5 September 2003. It was once equipped by means of the complicated fabrics and constructions (AMAS) Centre of Excellence on the Institute of basic Technological study (IFTR) in Warsaw and ECCOMAS – the ecu group on Computational tools in technologies and SMART-TECH Centre at IFTR. The target of the workshop used to be to compile and consolidate the neighborhood of shrewdpermanent fabrics and constructions in Europe. The workshop application used to be grouped into the subjects Structural keep an eye on, Vibration keep an eye on and Dynamics, harm id, and shrewdpermanent Materials.

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Un between the tied dofs Urn and the independent dofs Un. The mass and inertia of the Meroform connections are lumped at the centers of each truss node. The kinematics of the friction joints are described by 30 Lothar Gaul et al. ------, . A1n 4 m]o. :: 0 - ~~~ . --~ . ~---,_ . :: : -+ --. 4 .... J2 relative angle [rad] X 10 relative angle [rad] Fig. 5. Hysteresis loops for type B: simulation ( - ) , experiment (--) constraint matrices, as well, which couple the degrees of freedom of the corresponding nodes according to the type of joint.

7c). Fig. 7d) (semi-active adaptation in real time) allows extension of the structural impact capacity up to above 203% (com- Design of Adaptive Structures under Random Impact Conditions 59 paring with S 1 substructure capacity) and the corresponding impact velocity, as the inclined members will still continue process of dissipation. The crucial points in the proposed methodology are: • • development of technique for detection and identification of the impact in advance, dEwelopment of devices for quickly responding, controlled in real time, semi-active detachment of struetmal members and for introducing initial distortions.

Furthermore, this concept can easily be employed without increasing the structural weight. The paper is structured as follows. It starts with the numerical model of the adaptive structure consisting of the truss structure which is considered as a linear subsystem and the nonlinear semi-active joints which exert statedependent friction forces on the linear subsystem. The parameters of the nonlinear friction model must be identified from measurements conducted with an isolated joint. Based on the open-loop state space model of the linear subsystem, modal reduction is performed using controllability and observability gramians.

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