Advances in Smart Technologies in Structural Engineering by Fabio Casciati, Roberto Rossi (auth.), Prof. Dr. Jan

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

This ebook collects invited lectures awarded 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 used to be prepared by means of the complicated fabrics and buildings (AMAS) Centre of Excellence on the Institute of primary Technological examine (IFTR) in Warsaw and ECCOMAS – the ecu group on Computational equipment in technologies and SMART-TECH Centre at IFTR. The aim of the workshop used to be to collect and consolidate the neighborhood of shrewdpermanent fabrics and buildings in Europe. The workshop application used to be grouped into the themes Structural keep an eye on, Vibration keep an eye on and Dynamics, harm id, and clever Materials.

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If the measurement of the actual friction forces turns out to be difficult, the Kalman estimator can be extended by an integrator model [15] to estimate the friction forces, as well. 6 Simulation Results The simulation results in this section will show the potential of the proposed semi-active approach to vibration suppression. The boundary conditions and Semi-Active Friction Damping 39 disturbance (impulse force with an amplitude of 200 N over a time period of 40 ms) are the same as described in the previous Sect.

T (18) 1, defined by means of the eigenvalues of the controllability and observability and w~; respectively. Modes grarnians for the input u and output v, i. , with large Hankel :singular values /uv, should be included into the reduced model in order to guarantee a good approximation of the original system. Those modes will mainly be excited by the friction forces. And they will contribute to the sliding velocities v occuring in the friction joints, as well. In addition, all modes which have an impact on the system measurements y need to be added to the reduced model.

However high is the energy absorption capacity of such elements, they still remain highly redundant structural members, which do not carry any load in the actual operation of a given structure. In addition, passive energy absorbers are designed to work effectively in pre-defined impact scenarios. For example, the frontal honeycomb cushions are very effective during a symmetric axial crash of colliding cars, but are completely useless in other types of crash loading. Consequently, distinct and sometimes completely independent systems must be developed for specific collision scenarios.

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