By Fabio Casciati, Roberto Rossi (auth.), Prof. Dr. Jan Holnicki-Szulc, Prof. Dr. Carlos Mota Soares (eds.)
This e-book collects invited lectures provided on the AMAS & ECCOMAS Workshop/Thematic convention SMART’03 on shrewdpermanent fabrics and constructions. The convention used to be held in Jadwisin, Poland close to Warsaw, 2-5 September 2003. It was once geared up through the complex fabrics and buildings (AMAS) Centre of Excellence on the Institute of primary Technological learn (IFTR) in Warsaw and ECCOMAS – the ecu group on Computational equipment in technologies and SMART-TECH Centre at IFTR. The aim of the workshop was once to collect and consolidate the group of clever fabrics and buildings in Europe. The workshop software was once grouped into the themes Structural keep watch over, Vibration regulate and Dynamics, harm id, and shrewdpermanent Materials.
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3, two types of joints are considered, each 1 For details visit the websites http: I lwww. j pl. nasa. htm and Semi-Active Friction Damping Fig. 1. Truss structure 27 Fig. 2. Meroform components with one single degree-of-freedom. It is the relative displacement along the longitudinal axis of the connected rod (type A) and relative rotation about an axis perpendicular to the longitudinal axis (type B) . A sketch of the rotational prototype (type B) is shown in Fig. 4. The semi-active joint employs the dissipative character of dry friction caused by interfacial slip in the contact area.
Pnl (including n < N 'significant' eigenmodes 4>;) obtained from the undamped eigenvalue problem i=l , ... ,n (7) and assuming proportional damping , (5) can be transformed to a set of differential equations Semi-Active Friction Damping 31 with the matrices fl = diag (wf), B = diag (2~; w;) and the vector "1 of modal coordinates 7]; . The eigenfrequency and the modal damping coefficient of the i-th mode is denoted by w; and~;, respectively. T he sliding velocities v and additional measurements y are given by v = E T ci>iJ y = VcfJry (9) (10) + Wci>iJ.
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.