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 e-book collects invited lectures awarded on the AMAS & ECCOMAS Workshop/Thematic convention SMART’03 on shrewdpermanent fabrics and buildings. The convention was once held in Jadwisin, Poland close to Warsaw, 2-5 September 2003. It was once geared up through the complicated fabrics and constructions (AMAS) Centre of Excellence on the Institute of primary Technological examine (IFTR) in Warsaw and ECCOMAS – the ecu group on Computational tools 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 software used to be grouped into the subjects Structural keep watch over, Vibration regulate and Dynamics, harm id, and clever Materials.

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However, passive approaches for vibration suppression are by far not as effective as active ones. Passive friction damping has several disadvantages. When the amplitude of vibration decreases below a certain level sticking occurs and energy is no longer dissipated. In addition, if the stiction force is J. Holnicki-Szulc et al. ), Advances in Smart Technologies in Structural Engineering © Springer-Verlag Berlin Heidelberg 2004 26 Lothar Gaul et al. quite high the connected parts can stick and thus static shape accuracy cannot be assured.

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. 2 . l stack actuator , the pressure in the contact area. can be altered. The normal force is approximately proportional to the applied voltage.

Due to their small damping and the stringent positioning accuracy, many missions involving antennas or optical interferometers require vibration suppression. Numerous works have been published on active vibration suppression. Usually piezoelectric stacks are used as devices for actuators because of their light weight, high force and minimum power consumption. Although an active approach is very attractive, actively controlled systems may cause spillover instability. Passive approaches for damping enhancement involving visco-elastic materials or preloaded backlashes [1] may be desirable because of their simplicity and low cost.

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