LEP has proved to be one of the most flexible ee colliders built to date. It has operated at various energies, in several modes, with everincreasing demands for luminosity in clean and precisely known beam conditions. Together with some unique features, LEP therefore has much in common with future ee factories. Beam-dynamical phenomena have been among the crucial determinants of LEP’s performan...

The active vibration suppression of a flexible link manipulator using a smart structure (piezoelectric actuator) is investigated. For this purpose, a Finite Element (FE) model is developed for the modal and transient analysis of a cantilever beam and a flexible link manipulator. The novelty of this work is in the development of an accurate finite element model of a piezoelectric and beam/manipu...

Finite element stiffness and consistent mass matrices are derived for helically wound, symmetrical composite tubes. The tubular element is considered to have constant cross-section and small deformations restricted to a plane. Each node has three degrees of freedom: axial and transverse displacement and rotation (slope of transverse displacement). Shell theory and lamination theory are used to ...