We present numerical simulations of vibrations of an elastic beam between two stops. The beam is clamped at one end to a vibrating device; the motion of the other end is restricted by two stops. The contact is modeled by the normal compliance condition which describes nonlinear flexible stops, and approximates the Signorini condition for rigid stops. We propose a finite element method for the n...

A design method for a feedback controller with integrated delay-based command shaper is presented in this paper, based on the Smith predictor concept. PosiCast and related input command shapers (ZV, ZVD, EI etc.) are primarily intended as feedforward filters for reference (set point) signals. Nevertheless, due to their superior effectiveness in suppressing vibrations, there is a good motivation...

This paper presented multi-objective optimization of tip tracking control for non-collocated flexible beam. The desired trajectory is specified at the tip displacement of the flexible structure, which undergoes translation base motion actuated by a linear motor. The system model is first formulated from modal truncation approach for the flexible structure representing a single Cartesian robot m...

A metre-length flexible hollow glass fibre with 20 µm-bore and 1.5 mm-cladding diameters for transporting a synchrotron X-ray beam and controlling the trajectory has been examined. The large cladding diameter maintains a moderate curvature to satisfy the shallow glancing angle of total reflection. The observed transmission efficiency was more than 20% at 12.4 keV. As a demonstration, a wide-are...

Abstract— This note deals with the stabilization problem of a rotating disk with a flexible beam attached to its center. Assuming that a torque control is applied on the disk and a shear force control is exerted at the free end of the beam, we end up with a nondissipative closed loop system. We prove that the system can be nonuniformly exponentially stabilized provided that the angular velocity...

Recent investigations have shown that the influences of Soil-Structure Interaction (SSI) may be detrimental to the seismic response of structure, and hence neglecting this phenomenon in analysis and design may lead to an un-conservative design. The objective of this paper is to quantify the effects of nonlinear soil-structure interaction on the seismic response of a low-rise special moment fram...