Dynamics and control in precision mechanics

Abstract

This paper briefly describes three projects developed at the Active Structures Laboratory of ULB, in connection with precision mechanics. The first one considers the integration of piezoelectric fibers in composite structures for space applications; the second consists of an active piezoelectric bimorph mirror for adaptive optics, and the third considers the vibration isolation of sensitive payloads in spacecraft.

Frictional Slip and Incremental Dynamic Analysis of Plate-rubber Bearing Continuous Girder Bridge by Ambient Temperature in Cold Region

“…and then the displacement ductility ratio of abutments can be calculated based on the plastic hinge theory. According to the above specification content, while referring to the literature [25][26][27], the ratio µ2 of the allowable relative displacement of each limit state support to the relative displacement at shear strain y = 100% is used to determine its corresponding 4 damage states, i.e. : According to the definition of the bearing damage state obtained support at −40 • C when the damage index; through the support in the hightemperature displacement response calculation found that the support in 40 • C displacement value compared to room temperature increased by 19.4%, so according to the definition of the bearing damage state, the support in 40 • C when the damage index.…”