Theoretical And Experimental Study On Vibration Control Of Cable

Cables are light, flexible, and low-damped and hence prone to have transverse vibration due to winds or support motions. If cables are long, control of such vibration by the conventional passive or semi-active dampers that are placed near the cable anchorage is very difficult. Active control at the boundary, i.e., cables anchorage, is an attractive approach.This dissertation, supported by the Natural Science Foundation of China for Distinguished Young Scholars (No.502?5825), is concerned with the vibration axial active control of flexible taut cables, small-sag cables and rigid cables. Simulation analysis and experiment are carried out, including as follows:1. Based on lots of documentation, conception of structural vibration control is introduced systematically. Review of the research is given, on vibration and vibration control of cables. Considering their vibration characteristics, cables are divided as taut cables, small-sag cables and rigid cables.2. In order to control the vibration of flexible taut cables, small-sag cables and rigid cables, single modal and multi-modal models of axial active control are established through modal reduction theory and Lagrange equation. The support displacement is responsible for axial active control force on cables.3. Based on active control model of cables vibration, single modal and multi-modal controls under different load case are realized through linear quadratic optimal control strategy. Active control efficiency of three kinds of cables are discussed, including flexible taut cables, small-sag cables and rigid cables.4. Parametric analysis of vibration control system for flexible taut cables is conducted. The influences on vibration control are discussed due to the changes of weighted parameters and external drive. Applicable criterion of optimal active control force and iterative computing method are given, in order to improve design efficiency of the controller.