Cable Active Control Experiments Based On The Magnetostrictive Actuator

Cable of cable-stayed bridge has a light weight, large flexibility, smalldamp and low natural frequency, which leads to produce various kinds ofharmful vibration easily under external load. The continuous vibration of cablecan cause fatigue damage and corrosion of the cable. On cable vibration controlmethods are mainly aerodynamic improvement measures, auxiliary cablevibration, mechanical damping of vibration reduction and cable active control,etc. In this paper, magnetostrictive actuator is used to carry out active controlresearch in cable vibration. The giant magnetostrictive actuator based on giantmagnetostrictive material as the driving element has been applied in variousfields, which has the advantages of compact structure, large output, outputpower, rapid response, etc. This subject is funded by the National NaturalScience Foundation——The Magnetostrictive Actuator Cable-stayed ActiveControl Experimental and Theoretical Study (51078142). The magnetostrictiveactuator force-magnetic model and the cable active vibration control with thegiant magnetostrictive actuator have been carried out. The following is the maincontent of this paper.(1) Briefly discoursed the existing cable vibration control methods,established the equations of motion of cable-magnetostrictive actuator, thensolved the equations by using classical linear optimal control algorithm andBang-Bang control algorithm.(2) By using over-magnetization to improve the hysteresis, carried out themechanical experiments of giant magnetostrictive actuator and studied themagnetostrictive actuator and magnetic coupling function under differentprestressed.(3) Under Matlab-based simulation platform, studied the vibration controleffect in cable experimental model of single-mode and multi-modal (first threemodes) by using the classical linear optimal control algorithm. Proposed active control method using multi-level Bang-Bang control, and verified the effect ofthe control with simulation results.(4) Designed an experimental model of cable vibration control system,carried out compared control experiments under different loading conditions ofcontrolled and uncontrolled conditions with Bang-Bang control algorithm cableto assess the Bang-Bang control cable damping effect.