Decentralized algorithm for semi-active damping of forced vibrations using controllable truss-frame nodes
Semi-active systems for mitigation of vibrations proved to be effective in many applications.Their prominent advantage is that they combine strong points of passive and active damping systems.Proper design can ensure their reliability,which is what passive systems are praised for.A high effectiveness in vibration damping links them with active systems.At the same time they do not have many deficiencies of active systems.They are adaptive,so they can stay effective in different environmental conditions,which is the factor that eliminates passive systems from many implementations.Their mass and energy consumption is very low,and the controlled structure can stay in the safe configuration even in case of power supply failure,which puts them in contrast to many active systems.The mentioned attributes make them a good choice for many structures subjected to vibrations,especially when there is a strong emphasis on maximization of the efficiency/mass ratio of the damping system.This contribution presents a decentralized closed-loop control strategy and applies it in a frame structure equipped with controllable truss-frame nodes.Such nodes can be switched between frame-like and truss-like states in a controllable manner.In the frame-like state the node transmits all forces and moments,while in the truss-like state only axial and shearing forces are transmitted.These nodes allow for structural reconfiguration,which can be utilized by semi-active control strategies for the purpose of vibration damping.The implemented control algorithm applies the Prestress-Accumulation Release(PAR)strategy based on the transmission of the accumulated potential energy to high modes of vibration,which are highly dissipative.Strain measurements are conducted locally on selected elements.A similar strategy proved its effectiveness in mitigation of free structural vibrations.This research studies the concept of its application to mitigation of forced structural vibrations,caused by variable external conditions.
Semi-active damping Truss-frame nodes Prestress-Accumulation Release (PAR) Decentralized control
B.Poplawski G.Miku(l)owski A.Mroz (L).Jankowski
Institute of Fundamental Technological Research,Polish Academy of Sciences,Pawi(n)skiego 5B,02-106 W Adaptronica Sp.z o.o.,Szpitalna 32,05-092(L)omianki,Poland
国际会议
The 7th World Conference on Structural Control and Monitoring(7WCSCM)(第七届结构控制与监测世界大会)
青岛
英文
582-590
2018-07-22（万方平台首次上网日期，不代表论文的发表时间）