Optimal Clipped Linear Strategies for Controllable Damping

摘要：

　　Over the past several decades,structural control has focused mostly on purely passive and controllable passive strategies.Among the latter,the clipped-optimal control paradigm 1 is one of the most commonly used.However,the optimization to design the optimal control law cannot consider the inherent passivity constraints of controllable dampers,which can result in commanded forces that are frequently non-dissipative for some structures and some performance objectives,causing frequent clipping; the result effectively deactivates the controllable damper for most of the time history.Therefore,the authors have proposed an alternate optimal clipped linear control(OCLC)strategy and demonstrated,in simulation,that it provides performance superior to a standard clipped-LQR(CLQR)approach for a single degree-of-freedom(SDOF)structural model,especially in the cases where CLQR generates frequent clipping.Herein,the relationship between the structural parameters and the structure response metrics using CLQR and OCLC strategies for a 2DOF system with one control device is studied.The control laws are functions of the four states,resulting in a four-dimensional optimization problem(that cannot be illustrated graphically in a direct manner,but only through surface graphs that are slices through the full control law space).With a Gaussian white noise ground acceleration,the CLQR and OCLC strategies are compared with each other and with an optimal passive linear viscous damper.The results show that a performance metric using CLQR is about double that with OCLC,even though OCLC uses less control effort; further,CLQR is even worse than the passive strategy.In all,OCLC is the best control strategy for a specified objective function for this 2DOF numerical model.

关键词： controllable damping optimization nonlinear control structural control

作者: Q.Fang E.A.Johnson P.T.Brewick S.F.Wojtkiewicz

作者单位: Sonny Astani Dept.of Civil and Env.Engineering,University of Southern California,Los Angeles,CA,USA Sonny Astani Dept.of Civil and Env.Engineering,University of Southern California,Los Angeles,CA,USA; Dept.of Civil Engineering,Clarkson University,Potsdam,NY,USA

会议类型: 国际会议

会议名称: The 7th World Conference on Structural Control and Monitoring(7WCSCM)(第七届结构控制与监测世界大会)

会议地点: 青岛

会议语种:英文

页码: 845-852

在线出版日期: 2018-07-22（万方平台首次上网日期，不代表论文的发表时间）