Research On Adaptive Control Algorithm Based On Acceleration Feedback

With the gradual improvement of Chinese economic,large structures such as highrise buildings,long-span bridges and large stadiums and stations merged,brought great convenience to people’s production and life.The massive use of new lightweight materials reduces the stiffness of the structure,which also makes the phenomenon of structural damage caused by vibration increasingly more seriously.In order to reduce the damage to the building structure caused by vibration,structure vibration control technology had been successfully applied in many complex structures.For having extensive adaptability and good damping effect,the active control technology had received extensive attention and research from scholars.In the active control of civil engineering filed,the control algorithm directly related to the stability and the effect of the control,is the core content of the active control.Therefore,the active control algorithm is one of the most important research direction in the field of civil engineering.The adaptive control algorithm can continuously self-adjust in the control process,has been widely used in the fields of aerospace,mechanical automation production and automobile manufacturing.As the earliest proposed adaptive control algorithm,the Minimum Control Synthesis(MCS)algorithm has a good control effect on non-linear structures,which means it’s very suitable for civil engineering structures.In view of the problem that the full state of the system during vibration control of complex civil engineering structures is difficult to directly obtained,this paper studies the active control algorithm of acceleration feedback,and proposes a MCS adaptive control method based on acceleration feedback and optimizes it,then verified the control effect of the algorithm on the Shake Table Ⅱ standard shake table.The main contents of this article are as follows:(1)Based on the principle of structural dynamics,derived the acceleration output state space equation of the MIMO controlled system.Then integrated the MCS algorithm and state observer theory to proposes an adaptive control scheme based on the acceleration feedback.(2)Taking a two-layer frame structure as the research object,using the AMD device as the active controller,the adaptive control algorithm with acceleration as the feedback variable was investigated,and compared its control effect with the common optimal control.(3)For the problem of portion poor control effect of the standard MCS algorithm founded in simulation,fuzzy algorithm was introduced to optimize the empirical parameters in the MCS algorithm,and the simulation verified this acceleration feedback fuzzy-MCS algorithm has better control effect on both linear and non-linear system.(4)A two-layer frame AMD control system was established on the Shake TableⅡ standard shake table.The active vibration reduction control experiment verified the feasibility of the adaptive algorithm and the control effect of MCS algorithm and fuzzyMCS algorithm under various signal interferences,which exist in the actual structure,had been analyzed.