Market-Based Control Algorithm Applied In Structural Control

Structural control has rapidly matured over the past decade into a viable means of limiting structural response under strong winds and earthquakes. In the past decade, new and promising control systems have been designed and implemented to limit structural responses during strong wind and earthquake loads. With small energy consumption characteristics, semi-active devices are an especially attractive solution for limiting earthquake deflections. Semi-active control device, due to its cheapness, low energy-consuming and control stability, has been focused on in the field of structural control of Civil Engineering. Such trend certainly will engender complex control systems with plenty of semi-active devices, which call for efficient control stratagem, decentralized or distributed control. Furthermore, Market-based control (MBC) decentralizes the complex system with market model as a tool in such a way that control devices and energy sources are respectively represented as consumers and manufactories in the market. Thereby price leverage will rationally distribute limited control energy among decentralized agents. Correspondingly, the structure vibration will be controlled under such strategy. This thesis focus on the structural vibration control using MBC approach and the main contents are abstracted as followed.(1) State of arts research of the Market-based Control has been reviewed, especially in the endeavor of Civil Engineering. Originating from free market economy, the mechanism of market has been paid attention to by both economists and engineers. The key points in the application of this approach in the engineering field are summarized.(2) In this thesis, MBC algorithm is realized basing on Matlab/Simulink software platform. Mathematical model is selected first, and modal parameter analysis is carried out to give deep observation on the behavior of the market simulating control system. In order to achieve good control effect, Generic Algorithm is adopted to solve such a complex problem with some many parameters. The optimization results show that MBC algorithm could control the vibration effectively.(3) An advance MBC approach is developed as to eccentric structural vibration control. Due to multiple control requirements of spatial vibration resulting from coupled translation and torsion response, an improved MBC approach is derived that it models such a structural control system as a marketplace with multi-commodity. Different commodity indicates the different control demand of the distributed structure. A 6-story structure, with MR damperslaid in two level directions in every story, is analyzed. The results show that spatial vibration of the structure can be effectively suppressed by AMBC approach employing MR damper.(4) Combining with MR damper, Advanced Market-based Control approach (AMBC) is presented to control the wind-induced vibration of eccentric structure in time-domain in distributed manner. First, fluctuating wind is simulated based on the harmonic wave superimposing method considering the space coherence. Then compare between control solution of MBC and LQR is proceeded to justify the distinct advantage of AMBC, robustness qualities with respect to actuation failures in the control system.