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Structural Vibration Control Using MBC Strategy

Posted on:2008-05-05Degree:MasterType:Thesis
Country:ChinaCandidate:Y LiFull Text:PDF
GTID:2132360278953474Subject:Disaster Prevention
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In the field of structural vibration control, control effects of the system depend on the control algorithm used in the controllers. Without a good control algorithm, it is difficult to make full use of the whole control system. In essence, structural control technology is to put the external control energy on the controlled structure by using control devices. Because of the particularity and complexity in structural vibration control, how to find out an optimal control algorithm suited for active or semi-active control to complete the distribution of control energy has become the most important work for scholars all over the world. The traditional classic optimal control algorithm could allocate the control energy appropriately and would also get a well control effect, but for it uses the full states of the controlled system the controller has to take a long time to deal with these large information and will slacken the control system's action speed. Market-Based control theory, which based on the non-classic information, tries to imitate the behavior of the liberal economy market to complete Pareto optimal allocation of the scarce control energy in control system, maximise the economy individuals' own utilities in the fictitious market and achieve effective control for the controlled system. This thesis focus on the MBC strategy used in structural vibration control and the main contents are abstracted as follows:(1) State-of-arts of the research of Market-Based control theory has been reviewed and the economics theory foundations of MBC strategy have been drawn out. Comparability of the action mechanism between structural vibration control system and liberal economy market has been summed up. For how to build an appropriate Supply-Demand function for the allocation structural control energy is the key to MBC strategy applied in structural control, some Supply-Demand function models are presented and analysed in this thesis. At the same time, some advanced Supply-Demand function models more suitable for structural vibration control have been presented.The stability of the controlled system is discussed for the first time and the method of how to select the coefficients in these models is given for the convenience of actual engineering application. The validity and superiority of the proposed models are validated by some numerical analysis for a 3-story active and a 20-story semi-active control structure.(2) A semi-active control strategy for smart base isolated system, which consists of magnetorheological dampers (MRD) and an array of elastic rubber isolators, using MBC strategy have been proposed to actualize effective control of MRD's voltage. A 5-story and the Benchmark semi-active isolation structures have been used to verify the strategy's validity. And numerical simulation results have shown that the proposed scheme could disengage the dependence from the overall state information of the structure, and can significantly reduce the response of the controlled structure while making the best use of the MRD's variable-damp characteristic.(3) The necessity of decentralized control strategy used in vibration control of high-rise building has been expatiated. And several decentralized control algorithms are summarized with a new decentralized control algorithm—Multi-market-Based Control (MMBC) algorithm proposed. A 20-story analytical structure is used for comparing the performance of the two control strategies considered. The results indicate that both of them can effectively mitigate structure vibration. But compared with the centralized control strategy, the decentralized control strategy has an advantage at decentralized collection and disposal for the control information and is superior to enhance the reliability of the control system in respect that each sub-controller keeps its own action autonomy.
Keywords/Search Tags:Structural Vibration Control, MBC Strategy, Smart Isolation, Semi-active Control, Decentralized Control
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