WPT模态控制算法在空间结构振动控制上的应用
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摘要
针对复杂结构自由度庞大、频率密集的特点,引入了小波包分解对传统的模态半主动控制算法进行改进,提出了WPT模态半主动控制算法。通过在一体育场挑篷结构上进行的数值仿真结果表明:WPT控制算法在竖向地震激励下可以有效减小结构的地震响应,其对峰值反应的控制效果比传统模态控制算法有所改进。由于WPT模态控制算法中控制方程的维数较少,因而具有更好的实用性和工程应用前景。
Complex structures are featured by their huge degrees-of-freedoms and the close spaced frequencies.Wavelet packet transform(WPT) is introduced to traditional modal controller and a WPT modal controller is proposed.A numerical simulation was carried on a stadium roof structure excited by vertical earthquake component,the numerical results show that the proposed WPT modal controller can greatly reduce seismic responses of the structure;and compared with traditional modal controller,the peak value can be more effectively reduced by WPT modal controller.Since there will be less dimension on modal controller,thus the controller will have better practicality and engineering application.
Complex structures are featured by their huge degrees-of-freedoms and the close spaced frequencies.Wavelet packet transform(WPT) is introduced to traditional modal controller and a WPT modal controller is proposed.A numerical simulation was carried on a stadium roof structure excited by vertical earthquake component,the numerical results show that the proposed WPT modal controller can greatly reduce seismic responses of the structure;and compared with traditional modal controller,the peak value can be more effectively reduced by WPT modal controller.Since there will be less dimension on modal controller,thus the controller will have better practicality and engineering application.
引文
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[7]李忠献,林伟,丁阳.行波效应对大跨度空间网格结构地震响应的影响[J].天津大学学报,2007,40(1):1-8.
[8]Adeli H,Kim H.Wavelet-hybrid feedback-least mean square al-gorithm for robust control of structures[J].Journal of StructuralEngineering..2004,130(1):128-137.
[9]Sun Z,Chang CC.Structural damage assessment based on waveletpacket transform[J].Journal of Structural Engineering.2002,128(10):1354-1361.
[2]曹资,薛素铎.空间结构抗震理论与设计[M].北京:科学出版社,2005.
[3]Cigada A,Caprioli A,Redaelli M,Vanali M.Vibration testing atMeazza stadium:Reliability of operational modal analysis to healthmonitoring purposes[J].Journal of Performance of Constructed Fa-cilities 2008.22(4):228-237.
[4]Duan YF,Ni YQ,Ko JM.State-derivative feedback control ofcable vibration using semiactive magnetorheological dampers[J].Computer-Aided Civil and Infrastructure Engineering 2005;20(6):431-449.
[5]赵斌,吴敏哲.建筑结构振动控制的趋近律滑移模态方法[J].工程力学,2001,18(3):67-73.
[6]Zhou L,Chang C C,Spencer B F Jr.Intelligent technology-basedcontrol of motion and vibration using MR dampers[J].EarthquakeEngineering and Engineering Vibration.2002,1(1):100-110.
[7]李忠献,林伟,丁阳.行波效应对大跨度空间网格结构地震响应的影响[J].天津大学学报,2007,40(1):1-8.
[8]Adeli H,Kim H.Wavelet-hybrid feedback-least mean square al-gorithm for robust control of structures[J].Journal of StructuralEngineering..2004,130(1):128-137.
[9]Sun Z,Chang CC.Structural damage assessment based on waveletpacket transform[J].Journal of Structural Engineering.2002,128(10):1354-1361.
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