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、VPT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.
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