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Experimental study of a new kind of double-layer shaking table

机译：一种新型双层振动桌的实验研究

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Existing large-scale electrohydraulic shaking tables (EHSTs) have limited frequency bandwidth because of the capacity of electrohydraulic systems. Here we propose a double-layer shaking table (DLST) which is capable of generating excitations over a wide band of frequencies. The lower table is a conventional EHST with a long-stroke actuator which can generate low-frequency excitations. The upper table is fixed atop the lower table, and equipped with a short-stroke actuator which can generate high-frequency excitations. The FFT/IFFT signal separation process, three-variable control algorithm, and feedforward compensation technique are employed to control the shaking table. The two tables are controlled simultaneously to ensure the upper table reproduces ground motions over a wide frequency bandwidth. A series of experiments were performed on a unidirectional DLST. The results suggest that the DLST can successfully reproduce excitations over a wide band of frequencies, and demonstrate that the proposed control methods are effective. The control procedure in which the upper table tracks the full-frequency signal to compensate for the tracking errors of the lower table is recommended.
机译：由于电液系统的容量，现有的大型电液摇动台（EHSTS）具有有限的频率带宽。在这里，我们提出了一种双层摇动台（DLST），其能够在宽频带上产生激励。下表是具有长冲程致动器的传统EHST，其可以产生低频激发。上桌子固定在下部桌子上，并配备有一个短行程致动器，可以产生高频激励。 FFT / IFFT信号分离过程，三变控制算法和前馈补偿技术被采用来控制摇动台。同时控制两个表，以确保上表在宽频带宽上再现地面运动。在单向DLST上进行一系列实验。结果表明，DLST可以成功地在宽带频带上再现激动，并证明所提出的控制方法是有效的。建议使用上表跟踪全频信号以补偿下表的跟踪误差的控制过程。

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