PSD replication of shaking table based on subband adaptive filter algorithm

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (19) : 138-142.

ZHANG Bing1，XIE Fang-wei1，ZHANG Xin-xing2，WANG Cun-tang1，ZHAI Chang-pan3，AN Jun-wei4

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Abstract

To improve the accuracy of power spectrum density (PSD) replication of hydraulic shaking table and to reduce the PSD equalization time, a new system identification (SID) technology based on subband adaptive filter algorithm is adopt and studied in this paper. The quality of SID of shaking system is one of key factor that influences the PSD replication precision and equalization time through analyzing the principle of PSD equalization of hydraulic shaking table. The structure of the subband adaptive filter is investigated, the iteration equation is derived and the condition of convergence of this SID technology is discussed. Meanwhile, a new method for the design of nearly perfect reconstruction cosine modulated filter banks is introduced to decompose signal into different subband smoothly and decrease the distortion of amplitude and aliasing of the filter banks. Finaly, the efficiency of the subband adaptive filter SID technology is verified by the simulation of PSD replication of shaking table using Matlab/Simulink.

Key words

Fluid power transmission and control / Hydraulic shaking table / subband adaptive filter / power spectrum density / filter banks

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ZHANG Bing1，XIE Fang-wei1，ZHANG Xin-xing2，WANG Cun-tang1，ZHAI Chang-pan3. PSD replication of shaking table based on subband adaptive filter algorithm[J]. Journal of Vibration and Shock, 2016, 35(19): 138-142

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