Real-time method for structural load and parameters’ joint identification based on GDF method

WAN Zhimin1,3,WANG Ting2,LI Lin3,LU Qiongye1

Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (13) : 158-163.

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PDF(1730 KB)
Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (13) : 158-163.

Real-time method for structural load and parameters’ joint identification based on GDF method

  • WAN Zhimin1,3,WANG Ting2,LI Lin3,LU Qiongye1
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Abstract

Structural load and parametric identification are important contents in structural dynamics field. At present, there are some studies focusing on joint identification of them. The extended GDF (EGDF) method presented here by the authors has the ability to continuously identify unknown loads and parameters. However, it is necessary to know acceleration responses at locations unknown loads exerted on. Besides, like other identification methods based on the least square, the EGDF method has low frequency drift phenomena of identified unknown loads and displacements. Here, a modified method was proposed to convert this recognition problem into the recognition of modal displacements and modal loads in modal space, and then the modal truncation technique was used to obtain the real-time EGDF method. Furthermore, taking displacement and acceleration as measured responses, the data fusion technique was used to solve low frequency drift problems in identification results.
 

Key words

 load identification / parameter identification / the GDF algorithm / modal truncation / data fusion

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WAN Zhimin1,3,WANG Ting2,LI Lin3,LU Qiongye1. Real-time method for structural load and parameters’ joint identification based on GDF method[J]. Journal of Vibration and Shock, 2019, 38(13): 158-163

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