Impact force calibration method based on load reconstruction

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (13) : 22-26.

JIANG Wensong1,2,LUO Zai1, WANG Zhongyu2, ZHANG Li3, HU Xiaofeng1, GUO Bin1

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Abstract

The error of the Impact Force Measurement System comes from the force difference between the measuring point and the collision point because the drop hammer is not a rigid structure. To overcome this error, an calibration method is proposed based on load reconstruction. First, a rth order grey prediction model is applied to filter the structural response on the measuring point of the drop hammer. Second, the load reconstruction model between the measuring point and the collision point is built by the regularization of the kernel matrix. The experimental result shows that the Peak Relative Error (PRE) and the Relative Error (RE) of this method are 0.6% and 3.1% while that of the traditional method are 5.7% and 6.8%. It demonstrates that our suggested method can reduce the PRE by 89.2% and the RE by 54.8% compared with the traditional method. Therefore, Our suggested method is superior to the traditional method.

Key words

impact force measurement / error compensation / load reconstruction / Tikhonov regularization

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JIANG Wensong1,2,LUO Zai1, WANG Zhongyu2, ZHANG Li3, HU Xiaofeng1, GUO Bin1. Impact force calibration method based on load reconstruction[J]. Journal of Vibration and Shock, 2020, 39(13): 22-26

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