Experimental verification of a high-precision loading control method for a loading system with three degrees of freedom

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (12) : 23-31.

XU Guoshan1,2,3，ZHENG Xuemei1,2,3，CHEN Qi1,2,3，WANG Zhen1,2,3

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Abstract

The control method of the three-degree-of-freedom loading system is systematically studied in this paper. First of all, the existing more accurate control methods are analyzed and introduced. Then, the bending and shear test was carried out on the large-scale multi-function three-degree-of-freedom loading system of Harbin Institute of Technology with the three-degree-of-freedom loading control software. The article analyzes the accuracy of the force-displacement mixed control (based on actuator feedback in the vertical direction) method，the force-displacement mixed control (based on LVDT feedback in the vertical direction) method and the force-displacement mixed control method considering the geometric nonlinearity. It is shown that the force-displacement mixed control method considering the geometric nonlinearity is the most accurate for the control of the three-degree-of-freedom loading test.

Key words

/ loading system with three degrees of freedom, force-displacement mixed control method, geometric nonlinearity, controlling software, quasi-static test

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XU Guoshan1,2,3，ZHENG Xuemei1,2,3，CHEN Qi1,2,3，WANG Zhen1,2,3. Experimental verification of a high-precision loading control method for a loading system with three degrees of freedom[J]. Journal of Vibration and Shock, 2020, 39(12): 23-31

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