1.Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology, Harbin 150090, China;
2.Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology, Harbin Institute of Technology, Harbin 150090, China;
3.School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China
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.
许国山1,2,3，郑雪梅1,2,3，陈琦1,2,3，王贞1,2,3. 三自由度加载系统高精度加载控制方法试验研究[J]. 振动与冲击, 2020, 39(12): 23-31.
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. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(12): 23-31.
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