Cooperative control strategy of two-way hydraulic cylinder of hydraulic rolling shear based on cross-coupling error

Possessing advantages like small tonnage, low cost and powerful shear force, hydraulic rolling shear is to replace the crank and connecting rod mechanical structure with hydraulic power supply. The hydraulic rolling shear is featured by controlling 2 hydraulic cylinders of a shear blade track to be horizontally placed and achieving the rolling movement upon upper shear blades driven by the hinge joints on upper and lower composite linkage. It requires the control system to ensure a precise relative spatial location of two-hydraulic servo cylinder and completion of motion trail with different speeds on temporal points in the cutting period. In order to solve the problem, a fuzzy PID controller resolving cross coupling errors generated during the synergy movement of two-way hydraulic cylinder is hereby proposed, which has successfully promoted and applied in several items of hydraulic rolling shear. The practical application has verified the relatively strong robustness and self-adapted ability of the control system, which can control the accuracy at a higher location under complex and atrocious conditions and greatly improved the quality of cross-section cut. © 2016 American Scientific Publishers All rights reserved.