TY - JOUR
T1 - Force Control of Electro-Hydraulic Servo System Based on Load Velocity Compensation
AU - Wang, Shoukun
AU - Liu, Hu
AU - Wang, Junzheng
AU - Zhang, Deyang
N1 - Publisher Copyright:
© 2018 Editorial Department of Journal of Beijing Institute of Technology.
PY - 2018/9/1
Y1 - 2018/9/1
N2 - In an electro-hydraulic servo control system, the force servo system is an important component. However, due to the nonlinear characteristic of hydraulic systems, traditional control methods cannot achieve satisfactory control performances. To deal with this issue, a load velocity compensation algorithm based on the structural invariant principle is proposed in this paper. First, the theoretical analysis of the hydraulic and cylindrical force control system is presented, and the mathematical model of the force control system is established. Then the open-loop frequency response characteristics of the system are analyzed, in which the Bode diagram shows that the bandwidth of the system is obviously expanded after adopting the load velocity compensation algorithm. Finally, a practical hydraulic and cylindrical force servo system is introduced to validate the feasibility of the proposed controller, the experimental results demonstrate that the proposed method can improve the performance of force control and eliminate the influence of load stiffness on the dynamic characteristics of the system through a set of comparative experiments with different elastic loads.
AB - In an electro-hydraulic servo control system, the force servo system is an important component. However, due to the nonlinear characteristic of hydraulic systems, traditional control methods cannot achieve satisfactory control performances. To deal with this issue, a load velocity compensation algorithm based on the structural invariant principle is proposed in this paper. First, the theoretical analysis of the hydraulic and cylindrical force control system is presented, and the mathematical model of the force control system is established. Then the open-loop frequency response characteristics of the system are analyzed, in which the Bode diagram shows that the bandwidth of the system is obviously expanded after adopting the load velocity compensation algorithm. Finally, a practical hydraulic and cylindrical force servo system is introduced to validate the feasibility of the proposed controller, the experimental results demonstrate that the proposed method can improve the performance of force control and eliminate the influence of load stiffness on the dynamic characteristics of the system through a set of comparative experiments with different elastic loads.
KW - Elastic load
KW - Electro-hydraulic servo control system
KW - Force servo control
KW - Load velocity compensation
UR - http://www.scopus.com/inward/record.url?scp=85056513343&partnerID=8YFLogxK
U2 - 10.15918/j.jbit1004-0579.17065
DO - 10.15918/j.jbit1004-0579.17065
M3 - Article
AN - SCOPUS:85056513343
SN - 1004-0579
VL - 27
SP - 326
EP - 333
JO - Journal of Beijing Institute of Technology (English Edition)
JF - Journal of Beijing Institute of Technology (English Edition)
IS - 3
ER -