Research on Non-circular Journal Orbit Forming Technology of Hydrostatic Bearing-spindle System Based on Repetitive Control

doi:10.3901/JME.2023.09.274

Abstract

Abstract: The non-circular journal orbit forming technology can be used for special applications such as shaped surface processing. In order to improve the forming accuracy of non-circular journal orbit, a repetitive control method of controllable hydrostatic bearing spindle system is proposed. The controllable hydrostatic bearing spindle system is a multivariable coupled system with a complex model. In order to facilitate the design of the controller, the original linear parametric model of the system is simplified and a linear decoupling model is established. According to the characteristics of non-circular journal orbit forming, the repetitive controller is introduced into the original PI control system, and each parameter of the repetitive controller is designed according to the stability criterion. Meanwhile, to ensure the tracking accuracy of the system for non-circular trajectory, the influence between the gain parameters on the stability and performance of the system is analyzed. Finally, a controlled hydrostatic bearing spindle simulation and experiment system is established, and the repetitive control is compared with the traditional PI control strategy. The results show that the repetitive control system has stronger robustness and smaller steady-state error, meanwhile, the control accuracy is significantly improved compared with the PI control system.

Key words: repetitive control, non-circular journal orbit, hydrostatic bearing

CLC Number:

TH137

XIANG Shaotong, PAN Wei, ZHANG Yixin, CHEN Shujiang, LU Changhou. Research on Non-circular Journal Orbit Forming Technology of Hydrostatic Bearing-spindle System Based on Repetitive Control[J]. Journal of Mechanical Engineering, 2023, 59(9): 274-284.

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