Session: MR-03-01 Compliant Mechanisms (A. Midha Symposium)
Paper Number: 70068
Start Time: August 17, 03:20 PM
70068 - A Novel Micro-Positioning Stage With Large-Stroke and Adjustable Stiffness
The existing micro-motion stage based on flexure hinge can hardly meet the requirements of a high-precision stage with large stroke and variable operating conditions (especially variable frequency operation). In this paper, a flexible hinge micro-motion stage with adjustable stiffness is presented. A wide range of stiffness and frequency adjustments are realized by changing the length of the flexure hinge through the movement of the support. However, the change on the stiffness of the flexure hinge is non-linear when is in large deformation. It is difficult to use the traditional PID algorithm to control such nonlinear system without the complete mathematical model, and much more complicated control strategies are required to deal with the condition of large deformation of the flexure hinge. In this paper, the active disturbance rejection control (ADRC) strategy is adopted to solve the above non-linear control problem without relying on the complete system model. A novel model-compensated ADRC based on the dynamic characteristics is proposed to further improve the performance of the micro-motion stage. Experiments show that the ADRC with model compensation (MADRC) can achieve high positioning and tracking precision faster than the conventional ADRC. The presented micro-motion stage based on stiffness-adjustable flexure hinges and MADRC design is capable to meet the industrial application requirements oflarge stroke or variable working conditions.
Presenting Author: Zhijun Yang GuangDong Univ of Technology
Authors:
Zhijun Yang Guangdong University of TechnologyBingyu Cai Guangdong University of Technology
Ruiqi Li Guangdong University of Technology
Hao Peng Guangdong University of Technology
Youdun Bai Guangdong University of Technology
A Novel Micro-Positioning Stage With Large-Stroke and Adjustable Stiffness
Paper Type
Technical Paper Publication