A new bi-directional giant magnetostrictive-driven compliant tensioning stage oriented for maintenance of the surface shape precision. (August 2018)

• Record Type: Journal Article
• Authors: Sun, Xiaoqing; Yi, Sicheng; Wang, Zhilei; Yang, Bintang
• Is Part Of: Mechanism and machine theory. Volume 126(2018)
• Page Start: 359
• Page End: 376
• Publication Date: 2018-08
• Subjects: Compliant tensioning stage -- Membrane mirror -- Surface shape precision -- Giant magnetostrictive actuator (GMA) -- Optimal design -- Active control; Machine theory -- Periodicals; Machinery -- Periodicals; Machines -- Périodiques; Génie mécanique -- Périodiques; Machine theory; Machinery; Periodicals; 621.81
• DOI: 10.1016/j.mechmachtheory.2018.04.017
• Languages: English
• ISSNs: 0094-114X

Abstract

Highlights: A novel tensioning stage based on flexure mechanism is proposed to solve this dilemma of the more adoption of actuators, the better the effect, but the larger the added mass and more complex the control system in boundary actuation scheme oriented for maintenance of surface shape precision. Symmetrical tensioning along the four directions in the orthogonal axis with just one single actuator has been realized by ingenious design. FEA optimization strategy has been utilized for structure design and a prototype is manufactured to validate the desired capability. Dynamic model and amplification ratio model of the tensioning stage have been constructed based on velocity projection theorem and PRBM method, which could be used for fast performance evaluation. Abstract: Membrane mirror, known for its perspicuous feature of light weight, high packaging efficiency, low manufacturing cost and etc., has been widely used in the precision optical instruments, such as the primary mirror applied on a space telescope. However, how to maintain the membrane mirror's surface shape precision at a high level is still a challenging problem. Therefore, a bi-directional giant magnetostrictive-driven compliant tensioning stage is proposed in this research, and the basic performance of the stage is studied through theoretical analysis, numerical simulation and experimental investigations. First, the performance requirements and conceptual design are presented and illustrated in detail. Second, the Pseudo Rigid Body Model method is selected as the basis of further investigating the stage and the dynamic model is established through Lagrange's equation. Meanwhile, numerical simulations are performed to analyze the basic performances. Finally, a prototype is manufactured and based on this device, some experiments are conducted. The results indicate that the developed tensioning stage is able to achieve the desired capability and could effectively maintain the surface shape precision.