title: Coupling effect and control strategies of the maglev dual-stage inertially stabilization system based on frequency-domain analysis.
abstract: Maglev dual-stage inertially stabilization (MDIS) system is a newly proposed system which combines a conventional two-axis gimbal assembly and a 5-DOF (degree of freedom) magnetic bearing with vernier tilting capacity to perform dual-stage stabilization for the LOS of the suspended optical instrument. Compared with traditional dual-stage system, maglev dual-stage system exhibits different characteristics due to the negative position stiffness of the magnetic forces, which introduces additional coupling in the dual stage control system. In this paper, the coupling effect on the system performance is addressed based on frequency-domain analysis, including disturbance rejection, fine stage saturation and coarse stage structural resonance suppression. The difference between various control strategies is also discussed, including pile-up(PU), stabilize-follow (SF) and stabilize-compensate (SC). A number of principles for the design of a maglev dual stage system are proposed. A general process is also suggested, which leads to a cost-effective design striking a balance between high performance and complexity. At last, a simulation example is presented to illustrate the arguments in the paper.
authors.affiliation: Space Mapping and Remote Sensing Information Processing Center, Beijing 102102, China. Electronic address: superlinhuchong@163.com.
authors.forename: Zhuchong
authors.initials: Z
authors.lastname: Lin
authors.affiliation: College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China. Electronic address: liukun_open@163.com.
authors.forename: Kun
authors.initials: K
authors.lastname: Liu
authors.affiliation: College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China. Electronic address: zhangkaiyue2004@aliyun.com.
authors.forename: Li
authors.initials: L
authors.lastname: Zhang
authors.affiliation: College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China. Electronic address: 18670387476@163.com.
authors.forename: Delin
authors.initials: D
authors.lastname: Zeng
keywords: Dual-stage control; Frequency-domain analysis; Magnetic suspension; Precision pointing