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Frontiers of Mechanical Engineering

Front. Mech. Eng.
Structural parameter design method for a fast-steering mirror based on a closed-loop bandwidth
Guozhen CHEN, Pinkuan LIU(), Han DING
School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
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When a fast-steering mirror (FSM) system is designed, satisfying the performance requirements before fabrication and assembly is vital. This study proposes a structural parameter design approach for an FSM system based on the quantitative analysis of the required closed-loop bandwidth. First, the open-loop transfer function of the FSM system is derived. In accordance with the transfer function, the notch filter and proportional-integral (PI) feedback controller are designed as a closed-loop controller. The gains of the PI controller are determined by maximizing the closed-loop bandwidth while ensuring the robustness of the system. Then, the two unknown variables of rotational radius and stiffness in the open-loop transfer function are optimized, considering the bandwidth as a constraint condition. Finally, the structural parameters of the stage are determined on the basis of the optimized results of rotational radius and stiffness. Simulations are conducted to verify the theoretical analysis. A prototype of the FSM system is fabricated, and corresponding experimental tests are conducted. Experimental results indicate that the bandwidth of the proposed FSM system is 117.6 Hz, which satisfies the minimum bandwidth requirement of 100 Hz.

Keywords fast-steering mirror      structural parameter      PI controller      bandwidth      notch filter     
Corresponding Authors: Pinkuan LIU   
Just Accepted Date: 26 June 2019   Online First Date: 25 July 2019   
 Cite this article:   
Guozhen CHEN,Pinkuan LIU,Han DING. Structural parameter design method for a fast-steering mirror based on a closed-loop bandwidth[J]. Front. Mech. Eng., 25 July 2019. [Epub ahead of print] doi: 10.1007/s11465-019-0545-y.
Fig.1  Mechanical design of the FSM. MCM: Monolithic compliant mechanism; VCA: Voice coil actuator.
Fig.2  (a) Monolithic compliant mechanism; (b) elastic kinematic chain.
Fig.3  Block diagram of the closed-loop control system.
Fig.4  Parameter optimization of the gains of the PI controller gains.
Fig.5  Effects of variables on the bandwidth of the closed-loop control system. Effects of (a) rotational stiffness and (b) rotational radius.
Fig.6  Local coordinate frames of the (a) translational and (b) rotational plates.
Fig.7  Coordinate frames of the compliant mechanism.
Fig.8  Coordinate frame of the FSM.
Fig.9  Rotational motion of the FSM.
Fig.10  Simulation results of (a) open-loop and (b) closed-loop frequency responses.
Fig.11  Experimental setup of the stage: (a) Motion control system; (b) fast steering mirror stage.
Fig.12  Stiffness of the FSM around (a) x-axis and (b) y-axis.
Fig.13  Open-loop system identification of the FSM.
Fig.14  Experimental results of the (a) open-loop frequency response around the x-axis; (b) closed-loop frequency response around the x-axis; (c) open-loop frequency response around the y-axis; (d) closed-loop frequency response around the y-axis.
Fig.15  Sinusoidal signal responses of the FSM around (a) the x- and (b) the y-axes.
Fig.15  Sinusoidal signal responses of the FSM around (a) the x- and (b) the y-axes.
Fig.16  Motion resolution of the FSM.
Fig.16  Motion resolution of the FSM.
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