Optimizing driving curve of mechanical shutter with large aperture and suppressing excitation force

Wei LIANG; Kai-yu QIN; Xiao-dong GAO; Ren-kui JIANG

doi:10.37188/OPE.2020.0509

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Optimizing driving curve of mechanical shutter with large aperture and suppressing excitation force

Micro/Nano Technology and Fine Mechanics | 更新时间：2021-05-12

- Optimizing driving curve of mechanical shutter with large aperture and suppressing excitation force
- Optics and Precision Engineering Vol. 29, Issue 4, Pages: 772-781(2021)
- 作者机构：
  
  1.电子科技大学航空航天学院，四川成都 611731
  2.中国科学院光电技术研究所，四川成都 610209
- 作者简介：
- 基金信息：
- DOI：10.37188/OPE.2020.0509
  CLC： TH69
- Received：08 October 2020，
  
  Revised：11 November 2020，
  
  Published：15 April 2021
- 稿件说明：
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梁伟,秦开宇,高晓东等.大口径机械快门驱动曲线优化及激振力抑制[J].光学精密工程,2021,29(04):772-781.

LIANG Wei,QIN Kai-yu,GAO Xiao-dong,et al.Optimizing driving curve of mechanical shutter with large aperture and suppressing excitation force[J].Optics and Precision Engineering,2021,29(04):772-781.
梁伟,秦开宇,高晓东等.大口径机械快门驱动曲线优化及激振力抑制[J].光学精密工程,2021,29(04):772-781. DOI： 10.37188/OPE.2020.0509.

LIANG Wei,QIN Kai-yu,GAO Xiao-dong,et al.Optimizing driving curve of mechanical shutter with large aperture and suppressing excitation force[J].Optics and Precision Engineering,2021,29(04):772-781. DOI： 10.37188/OPE.2020.0509.

摘要

巡天相机大口径机械快门旋转产生的微振动是巡天相机的主要扰动源之一。微振动将降低空间光学望远镜的成像分辨率，而快门受到空间和质量的限制无法采取静动平衡抑制措施；快门运行频率非常低，仅为0.77 Hz，传统的被动隔振方法不能兼顾其隔振效果和支撑刚度。本文使用对开式快门结构形式来对消两转轴平面内的激振力，使两转轴平面法向的激振力加倍。根据对开式快门特点，本文提出了基于驱动曲线优化的激振力抑制方法，通过建立机械快门的激振力数学模型，以两转轴平面法向激振力峰值绝对值最小为优化目标，采用单纯形法优化快门驱动曲线。仿真实验表明：微振动的中高频成分得到充分抑制，转轴轴向激振力幅值由0.73 N降低至0.018 N；两转轴平面法向激振力由2.92 N降低至1.72 N，降低了41%，由此验证了数学模型的正确和优化方法的有效。该方法可应用于其它类似旋转机构的减振设计与优化中。

Abstract

As the micro-vibrations generated by the mechanical shutter （with a large aperture） of a survey camera decreases the imaging resolution of an optical telescope also gets suppressed. Static and dynamic balancing methods cannot be used due to limitations in mass and volume of the shutter. The passive vibration isolation method cannot simultaneously meet the requirements of isolation efficiency and structural stability due to the low operating frequency of the shutter， which is only 0.77 Hz. Therefore， an arrangement in which two partially open shutter blades are facing each other was proposed. The excitation force of the shutters was eliminated in one direction （y-direction） but is doubled in the other （z-direction）. Based on the characteristics of partially open shutters， a method was proposed in which the excitation force along the z-direction was suppressed by optimizing the driving curve. The excitation force of the shutter was modeled mathematically and its absolute value along the z-direction was minimized by optimizing the driving curve of the shutter using simplex method. Simulation test results show that the medium- and high-frequency components of the micro-vibrations are suppressed. The amplitude of the excitation force along the y-direction is reduced by 97.5% （from 0.73 N to 0.018 N）. The excitation force along the z-direction is reduced by 41% （from 2.92 N to 1.72 N）. The results of finite element analysis verify the correctness of the suppression method， which can be applied to the design and optimization of other similar rotating mechanisms.

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