Three dimensional isolation system for large ground-based optical telescope

Shouwei HU; Yong ZHANG; Yuefei WANG; You WANG

doi:10.37188/OPE.20223006.0659

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Three dimensional isolation system for large ground-based optical telescope

Modern Applied Optics | 更新时间：2022-04-26

- Three dimensional isolation system for large ground-based optical telescope
- Optics and Precision Engineering Vol. 30, Issue 6, Pages: 659-666(2022)
- 作者机构：
  
  1.中国科学院国家天文台南京天文光学技术研究所，江苏南京 210042
  2.中国科学院天文光学技术重点实验室，江苏南京 210042
- 作者简介：
- 基金信息：
- DOI：10.37188/OPE.20223006.0659
  CLC： P111;TH122
- Received：19 August 2021，
  
  Revised：11 October 2021，
  
  Published：25 March 2022
- 稿件说明：
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胡守伟,张勇,王跃飞等.大型地基光学望远镜三维隔震系统[J].光学精密工程,2022,30(06):659-666.

HU Shouwei,ZHANG Yong,WANG Yuefei,et al.Three dimensional isolation system for large ground-based optical telescope[J].Optics and Precision Engineering,2022,30(06):659-666.
胡守伟,张勇,王跃飞等.大型地基光学望远镜三维隔震系统[J].光学精密工程,2022,30(06):659-666. DOI： 10.37188/OPE.20223006.0659.

HU Shouwei,ZHANG Yong,WANG Yuefei,et al.Three dimensional isolation system for large ground-based optical telescope[J].Optics and Precision Engineering,2022,30(06):659-666. DOI： 10.37188/OPE.20223006.0659.

摘要

地震灾害是天文台规划和望远镜结构建设时迫切需要重视的一个重要安全问题。为了满足大型地基光学望远镜的抗震要求，本文设计了具有独特特点的基于液压阻尼技术的三维隔震系统，该系统主要由望远镜液压支撑系统中的附加被动元件组成，能够感知临界震动，并在达到临界加速度值时启动整个减震系统，将载荷限制在可接受的范围内。大量有限元分析结果表明：一方面，没有隔震系统的望远镜系统会发生明显的输入震动放大响应，其对输入地震波的放大率在NS方向约为142%，EW方向约为145%，UD方向约为369%；另一方面，与输入地震波相比，隔震系统可以抑制响应加速度，其响应函数在NS方向约为22%，EW方向约为38%，UD方向约为4%。上述结果验证了该三维隔震系统具有良好的隔震性能，能够满足大型地面光学望远镜的抗震设计要求。

Abstract

Seismic hazards are an important issue for both observatory and telescope structures. In order to meet the anti-seismic requirements of large ground-based optical telescopes， a three-dimensional isolation system with unique characteristics is proposed and designed. A hydraulic damping system， which consists of additional passive components in the hydraulic supporting system of the telescope， senses critical oscillations and initiates the isolation system of the telescope before critical acceleration values are reached， in order to limit the loads to acceptable values. Finite element analysis results indicate that responses of the telescope main structure without the isolation system show significant dynamic amplification， and their amplification to input ratios for the NS， EW， and UD directions are about 142%， 145%， and 369%， respectively. By contrast， the isolation system suppresses response acceleration compared with input， and their amplification ratios for the NS， EW， and UD directions are about 22%， 38%， and 4%， respectively. Simulation analyses show that the isolation system can achieve adequate seismic isolation performance and meets the anti-seismic design requirements of large ground-based optical telescopes.

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references

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