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Purpose: <p>In order to evaluate <Emphasis Type="BoldItalic">the mechanical feasibility</Emphasis> of the domestic baffle made by wire electrode cutting for the mirror assembly of the <Emphasis Type="BoldItalic">Follow-up</Emphasis> X-ray Telescope (FXT) onboard the Einstein Probe (EP) mission.</p> Methods: <p>Finite element analysis <Emphasis Type="BoldItalic">was performed</Emphasis> to compare the structural differences between <Emphasis Type="BoldItalic">the domestic baffle</Emphasis> made by wire electrode cutting and the eROSITA baffle made by bonding. The finite element models <Emphasis Type="BoldItalic">were verified</Emphasis> by test data in advance to avoid significant deviations. Finally, the differences <Emphasis Type="BoldItalic">in</Emphasis> dynamical performances between the FXT mirror assemblies with the two baffles were investigated <Emphasis Type="BoldItalic">through</Emphasis> modal analysis and frequency response analysis <Emphasis Type="BoldItalic">using</Emphasis> the pre-verified models.</p> Results and conclusions: <p>The results show that, from the perspective of the <Emphasis Type="BoldItalic">entire</Emphasis> mirror assembly, their <Emphasis Type="BoldItalic">eigenfrequencies</Emphasis> remain similar, except for the second lateral <Emphasis Type="BoldItalic">eigenfrequency</Emphasis>, which shifts forward by <Emphasis Type="BoldItalic">approximately</Emphasis> 24 Hz <Emphasis Type="BoldItalic">in</Emphasis> the mirror assembly equipped with the domestic baffle. <Emphasis Type="BoldItalic">However, for the X-ray baffles themselves</Emphasis>, the axial and lateral <Emphasis Type="BoldItalic">eigenfrequencies</Emphasis> of the two baffles differ by approximately 49 Hz and 185 Hz, respectively. <Emphasis Type="BoldItalic">These eigenfrequencies are staggered, ensuring</Emphasis> that over-response is avoided. In terms of response amplification, the domestic baffle, compared to <Emphasis Type="BoldItalic">the</Emphasis> eROSITA baffle, <Emphasis Type="BoldItalic">exhibits inferior</Emphasis> axial mechanical characteristics <Emphasis Type="BoldItalic">but superior lateral characteristics</Emphasis>. <Emphasis Type="BoldItalic">In summary, from a mechanical perspective, the domestic baffle is feasible</Emphasis>.</p>

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Numerical dynamical analysis of two types of X-ray baffles onboard EP-FXT mirror assembly

  • 期刊论文

  • 发表日期：

    2025年5月24日

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  • Bing Lu,
  • Juan Wang,
  • Yanji Yang,
  • Dawei Han,
  • Weiwei Cui,
  • Yusa Wang,
  • Jia Ma,
  • Aimei Zhang,
  • Sheng Yang,
  • Ruijie Wang,
  • Yong Chen

摘要

Purpose:

In order to evaluate the mechanical feasibility of the domestic baffle made by wire electrode cutting for the mirror assembly of the Follow-up X-ray Telescope (FXT) onboard the Einstein Probe (EP) mission.

Methods:

Finite element analysis was performed to compare the structural differences between the domestic baffle made by wire electrode cutting and the eROSITA baffle made by bonding. The finite element models were verified by test data in advance to avoid significant deviations. Finally, the differences in dynamical performances between the FXT mirror assemblies with the two baffles were investigated through modal analysis and frequency response analysis using the pre-verified models.

Results and conclusions:

The results show that, from the perspective of the entire mirror assembly, their eigenfrequencies remain similar, except for the second lateral eigenfrequency, which shifts forward by approximately 24 Hz in the mirror assembly equipped with the domestic baffle. However, for the X-ray baffles themselves, the axial and lateral eigenfrequencies of the two baffles differ by approximately 49 Hz and 185 Hz, respectively. These eigenfrequencies are staggered, ensuring that over-response is avoided. In terms of response amplification, the domestic baffle, compared to the eROSITA baffle, exhibits inferior axial mechanical characteristics but superior lateral characteristics. In summary, from a mechanical perspective, the domestic baffle is feasible.