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Related Concept Videos

Thin-Walled Hollow Shafts01:15

Thin-Walled Hollow Shafts

316
In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution...
316
General Case of Eccentric Axial Loading01:12

General Case of Eccentric Axial Loading

312
Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from symmetrical bending, which are essential for designing structures to withstand different loading conditions.
Consider a member subjected to equal and opposite forces that are applied along a line that does not coincide with the member's neutral axis. In unsymmetrical...
312
Unsymmetric Loading of Thin-Walled Members01:23

Unsymmetric Loading of Thin-Walled Members

211
Thin-walled members with non-symmetrical cross-sections are vital to engineering structures, offering material efficiency and structural integrity. However, unsymmetrical loading on these members leads to complex stress distributions, resulting in simultaneous bending and twisting can cause deformation or structural failure. The interaction between bending and twisting requires detailed analysis to ensure structural resilience.
The concept of the shear center is crucial in countering the...
211
Eccentric Axial Loading in a Plane of Symmetry01:16

Eccentric Axial Loading in a Plane of Symmetry

355
Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.
355
Deformation in a Circular Shaft01:10

Deformation in a Circular Shaft

530
One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
530
Design of Prismatic Beams for Bending01:23

Design of Prismatic Beams for Bending

441
The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and...
441

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Updated: Oct 25, 2025

Construction of a High Resolution Microscope with Conventional and Holographic Optical Trapping Capabilities
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Lightweight cylindrical composite shell structures to support optical instruments in extremely large telescopes: A

Lingyu Zheng1, Daxu Zhang1, Long Wang2

  • 1Shanghai Key Laboratory for Digital Maintenance of Buildings and Infrastructure, State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai, China.

Science Progress
|August 5, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed lightweight composite shells for large telescope optical instruments. This optimized design significantly reduced weight by 50% while maintaining structural performance, proving efficient for future telescope support structures.

Keywords:
Telescopecomposite structuresfinite element analysisoptical spectrographoptimisation

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Area of Science:

  • Mechanical Engineering
  • Materials Science
  • Astrophysical Instrumentation

Background:

  • Extremely large telescopes require supporting structures that are both lightweight and structurally robust.
  • Current optical instrument support structures face challenges with heavy weight and performance limitations.

Purpose of the Study:

  • To design and optimize lightweight composite shell structures for optical instrument support in extremely large telescopes.
  • To address the mass and stiffness requirements for the Wide-Field Optical Spectrograph (WFOS) of the Thirty Meter Telescope (TMT).

Main Methods:

  • A design scheme using cylindrical composite shells was proposed.
  • Finite element models were developed for structural analysis.
  • Size and ply sequence optimizations were performed on the composite structures.

Main Results:

  • The optimized WFOS cylindrical composite shell structure achieved an approximate 50% mass reduction.
  • Key performance metrics, including maximum displacement (0.513 mm) and fundamental frequency (8.275 Hz), remained largely unchanged post-optimization.
  • Evaluations included mass, displacement, failure index, and fundamental frequency.

Conclusions:

  • Cylindrical composite shell structures are an effective and efficient solution for supporting large optical instruments.
  • Optimization techniques can significantly reduce the weight of telescope support structures without compromising performance.
  • The developed composite shell design meets the stringent requirements for next-generation astronomical observatories.