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相关概念视频

Eccentric Axial Loading in a Plane of Symmetry01:16

Eccentric Axial Loading in a Plane of Symmetry

165
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.
165
Mechanistic Models: Compartment Models in Algorithms for Numerical Problem Solving01:29

Mechanistic Models: Compartment Models in Algorithms for Numerical Problem Solving

42
Mechanistic models play a crucial role in algorithms for numerical problem-solving, particularly in nonlinear mixed effects modeling (NMEM). These models aim to minimize specific objective functions by evaluating various parameter estimates, leading to the development of systematic algorithms. In some cases, linearization techniques approximate the model using linear equations.
In individual population analyses, different algorithms are employed, such as Cauchy's method, which uses a...
42
Design of Prismatic Beams for Bending01:23

Design of Prismatic Beams for Bending

213
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...
213
Design Consideration01:22

Design Consideration

181
Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
The factor of safety is another key...
181
Plastic Deformations of Members with a Single Plane of Symmetry01:21

Plastic Deformations of Members with a Single Plane of Symmetry

86
When a structural member undergoes plastic deformation due to bending, it is crucial to understand the position of the neutral axis and the stress distribution. This member, characterized by a single plane of symmetry, exhibits a uniform stress distribution, with negative stress above the neutral axis and positive stress below. Notably, the neutral axis does not align with the centroid of the cross-section. This misalignment is typical in cases where the cross-section is not rectangular or...
86
General Case of Eccentric Axial Loading01:12

General Case of Eccentric Axial Loading

173
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...
173

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基于结构参数优化算法的组合轴图设计.

Zongyu Cui, Jiaojiao Ren, Jiyang Zhang

    Optics express
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    此摘要是机器生成的。

    本研究介绍了一种组合轴子设计方法,用于创建高质量的贝塞尔束 (HQ-QBB). 与传统的轴图相比,这种方法可以更好地控制光束属性.

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    科学领域:

    • 光学和光子学 在光学和光子学.
    • 梁成形技术 梁成形技术

    背景情况:

    • 传统的轴子在控制光束特征方面存在局限性,导致诸如高能侧叶和受限制的非衍射区域等问题.
    • 对于先进的光学应用来说,生成具有特定要求的高质量贝塞尔束 (HQ-QBB) 是至关重要的.

    研究的目的:

    • 提出一种新的组合轴图 (CA) 设计方法.
    • 为了使HQ-QBBs生产的结构参数能够精确地定制.
    • 为了克服传统基于轴子的HQ-QBB生成的局限性.

    主要方法:

    • 为CA设计开发结构参数优化算法.
    • 分析生成的HQ-QBB的传输和成像特征.
    • 评估HQ-QBBs的厚样检测能力.

    主要成果:

    • 这种 CA 方法有效地克服了传统轴子的局限性,包括更少的可调节因子和显著的高能侧叶.
    • 生成的HQ-QBB显示出卓越的传输和成像特性.
    • 该方法在厚样本检测中显示了增强的性能.

    结论:

    • 拟议的CA设计方法为生成HQ-QBBs提供了显著的优势.
    • 与现有方法相比,这种方法提供了更大的控制和灵活性.
    • 在当前的研究和未来的光学镜片设计中,CA设计方法具有广泛的适用性.