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相关概念视频

Unsymmetric Loading of Thin-Walled Members: Problem Solving01:07

Unsymmetric Loading of Thin-Walled Members: Problem Solving

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The shear center of a channel section with uniform thickness, height, and width, is determined by computing the shear force in the member and calculating the moments of inertia of the sections.
To compute the shear forces, find the shear flow at a specific distance from the endpoint using the vertical shear and the moment of inertia values. The total shear force on the flange is calculated by integrating the shear flow from one end of the flange to the other.
Next, calculate the moments of...
467
Design of Prismatic Beams for Bending01:23

Design of Prismatic Beams for Bending

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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...
591
Lift01:23

Lift

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Lift is a fundamental aerodynamic force that acts perpendicular to the direction of airflow. It plays a central role in achieving and sustaining flight and in stabilizing various vehicles. Lift primarily originates from pressure differences created across surfaces, such as an airfoil. A lower pressure region forms above the wing, while a higher pressure region forms below it, generating an upward force. This differential results from the shape and orientation of the airfoil, enabling the wing...
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Unsymmetric Loading of Thin-Walled Members01:23

Unsymmetric Loading of Thin-Walled Members

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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...
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Flexural Stress01:16

Flexural Stress

657
When analyzing bending in symmetric members, it's crucial to understand how stresses distribute when subjected to bending moments. This stress distribution is effectively described by applying fundamental mechanics and material science principles, particularly Hooke's Law for elastic materials.
Hooke's Law states that within the material's elastic limits, stress is directly proportional to strain. In a member experiencing a bending moment, the strain at any point is relative to its distance...
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Eccentric Axial Loading in a Plane of Symmetry01:16

Eccentric Axial Loading in a Plane of Symmetry

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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.
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相关实验视频

Updated: Jan 8, 2026

Structural Design and Manufacturing of a Cruiser Class Solar Vehicle
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对高度灵活的机翼进行几何非线性高保真航空结构优化.

Alasdair C Gray1, Graeme J Kennedy2, Joaquim R R A Martins1

  • 1Department of Aerospace Engineering, University of Michigan, Ann Arbor, MI USA.

Structural and multidisciplinary optimization : journal of the International Society for Structural and Multidisciplinary Optimization
|December 12, 2025
PubMed
概括

这项研究引入了一种新的方法,可以使用非线性模型同时优化飞机机翼形状和结构. 这种方法准确地解释了高比例翼的极端灵活性,这对于高效的飞机设计至关重要.

关键词:
航空弹性 航空弹性几何非线性是指几何上的非线性.翅膀设计的高视角比率设计.多学科的设计优化.

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科学领域:

  • 航空航天工程 航空航天工程
  • 计算力学 计算力学 计算力学
  • 优化理论 优化理论

背景情况:

  • 多学科设计优化 (MDO) 的进步使得同时使用高保真模型进行空气动力学和结构翼设计.
  • 当前的MDO方法准确地取消了阻力和质量,但在高面积比的翅膀中与几何非线性行为作斗争.
  • 线性结构分析不足以建模下一代飞机机翼的极端灵活性和非线性.

研究的目的:

  • 通过使用高保真度几何非线性模型首次同时优化机翼空气动力学形状和结构尺寸.
  • 开发和实施用于非线性结构分析和气弹性合的计算工具.
  • 研究几何非线性对高度灵活的飞机机翼设计和性能的影响.

主要方法:

  • 实现了一种新的几何非线性外元素,一个高效的非线性解决器,以及硬化外的构成模型.
  • 通过几何非线性转移方案将非线性结构分析与计算流体动力学 (CFD) 结合起来.
  • 一个单通道商用运输飞机机翼的优化,具有547个设计变量和1277个约束.

主要成果:

  • 优化的设计表现出极大的灵活性 (面积比> 19,偏移> 30%半径).
  • 几何非线性对空气动力学性能,平面形状和飞机总体质量的影响最小.
  • 布拉齐尔效应是一种非线性现象,它引入了线性分析所忽略的显著的内部负载,因此需要非线性方法来实现可行的设计.

结论:

  • 开发的框架为设计下一代高比例翼提供了计算基础.
  • 通过几何学非线性分析利用极端的机翼灵活性是设计更高效的飞机的关键.
  • 这项研究可以通过将极端灵活性视为机会而不是约束来追求创新的翼设计.