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相关概念视频

Beams with Symmetric Loadings01:15

Beams with Symmetric Loadings

219
The moment-area method is an analytical tool used in structural engineering to determine the slope and deflection of beams under various loads. Consider a cantilever with a concentrated load and moment at the free end. The first step is constructing a free-body diagram to calculate the reactions at the fixed end. Next, the bending moment diagram is plotted to visualize how the bending moment varies along the beam's length, focusing on points where the bending moment equals zero.
The M/EI...
219
Beams with Unsymmetric Loadings01:17

Beams with Unsymmetric Loadings

144
Analyzing a supported beam under unsymmetrical loadings is essential in structural engineering to understand how beams respond to varied force distributions. This analysis involves calculating the deflection and identifying points where the slope of the beam is zero, which are crucial for ensuring structural stability and functionality.
The first moment-area theorem determines the slope at any point on the beam. This theorem indicates that the change in slope between two points on a beam...
144
Shear on the Horizontal Face of a Beam Element01:16

Shear on the Horizontal Face of a Beam Element

236
To understand shear on the flat side of a prismatic beam element, consider the vertical and horizontal shearing forces, and the normal forces, acting on the element. The element's upper (U) and lower (L) sections, which are divided by the beam's neutral axis, are examined. The equilibrium of these forces is determined by applying the equilibrium equation, which helps identify the horizontal shearing force. This force is directly related to the bending moments and the cross-section's...
236
Shearing Stresses in a Beam: Problem Solving01:14

Shearing Stresses in a Beam: Problem Solving

243
A cantilever beam with a rectangular cross-section under distributed and point loads experiences shearing stresses. The analysis begins by identifying the loads acting on the beam. Then, the reactions at the beam's fixed end are calculated using equilibrium equations. The vertical reaction is a combination of the distributed and point loads, while the moment reaction is the sum of their moments. The shear force distribution along the beam, resulting from these loads, is established by...
243
Design of Prismatic Beams for Bending01:23

Design of Prismatic Beams for Bending

316
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...
316
Prismatic Beams: Problem Solving01:15

Prismatic Beams: Problem Solving

179
In the design of a supported timber beam subjected to a distributed load, both the beam's physical dimensions and the timber's characteristics, such as its grade and species, are critical. These factors determine the allowable stress values, which are crucial for calculating the necessary beam depth to ensure structural integrity and safety.
The design begins with analyzing the beam as a free body to identify moments and force balances, thereby determining support reactions. Next, the...
179

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Author Spotlight: Introduction to Active Probe Atomic Force Microscopy with Quattro-Parallel Cantilever Arrays
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一个稀缺的共享孔径设计,用于同时发送和接收带有束束限制的阵列.

Dujuan Hu1,2, Xizhang Wei2, Mingcong Xie2

  • 1School of Systems Science and Engineering, Sun Yat-Sen University, Guangzhou 510006, China.

Sensors (Basel, Switzerland)
|July 8, 2023
PubMed
概括

本研究介绍了用于同时发送和接收 (STAR) 阶段阵列的稀疏共享光圈设计,通过束束限制优化性能. 这种新的方法提高了光圈效率,降低了成本,同时保持了高增益和低侧叶水平.

关键词:
束束限制束束束束束束束束束束束阶段式数组的阶段式数组.同时发送和接收.稀疏的共享光圈.

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科学领域:

  • 电磁学和天线理论
  • 信号处理 信号处理
  • 阵列天线设计设计

背景情况:

  • 同时发送和接收 (STAR) 阶段阵列需要先进的配置,以满足苛刻的应用.
  • 有效的数字自我干扰取消对于STAR系统的功能至关重要.

研究的目的:

  • 提出一种新的稀疏共享光圈STAR可重新配置的相位阵列设计.
  • 使用束束约束和遗传算法优化阵列配置.

主要方法:

  • 使用对称的共享光圈设计来提高发射和接收阵列的效率.
  • 集成了稀疏阵列技术,以减少系统复杂性和硬件成本.
  • 使用遗传算法根据侧叶水平 (SLL),主叶增益和光束宽度约束来确定阵列形状.

主要成果:

  • 束束式设计减少了SLL的4.1dBi (传输) 和7.1dBi (接收).
  • 通过减少增益 (1.9 dBi传输,2.1 dBi接收) 和EII (3.9 dB) 的权衡实现了SLL改进.
  • 稀疏度比> 0.78显著改善了SLL抑制,增强减弱最小 (<3dB).

结论:

  • 拟议的稀疏共享光圈设计有效地平衡了STAR相位阵列的高增益,低SLL和成本降低.
  • 束束限制对于优化复杂应用场景中的数组性能至关重要.
  • 遗传算法提供了一种强大的方法,用于根据特定的性能标准设计可重新配置的相位数组.