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Related Concept Videos

Beams with Unsymmetric Loadings01:17

Beams with Unsymmetric Loadings

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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.
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Deflection of a Beam01:19

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Accurately determining beam deflection and slope under various loading conditions in structural engineering is crucial for ensuring safety and structural integrity. Singularity functions offer a streamlined approach to analyzing beams, especially when multiple loading functions complicate the bending moment equation.
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Beams with Symmetric Loadings01:15

Beams with Symmetric Loadings

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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.
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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...
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Shear on the Horizontal Face of a Beam Element01:16

Shear on the Horizontal Face of a Beam Element

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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...
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The method of superposition is a crucial technique in structural engineering, used to analyze the effect of multiple loads on beams. This approach involves calculating the deflection and slope for each load on a beam separately, and then summing these effects to determine the overall impact. It is applicable only when the beam material remains within its elastic limit, ensuring that deformations are linearly elastic.
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Array-Level Inverse Design of Beam Steering Active Metasurfaces.

Prachi Thureja1, Ghazaleh Kafaie Shirmanesh1, Katherine T Fountaine2

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This study introduces an array-level inverse design for active metasurfaces, enabling precise beam steering. The method optimizes antenna arrays for enhanced performance, overcoming tuning limitations in nanophotonics.

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Area of Science:

  • Nanophotonics
  • Metasurface technology
  • Electromagnetics

Background:

  • Active metasurfaces offer tunable optical properties.
  • Optimizing beam steering in active metasurfaces is challenging due to nonideal phase and amplitude tuning.
  • Existing methods often focus on device-level optimization of passive structures.

Purpose of the Study:

  • To develop an array-level inverse design approach for optimizing active metasurface beam steering performance.
  • To overcome limitations of nonideal tuning in metasurface phase and amplitude.
  • To enable the design of active antenna arrays with variable spatial phase and amplitude profiles.

Main Methods:

  • System-level optimization framework utilizing electrical tunability of identical nanoantennas.
  • Design of active antenna arrays with variable spatial phase and amplitude profiles.
  • Experimental validation using presented device geometries.

Main Results:

  • Demonstrated high-directivity, continuous beam steering up to 70° for phased arrays.
  • Achieved efficient beam steering despite nonidealities like amplitude-phase covariation.
  • Facilitated beam steering with a low phase modulation range (180°) using nonintuitive array profiles.

Conclusions:

  • The proposed array-level inverse design method effectively optimizes active metasurface beam steering.
  • This framework is applicable to various objective functions and active metasurface platforms.
  • The approach enables robust performance in nanophotonic beam steering applications.