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Related Concept Videos

Beams01:30

Beams

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Beams are integral components of structural engineering and construction, designed to support loads applied at various points along their length. These long, straight members can be classified based on geometry, cross-section, support type, and equilibrium condition.
Based on geometry, beams can be straight, tapered, or curved. Straight beams are the most common type and have a constant cross-section throughout their length. Tapered beams, on the other hand, have a varying cross-section along...
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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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Prismatic Beams: Problem Solving01:15

Prismatic Beams: Problem Solving

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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.
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Principal Stresses in a Beam01:11

Principal Stresses in a Beam

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In prismatic beams subject to arbitrary transverse loading, It is essential to analyze the interaction between shear forces and bending moments in order to understand stress distribution and ensure structural integrity. The highest normal or bending stress occurs at the outer fibers of the beam, decreasing linearly to zero at the neutral axis. In contrast, shear stress peaks at the neutral axis and diminishes toward the outer surfaces.
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Beams with Symmetric Loadings01:15

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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.
The M/EI...
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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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One-way Acoustic Beam Splitter.

Yifan Tang1, Yifan Zhu1, Bin Liang2

  • 1Key Laboratory of Modern Acoustics, MOE, Institute of Acoustics, Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China.

Scientific Reports
|September 13, 2018
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel one-way acoustic beam splitter (BS) that directs sound from an input port to multiple output ports while blocking backward transmission. This asymmetric acoustic device offers flexible control over output beams, advancing acoustic technologies.

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Area of Science:

  • Acoustics
  • Wave Physics
  • Materials Science

Background:

  • Conventional acoustic beam splitters (BS) assume bidirectional wave propagation.
  • Existing BS designs lack asymmetric transmission capabilities, limiting their application in advanced acoustic systems.

Purpose of the Study:

  • To propose and demonstrate a one-way acoustic beam splitter (BS) with asymmetric transmission.
  • To enable flexible control over the number and angles of output acoustic beams.

Main Methods:

  • Conceptual design of a one-way acoustic BS utilizing line defects.
  • Numerical simulations to verify theoretical predictions and demonstrate asymmetric transmission.
  • Method for adjusting output beam characteristics by blocking unused line defects.

Main Results:

  • Successful demonstration of a one-way acoustic BS capable of splitting input acoustic beams into multiple outputs.
  • Significant reduction in backward transmission from output ports to the input port.
  • Flexible adjustment of the number and angles of output beams was achieved.

Conclusions:

  • The proposed one-way acoustic BS overcomes the limitation of symmetric transmission in conventional devices.
  • This design offers functionality and flexibility, bridging the gap between acoustic diodes and BSs.
  • Potential applications include advanced acoustic integrated circuits and acoustic communication systems.