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相关概念视频

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.
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...
149
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
Dynamic Modulus of Elasticity of Concrete01:16

Dynamic Modulus of Elasticity of Concrete

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The dynamic modulus of elasticity assesses how a concrete structure deforms under impact or dynamic loads. It is typically higher than the static modulus of elasticity, measured under slow, steady loading conditions.
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by...
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Impact Loading on a Cantilever Beam01:13

Impact Loading on a Cantilever Beam

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The analysis of a cantilever beam with a circular cross-section subjected to impact loading at its free end illustrates the conversion of potential energy from a dropped object into kinetic energy, which is then absorbed by the beam as strain energy. This process is crucial for understanding how materials behave under dynamic loads, which is important in fields such as construction and aerospace.
When an object is dropped onto the free end of a cantilever, its potential energy due to gravity is...
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Shearing Stresses in a Beam: Problem Solving01:14

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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...
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In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
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纳米复合材料微梁阵列的非线性动态响应用于多重质量传感.

Giovanni Formica1, Walter Lacarbonara2, Hiroshi Yabuno3

  • 1Department of Architecture, Roma Tre University, 33328 Rome, Italy.

Nanomaterials (Basel, Switzerland)
|June 10, 2023
PubMed
概括

本研究以数值方式研究一个非线性微电机系统 (MEMS) 质量传感器. 非线性MEMS传感器由于更大的非线性频率转移,可以提供高达12%的质量检测精度.

关键词:
碳纳米管是如何使用的频率的变化是频率的变化.质量传感器 质量传感器这是一个微型杆微型杆.这是一个纳米复合材料.非线性频率响应是一种非线性频率响应.

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科学领域:

  • * 微电机系统 (MEMS) 是指微电机系统.
  • * 纳米技术的使用
  • * 传感器技术 * 传感器技术

背景情况:

  • *微杆是MEMS传感器的关键组件,但它们的非线性动力学往往被忽视.
  • *纳米结构材料,如碳纳米管 (CNT) 增强的聚合物,提供可调节的特性,以提高传感器性能.
  • *了解非线性频率响应对于提高传感器灵敏度和精度至关重要.

研究的目的:

  • *以数值方式研究非线性MEMS多重质量传感器.
  • * 探索该设备的线性和非线性检测能力.
  • * 评估CNT体积分数对传感器性能的影响.

主要方法:

  • * 单个输入单个输出 (SISO) MEMS传感器的数值调查.
  • *使用非线性欧勒-伯努利束理论与纳米复合材料构成定律建模微型杆.
  • * 在一个减少顺序模型上使用路径跟踪算法来获得频率响应曲线.

主要成果:

  • *通过分析由于质量沉积而导致的频率响应转移来评估传感器的线性和非线性检测能力.
  • * 在共振时非线性频率转移达到了12%.
  • * 调节 CNT 容许调整设备的频带宽的体积分数.

结论:

  • * 非线性MEMS传感器可以显著提高增加质量的检测能力,特别是在更大的位移时.
  • * 拟议的传感器设计采用纳米结构的微型杆,显示了增强的灵敏度.
  • * 该研究强调了MEMS传感器中非线性动态的潜力,用于高精度的质量传感.