在对称无板中研究非线性羔羊波的零频组件
Xiaoqiang Sun1, Guoshuang Shui2
1College of General Education, Chongqing Industry Polytechnic College, Chongqing 401120, China.
Sensors (Basel, Switzerland)
|August 10, 2024
概括
这项研究表明,零频组件 (ZFC) 是一种比第二波组件 (SHC) 更有效的方法,用于使用非线性Lamb波来检测波状板块的早期损伤.
科学领域:
- 材料科学 材料科学 材料科学
- 非线性声学 非线性声学
- 波浪传播 波浪传播
背景情况:
- 非线性Lamb波由于材料的非线性而产生更高的波和零频组件 (ZFC).
- ZFC或静态位移适用于评估弹性对称波纹板的早期损伤.
- 第二和元件 (SHC) 也显示出损坏监测的潜力,但在波浪结构中面临挑战.
研究的目的:
- 从理论和数值上研究ZFC和SHC的激发机制.
- 用非线性Lamb波传播来描述对称波纹板中的早期材料损伤.
- 为了比较ZFC和SHC在这些结构中检测损坏的有效性.
主要方法:
- 对ZFC和SHC激发机制的理论分析.
- 在波浪板中对非线性兰姆波传播的数值模拟.
- 在损害特征化中对ZFC和SHC性能进行比较研究.
主要成果:
- 无论是ZFC还是SHC,都可以监测波纹板块中早期材料损坏的情况.
- 波浪板中的几何曲率和波干扰阻碍了SHC的传播.
- ZFC表现出独立于结构几何学的累积效应,使其强大.
结论:
- 基于ZFC的检查技术在对称波纹板的早期损伤特征方面更有效和更强大.
- 与SHC相比,ZFC提供了一种更可靠的方法,因为它独立于结构几何和波干扰问题.
相关概念视频
01:28Standing Waves in a Cavity
894
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
894
01:03Modes of Standing Waves - I
2.9K
A close look at earthquakes provides evidence for the conditions appropriate for resonance, standing waves, and constructive and destructive interference. A building may vibrate for several seconds with a driving frequency matching the building's natural frequency of vibration; this produces a resonance that results in one building collapsing while the neighboring buildings do not. Often, buildings of a certain height are devastated, while other taller buildings remain intact. This...
2.9K
01:17Steady, Laminar Flow Between Parallel Plates
158
Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
158
01:04Modes of Standing Waves: II
843
The starting point for expressing the modes of standing waves is understanding the boundary conditions that the waves must follow. The boundary conditions are derived from the physical understanding of how the standing waves are sustained, that is, how the vibrating particles of the medium behave at the boundaries imposed on them.
For a tube open at one end and closed at the other filled with air, the modes are such that there is always an antinode at the open end and a node at the closed end....
For a tube open at one end and closed at the other filled with air, the modes are such that there is always an antinode at the open end and a node at the closed end....
843
01:12Fluid Pressure over Curved Plate of Constant Width
1.6K
When a curved plate of constant width is submerged in a liquid, the pressure acting normal to the plate varies continuously both in magnitude and direction. Calculating the magnitude and location of the resultant force at a point is often challenging for such cases. One of the methods to determine the resultant force and its location involves separately calculating the horizontal and vertical components of the resultant force. This complex calculation can be simplified by representing the...
1.6K
01:27Traveling Waves: Lossless Lines
128
The provided content explores the behavior of traveling waves on single-phase lossless transmission lines. It begins with a single-phase two-wire lossless transmission line of length Δx, characterized by a loop inductance LH/m and a line-to-line capacitance C F/m. These parameters result in a series inductance LΔx and a shunt capacitance CΔx.
128