数字和实验研究关于在同otropic 管道中纵向波传播的准静态组件生成
Min Gao1, Xianwen Hu2, Ching-Tai Ng1
1School of Architecture and Civil Engineering, The University of Adelaide, Adelaide, SA 5005, Australia.
Ultrasonics
|January 4, 2024
概括
本研究以数值和实验方式研究管道中准静态元件 (QSC) 生产. 质量控制系统可以检测和评估管道的早期表面腐蚀,显示出明显的趋势,损坏严重程度越来越高.
科学领域:
- 固体力学 固体力学是什么
- 非线性声学 非线性声学
- 材料科学 材料科学 材料科学
背景情况:
- 管道中的纵向波可以表现出非线性行为.
- 准静态元件 (QSC) 由这些非线性相互作用生成.
- 评估材料完整性往往依赖于检测微妙的变化.
研究的目的:
- 通过数值和实验来研究QSCs从同位素管道中的纵向波生成的过程.
- 开发一种使用QSCs评估初始损害的方法.
- 评估QSC在检测和评估管道表面腐蚀方面的有效性.
主要方法:
- 进行了三维 (3D) 有限元素 (FE) 模拟,以分析QSC生成.
- 轴位移激发用于激发L{0,1) 和L{0,2) 模式.
- 一种相位逆转方法提取了QSC脉冲进行分析.
- 开发了一种数据预处理方法和一个非线性声学参数.
- 在一个带有诱导腐蚀水平的管上进行了实验.
主要成果:
- 由L(0,2) 和L(0,1) 模式生成的QSC脉冲被确定为L(0,1) 模式.
- 在管中纵向波的传播被证明可以诱导QSCs.
- 在非线性声学参数和腐蚀严重程度之间观察到单调增加的趋势.
- 质量认证中心成功检测和评估了早期的表面腐蚀.
结论:
- 从纵向波中产生QSC是一种可行的现象,在材料非线性管道中.
- 开发的非线性声学参数有效量化初始损伤.
- 质量检测仪提供了一种有前途的方法,用于对管道表面腐蚀的早期阶段进行非破坏性评估.
相关概念视频
01:24General Characteristics of Pipe Flow II
1.1K
When fluid enters a pipe, it first passes through the entrance region, where the velocity profile adjusts due to viscous effects. In this region, a boundary layer forms along the pipe walls and grows until it fully occupies the pipe's cross-section. Once the boundary layer merges, the flow becomes fully developed, with a steady velocity profile that remains consistent along the pipe's length.
The distance to reach a fully developed flow is called the entrance length and depends on the...
The distance to reach a fully developed flow is called the entrance length and depends on the...
1.1K
01:22General Characteristics of Pipe Flow I
1.2K
Pipe flow refers to the movement of fluids within fully enclosed conduits, typically cylindrical in shape, such as water pipes or hydraulic hoses. These conduits are designed to withstand high-pressure gradients that drive fluid movement, contrasting with open-channel flows, where gravity is the primary driving force. Rectangular conduits, like air conditioning and heating ducts, generally operate at lower pressures and are less suited for high-pressure applications.
The classification of fluid...
The classification of fluid...
1.2K
01:23Steady, Laminar Flow in Circular Tubes
212
Hagen-Poiseuille flow describes a viscous fluid's steady, incompressible flow through a cylindrical tube with a constant radius R. This flow profile is often applied to understand fluid transport in narrow channels, such as capillaries. It serves as a foundational example of laminar flow. In this model, cylindrical coordinates (r,θ,z) are used to describe the radial (r), angular (θ), and axial (z) dimensions within the tube. For Hagen-Poiseuille flow, the velocity profile is...
212
01:30Typical Model Studies
359
Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
359
01:28Major Losses in Pipes
1.1K
When a fluid flows through a pipe, it experiences energy losses due to frictional resistance along the pipe walls, known as major losses. These energy losses result in a pressure drop, which varies based on the flow conditions — whether laminar or turbulent — and the specific physical properties of the fluid and pipe.
Fluid flow can be classified as laminar or turbulent, primarily based on the Reynolds number. This dimensionless number reflects the relative influence of inertial to...
Fluid flow can be classified as laminar or turbulent, primarily based on the Reynolds number. This dimensionless number reflects the relative influence of inertial to...
1.1K
01:09Bending of Material: Problem Solving
186
In this lesson, determine the ratio of the maximum bending moments applied to two metal pipes, given that both pipes can withstand a maximum stress of 100 MPa. Both pipes have an outer radius of 1.8 cm. Pipe A has an inner radius of 1.5 cm, and Pipe B has an inner radius of 1 cm. The ratio of the maximum bending moment applied to two metallic pipes, each with a different inner and outer radius, is determined by considering their dimensions. The inner radius of the first pipe is 1.5 cm, and for...
186