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相关概念视频

Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

163
When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
163
Temperature Dependent Deformation01:12

Temperature Dependent Deformation

147
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
147
Stresses under Combined Loadings01:23

Stresses under Combined Loadings

148
When analyzing a bent tube with a circular cross-section subjected to multiple forces, it is crucial to determine the stress distribution in order to maintain structural integrity under varied load conditions.
The process begins by slicing the tube at critical points and analyzing the internal forces and stress components at these sections, focusing on the centroid. Normal stresses, generated by axial forces and bending moments, are either compressive or tensile and vary across the section from...
148
Method of Joints01:30

Method of Joints

781
The method of joints is a commonly used technique to analyze the forces in structural trusses. The method is based on the principle of equilibrium, which assumes that the truss members are connected by frictionless pins. The forces at each joint can be determined by considering the equilibrium of the forces acting on that joint.
Since plane truss members are in the same plane, each joint is subjected to a coplanar and concurrent force system. To apply the method of joints, the first step is to...
781
Beams with Unsymmetric Loadings01:17

Beams with Unsymmetric Loadings

114
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...
114
Internal Loadings in Structural Members: Problem Solving01:28

Internal Loadings in Structural Members: Problem Solving

1.3K
When designing or analyzing a structural member, it is important to consider the internal loadings developed within the member. These internal loadings include normal force, shear force, and bending moment. Engineers can ensure that the structural member can support the applied external forces by calculating these internal loadings.
To illustrate this, let's consider a beam OC of 5 kN, inclined at an angle of 53.13° with the horizontal and supported at both ends. Determine the internal...
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Author Spotlight: Integrating Mechanical and Biological Analysis in Tendinopathy Research
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Author Spotlight: Integrating Mechanical and Biological Analysis in Tendinopathy Research

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基于PMUT的系统用于持续监测预装螺栓连接的螺栓连接.

Stefano Sanvito1, Marco Passoni2, Domenico Giusti3

  • 1Department of Engineering and Applied Science, University of Bergamo, Via Galvani, 2, 24044 Dalmine, Italy.

Sensors (Basel, Switzerland)
|July 13, 2024
PubMed
概括

这项研究引入了一种新的螺栓预加载监控系统,该系统使用了压电微加工超声波传感器 (PMUT). 该系统测量了声波飞行时间的变化,以准确,低成本,连续的螺栓负载监测.

关键词:
在MEMS MEMS中使用.在PMUTUT中使用.螺栓预装装载 螺栓预装装载螺栓式关节 螺栓式关节 螺栓式关节有限元素方法的有限元素方法.非破坏性测试是指非破坏性测试.压电微加工超声波传感器结构健康监测 结构健康监测超声波超声波是指超声波的使用.

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科学领域:

  • 机械工程 机械工程
  • 材料科学 材料科学 材料科学
  • 传感器技术 传感器技术

背景情况:

  • 在各种工程应用中,螺栓预载对于结构完整性和安全性至关重要.
  • 现有的监测螺栓预装载的方法可能是昂贵的,复杂的,或不适合持续的现场使用.
  • 准确和实时的预装载监控对于防止结构故障和确保运行安全至关重要.

研究的目的:

  • 开发和验证一种新的,低成本的螺栓预装载监测系统.
  • 调查用于测量螺栓预负载的压电微加工超声波传感器 (PMUT) 的使用.
  • 为了证明使用声波飞行时间变化 (CTOF) 来预负载量化声波的可行性.

主要方法:

  • 系统架构设计和算法开发用于螺栓预加载监控.
  • 有限元法 (FEM) 模拟以优化传感器配置和分析波传播.
  • 使用脉冲回声模式的PMUT测量CTOF在不同的负载条件下进行实验验证.
  • 开发一种新型的组装工艺,用于PMUT-螺栓合器的弹性钢声阻抗匹配层.

主要成果:

  • 使用PMUT和CTOF成功测量了螺栓预负载的实验测量,实现了良好的信号噪声比.
  • FEM模拟提供了有关波浪传播的见解,以及各种参数对测量准确性的影响.
  • 证明了新型声学合方法对可靠信号传输的有效性.
  • 首次通过PMUT实现了试验性螺栓预负载测量.

结论:

  • 开发的基于PMUT的系统为螺栓预装载监控提供了一个可行的,低成本的解决方案.
  • 该CTOF测量技术显示了持续,现场监测螺栓完整性的巨大潜力.
  • 该系统的小尺寸和低成本使其适用于整个螺栓使用寿命的广泛现场应用.