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相关概念视频

Bending of Material: Problem Solving01:09

Bending of Material: Problem Solving

173
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...
173
Multiple Pipe Systems01:21

Multiple Pipe Systems

518
Multipipe systems consist of complex configurations of interconnected pipes designed to transport fluids efficiently across intricate networks. They are essential in engineering applications requiring precise control over flow distribution, pressure, and head loss. They are categorized into series, parallel, loop, and network configurations, each distinguished by unique flow characteristics and applications.
Series Configuration
In a series configuration, fluid flows sequentially from one pipe...
518
Stresses under Combined Loadings01:23

Stresses under Combined Loadings

146
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...
146
Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

165
Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
165
Cable Subjected to Its Own Weight01:13

Cable Subjected to Its Own Weight

432
Overhead power transmission lines rely on cables to carry electricity across large distances. To ensure the stability and functionality of these lines, it is crucial to understand the shape and tension experienced by the cables under the influence of their weight.
A generalized loading function is employed to analyze a cable subjected to its own weight. This function considers the force acting along the cable's arc length rather than its projected length, providing a more accurate...
432
Single Pipe Systems01:24

Single Pipe Systems

110
In pipe flow analysis, problems are typically categorized into three types — Type I, Type II, and Type III — based on the known parameters and the desired outcome. Each type of problem addresses specific engineering requirements using fluid properties, pipe characteristics, and operational conditions.
In a Type I problem, fluid properties (density and viscosity), pipe characteristics (including diameter, length, and surface roughness), and the flow rate or average velocity are...
110

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相关实验视频

Updated: Jun 11, 2025

Visualization of Flow Field Around a Vibrating Pipeline Within an Equilibrium Scour Hole
00:09

Visualization of Flow Field Around a Vibrating Pipeline Within an Equilibrium Scour Hole

Published on: August 26, 2019

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编织品及其他:从PREMIER数据中对管道设备编织品稳定性的综合研究.

Fernanda Rodriguez-Erazú1,2, Gustavo M Cortez1,3, Demetrius K Lopes4

  • 1Lyerly Neurosurgery, Baptist Medical Center Downtown, Jacksonville, Florida, USA.

Journal of neurointerventional surgery
|October 2, 2024
PubMed
概括

管道栓塞装置 (PED) 在早期几代人中表现出极好的编织稳定性,罕见的变形不会影响脑动脉瘤治疗的安全性或有效性. 长期随访证实了设备的完整性.

关键词:
动脉瘤是一个动脉瘤.血管学 血管学 血管学流量转换器 流量转换器狭窄症 (英语:Stenosis) 是一种缩小症.

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Mechanical Expansion of Steel Tubing as a Solution to Leaky Wellbores
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Mechanical Expansion of Steel Tubing as a Solution to Leaky Wellbores

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A Cost-effective and Reliable Method to Predict Mechanical Stress in Single-use and Standard Pumps
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相关实验视频

Last Updated: Jun 11, 2025

Visualization of Flow Field Around a Vibrating Pipeline Within an Equilibrium Scour Hole
00:09

Visualization of Flow Field Around a Vibrating Pipeline Within an Equilibrium Scour Hole

Published on: August 26, 2019

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Mechanical Expansion of Steel Tubing as a Solution to Leaky Wellbores
09:32

Mechanical Expansion of Steel Tubing as a Solution to Leaky Wellbores

Published on: November 20, 2014

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A Cost-effective and Reliable Method to Predict Mechanical Stress in Single-use and Standard Pumps
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科学领域:

  • 内血管神经外科手术 血管内血管神经外科
  • 医疗器械技术 医疗器械技术
  • 脑血管疾病管理的管理

背景情况:

  • 人们对新一代的管道栓塞装置 (PED) 使用绘制填充管道技术的编织稳定性存在担忧.
  • 对于治疗内动脉瘤,PED越来越多地被采用.

研究的目的:

  • 在PREMIER临床试验中,评估早期一代PED设备 (Classic和Flex) 的编织稳定性.
  • 评估PED在动脉瘤治疗中的长期安全性和有效性.

主要方法:

  • 在PREMIER试验中,用PED (Classic和Flex) 治疗的内动脉瘤的回顾性分析.
  • 评估编织稳定性 (鱼口,缩短,编织撞击,崩) 使用立即后过程和1年和2年的随访成像 (形光束CT和血管造影).
  • 评估安全性 (修改的兰金尺度,血管狭窄) 和有效性 (雷蒙德-罗伊尺度,再处理率).

主要成果:

  • 有133/141个动脉瘤的完整数据集;6% (8/133) 呈现出形变形.
  • 形变形与静脉支架狭窄症>50% (P=0.029) 有关,但没有影响整体安全性或有效性.
  • 具体的变形包括鱼口 (0.75%),前缩 (4.5%),凸 (0.75%),其中一种鱼口导致>50%的狭窄.
  • 在2年的随访期间,没有观察到新的编织稳定性问题;由于新极度增生症的无症状狭窄发生在3.0%的无编织变化中.

结论:

  • 管道栓塞装置 (Classic和Flex) 在PREMIER试验队列中表现出极好的编织稳定性.
  • 观察到的变化很少发生,并且不会影响动脉瘤治疗装置的安全性或疗效.