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相关概念视频

Distributed Loads: Problem Solving01:21

Distributed Loads: Problem Solving

624
Beams are structural elements commonly employed in engineering applications requiring different load-carrying capacities. The first step in analyzing a beam under a distributed load is to simplify the problem by dividing the load into smaller regions, which allows one to consider each region separately and calculate the magnitude of the equivalent resultant load acting on each portion of the beam. The magnitude of the equivalent resultant load for each region can be determined by calculating...
624
Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

27
Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short...
27
Distributed Loads01:19

Distributed Loads

511
Distributed loads are a common type of load that engineers and scientists encounter in various practical situations. Distributed loads often refer to a type of load spread over a surface or a structure and can be modeled as continuous force per unit area.
For example, consider a bookshelf filled with books stacked vertically adjacent to each other. The weight of the books is evenly distributed over the length of the shelf. As a result, the pressure at different locations on the surface of the...
511
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

915
Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
915
Discrete Fourier Transform01:15

Discrete Fourier Transform

219
The Discrete Fourier Transform (DFT) is a fundamental tool in signal processing, extending the discrete-time Fourier transform by evaluating discrete signals at uniformly spaced frequency intervals. This transformation converts a finite sequence of time-domain samples into frequency components, each representing complex sinusoids ordered by frequency. The DFT translates these sequences into the frequency domain, effectively indicating the magnitude and phase of each frequency component present...
219
Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

389
Consider a crane whose telescopic boom rotates with an angular velocity of 0.04 rad/s and angular acceleration of 0.02 rad/s2. Along with the rotation, the boom also extends linearly with a uniform speed of 5 m/s. The extension of the boom is measured at point D, which is measured with respect to the fixed point C on the other end of the boom. For the given instant, the distance between points C and D is 60 meters.
Here, in order to determine the magnitude of velocity and acceleration for point...
389

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相关实验视频

Updated: Jun 6, 2025

Simulation of Human-induced Vibrations Based on the Characterized In-field Pedestrian Behavior
10:52

Simulation of Human-induced Vibrations Based on the Characterized In-field Pedestrian Behavior

Published on: April 13, 2016

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远距离向前传输的多点振动定位方法分布式振动传感器

Xing Rao, Shangwei Dai, Ming Chen

    Optics express
    |November 22, 2024
    PubMed
    概括

    这项研究表明,使用电信光纤电缆进行海底监控. 新方法精确地定位多个同时发生的振动,增强地质和海事监测能力.

    科学领域:

    • 地质物理学和海洋学
    • 光学传感和通信技术

    背景情况:

    • 海底光纤电缆为监测地震和海等海底事件提供了独特的机会.
    • 现有的传感方法在空间分辨率和区分多个同时发生的事件方面存在局限性.

    研究的目的:

    • 开发和验证使用现有的海底光纤电缆进行远距离振动检测的分布式传感系统.
    • 为了提高区分和量化多个同时发生的振动事件的能力.
    • 为了克服传统的时间域采样率所造成的空间分辨率限制.

    主要方法:

    • 对海底光缆和不受保护的光纤上的外部物理干扰进行比较分析.
    • 实施基于强度和相变调的传感系统,用于振动传感.
    • 扩展相谱时间延迟方法用于前向传输分布式传感.
    • 在202.3公里的单跨传感距离上进行实验演示.

    主要成果:

    • 成功的多振动定位,正弦波振动的精度低至17.9米.
    • 实现了1.25米的空间分辨率,超过了以前的基本限制.
    • 已证明的相位灵敏度为40.6mrad/με,强度灵敏度为7.1%/με.
    • 测试频率范围为0.01-100Hz,具有实时处理能力.

    更多相关视频

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    结论:

    • 前向传输方法可以将全球互联网光纤网络转化为大型海洋观测网络.
    • 这项技术允许加强海底事件监控,而不会影响现有的电信运营或带宽.
    • 开发的系统为实时,高分辨率的海洋环境监测提供了巨大的潜力.