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相关概念视频

Wave Parameters01:10

Wave Parameters

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The simplest mechanical waves are associated with simple harmonic motion and repeat themselves for several cycles. These simple harmonic waves can be modeled using a combination of sine and cosine functions. Consider a simplified surface water wave that moves across the water's surface. Unlike complex ocean waves, in surface water waves, water moves vertically, oscillating up and down, whereas the disturbance of the wave moves horizontally through the medium. If a seagull is floating on the...
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Velocity and Acceleration of a Wave00:51

Velocity and Acceleration of a Wave

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A wave propagates through a medium with a constant speed, known as a wave velocity. It is different from the speed of the particles of the medium, which is not constant. In addition, the velocity of the medium is perpendicular to the velocity of the wave. The variable speed of the particles of the medium implies that there must be acceleration associated with it. 
The velocity of the particles can be obtained by taking the partial derivative of the position equation with respect to time....
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Echo01:06

Echo

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The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case,...
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Shock Waves01:16

Shock Waves

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While deriving the Doppler formula for the observed frequency of a sound wave, it is assumed that the speed of sound in the medium is greater than the source's speed through it. When this condition is breached, a shock wave occurs.
When the source's speed approaches the speed of sound, constructive interference between successive wavefronts emitted by the source occurs immediately behind it. Initially, scientists believed that this constructive interference would result in such high...
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Deriving the Speed of Sound in a Liquid01:09

Deriving the Speed of Sound in a Liquid

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As with waves on a string, the speed of sound or a mechanical wave in a fluid depends on the fluid's elastic modulus and inertia. The two relevant physical quantities are the bulk modulus and the density of the material. Indeed, it turns out that the relationship between speed and the bulk modulus and density in fluids is the same as that between the speed and the Young's modulus and density in solids.
The speed of sound in fluids can be derived by considering a mechanical wave...
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Equations of Wave Motion01:02

Equations of Wave Motion

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Mathematically, the motion of a wave can be studied using a wavefunction. Consider a string oscillating up and down in simple harmonic motion, having a period T. The wave on the string is sinusoidal and is translated in the positive x-direction as time progresses. Sine is a function of the angle θ, oscillating between +A and −A and repeating every 2π radians. To construct a wave model, the ratio of the angle θ and the position x is considered.
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相关实验视频

Updated: Jul 13, 2025

Measurements of Waves in a Wind-wave Tank Under Steady and Time-varying Wind Forcing
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通过测量船舶响应来估计波浪.

Ulrik D Nielsen1, Harry B Bingham2, Astrid H Brodtkorb3

  • 1Department of Civil and Mechanical Engineering, Technical University of Denmark, 2800, Kgs. Lyngby, Denmark. udni@dtu.dk.

Scientific reports
|October 13, 2023
PubMed
概括
此摘要是机器生成的。

船舶可以作为浮标来估计波谱,提供准确,经济高效的海洋数据. 该方法在船的位置提供精确的波浪信息,提高运营效率和安全.

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相关实验视频

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科学领域:

  • 海军建筑和海洋工程.
  • 海洋学和波浪动力学
  • 传感器技术和数据处理数据处理

背景情况:

  • 准确的波浪系统数据对于优化海上运营至关重要,包括能源效率,安全和排放评估.
  • 传统的波浪数据源,如浮标,卫星和模型在时空分辨率和成本方面存在局限性.
  • 船舶具有测量波引起反应的固有能力,为波浪数据采集提供了一种新的方法.

研究的目的:

  • 用船作为波浮标来估计方向波谱的技术概述.
  • 讨论与基于船舶的波频谱估计相关的不确定性.
  • 突出了从测量船只响应中估计波浪的最新进展.

主要方法:

  • 使用经典波浪浮标的类比,处理船舶诱导反应 (运动,结构) 的传感器测量.
  • 采用算法,从收集的船舶响应数据中估计方向波谱.
  • 与现有的波浪数据源 (浮标,卫星,波浪模型) 进行比较分析,以验证基于船舶的方法.

主要成果:

  • 基于船舶的波谱估计提供了船舶位置的精确时空波浪数据.
  • 这种方法比传统的波浪数据采集技术提供了一个潜在的更准确和更具成本效益的替代方案.
  • 该技术证明了可行性,并突出了进一步开发和减少不确定性的领域.

结论:

  • 船舶可以有效地作为平台来估计定向波谱,类似于波浪浮标.
  • 这种方法提供了高分辨率的波浪数据,具有改善海洋运营规划和安全的巨大潜力.
  • 目前正在进行的研究和开发重点是改进船舶波浪估计技术的准确性和可靠性.