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相关概念视频

Buoyancy and Stability for Submerged and Floating Bodies01:11

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In fluid mechanics, buoyancy and stability are key concepts for understanding the behavior of submerged and floating bodies. When a stationary body is fully or partially submerged in a fluid, the fluid exerts a force on the body known as the buoyant force. This force acts vertically upward through a point called the center of buoyancy, which is the center of the displaced fluid volume. According to Archimedes' principle, the magnitude of the buoyant force is equal to the weight of the fluid...
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When an object is placed in a fluid, it either floats or sinks. All objects in a fluid experience a buoyant force. For example, a metal ball sinks, while a rubber ball floats. Similarly, a submarine can sink and float by adjusting its buoyancy.  The concept of buoyancy raises several interesting questions. For instance, where does this buoyant force come from? How much buoyant force is required to make an object sink or float? Do objects that sink get any support at all from the...
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To analyze a hydraulic jump in a rectangular channel with a flow speed of 6 meters per second, follow these steps:Calculate Effective Upstream Velocity:When the downstream gate closes, a hydraulic jump forms, traveling upstream at 2 meters per second. This wave speed combines with the initial channel flow velocity, creating an effective upstream velocity.Identify Flow Velocities Before and After the Hydraulic Jump:Upstream of the hydraulic jump, the effective flow velocity includes both the...
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Flat belts are crucial in many industrial applications as they help transmit power from one pulley to another. The concept of forces and moments is used to determine the maximum moment on a pulley. For instance, consider a flat belt that wraps around two pulleys, A and B, with radii of 30 cm and 10 cm, respectively. The angle between the belt and the horizontal is 20 degrees at the pulleys. As pulley B rotates clockwise and drives pulley A, tension T2 is caused at one end of the belt, while...
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When designing a water slide, controlling the speed of water flow is crucial for rider safety while maintaining an exciting experience. As water flows down the slide, gravity causes it to accelerate, with its speed at the bottom depending on the height from which it starts. The higher the slide, the more potential energy the water has at the top, which is converted into kinetic energy as it descends, increasing its speed.
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非常敏捷的平面游泳机器人

Florian Hartmann1,2, Mrudhula Baskaran3, Gaetan Raynaud3

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一个新的厘米尺度的游泳机器人使用柔软的胸实现了快速,机动,不受束的操作. 这种设计可以在水产养殖场等杂乱的水生环境中进行探索和测量.

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科学领域:

  • 机器人技术 机器人技术 机器人技术
  • 流体动力学 流体动力学
  • 生物模拟学是一种生物模拟学.

背景情况:

  • 水生环境对机器人来说是个挑战,因为它们的环境是无结构的和混乱的.
  • 在水体中有效的导航和数据收集对于水产养殖等应用至关重要.

研究的目的:

  • 开发一个快速,高度机动,厘米尺度的游泳机器人,在复杂的水生环境中进行自主操作.
  • 为了使水生机器人能够有效地运动,沟通和收集能量.

主要方法:

  • 通过一对柔软的,毫米薄的胸和电激发的移动波来实现运动.
  • 每侧一个单一的软电动液压执行器产生推进力.
  • 一个紧的,轻量级的电源供应器使得无线运行,电压和功耗降低.

主要成果:

  • 机器人展示了快速翻译 (5.1厘米/秒) 和旋转 (195°/秒).
  • 它可以在狭窄的空间中航行,穿过草地植物,并推超过自身体重16倍的物体.
  • 通过实验研究和建模确定了优化的尺寸和操作条件.

结论:

  • 开发的游泳机器人提供高性能和机动性,用于探索复杂的水生环境.
  • 潜在的应用包括用于水产养殖和环境勘探的植物和水参数的持续监测.