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Related Concept Videos

Fluid Pressure01:14

Fluid Pressure

839
In mechanical engineering, fluid pressure plays a critical role in designing systems that utilize liquid flow, such as hydraulic systems, pumps, and valves. When designing these systems, engineers must ensure they can withstand the forces created by fluid pressure to avoid damage or failure.
According to Pascal's law, a fluid at rest will generate equal pressure in all directions. This pressure is measured as a force per unit area, and its magnitude depends on the fluid's specific...
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Pressure of Fluids01:14

Pressure of Fluids

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There are many examples of pressure in fluids in everyday life, such as in relation to blood (high or low blood pressure) and in relation to weather (high- and low-pressure weather systems). A given force can have a significantly different effect, depending on the area over which the force is exerted. For instance, a force applied to an area of 1 mm2 has a pressure that is 100 times greater than the same force applied to an area of 1 cm2. That's why a sharp needle is able to poke through...
17.2K
Hydrostatic Pressure Force on a Plane Surface01:04

Hydrostatic Pressure Force on a Plane Surface

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When a plane surface is submerged in a fluid, hydrostatic forces develop on the surface due to the fluid's pressure. For horizontal surfaces, the pressure exerted by the fluid is uniform because the depth remains constant. The resultant force is determined by the pressure at the given depth multiplied by the area of the surface, and it acts through the centroid of the surface. For vertical surfaces, the pressure varies with depth, increasing as the distance from the fluid's free surface...
679
Pressure Variation in a Fluid at Rest01:11

Pressure Variation in a Fluid at Rest

430
In a fluid at rest, the pressure at any point beneath the fluid surface depends solely on the depth, not on the container's shape or size. This principle, known as hydrostatic pressure, arises because, in stationary fluids, there is no acceleration, meaning the forces within the fluid balance out. Only vertical forces, caused by the weight of the fluid above, contribute to pressure changes with depth.
When measuring pressure at two different levels within the fluid, the difference in...
430
Static, Stagnation, Dynamic and Total Pressure01:24

Static, Stagnation, Dynamic and Total Pressure

673
The concept of static, stagnation, dynamic, and total pressure is fundamental in fluid dynamics, often explained using Bernoulli's equation:
673
Fluid Pressure over Flat Plate of Variable Width01:02

Fluid Pressure over Flat Plate of Variable Width

1.8K
When a flat plate is submerged in a fluid, the fluid exerts pressure on the plate. This pressure can lead to many different phenomena, including drag and buoyancy. To understand the behavior of the fluid over a flat plate of variable width, it is essential to analyze the distribution of the pressure exerted.
The pressure distribution on the plate can be calculated by determining the force that acts on a differential area strip of the plate. Thus, the magnitude of the force is equal to the...
1.8K

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Related Experiment Video

Updated: Oct 3, 2025

Measurement of Dynamic Force Acted on Water Strider Leg Jumping Upward by the PVDF Film Sensor
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Bioinspired dynamic soaring simulation system with distributed pressure sensors.

Danxiang Wang1, Fangfang Xie1, Yufeng Lu1

  • 1Center for Engineering and Scientific Computation, and School of Aeronautics and Astronautics, Zhejiang University, Zhejiang 310027, People's Republic of China.

Bioinspiration & Biomimetics
|February 21, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces a dynamic soaring simulation system using pressure sensors to estimate wind conditions. The system effectively estimates wind velocity and gradient for enhanced flight control.

Keywords:
distributed pressure sensingdynamic soaringsparse sensor placementwind estimation

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Area of Science:

  • Aerospace Engineering
  • Robotics
  • Fluid Dynamics

Background:

  • Dynamic soaring, inspired by albatross flight, offers energy harvesting potential from wind shear layers.
  • Accurate wind estimation is crucial for optimizing dynamic soaring maneuvers and control.

Purpose of the Study:

  • To develop a dynamic soaring simulation system utilizing distributed pressure sensors for wind information estimation.
  • To integrate this system for real-time wind velocity and gradient estimation and subsequent control simulations.

Main Methods:

  • An offline training stage using computational fluid dynamics (CFD) to create a surrogate model correlating flow conditions with surface pressure.
  • An online estimation and control stage employing the surrogate model to infer real-time wind data from pressure sensor inputs.
  • Simulation of dynamic soaring control strategies for linear and circular path-following tasks.

Main Results:

  • The developed system demonstrated acceptable estimation of wind velocity and wind gradient.
  • The pressure-based sensor system successfully correlated local flow conditions with surface pressure.
  • A time delay in estimation was observed, attributed to numerical differentiation processes.

Conclusions:

  • The dynamic soaring simulation system with distributed pressure sensors is a viable approach for wind estimation.
  • The system shows promise for enhancing the control and energy harvesting capabilities of dynamic soaring vehicles.
  • Further refinement is needed to mitigate estimation time delays for improved real-time performance.