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Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

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When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
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Temperature Dependent Deformation01:12

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In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
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Hydrostatic Pressure Force on a Curved Surface01:04

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Hydrostatic pressure on curved surfaces is a fundamental concept in fluid mechanics with broad applications in the civil engineering field. When fluid is in contact with a curved surface, as in a reservoir, dam, or storage tank, it exerts pressure that varies in magnitude and direction along the curved surface. To assess the total hydrostatic force exerted by the fluid on a curved structure, engineers typically isolate the fluid volume adjacent to the surface and analyze the forces acting on...
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Pressure of Fluids01:14

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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...
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Pressure Variation in a Fluid at Rest01:11

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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.
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Three-Dimensional Force System:Problem Solving01:30

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A three-dimensional force system refers to a scenario in which three forces act simultaneously in three different directions. This type of problem is commonly encountered in physics and engineering, where it is necessary to calculate the resultant force on the system, which can then be used to predict or analyze the behavior of the object or structure under consideration.
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Related Experiment Video

Updated: Nov 19, 2025

Remote Magnetic Actuation of Micrometric Probes for in situ 3D Mapping of Bacterial Biofilm Physical Properties
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Computing Pressure-Deformation Maps for Braided Continuum Robots.

David Navarro-Alarcon1, Omar Zahra1, Christian Trejo1,2

  • 1Department of Mechanical Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong.

Frontiers in Robotics and AI
|January 27, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a new method for computing sensorimotor maps in pneumatic braided continuum robots. The adaptive lattice model simplifies deformation prediction and control for these complex robotic systems.

Keywords:
adaptive systemscontinuum robotsneural networksself-organizing mapssensorimotor models

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Area of Science:

  • Robotics
  • Control Systems
  • Mechanical Engineering

Background:

  • Continuum robots offer unique dexterity but pose challenges in modeling and control.
  • Pneumatic actuation introduces nonlinearities and complexities in robot behavior.
  • Accurate sensorimotor mapping is crucial for predictable robot performance.

Purpose of the Study:

  • To develop an adaptive method for computing sensorimotor maps of braided continuum robots.
  • To represent deformation trajectories using a topology-preserving lattice structure.
  • To facilitate control computation and deformation prediction for systems with unknown properties.

Main Methods:

  • A novel lattice-like representation of the sensorimotor map is automatically generated.
  • Nodes are clustered to preserve input space topology and represent deformation trajectories.
  • The model incorporates an adaptive structure for recalibration.

Main Results:

  • The lattice representation simplifies the representation of deformation trajectories.
  • The method facilitates control computation and prediction of deformations.
  • Experimental validation with a robotic prototype confirms the method's efficacy.

Conclusions:

  • The proposed method provides an effective approach for modeling and controlling pneumatic braided continuum robots.
  • The adaptive lattice structure enhances robustness and adaptability to system changes.
  • This work advances the state-of-the-art in continuum robot control and mapping.