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Related Concept Videos

Three-Dimensional Force System:Problem Solving01:30

Three-Dimensional Force System:Problem Solving

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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.
To solve a three-dimensional force system, first resolve each force into its respective scalar components. Do this using...
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Three-Dimensional Force System01:30

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In mechanical engineering, a three-dimensional force system is a system of forces acting in three dimensions, with forces applied along the x, y, and z coordinate axes. The three-dimensional force system is an important concept in mechanical engineering, as it allows engineers to understand and analyze the behavior of objects and structures in three dimensions. By understanding the forces acting on a system, engineers can design more efficient and effective mechanical systems that can withstand...
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Two-Dimensional Force System: Problem Solving01:29

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Solving problems related to two-dimensional force systems is an essential aspect of mechanics and engineering. By applying the principles of vector analysis and force equilibrium, one can determine the effect of multiple forces acting on an object in a two-dimensional space.
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Static and Kinetic Frictional Force01:05

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One of the simpler characteristics of sliding friction is that it is parallel to the contact surfaces between systems, and is always in a direction that opposes the motion or attempted motion of the systems relative to each other. If two systems are in contact and moving relative to one another, then the friction between them is called kinetic friction. For example, kinetic friction slows a hockey puck sliding on ice.
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Two-Dimensional Force System01:20

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A two-dimensional system in mechanical engineering involves the analysis of motion and forces in a plane. A two-dimensional force vector can be resolved into its components as:
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Simplification of a Force and Couple System: II01:23

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In a three-dimensional system, multiple forces can act on an object. These forces can be combined into a single equivalent force, known as the resultant force. Similarly, the moments generated by these forces can be combined into a single equivalent moment, the resultant couple moment. In certain situations, these two entities may not be mutually perpendicular, meaning they do not have a 90-degree angle between them. This unique condition requires a deeper understanding of the interplay between...
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Compliance Model-Based Contact Force Control for Soft Continuum Robots.

Jialei Shi1,2, Sara-Adela Abad2,3, Jian S Dai4,5

  • 1Department of Mechanical Engineering, Hamlyn Centre for Robotic Surgery, Imperial College London, London, UK.

Soft Robotics
|March 28, 2026
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Summary
This summary is machine-generated.

This study introduces a new model-based force control method for soft robots, enabling precise force regulation without complex sensors. The approach uses compliance modeling for adaptable robotic interactions.

Keywords:
compliance modelforce controlpneumatic actuatorssoft continuum robots

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Area of Science:

  • Robotics
  • Control Systems
  • Materials Science

Background:

  • Soft robots require adaptable interaction control for safe operation.
  • Challenges exist in achieving precise force control without feedback sensors.
  • Existing methods often require extensive data or complex feedback loops.

Purpose of the Study:

  • To develop a model-based (quasi-)static force control approach for soft robots.
  • To enable on-demand force control along three Cartesian axes.
  • To avoid reliance on feedback force-sensing devices and extensive training data.

Main Methods:

  • A compliance modeling approach is used to derive the robot's compliance matrix based on its configuration.
  • Desired deflection displacements are calculated to achieve target forces.
  • Inverse kinematics are solved to actuate the robot and generate the forces.
  • Experiments were conducted on one- and two-segment pneumatic-driven soft continuum robots.

Main Results:

  • The proposed approach successfully achieved static force control along three Cartesian axes.
  • Experimental validation demonstrated effective force control performance.
  • Mean control errors were below 5% of the desired peak forces.
  • The method avoids the need for feedback control loops and extensive training data.

Conclusions:

  • The developed (quasi-)static force control approach is effective for soft robots.
  • This method offers a viable alternative for force control in scenarios lacking feedback sensors.
  • The compliance modeling technique provides a robust framework for on-demand force generation in soft robots.