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Related Concept Videos

Rolling Resistance: Problem Solving01:17

Rolling Resistance: Problem Solving

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Rolling resistance, also known as rolling friction, is the force that resists the motion of a rolling object, such as a wheel, tire, or ball, when it moves over a surface. It is caused by the deformation of the object and the surface in contact with each other, as well as other factors like internal friction, hysteresis, and energy losses within the materials. Rolling resistance opposes the object's motion, requiring additional energy to overcome it and maintain movement. In practical...
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When a solid cylinder rolls steadily on a rigid surface, the normal force applied by the surface on the cylinder is perpendicular to the tangent at the contact point. However, since no materials are entirely rigid, the surface's reaction to the cylinder involves a range of normal pressures.
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People have observed the rolling motion without slipping ever since the invention of the wheel. For example, one can look at the interaction between a car's tires and the surface of the road. If the driver presses the accelerator to the floor so that the tires spin without the car moving forward, there must be kinetic friction between the wheels and the road's surface. If the driver slowly presses the accelerator, causing the car to move forward, the tires roll without slipping. It is...
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In mechanical engineering, one-degree-of-freedom systems form the basis of a wide range of electrical and mechanical components. Using these models, engineers can predict the behavior of various parts in a larger system, which gives them insight into how different forces interact with each other.
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Related Experiment Video

Updated: Sep 21, 2025

Manufacturing, Control, and Performance Evaluation of a Gecko-Inspired Soft Robot
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A Humidity-Powered Soft Robot with Fast Rolling Locomotion.

Lei Fu1,2, Weiqiang Zhao3,4, Jiayao Ma1,2

  • 1School of Mechanical Engineering, Tianjin University, Tianjin 300350, China.

Research (Washington, D.C.)
|June 2, 2022
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Summary

This study introduces the Hydrollbot, a novel soft robot that uses humidity-sensitive agarose film for self-rolling locomotion. It achieves fast, programmable movement by harnessing energy from evaporation without external stimuli.

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Area of Science:

  • Robotics
  • Materials Science
  • Biomimetics

Background:

  • Soft robotic systems often face challenges in integrating actuators, energy sources, and bodies for efficient locomotion.
  • Achieving fast, programmable trajectories in soft robots under constant environmental conditions remains a significant design hurdle.

Purpose of the Study:

  • To develop a soft robotic system capable of spontaneous, continuous, and fast self-rolling locomotion.
  • To design a robot that operates under constant conditions without external modulated stimuli, harnessing environmental energy.
  • To achieve programmable trajectories and significant payload capacity in a soft robot.

Main Methods:

  • Utilizing a humidity-sensitive agarose film as the core material for the robot.
  • Overcoming isotropic and random bending of the film to enable directed locomotion.
  • Fine-tuning geometric parameters of the agarose film to optimize rolling speed and payload capacity.

Main Results:

  • The developed robot, Hydrollbot, demonstrates spontaneous and continuous fast self-rolling locomotion.
  • The robot harnesses energy from evaporation for movement in a constant-humidity environment.
  • Optimized Hydrollbot achieves programmable trajectories and can carry a payload up to 100% of its own weight.

Conclusions:

  • The Hydrollbot represents a breakthrough in soft robotics, enabling self-propulsion under constant conditions.
  • Its ability to achieve fast, programmable locomotion with payload capacity offers practical advantages for various applications.
  • This design paves the way for advanced applications in sensors, medical robotics, and actuation systems.