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Related Concept Videos

Vibrating Concrete01:19

Vibrating Concrete

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Mechanical vibrators are instrumental in compacting newly poured concrete within formwork and around reinforcements. This process is essential to eliminate trapped air pockets and establish a dense concrete mass. One widely used method is vibrating by internal vibrators, often referred to as a poker vibrator or immersion vibrator. It is rapidly inserted through the full depth of the freshly laid concrete and slightly extends into the layer below it (which remains in a plastic state). Consistent...
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Concrete in large quantities can be pumped across long distances for placing in inaccessible sites. This system comprises a hopper that receives concrete from a mixer, a pump to propel the concrete, and pipelines that facilitate its delivery.
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Rolling Resistance: Problem Solving01:17

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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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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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Consider a truck trying to pull a stationary car. As the truck exerts a force on the car, static friction is created at the point of contact between the two surfaces. This frictional force resists the car's movement and keeps it at rest. However, when the applied force by the truck surpasses the limiting static frictional force, an interesting phenomenon occurs. The frictional force at the interface reduces to a lower value, known as the kinetic frictional force. At this point, the car...
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Rolling Resistance01:21

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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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Related Experiment Video

Updated: Jun 13, 2025

Kinematic History of a Salient-recess Junction Explored through a Combined Approach of Field Data and Analog Sandbox Modeling
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Robust self-propulsion in sand using simply controlled vibrating cubes.

Bangyuan Liu1,2, Tianyu Wang1,2, Deniz Kerimoglu3

  • 1Institute for Robotics and Intelligent Machines, Georgia Institute of Technology, Atlanta, GA, United States.

Frontiers in Robotics and AI
|September 16, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces self-vibration as a novel locomotion method for robots on granular terrain. This vibratory locomotion offers faster, more stable movement compared to traditional methods on challenging surfaces.

Keywords:
DEM simulationgranular medialocomotionmodular robotrobophysicsrobotvibration

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Area of Science:

  • Robotics
  • Granular Mechanics
  • Vibrational Dynamics

Background:

  • Locomotion on non-cohesive granular terrain is a significant challenge for conventional wheeled and legged robots.
  • Many planetary surfaces and terrestrial environments consist of granular materials, necessitating robust robotic mobility solutions.

Purpose of the Study:

  • To explore self-vibration as an alternative locomotion mechanism for robots on granular media.
  • To investigate the influence of vibration parameters on robot movement across diverse granular terrains and slopes.

Main Methods:

  • Development of a cube-shaped robot equipped with an internal vibratory motor.
  • Systematic experimental analysis of robot locomotion on granular terrains with varying particle properties and slopes.
  • Numerical simulation of a vibrating cube on granular media to understand locomotion principles.

Main Results:

  • Vibratory locomotion demonstrated faster and more stable movement on granular surfaces compared to hard surfaces.
  • Robot movement is facilitated by the interaction between the robot's body and surrounding granular particles.
  • Numerical simulations supported the hypothesis that locomotion arises from oscillations originating from the cube's center of mass.

Conclusions:

  • Self-vibration presents a simple yet effective method for robust robotic locomotion on granular terrains.
  • Cube-shaped robots utilizing vibratory locomotion can serve as modular units for complex robotic systems with enhanced maneuverability.
  • This approach offers a promising alternative for planetary exploration and terrestrial robotic applications in challenging environments.