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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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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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The torque-free motion refers to the movement of a rigid body in space when no external torques are acting upon it. This type of motion can be observed in environments where there are no external forces or frictions, like in outer space. For example, a rotation of Mars in space is a torque-free motion. Mars is an axisymmetric object, meaning it has an axis of symmetry along which it rotates, designated as the z-axis. The rotating frame of reference is defined such that the center of mass of...
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Understanding the calculations and concepts related to double-collar bearings is essential for engineers and designers to optimize the performance of these components in various applications. By analyzing the bearing under different conditions, one can ensure that it can withstand the forces and moments experienced during operation. This knowledge enables better decision-making when designing and selecting bearings for specific purposes and configurations. Consider a double-collar bearing with...
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Updated: Sep 15, 2025

WheelCon: A Wheel Control-Based Gaming Platform for Studying Human Sensorimotor Control
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The WheelCams on the IDEFIX rover.

Naomi Murdoch1, Valérian Lalucaa2, Cecily Sunday1,3

  • 1ISAE-SUPAERO, Université de Toulouse, 10 Avenue Marc Pélegrin, 31055 Toulouse, France.

Progress in Earth and Planetary Science
|July 17, 2025
PubMed
Summary
This summary is machine-generated.

The IDEFIX rover

Keywords:
CameraGeotechnicsIn situ imagingLocomotionMMXMorphologyPhobosRegolithSpace weatheringTerramechanics

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Area of Science:

  • Planetary Science
  • Robotics
  • Geology

Background:

  • The Martian Moons eXploration (MMX) mission includes the IDEFIX rover, designed for low-gravity locomotion on Phobos.
  • Understanding Phobos' surface properties and regolith behavior is crucial for mission success and scientific discovery.

Purpose of the Study:

  • To introduce the IDEFIX WheelCam instrument and its science objectives.
  • To detail characterization activities and preparations for analyzing WheelCam data from Phobos.

Main Methods:

  • Utilizing two cameras (WheelCams) on the underside of the IDEFIX rover to observe wheel-terrain interaction.
  • Analyzing images to study Phobos' surface properties, regolith behavior, and rover mobility.

Main Results:

  • The WheelCams offer a unique perspective on low-gravity locomotion and surface interactions.
  • Data will inform MMX landing/sampling operations and Phobos' geological history.

Conclusions:

  • The IDEFIX WheelCam instrument is essential for understanding Phobos' surface and enabling rover operations.
  • Data analysis preparations are underway to maximize scientific return from the mission.