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Related Concept Videos

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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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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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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Related Experiment Video

Updated: May 9, 2025

Simulation of Human-induced Vibrations Based on the Characterized In-field Pedestrian Behavior
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Novel method for measuring high-frequency wheel-rail force considering wheelset vibrations.

Fubing Zhang1, Hao Wang1, Qihang Zeng2

  • 1School of Intelligent Manufacturing Engineering, Chongqing University of Arts and Sciences, Chongqing, China.

Scientific Reports
|April 29, 2025
PubMed
Summary

This study presents a new method for measuring high-frequency wheel-rail forces using acceleration data and a finite element model. The approach preserves phase information, improving measurement accuracy for critical railway dynamics.

Keywords:
Elastic vibrationFourier transformFrequency response functionHigh-frequency wheel-rail forceIndirect measurement methods

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Area of Science:

  • Mechanical Engineering
  • Railway Engineering
  • Vibrational Analysis

Background:

  • Accurate measurement of high-frequency wheel-rail forces is crucial for railway safety and maintenance.
  • Existing methods may not fully capture the complexities of wheelset dynamics and their impact on measurements.
  • Wheelset vibration modes can significantly influence the accuracy of force measurements.

Purpose of the Study:

  • To develop and validate a novel method for accurately measuring high-frequency wheel-rail forces.
  • To incorporate the effects of wheelset vibration modes into the force measurement process.
  • To enhance the reliability and practical feasibility of high-frequency force measurement techniques.

Main Methods:

  • Utilizing lateral and vertical acceleration data from axle box positions.
  • Employing a finite element model to determine the system's frequency response function.
  • Applying the Fourier transform method to preserve phase information in data processing, avoiding conversion to power spectral density functions.

Main Results:

  • The proposed inverse method successfully determined lateral and vertical wheel-rail forces.
  • Validation through a comparative study showed a close correlation with direct simulation results (5.2kN vs. 5.7kN).
  • The method demonstrated high accuracy and reliability, particularly for high-frequency forces around 580 Hz.

Conclusions:

  • The developed method provides an accurate and reliable approach for gauging high-frequency wheel-rail forces.
  • The incorporation of wheelset vibration modes and phase-preserving data processing significantly enhances measurement precision.
  • This technique offers a practically feasible solution for critical applications in railway dynamics and monitoring.