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Related Concept Videos

Rolling Resistance: Problem Solving01:17

Rolling Resistance: Problem Solving

919
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...
919

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Repeatability of a dynamic rollover test system.

Jeremy Seppi1, Jacek Toczyski1, Jeff R Crandall1

  • 1a Center for Applied Biomechanics, University of Virginia , Charlottesville , Virginia.

Traffic Injury Prevention
|February 19, 2016
PubMed
Summary
This summary is machine-generated.

This study evaluated the Dynamic Rollover Test System (DRoTS) for vehicle rollover crashes. Despite minor issues, the system demonstrated high repeatability in key crash measurements, crucial for assessing injury risk.

Keywords:
DRoTScrashworthinesskinematicsrepeatabilityrollovervehicle dynamics

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Area of Science:

  • Automotive Safety Engineering
  • Crashworthiness Analysis
  • Biomechanics

Background:

  • Rollover crashes pose significant risks, necessitating accurate testing methods.
  • Evaluating the repeatability of crash test systems is vital for reliable safety assessments.

Purpose of the Study:

  • To characterize rollover crash dynamics.
  • To assess the repeatability of the Dynamic Rollover Test System (DRoTS).
  • To evaluate initial conditions, vehicle kinematics, forces, and deformation.

Main Methods:

  • Conducted four rollover crash tests on sedan and compact multipurpose van (MPV) pairs.
  • Instrumented vehicles with IMUs and string potentiometers.
  • Measured road reaction forces using load cells and velocity with an optical encoder.
  • Utilized laser scans for pre- and post-test vehicle deformation mapping.

Main Results:

  • Initial test conditions showed high repeatability (≤7% difference in key parameters).
  • Vehicle kinematics were generally similar, with minor deviations in sedan and MPV tests attributed to specific issues.
  • Kinetic and deformation measures exhibited a high degree of repeatability.

Conclusions:

  • The DRoTS demonstrates high repeatability for kinetic and deformation measures in rollover testing.
  • Addressing minor issues in test equipment and mass properties will further enhance repeatability.
  • Repeatable testing is essential for accurately assessing rollover injury risk, as roof strength correlates with it.