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The Effect of Speed on Foldable ROPS Actuation Forces.

Farzaneh Khorsandi1, Paul D Ayers1, Dillan L Jackson1

  • 1University of Tennessee.

Journal of Agricultural Safety and Health
|November 16, 2017
PubMed
Summary
This summary is machine-generated.

Actuation speed significantly impacts foldable rollover protective structure (ROPS) torque, but differences are minor. Understanding these forces is crucial for improving tractor safety and preventing fatalities.

Keywords:
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Area of Science:

  • Agricultural Engineering
  • Occupational Safety and Health

Background:

  • Tractor rollover fatalities persist despite ROPS, particularly with foldable designs (FROPS).
  • Operating tractors in low-clearance areas necessitates folding ROPS, but this is strenuous and often operators leave them folded, increasing risk.
  • Actuation forces for FROPS are not well understood and may depend on speed.

Purpose of the Study:

  • To investigate the effect of actuation speed on the torque required to raise and lower foldable rollover protective structures (FROPS).
  • To develop a theoretical model for predicting FROPS actuation torque.
  • To analyze the practical implications of speed on FROPS operation and safety.

Main Methods:

  • A completely randomized block design experiment was used with two tractor FROPS sizes as blocks.
  • Five speed levels (two static, three dynamic) were tested using a variable-speed motor system.
  • Theoretical modeling and indicator variable regression were employed to analyze actuation torque.

Main Results:

  • Actuation speed was found to have a statistically significant effect on FROPS actuation torque (p > 0.05).
  • Dynamic actuation torques showed statistically significant differences across speeds, but these were negligible compared to static torque differences.
  • Friction influenced dynamic torque, making it higher for raising and lower for lowering than theoretical predictions for one ROPS.

Conclusions:

  • While speed affects FROPS actuation torque, the practical differences are minimal.
  • Friction plays a role in dynamic torque, deviating from theoretical models.
  • Further research into FROPS design and operation is needed to enhance tractor safety.