ROPS designs to protect operators during agricultural tractor rollovers

Area of Science:

• Agricultural Engineering
• Occupational Safety
• Mechanical Design

Background:

• Hundreds of agricultural tractor rollover fatalities occur annually in the U.S.
• An estimated 1.6 million tractors lack Rollover Protective Structures (ROPS).
• Existing ROPS may not be commercially available for some tractor models or may not be used correctly.

Purpose of the Study:

• To develop a Computer-based ROPS Design Program (CRDP) for rapid ROPS generation.
• To design and test a foldable ROPS lift assist system.
• To develop and evaluate a model for determining critical ROPS height (CRH).

Main Methods:

• The CRDP generates ROPS designs based on tractor weight and dimensions.
• ROPS designs were tested against SAE J2194 static standards.
• A lift assist mechanism was engineered to reduce ROPS raising and lowering torque.
• A model was developed to calculate CRH using vehicle dimensions and center of gravity.

Main Results:

• CRDP-generated ROPS for the Allis Chalmers 5040 tractor passed SAE J2194 tests.
• The foldable ROPS lift assist reduced raising torque from 90 Nm to under 50 Nm.
• The CRH model was developed and evaluated.

Conclusions:

• The CRDP offers a viable solution for designing effective ROPS.
• The lift assist system enhances the usability of foldable ROPS.
• The CRH model aids in designing safer ROPS for various vehicles.