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Development and validation of a computer program to design and calculate ROPS.

J Mangado¹, I Arana, C Jarén

¹Department of Rural Engineering and Projects, Public University of Navarre, Navarra, Spain.

Journal of Agricultural Safety and Health

|March 21, 2007

Summary

Over 250,000 older tractors in Spain lack rollover protective structures (ROPS). A new, tested ROPS design and calculation program (ESTREMA) were developed to enhance tractor safety and prevent operator injury.

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Area of Science:

Agricultural Engineering
Occupational Safety
Tractor Safety

Background:

Over 250,000 tractors in Spain predate mandatory rollover protective structures (ROPS).
Similar safety gaps exist across the EU, US, and developing nations.
Directive 2003/37/EEC allows homologation using OECD Code 4 for static ROPS testing.

Purpose of the Study:

To design and validate a retrofittable ROPS for older tractors.
To develop a computational tool (ESTREMA) for ROPS design.
To ensure operator safety by preventing intrusion into the driver's clearance zone during rollovers.

Main Methods:

A ROPS was designed for the Massey Ferguson 178 tractor using the ESTREMA program.
The designed ROPS underwent homologation testing (OECD Code 4) at an authorized station.
A real-world overturn test was conducted after ROPS redesign and remounting.

Main Results:

The ROPS passed the static homologation test (OECD Code 4).
Maximum distortion was 21.3 cm with 5437 N absorbed energy and 34 kN peak side load.
The redesigned ROPS prevented structural intrusion into the driver's clearance zone during a real overturn.

Conclusions:

The ESTREMA program effectively facilitated ROPS design.
The developed ROPS design meets homologation standards and provides adequate operator protection.
This solution offers a viable safety upgrade for older, unprotected tractors.