Off-road vehicles put to the test

Edited by the Engineeringtalk editorial team Sep 11, 2006

Cranfield University has launched its Off-Road Dynamics Facility (ORD) at its Silsoe site in Bedfordshire.

Cranfield University has launched its Off-Road Dynamics Facility (ORD) at its Silsoe site in Bedfordshire.

The facility - the only one of its type in the UK - studies the relationship between machines and the soil environment in controlled conditions, and was officially opened by Richard Parry-Jones CBE, Vice President and Chief Technical Officer at the Ford Motor Company.

The National Soil Resources Institute (NSRI), part of the School of Applied Sciences at Cranfield, developed the GBP 1.5 million facility to expand capability in the area of machine and soil interaction.

The ORD will provide important research information to a number of diverse industries, including motorsport, aviation, agriculture, defence, telecommunications and sports surfaces.

Backed by Land Rover, Claas, Case New Holland (CNH) and Deutz, the ORD facility is based around four unique pieces of equipment developed at Cranfield.

A "whole vehicle" controlled moisture soil lane is the first in the UK.

The soil lane consists of a large open top tank built into the structure of the building to provide a 45m-long, 5m-wide trough into which soil can be placed in a highly controlled and repeatable manner.

The significant width and depth of the soil volume allows the testing of complete off-road vehicles, components or equipment without significant variation.

The water level in this vast bin can be controlled to simulate a range of conditions from the saturated sea-bed encountered in subsea cable laying, through to hard compact dirt roads and airstrips There is a mobile single wheel test apparatus capable of the precise control of wheel torque, vertical load and wheel speed in a wide range of off-road and on-road test environments.

A "variable plane" four wheel articulation rig allows the measurement of wheel load and static thrust across a wide range of axle articulations.

And there is a "smart winch" capable of applying precisely controlled loads up to 100kN on a vehicle.

This equipment, together with related infrastructure, enables the study of off-road vehicle dynamics and soil dynamics, the effect of vehicular movement on the environment and the soil mechanisms associated with soil engaging machinery such as the measurement of tyre performance off-road.

"Simulating extreme off-road environments will help to evaluate any machine that interacts with soil, from rally cars and agricultural machines, to tillage trains and aircraft tyres", explains Professor Dick Godwin, Head of the Engineering Group, NSRI.

"The lab is designed to help industry build vehicles and equipment that optimise their performance".

The Off-Road Dynamics Facility's designer and Project Manager, Dr James Brighton, comments: "Our long-term research aim is to create a precise simulation or indeed a virtual environment for the evaluation of any machine or vehicle configuration in a controlled manner".

"This will improve the accuracy, repeatability and cost-effectiveness of tyre and vehicle dynamics research for off-road vehicles and equipment".