Accuracy of a machine guided grader

Bell, Mitchell (2013) Accuracy of a machine guided grader. [USQ Project]

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Abstract

Machine Guidance is used regularly in construction of roads to aid performance of heavy machinery such as Graders. Machine Guidance technology has the ability to tell the grader operator what height he is cutting to compared to the road design and even control the height of the Graders Blade if required.

This research project analyses the accuracy of a Machine Guided Grader that is used in the formation of roads we use every day. The author demonstrates the accuracy by comparing
heights recorded from the grader to heights surveyed in the field. For ease of use and convenience a Trimble Guided Grader is studied with the most up to date grader control
system. The Trimble Guided Grader is supported by a Trimble SPS930 total station achieving 1” of error in the Vertical and Horizontal circles. Teaming up of both these systems gives the best opportunity for accurate results whilst eliminating the likelihood of bias creeping in.

Modern Trimble Guided Grader technology has the ability to record the finished surface constructed through a simple push of a button. This surface can then be used in quality and production reports replacing the need for a surveyor to manually survey the area every time. Field Tests were carried out using this surface to compare against what is surveyed off the range pole producing a set of differences between the two approaches. Two field tests were carried out with results showing an average difference of 0.3mm in one test and 3.9mm in the second giving the author confidence to conclude that the accuracy generated from a machine guided grader blade was demonstrated to within 4mm of the actual surveyed surface.

The 4mm accuracy demonstrated that opportunities do exist in using the recorded surface as a formal document at times replacing the conformance report that is used for quality assurance purposes. The vision of this occurring would only be achieved through education and research that demonstrated the accuracy to clients like the Department of Transport and Main Roads.


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Item Type: USQ Project
Item Status: Live Archive
Additional Information: Bachelor of Spatial Science project.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Supervisors: Chong, Albert
Date Deposited: 11 Mar 2014 02:31
Last Modified: 19 Jul 2018 00:17
Uncontrolled Keywords: accuracy; machine guided grader; construction; roads
Fields of Research : 09 Engineering > 0909 Geomatic Engineering > 090906 Surveying (incl. Hydrographic Surveying)
09 Engineering > 0909 Geomatic Engineering > 090903 Geospatial Information Systems
URI: http://eprints.usq.edu.au/id/eprint/24711

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