Investigation of Dragline Bucket Instabilities

Reid, Sean (2007). Investigation of Dragline Bucket Instabilities B.Sc Thesis, School of Engineering, The University of Queensland.

       
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Author Reid, Sean
Thesis Title Investigation of Dragline Bucket Instabilities
School, Centre or Institute School of Engineering
Institution The University of Queensland
Publication date 2007
Thesis type B.Sc Thesis
Supervisor Paul Meehan
Total pages 63
Language eng
Subjects 0913 Mechanical Engineering
Formatted abstract
The dynamics of a dragline were investigated to determine whether chaotic instabilities were encountered under realistic operating conditions and what effect an additional two degree’s of freedom have had on this phenomenon. It was found that for the slewing cycle of a standard 1370BE dragline (under unsteady slewing) chaos was first encountered at a forcing torque of »112 MNm and forcing frequency of 0.05 rad/s. This value is out of the reach of current dragline setups but may be encountered in the future as the size of equipment increases.

A comparison was also made between this four degree of freedom model and the simpler models of Meehan and Austin (2005) and Hateley (2006). It was found that this model encountered chaos at larger torque amplitudes than these two models but followed similar trends with respect to bucket position and forcing frequency.

The effect of forcing frequency and bucket position were also investigated and it was found that chaos was more easily avoided at higher frequencies and bucket positions closer to the boom.

A comparison was then done between the results found by Schwarz (2007) and a similar setup using this 4DOF model. The results were found to compare well, giving the impression that Schwarz’s ADAMS/View model would make a useful tool for a more visual simulation of a 2DOF dragline model.

Finally a section on further work was completed which suggested that any further work into this topic should identify any effects from slacking from drag ropes which may cause changes to the system dynamics and hence bucket motion. As well further work was suggested into developing a control system which would use the limits of operation found in this research as its base.
Keyword Dragline Buckets
instabilities

Document type: Thesis
Collection: UQ Theses (non-RHD) - UQ staff and students only
 
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Created: Tue, 23 Dec 2014, 15:14:35 EST by Ahmed Taha Siddiqui on behalf of Scholarly Communication and Digitisation Service