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Copy of Mechanical Engineering Presentation

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tom bainbridge

on 3 November 2013

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Transcript of Copy of Mechanical Engineering Presentation

202 Mt coal exported
in 2012
Relevant State of the Art
Limitations of Relevant Works to Date
Design & Predict Dozing Experiments
Questions?
8.7 Gt resources remain
Increasing 11% annually
until 2017
Perfect Similitude
Scale only Geometries
Scale tool geometry, depth of cut
Bucket wheel only attempt to date
Scaling Granular media DIFFICULT
Costly, timely, IMPRACTICAL
NASA
Experiment Used Lunar Materials in Testing-Results to be Interpreted Carefully
Static
NO scale tests investigate inertial effects
NO testing investigates large spans of scale
NO scale testing of materials of varying properties
Theory & DEM Preliminary Results to Develop Experiment Apparatus
Data Acquisition for Scale Interrogation
Quantitative
Qualitative
Load Cell - Excavation Force
Strain Gauge - Structural Flexure
Data Logger
Grid-lines on Wall Flush to Blade
Optic Flow Image Clustering
Preliminary Design Results
Geometric Similitude Approach is Looking Promising
Instrumentation Calibration
Why Are We Looking At This?
Routing Efficiencies
Payloads & Crushers
Transport Unloading
Storage - fill/discharge
Stacking & Reclaiming
Excavation &
DOZING
Ship Loading
What Does This Mean To Engineers?
Thomas Bainbridge
Mechanical Engineering Honours Student
James Cook University

May 22nd, 2013
A Bulk Material Handling Scale
Testing Facility

Proving the Concept: Investigating Force & Scale with a Bull Dozing Apparatus
Resource Supply Chain Requires More Efficient Systems, Better Designs
Current Dozer Design Approaches
Queensland Coal Production is Increasing
Minimising Energy and Fatigue/Wear of Systems is Key
1
2
3
Focus of this Thesis
Empirical & Analytical Approaches
Full Scale Experiments
& Prototypes
Numerical Methods
What can a Scaled Testing Facility Offer?
4
Full Scale Typical Mine Strip Dozing
OVERBURDEN
SAND
Power = 550 kW
Velocity = 1 m/s
1:10 Scaled Dozer
Scaled Test Facility Based at JCU Used by: JCU Researchers, Rockfield and 3rd Parties
Power = 55 kW
Velocity = 0.1 m/s
Easily Test Field Conditions in Controlled Experiments
Scaled Testing of Any Bulk Material System
Hugely Flexible
High Value Data
Controllable
Cheap
Repeatable
Two Main Approaches, Perfect & Geometric Similitude
5
Scaled Bucketwheel Results
Results are Promising for the Proof of Concept of a Scale Testing Facility
6
Limitations Generate the Motivations for this Thesis
Testing Lacks Variability Required in Resource Industry
7
8
9
1:1
4:1
9:1
16:1
DEM Results will be Analysed Similarly
Preliminary Results Used to Design Experiments, Apparatus & Later Correlate
10
Dozer Blade Excavation Apparatus(Preliminary)
Only Blade Geometry & Depth of Cut is Scaled
Variables
Bulk Materials
Blade Velocities
Quasi-Static Dynamic
Blade Geometries & Cut Depth
Important to Investigate Both Measurable and Behavioral Aspects of Excavation
11
Digital Photo's/Record
Investigate Scale Relationships to Prove Concept
Correlate Theory, DEM and Physical Phenomena
12
Theory
DEM
Physical Experiments
Develop Force & Scale-Up Relationships
Develop Solid Foundation For Complimentary Work on the Feasibility of a Scaled Testing Facility
Assess DEM Calibration Techniques and Publish more Correlations
?????????
Thank You!!!
Load Cell & Strain Gauges
DEM Calibration
Jenike Shear Cell & Angle of Repose
1.
2.
3.
Preliminary Results Extended
Excavation Work and Power at Critical Scale (Largest Scale 4:1)
:
Existing Scale Test Facility
LC Engineering - Brisbane
concentrate on training
not much design evolution/enhancing
haven' tapped into scheduling/operating efficiencies
limited to draglines and excavators
+
1:1 16:1
+
Quasi-Static
&
Dynamic
Scale Blades
Empirical
DEM
Calibrate
Calculate/Simulate
Preliminary
Design
Results
9
Thesis Supervised by Dr. David Holmes and RTA
Citations available upon request
Scale!!!!
Blade Moves Laterally & Vertically
Rail Tracking System
Full transcript