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Photogrammetric method for measurement of the repose angle of granular…
Photogrammetric method for measurement of the repose angle of granular materials
:
A basic parameter characterizing granular materials is the angle of repose
Angle of repose
: Is the angle between the slant height
and the base of a cone.
This affects in the behavior of a given granular material during transport and discharge
Its a decisive factor in the design of
conveyors and silos
Granular materials are raw materials consisting of solid particles
Some properties of those materials are:
Moisture
Granulometric composition
Shape
Size
Surface texture of particles
The method involves precise positioning of the camera relative to the pile.
Measured using a laser device
as well as being based on the analysis the inclined plane (slant height) of the pile in order to
calculate a regression line
Lacks the analysis of measurement
uncertainty
Digital image photogrammetry has become the dominant and commonly used method
of 3D coordinate measurement.
The authors proposed that the angle of repose might be determined by measuring a selected cone area.
Repose angle determination
The study of how a piled cone is formed
Empyting
Piling
Submerging
Poruing
Rotating
Aereating
The study of how the acquired repose angle is measured
Conclusions
The proposal made was that the angle of repose might be determined by measuring a selected cone
The reduction of repetitions does not influence the overall consistency of a measure.
These studies require further investigation.
Increased measurement reliability of repose angle determination allows detailed
specification of allowable variation in mechanical parts and assemblies
Graphics
Number of repetitions do not affect the medition
Seems to be optimal due to the obtained uncertainty and economic efficiency.
Error between the results were minimun
