grain bin entrapment – pressure measurement kevin moore biosystems and agricultural engineering...
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Grain Bin Entrapment – Pressure MeasurementKevin MooreBiosystems and Agricultural EngineeringOklahoma State University
Grain Bin Entrapment• Entrapment – an individual is trapped inside a grain storage
structure and cannot free themselves• Causes• Flowing grain• Collapse of “bridged” grain• Collapse of vertical grain wall• Failure of storage structure
http://www.ag.ndsu.edu/pubs/ageng/safety/ae1102.pdf
Grain Bin Entrapment
http://extension.entm.purdue.edu/grainlab/content/pdf/2013SummaryFinal.pdf
Grain Bin Entrapment
http://www.agriview.com/news/crop/bushels-of-risk-involved-with-flowing-grain/article_da7612f4-2a99-11e2-a78b-0019bb2963f4.html
Objectives• Measure the
pressure on the chest and back of an entrapment victim• Investigate
differences in grain type and depth
Treatments• Four grain depths• Top of shoulders• Top of head• One foot below surface• Two feet below surface
• Four grain types• Soybeans• Wheat • Corn• Canola
Tekscan Pressure Measurement
http://www.tekscan.com/products
Tekscan CONFORMat System• 18.5in x 18.5in sensing
area with 1,024 “sensels”• Sensels are force
sensitive variable resistors• Pressure measurement
at each sensel location• Pressure map
Test Procedure• 1.83m (6ft) hopper bin• Load grain to desired depth, record pressure, unload
grain• Repeat for each replication and depth
Sensor Output
Mean Pressure
Mean Pressure
Calibration Challenges• Required prior to
testing for each grain• Equilibration with
vacuum bladder• Calibration load applied
with Instron • Two point power law
calibration curve in CONFORMat software
Calibration Challenges• Mistake in entering
calibration load• Significant deviation
in results• Calibration is critical
to data quality!
Future Work
• Complete testing with corn and canola• Model behavior with PFC3D• Investigate physiological response to measured
pressures
Funding for this research was supported by the Southwest Center for Agricultural Health, Injury Prevention and Education through Cooperative Agreement #U54-OH7541 from CDC/NIOSH
Questions?