Transcript DeFaria-ProgressReport1.pptx

A Kinematic and Dynamic
Analysis of Shoveling Snow
José A. DeFaria
First Progress Report
February 29, 2016
Project Summary
Determine if
ergonomics snow
shovels are effective
in reducing stress in
the lower back.
 A kinematic finite
element analysis will
be completed

Schedule
Phase 1
• Research Snow Shoveling
• Research Human Dimensions / Snow Weights
• Research FEA Modeling of Human Anatomy
Phase 2
• Complete Free Body Diagrams
• Create Finite Element Model
• Present Preliminary Results
Phase 3
• Modify FEA Model as Necessary
• Compile Results into Final Report
Progress
Phase 1
• Research Snow Shoveling
• Research Human Dimensions / Snow Weights
• Research FEA Modeling of Human Anatomy
Research is mostly complete. Sources for human dimensions and snow
weights have been obtained, but to determine which dimensions and weights
will be required the model must be further developed.
At this time the project is on track and the risk for non-completion is low.
Prior Research


Lewinson report measured trunk flexion angles and
showed that angle was decreased using the bentshaft shovel
This should also reduce the moment at the base of
the spine, and therefore, the likeliness of muscle
strain
Model Development
The model which I am currently
considering is a follows. A beam-type
element will simulate the back. It will
be fixed on the bottom. The top will
rotate the bottom until it reaches an
angle which matches the maximum
flexion angle from the Lewinson
report. At that point, the back will
stop moving and the left hand will
lower and the right hand will raise
until a point where the shovel touches
the ground. The snow weight will then
be added to the shovel. The left hand
will raise until it is colinear with the
right hand. The back will then rotate
back until it reaches the 0 degree
point.
Upcoming Work
Phase 2
• Complete Free Body Diagrams
• Create Finite Element Model
• Present Preliminary Results
To stay on track the free body diagrams must be completed within the next
week or so. This will allow for the research to be completed, determining the
relevant weights and dimensions for the FBDs.
The finite element model will also be created in Abaqus. The model will be
of the kinematic variety similar to that used by Beeman in his report.
Additionally, more time will be spent drafting the background and
methodology statements of the report.