Comparative multibody dynamics analysis of falls from playground climbing frames

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Title: Comparative multibody dynamics analysis of falls from playground climbing frames
Authors: Forero Rueda, Manuel A.
Gilchrist, M. D.
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Date: Oct-2009
Online since: 2013-09-25T09:31:31Z
Abstract: This paper shows the utility of multibody dynamics in evaluating changes in injury related parameters of the head and lower limbs of children following falls from playground climbing frames. A particular fall case was used as a starting point to analyze the influence of surface properties, posture of the body at impact, and intermediate collisions against the climbing frame before impacting the ground. Simulations were made using the 6-year-old pedestrian MADYMO rigid body model and scaled head contact characteristics. Energy absorbing surfaces were shown to reduce injury severity parameters by up to 30-80% of those of rigid surfaces, depending on impact posture and surface. Collisions against components of a climbing frame during a fall can increase injury severity of the final impact of the head with the ground by more than 90%. Negligible changes are associated with lower limb injury risks when different surfacing materials are used. Computer reconstructions of actual falls that are intended to quantify the severity of physical injuries rely on accurate knowledge of initial conditions prior to falling, intermediate kinematics of the fall and the orientation of the body when it impacts against the ground. Multibody modelling proved to be a valuable tool to analyze the quality of eye-witness information and analyze the relative injury risk associated with changes in components influencing fall injuries from playground climbing frames. Such simulations can also support forensic investigations by evaluating alternative hypotheses for the sequence of kinematic motion of falls which result in known injuries.
Type of material: Journal Article
Publisher: Elsevier
Journal: Forensic Science International
Volume: 191
Issue: 1-3
Start page: 52
End page: 57
Copyright (published version): 2009 Elsevier
Keywords: impact surfacemultibody modellingmonkey barsinjury severityhead injury
DOI: 10.1016/j.forsciint.2009.06.007
Language: en
Status of Item: Peer reviewed
Appears in Collections:Mechanical & Materials Engineering Research Collection

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