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Modeling foot trajectories for heavy truck ingress simulation
Digital human figure models are a useful tool for simulation of driver ingress and egress for passenger cars, light trucks, and heavy commercial trucks. Simulation allows evaluation of the suitability of steps and handholds as a system. Accurate simulation requires detailed, validated algorithms to...
A study of the difference between nominal and actual hand forces in two-handed sagittal plane whole-body exertions
Given a task posture, changes in hand force magnitude and direction with regard to joint locations result in variations in joint loads. Previous work has quantified considerable vertical force components during push/pull exertions. The objective of this work was to quantify and statistically model...
Understanding work task assessment sensitivity to the prediction of standing location
Digital human models (DHM) are now widely used to assess worker tasks as part of manufacturing simulation. With current DHM software, the simulation engineer or ergonomist usually makes a manual estimate of the likely worker standing location with respect to the work task. In a small number of...
External landmark, body surface, and volume data of a mid-sized male in seated and standing postures
The purpose of this study was to acquire external landmark, undeformed surface, and volume data from a prescreened individual representing a mid-sized male (height 174.9 cm, weight 78.6 plus or minus 0.77 kg) in the seated and standing postures. The individual matched the 50th percentile value of...
Quantifying cervical-spine curvature using bezier splines
Knowledge of the distributions of cervical-spine curvature is needed for computational studies of cervical-spine injury in motor-vehicle crashes. Many methods of specifying spinal curvature have been proposed, but they often involve qualitative assessment or a large number of parameters. The...
Does Unbelted Safety Requirement Affect Protection For Belted Occupants?
Abstract OBJECTIVE: Federal regulations in the United States require vehicles to meet occupant performance requirements with unbelted test dummies. Removing the test requirements with unbelted occupants might encourage the deployment of seatbelt interlocks and allow restraint optimization to focus...