The postural stability of humans on ship decks can be degraded significantly by the motion environment. Motion-induced interruptions (Mils), that are defined as occasions when a person would have to stop working at their current shipboard task and either change their stance, take a step, or hold onto some convenient anchorage to prevent loss of balance, are often used to quantify the ability of humans to function on the ship in the presence of motion. Currently, the probability of MIT occurrence is most often predicted using a model based on the dynamics of a rigid body having the approximate geometrical and inertial properties of a human resting on the ship deck. This model correlates reasonably well with experimental data though it tends to overestimate the number of MIT occurrences due to the rigid body assumption. This paper presents the development of two articulated postural stability models that include joint articulation at the ankles iii a median sagittal plane model and joint articulation at the ankles and hips in a frontal plane model. Details of the model and controller development as well as sample preliminary results are presented.

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Keywords Biomechanics, Dynamic interface analysis, Four-bar linkage, Inverted pendulum, Postural stability, Ship motion
Conference 2003 Summer Computer Simulation Conference, SCSC 2003
Citation
Wedge, J. (Joyce), & Langlois, R.G. (2003). Simulating the effects of ship motion on postural stability using articulated dynamic models. Presented at the 2003 Summer Computer Simulation Conference, SCSC 2003.