Determining Mass Centre Trajectory Variations for Application to Human Modelling

R.H. Mitchell, A.I.T. Salo, and A.J. Medland (UK)

Keywords

: Experiments and modelling, sit-to-stand,constraint modelling, balance.

Abstract

Of the numerous man-model packages available for ergonomic evaluation, few have the capacity to correctly recreate human movement patterns under differing conditions without intervention from skilled operators. A manikin has been created within SWORDS, a constraint based modeller that produces unique movement patterns based on the conditions under which a movement occurs. For application to the manikin, this study established variations that occur in the mass centre horizontal trajectory due to changes in pace, posture and seat height, during sit-to-stand. Variations were considered in terms of events that occur throughout the motion. Regression equations were used in order to predict the occurrence of events under different conditions, and a mass centre trajectory was created by fitting a curve to the events.

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