Balance in dynamic situations: role of the underlying model

摘要: Modeling balance in dynamic situations is a very difficult topic. One of the most popular ways to study consists analyzing position center pressure COP and projection mass COM on floor. The relative displacements have been widely studied quasi-static thanks measurements coupling force plate motion capture system. However, motions, these points seem fail correctly determine when subject should fall without initiating another (such as stepping). Recently, some authors [1] introduced new point called “extrapolated COM” xCOM that takes velocity into account for predicting unbalanced movements. If goes beyond base support, it’s not possible select where ground reaction could compensate situation. Hence, status involves measuring three variables: COM, xCOM. In robotics, controlled through Zero Moment Point ZMP [2] which defined tipping moments about forward sideward axis acting system, due gravity inertia forces, are equal zero. For flat grounds if only exerted subject, located at same place [3]. Hence be good predictor location no available. modelling human body mechanical system always includes simplification therefore lead inaccuracies. This paper aims comparing actual with computing based two different models: using simple pendulum particles.