報告題目: Modeling of human balancing on rolling balance board considering reaction time
報告人：Csenge Andrea Molnár （Department of Applied Mechanics of Budapest University of Technology and Economics，Ph D Student)
Investigation of human balancing is becoming more and more nowadays, because many falls can be connected to the loss of balance. Our goal is to characterize the improvement of balancing ability by repeating a simple and well-defined balancing task five times over a 5-month period. Different stabilometry parameters are used to indicate changes in balancing ability. Improving tendency of the parameters can be observed in case of all balancing subjects, which shows that the balance board is a convenient tool to measure and improve the balancing ability. In order to use a mechanical approach of balancing ability improvement, balancing on rolling balance board in the anterior-posterior plane is analyzed using a two DoF mechanical model, where the human body is modeled by an inverted pendulum and the geometry of the balance board can be adjusted. Human nervous system is assumed to employ a proportional-derivative controller with constant feedback delay identical to the human reaction time. It is shown that a critical feedback delay exists for each geometry of the balance board. If the reaction delay is larger than the critical one, then there are no stabilizing control gains. A numerical algorithm was developed in order to find the critical time delay based on the mechanical model. The numerical results are compared with real balancing trials, and the corresponding feedback delays.
Csenge Andrea Molnár has earned her BSc and MSc degree in mechanical engineering at the Budapest University of Technology and Economics. She is currently a PhD student at the Department of Applied Mechanics. Her research field is the examination of human balancing on balance board, which involves numerical simulation, stability analysis, and measurements.