A NEW NONLINEAR MULTI-BODY DYNAMIC MODEL FOR SIDE-STEP CUTTING SLIP

Abstract

Slipping during side-step cutting maneuvers is a concern for researchers and clinicians, as it increases the risk of falls, sprains and other injuries, especially among athletes. However, the underlying mechanism behind these slip-induced injuries is yet to be explored. With potential injury risk, experimental studies are limited, which restricts our understanding of how and why slips lead to falls. Reliable mathematical models can help analyze, simulate, and diagnose key characteristics of the slipping and falling process. The classic 1-DOF inverted pendulum model in the sagittal plane, commonly used in human walking stability analysis, serves as a valuable example. However, it is overly simplified, neglecting the effects of joint movements and body posture, failing to capture lateral behavior and instability, and not considering environmental factors such as ground friction. To address these limitations, we propose a novel multi-body dynamic model of the human lower limb in the coronal plane to describe and analyze slippage during side-step cutting maneuvers and potential stability loss. The lower limb is modeled as a 2-DOF system, with the hip and ankle joints represented as hinged pairs with specified rotational stiffness. Using Lagrange mechanics and numerical simulations, our model successfully captured lower limb posture and dynamic stability. It exhibits highly nonlinear behavior, including multiple equilibrium positions and transient response. Despite some limitations, our model offers a valuable tool to study slip mechanisms and establishes a strong theoretical foundation for further research on side-step cutting slips.

Publication Title

ASME International Mechanical Engineering Congress and Exposition Proceedings Imece

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