Decoupling Pilot Biomechanics From Control Device Dynamics In Biodynamic Feedthrough: A Multibody Dynamics Approach

Abstract

In human-vehicle interaction, particularly Rotorcraft-Pilot Couplings (RPCs), the Biodynamic Feedthrough (BDFT) assesses the vibration transmission from the base to the control device. In rotorcraft, BDFT is represented as a transfer function, HBDFT, detailing the relationship between seat acceleration and inadvertent control device motion. However, HBDFT depends on both pilot and control device dynamics, challenging design engineers aiming to mitigate RPC impacts on vehicle handling. In this study, a decomposition of HBDFT into separate pilot and control device contributions is assessed using both numerical and experimental approaches. The computational procedure includes a multibody model of the upper body and collective lever, while tests are conducted with specialized setup and the support of the RPC testbed at Politecnico di Milano. Both methods proved effective, validating the approach. This work sets the stage for future research involving diverse individuals to test the model’s predictive capabilities and perform sensitivity analysis, supporting robust helicopter flight control system development.