Abstract
A new musculoskeletal fatigue model was developed and demonstrated on the prediction of neck musculoskeletal loading and fatigue of fighter pilots during high-G aerial combat manoeuvring (ACM). A whole body articulated multi-body model with detailed neck musculature, representing a 50th percentile male, was utilised in this study. To account for the decrease of muscle force generation capacity during intensive muscle contraction, a new dynamic muscle fatigue model based on a fatigue-rest-recovery mechanism was incorporated to predict muscle fatigue responding to arbitrary neural excitations. Two flight postures, look-ahead and check-6, were investigated on their effects on neck loading during a 6-minute idealised ACM profile. The joint dynamics, muscle forces and fatigue levels, representing the neck biodynamic responses to the applied aircraft acceleration, were obtained and compared for these two postures. Significant differences are observed which show the check-6 posture poses much greater challenge to muscle force generation and induces quicker and severer muscle fatigue.
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