Modeling Of Active Muscle Response Using Feedback Control In Human Head-Neck Model

In various types of traffic accidents, the head and neck of the human body is the most vulnerable part of the trauma. They are often easily severed or fatal injured. Head and neck injury caused long-term sequelae, and even made the injured lose living ability. It brings huge economic burden and mental loss to the community and individuals. Research on the injury mechanism and protection technology of head and neck in traffic accidents is of great significance to the protection of passengers. Head and neck digital model is an important research method to analyze the head and neck injury mechanism and protection technology.The purpose of this paper is to establish a human body Head-Neck finite element model, which was controlled by active muscle and has biological high fidelity and high adaptive ability. We also do front and rear crash simulation to verify the model. We aim to analyze the dynamic response of neck muscles active force on head and neck and impact on neck injury.Firstly, we summarize head and neck injury mechanism and kinematics research in the front and rear collision. Then, we learn human head and neck anatomy knowledge, skeletal muscle micro biomechanics and its constitutive model research. We make improvement to the deficiency existed in target model.According to the neuromuscular control theory, the classical control theory, Hill muscle material properties, we establish the head and neck muscles active force control scheme. We write control program realizes the active muscle force control function in the finite element software simulation by LS-DYNA keyword. We do front and rear crash simulation to confirm the effectiveness of head and neck model by comparing our result with the volunteers test. We apply the human head-neck model with active muscle control to rear impact model to analyze the effect of active muscle force on neck injury.Results show that head and neck model of active muscle force control in before and after collision simulation and the volunteer experimental data have a good agreement, with very high fidelity. Activation level curve obtained through feedback control has good delay, and it can output corresponding activation level according to different states of head and neck. The hybrid dummy after crash injury research shows that, under the same impact strength, the main dynamicmodel with respect to the dynamic model, the damage index value decreased,active muscle force is obvious, which can effectively reduce the risk of neck injury.With the increase of the intensity of the collision, the probability of injury to the neck increases.