Design of an anti concussion headgear

Date

2023-4-25

Author

Varol, Alperen

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In this thesis, a FE model of improved boxing headgear is modeled through the implementation of a TVA to reduce the risk of TBI in boxing, a valid human head FE model is constructed, and a boxing hook punch is simulated. A surface-to-surface tied contact is defined between the head components. The human head model is validated by experimental data available in the literature. The neck is modeled by using axial and torsional springs, whose material properties are acquired from the literature. On the human head model, a damping ratio of 5% is added to the model using Rayleigh damping. The protective headgear, glove, and hand are modeled. A TVA is modeled at the tuning frequency of the first natural mode of the head, a torsional motion around the neck. With a known tuning frequency, sweeps of the TVA tuning mass and damping ratio are conducted. The change in the lateral response of the nasal area in FRF plots at TVA tuning frequency is examined. The least response is decided to be most beneficial. For both undamped and Rayleigh-damped models, TVA tuning is conducted. TBI happens when high stress and strain rates occur on the brain tissues, as a result of rapid head movements. The hook punch, which is the most dangerous punch type in boxing in terms of TBI, is simulated. Hook punch simulations are performed on the head model without headgear, with standard headgear, and with TVA-implemented headgear for both undamped and Rayleigh-damped head models. The linear acceleration of the head as well as the rotational movement, velocity, and acceleration are monitored. Three different severity metrics are used in TBI risk calculations: HIC, BrIC, and CM. It is observed that the implementation of the TVA tuned at the first torsional natural frequency of the head on protective headgear does not reduce the risk of TBI effectively.

Subject Keywords

Traumatic brain injury, Boxing, Headgear design, Concussion, Tuned vibration absorber

URI

https://hdl.handle.net/11511/103459

Collections

Graduate School of Natural and Applied Sciences, Thesis