Development and vibration transmissibility analysis of a biofidelic human brain model

Area of Science:

• Biomechanics
• Neuroscience
• Vibration Analysis

Background:

• Vibrations pose risks to the human brain, linked to neurological damage and traumatic brain injuries (TBI).
• Low-frequency vibrations, common in accidents and sports, can cause resonance, amplifying mechanical stress on neural structures.

Purpose of the Study:

• To investigate the mechanical response and vibration transmissibility of a biofidelic brain model under vertical vibrations (1-12 Hz).
• To establish baseline experimental data for understanding brain vibration dynamics and informing safety research.

Main Methods:

• Utilized a full-scale, multi-part polymeric biofidelic brain model.
• Employed experimental measurements and a simplified mathematical model to analyze vibration transmissibility.
• Tested vertical vibrations within the 1-12 Hz frequency range.

Main Results:

• Observed the first resonance peak between 4-4.2 Hz, consistent with prior research.
• Identified regional transmissibility variations, with higher peaks in the temporal region (approx. 8 Hz) and hemispheric regions (2, 9, 11 Hz).
• Noted an intermediate anti-resonance feature within the hemispheric regions.

Conclusions:

• The developed brain model provides a repeatable platform for studying vibration dynamics.
• Findings highlight the importance of considering regional variations and the influence of surrounding structures (skull, CSF) on vibration response.
• This research contributes to understanding vibration effects on the brain and developing improved models for injury biomechanics research.