Lightweight low-profile nine-accelerometer package to obtain head angular accelerations in short-duration impacts

Area of Science:

• Biomechanics
• Neuroscience
• Medical Engineering

Background:

• Angular acceleration is critical for understanding brain injury.
• Previous computational methods using biological models had limited success.
• Accurate measurement of head kinematics is essential for injury assessment.

Purpose of the Study:

• To develop a lightweight, low-profile nine-accelerometer system for head injury evaluations.
• To validate the accuracy of the developed system in human cadaver studies.
• To enhance impact biomechanics testing with precise angular acceleration data.

Main Methods:

• Designed and constructed a triangular pyramidal nine-accelerometer package (PNAP) from aluminum.
• Pre-aligned nine accelerometers within the PNAP for orthogonal accuracy.
• Mounted the PNAP on a human cadaver head and subjected it to impact (8.1 m/s).
• Compared PNAP data with internal measurements from a Hybrid III anthropomorphic test device.

Main Results:

• The PNAP is lightweight (65 g) and low-profile (82 mm base, 35 mm height).
• Impact testing resulted in a peak angular acceleration of 17 krad/s².
• PNAP demonstrated high fidelity and accuracy across high and low angular acceleration levels.
• Validation against the Hybrid III device confirmed PNAP's accuracy.

Conclusions:

• The developed PNAP system is feasible for use in human cadaver head impact studies.
• The PNAP provides accurate angular acceleration data crucial for head injury research.
• This technology enhances the reliability of impact biomechanics testing on biological specimens.