Protective Headgear Sensor System for Impact Severity Assessment
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Solution Overview
Problem
Conventional systems for monitoring protective headgear lack comprehensive and accurate detection of impact events, often relying solely on acceleration data, which can lead to false positives and fail to account for the severity of impacts, particularly in cases where mass or momentum are involved.
Innovation Solution
A system comprising a wireless device mounted on protective headgear that includes both accelerometers and gyroscopes, generating event data that combines linear and rotational acceleration, and processing this data to calculate power and energy dissipation rates, which is then transmitted to a handheld device for further analysis and simulation of impact events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only acceleration data is used for impact detection, then the system complexity is reduced, but the measurement precision and reliability of impact severity assessment deteriorates
Solution Approach 1:
The patent combines multiple sensor types (accelerometers and gyroscopes) into a unified impact detection system. The accelerometers measure linear acceleration while gyroscopes measure rotational acceleration, and both data streams are integrated to comprehensively assess impact severity, thereby improving measurement precision without excessive complexity increase
Solution Approach 2:
The sensor system is designed to perform multiple functions: detecting linear impacts via accelerometers, detecting rotational impacts via gyroscopes, and providing comprehensive impact characterization. This multi-functional approach enables accurate assessment of various impact types using a single integrated system
2Measurement precision
If acceleration threshold is set low to detect mild impacts, then the sensitivity is improved, but false positives increase due to normal movements
Solution Approach 1:
The system continuously monitors sensor data and uses feedback mechanisms to distinguish between normal movements and actual impacts. By analyzing patterns in acceleration and rotational data over time, the system can differentiate between benign movements and genuine impact events, reducing false positives while maintaining sensitivity
Solution Approach 2:
The patent adds rotational acceleration measurements from gyroscopes as an additional dimension to the traditional linear acceleration data. This extra dimension enables better discrimination between normal movements (which typically lack significant rotational components) and actual impacts, thereby reducing false positives while maintaining detection sensitivity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach provides a more comprehensive and accurate assessment of impact severity by considering both linear and rotational acceleration, reducing false positives and enabling more precise monitoring of potential head injuries.
Implementation Method 1
A sensor module that generates sensor data in response to an impact to the protective headgear
Implementation Method 2
The sensor module includes an accelerometer and a gyroscope and wherein the sensor data includes linear acceleration data and rotational velocity data
Data Source
AI summary
A wireless device includes a sensor module generates a wake-up signal and sensor data in response to motion of protective headgear, wherein the sensor data includes acceleration data. A device processing module generates event data in response to the sensor data. A short-range wireless transmitter transmits a wireless signal that includes the event data. A power management module selectively powers the short-range transmitter and the device processing module in response to the wake-up signal.