Wearable Sensor Tag for Improper Bending Detection
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Solution Overview
Problem
In workplace settings, workers often sustain back injuries due to improper bending motions while handling heavy objects, and it is challenging to monitor hundreds of workers effectively to prevent such injuries.
Innovation Solution
A wearable sensor system that includes a sensor tag with an accelerometer to measure three-dimensional acceleration data, which is processed to distinguish between correct and incorrect bending motions, providing real-time feedback to the user.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If close monitoring of workers is implemented to detect improper bending motions, then worker safety is improved, but the complexity and cost of the monitoring system increases significantly
Solution Approach 1:
The monitoring system is segmented into individual wearable tags, each independently monitoring one worker. This modular approach allows the system to scale to hundreds of workers without proportionally increasing central system complexity, as each tag operates autonomously with onboard processing capabilities.
Solution Approach 2:
Each wearable tag incorporates onboard processing that autonomously analyzes accelerometer data to detect improper bending motions. The tag independently generates alerts without requiring continuous central system intervention, enabling self-service operation that reduces overall system complexity while maintaining reliable safety monitoring.
2Measurement precision
If manual monitoring of worker bending motions is performed, then detection accuracy is improved, but the productivity and scalability of the workforce decreases
Solution Approach 1:
The patent replaces manual visual monitoring with electronic accelerometer-based detection. The wearable tag uses accelerometers to automatically measure and analyze bending motions, providing precise detection without requiring human observers. This substitution eliminates the trade-off between detection accuracy and productivity, as the electronic system maintains high precision while having zero impact on workforce productivity.
Solution Approach 2:
The wearable tag acts as an intermediary device between the worker and the monitoring system. It captures acceleration data, processes it locally to detect improper bending, and transmits only relevant alerts. This intermediary approach maintains high detection accuracy while minimizing disruption to worker productivity by requiring minimal attention from the workers themselves.
3Reliability
If continuous monitoring of all workers is implemented, then injury prevention is improved, but the cost and resource requirements of the system increases
Solution Approach 1:
The system employs periodic sampling of acceleration data at optimized intervals rather than continuous high-rate monitoring. The onboard processor analyzes data periodically to detect improper bending motions, maintaining effective injury prevention while reducing computational resource consumption and extending battery life of wearable tags.
Solution Approach 2:
The wearable tag continuously monitors acceleration data but only triggers full analysis and alerts when suspicious motion patterns are detected. This partial action approach processes only the necessary portion of data at high detail, maintaining effective injury prevention while conserving computational and energy resources during normal operation.
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
The system effectively reduces the risk of workplace injuries by accurately detecting improper bending motions and providing immediate feedback, thus promoting safer work practices.
Implementation Method 1
a sensor worn by an individual; the sensor data containing three-dimensional acceleration information corresponding to movement of the individual
Data Source
AI summary
A system includes a sensor attached to an individual and detects an individual's improper body movements that increase injury risk. The system includes a safety tag with an accelerometer that measures proper acceleration. Proper acceleration along multiple directions are projected onto multiple 2-D planes, generating acceleration vectors. Phasor angles of the acceleration vectors are calculated, and if the spread in phasor angles for any one 2-D plane within a moving time window exceeds a threshold, the system determines that the individual has made an improper body movement.