Person-Worn Safety Device for Worker Fall Detection
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Solution Overview
Problem
Existing safety monitoring systems for field workers are limited in accurately detecting physical translations and falls, and fail to address other potential safety threats, relying on mechanical switches that are not effective in three-dimensional space and do not provide comprehensive worker safety awareness.
Innovation Solution
A self-powered, person-worn safety device equipped with an accelerometer sensor, positioning system, and manually actuable device for bi-directional wireless communication, which uses MEMS sensors to detect falls and activity levels, and environmental gas sensors to alert for hazardous conditions, while providing location tracking and feedback alerts to remote monitoring personnel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mechanical ball-bearing switches are used to detect worker motion, then the device can measure vibration, but it fails to accurately measure physical translation through three-dimensional space
Solution Approach 1:
The patent replaces mechanical ball-bearing switches with electronic accelerometers that use piezoelectric or piezoresistive elements to detect motion. This substitution enables accurate measurement of physical translation through three-dimensional space by measuring acceleration forces along multiple axes, overcoming the limitations of mechanical vibration detection.
Solution Approach 2:
The invention changes the detection parameter from vibration frequency (mechanical switch output) to acceleration magnitude and direction (accelerometer output). This parameter change allows the system to distinguish between vibration and actual physical translation, enabling accurate fall detection and three-dimensional motion tracking.
2Reliability
If workers must periodically check-in via phone or radio, then the system can monitor worker location, but it increases loss of time and reduces productivity
Solution Approach 1:
The safety device automatically monitors and reports worker status without requiring active worker participation. The accelerometers continuously detect motion and the system autonomously determines whether the worker is safe or needs assistance, eliminating the need for periodic manual check-ins while maintaining reliable safety monitoring.
Solution Approach 2:
The system provides continuous automatic feedback to the monitoring center about worker status based on accelerometer data. When no abnormal motion is detected, the system confirms worker safety; when falls or unusual patterns are detected, it immediately triggers alerts, providing reliable monitoring without time-consuming manual check-ins.
3Ease of operation
If mechanical switches are used to detect worker activity, then the alarm timer can be reset, but the device cannot detect worker falls from height
Solution Approach 1:
The patent replaces mechanical switches with electronic accelerometers that can detect the specific acceleration patterns of falls. These sensors measure sudden changes in acceleration vectors that occur during falls from height, providing reliable fall detection capability that mechanical vibration sensors cannot achieve.
Solution Approach 2:
The invention adds three-dimensional acceleration measurement capability to detect falls. By measuring acceleration along multiple axes (x, y, z), the system can identify the characteristic acceleration profile of a fall, including the impact phase and free-fall phase, which cannot be detected by one-dimensional mechanical vibration sensors.
4Reliability
If comprehensive safety monitoring is implemented with multiple sensors, then worker safety awareness is enhanced, but device complexity increases
Solution Approach 1:
The accelerometers serve multiple functions: detecting falls, monitoring worker activity levels, and triggering alarm timers. This multi-functionality reduces the need for separate sensors for each safety function, managing device complexity while enhancing comprehensive safety monitoring capabilities.
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
Enhances worker safety awareness by accurately detecting falls and strenuous activities, providing real-time alerts and location information, and reducing the need for periodic check-ins, while also monitoring environmental hazards and energy consumption, leading to improved emergency response and worker safety management.
Implementation Method 1
an accelerometer sensor for detecting acceleration of the safety device
Implementation Method 2
a positioning system identifying worker position from localized radio signals from terrestrial sources
Implementation Method 3
communicates bi-directionally and wirelessly with a remote receiver system
Data Source
AI summary
A person-worn safety device that communicates bi-directionally and wirelessly with a remote receiver system. An accelerometer sensor detects the worker's activity levels to verify the worker's safety, and identify periods of unduly strenuous activity or undue lack of activity. The system also identifies worker position from localized radio signals from terrestrial sources. A manually actuable lever and button are usable by the worker to indicate a need for assistance. A visual or audio interface allows feedback to the worker originated by the device processor or remote server.