Redundant Mesh Network for Personal Hazard Detection
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Solution Overview
Problem
Existing personal safety devices in industrial settings often fail to reliably alert workers and responders to hazardous conditions due to inconsistent signal strengths and human errors, leading to delayed responses and inadequate situational awareness, especially in environments with extreme temperatures, toxic atmospheres, and rapid hazards.
Innovation Solution
A redundant mesh network of autonomous, portable, position-aware personal safety monitors (APPAPS) that communicate through multiple channels, including ZigBee and cellular telephony, providing continuous hazard alerts and precise location determination using GPS, RSSI, and dead reckoning, ensuring timely and coordinated responses from nearby workers and emergency services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single communication channel is used for hazard alerts, then device complexity is reduced, but reliability of alert transmission deteriorates due to signal blockage or failure
Solution Approach 1:
The patent combines multiple communication channels (ZigBee mesh network, cellular telephony, and direct telephony) into a unified hazard alert system. The APPAPS monitor can transmit alerts through any available channel, ensuring reliable communication even if one channel fails or is blocked. This merging of channels directly resolves the contradiction by maintaining reliability while managing complexity through integrated multi-channel architecture.
Solution Approach 2:
The system dynamically changes communication parameters by selecting different transmission channels based on availability and conditions. When ZigBee mesh is unavailable, the system switches to cellular or direct telephony channels. This parameter changing approach allows the system to maintain reliable alert transmission across varying environmental conditions without requiring all channels to be simultaneously active, thus managing complexity.
2Measurement precision
If GPS and multiple position determination methods are used, then position accuracy is improved, but device complexity and power consumption increase
Solution Approach 1:
The APPAPS monitor is designed with multi-functionality to perform multiple position determination methods (GPS, dead reckoning, and triangulation via ZigBee signal strength) within a single device. This universal approach allows the system to achieve high position accuracy by selecting or combining methods based on environmental conditions, while managing complexity through integrated hardware and software architecture that handles all methods within one device platform.
Solution Approach 2:
The system dynamically selects position determination methods based on available resources and environmental conditions. When GPS signals are strong, the system uses GPS; when in indoor or obstructed environments, it switches to dead reckoning or triangulation methods. This dynamic adaptation allows the system to maintain high position accuracy while optimizing device complexity and power consumption by activating only the necessary positioning methods at any given time.
3Reliability
If redundant communication channels are implemented, then reliability of hazard alert transmission is improved, but loss of time for signal processing increases
Solution Approach 1:
The system performs preliminary actions by pre-configuring multiple communication channels and establishing the ZigBee mesh network topology before hazards occur. Communication protocols and routing paths are pre-established, allowing the system to immediately transmit alerts through available channels when hazards are detected, minimizing signal processing time while maintaining reliability through pre-prepared redundant pathways.
Solution Approach 2:
When a hazard is detected, the system prioritizes rapid alert transmission by skipping non-critical processing steps and using the fastest available communication channel. The system can bypass complex routing decisions and directly transmit alerts through pre-established channels, rushing through the communication process to minimize time loss while still utilizing redundant channels for reliability.
4Loss of information
If APPAPS monitors are required to be position-aware with multiple determination methods, then situational awareness is improved, but ease of operation deteriorates due to frequent updates and data management
Solution Approach 1:
The APPAPS monitor system performs self-service by automatically managing position data and situational awareness information without requiring manual intervention from users. The devices autonomously determine position using multiple methods, track hazard conditions, and maintain awareness of the operational environment. This self-service capability improves situational awareness while maintaining ease of operation, as users simply wear the devices without needing to manage the complex data processing and updates themselves.
Data Source
AI summary
A system for monitoring the safety of personnel on a work site, by providing workers on the site with portable battery powered safety monitors equipped with alarms, sensors to detect hazardous conditions, at least two forms of geo-location and two forms of voice and data telecommunication and two CPU's sharing the computation load, each CPU equipped to monitor and reset the other in case of failure to function, with each monitor capable of serving as a node in a mesh network and relaying information concerning alarms detected including location thereof to other monitors on the mesh network.