Redundant Terminal Devices for Track Worker Warning Systems
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Solution Overview
Problem
Existing crew warning systems for track workers are prone to failures, which can lead to critical accidents due to reliance on individual devices, and current solutions do not adequately ensure the highest possible functional reliability without excessive cost.
Innovation Solution
Implementing a communication network among terminal devices to establish redundancy, where each worker carries multiple devices that can monitor each other and output error signals, ensuring that if one device fails, others can alert the worker, and integrating these devices into a central unit or exoskeletons for enhanced visibility and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple terminal devices are used for each crew member, then functional reliability is improved through redundancy, but device complexity and cost increase
Solution Approach 1:
The system divides the warning function into multiple independent terminal devices, where each device can independently detect and warn of approaching trains. This segmentation creates redundancy so that if one device fails, others remain operational, directly resolving the contradiction by improving reliability through device multiplication while maintaining manageable individual device complexity
Solution Approach 2:
Multiple terminal devices are merged into a collaborative network where they communicate with each other via established communication links. The devices share functionality information and coordinate their operation, allowing the system to achieve high reliability through redundancy while the merged network manages the overall complexity rather than each individual device bearing the full burden
2Ease of manufacture
If commercially available terminal devices are used, then cost is reduced, but functional reliability may be insufficient without additional redundancy measures
Solution Approach 1:
The system employs multiple inexpensive commercially available terminal devices rather than relying on a single expensive high-reliability device. Each individual device can be simpler and more cost-effective, but the collective redundancy of multiple devices ensures the required functional reliability is achieved, resolving the contradiction between cost and reliability
Solution Approach 2:
The system proactively addresses potential device failures by implementing redundancy before failures occur. Multiple terminal devices are deployed in advance, and communication links are established beforehand to enable error signal transmission. This prior cushioning ensures that if any device fails, the system maintains reliability without requiring expensive fail-safe mechanisms in each individual device
3Difficulty of detecting and measuring
If terminal devices establish communication links for monitoring, then error detection capability is improved, but system complexity increases
Solution Approach 1:
Terminal devices establish communication links that provide continuous feedback about their operational status to other devices in the network. When a device detects an error or malfunction, it transmits error signals through these communication links, enabling other devices to monitor and detect failures. This feedback mechanism improves error detection capability while the distributed nature of the monitoring keeps individual device complexity manageable
Data Source
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AI summary
The invention describes a track worker warning system with a plurality of terminal devices (E11 ... E42) worn by a track worker (GLA) as equipment, and a central unit (BZT) capable of establishing a communication link (K4) to each of the terminal devices. At least some of the terminal devices are configured to establish a communication link with each other for transmitting a signal relating to functionality and to output an error signal in the event of a malfunction. Furthermore, a method for operating a track worker warning system and a provisioning device are included.