Revolutionizing Urban Rail Transit Vehicle Maintenance with RFID Technology

From the aspects of on-site personnel safety management,unmanned material management, dynamic management of tools,equipment and emergency devices,monitoring of running gear,undercarriage high-voltage components and cable temperature monitoring,and full lifecycle management of vehicle components,the 'pain points' in the operation-management process of urban rail transit vehicle maintenance discipline are summarized. The working principle and technical characteristics of RFID technology is briefly introduced,along with the composition of an information platform for vehicle maintenance discipline based on RFID technology. 

The application layer of the platform is introduced in detail,including the personnel monitoring subsystem,unmanned material management subsystem,dynamic management subsystem for tools,equipment,and emergency devices,temperature monitoring subsystem,and the vehicle full lifecycle record management subsystem. Key issues related to the application of RFID technology in vehicle maintenance discipline information construction are discussed,such as electronic tag selection and installation,and electronic tag installation cost reduction.

RFID technology is a reader-writer that sends a radio frequency signal of a certain frequency through an antenna. When the electronic tag enters the antenna working area, an induced current is generated. At this time, the electronic tag gains energy and is activated and sends its own code and other information through the built-in transmitting antenna of the electronic tag. , after the electronic tag reading sensing system receives the carrier signal sent from the electronic tag, it is transmitted to the reader through the antenna adjuster and demodulates and decodes the received signal.

Electronic tags produced based on RFID technology are highly durable and have a theoretical lifespan of more than 30 years. The COS (on-chip operating system) inside the electronic tag chip itself adopts a safe system design and is not easy to be counterfeited. Electronic tags are low in cost and small in size, and can be installed on the surface of any object in different ways. When working, electronic tags can identify high-speed moving objects at long distances and identify multiple targets at the same time. Electronic labels generate unique codes during the production process and cannot be modified, which is of great help in traceability and anti-counterfeiting. Repeated reading and writing can be performed on the designated memory, and the reusability is high.

RFID technology allows people carrying RFID tag cards to quickly pass through the identification channel without actively swiping the card or actively staying. During the planned movement of workers, the personnel monitoring subsystem will automatically authorize their passage. When workers are not authorized or do not carry labor protection supplies with RFID tags, the channel will sound audible and visual alarms, effectively preventing illegal and illegal personnel from entering, and also preventing personnel from leaving without registration. In this way, long queues and other situations can be avoided, and safe and efficient circulation of personnel can be achieved.

Through the comprehensive application of RFID technology, weighing shelves and video surveillance, all materials can be unattended. Among them, all large materials can be tracked in real time through RFID tags, and small materials such as bolts and sealing rings can be monitored in real time through weighing shelves. Purchasing personnel only need to identify the RFID tags when entering the warehouse or enter the quality of small materials, and then the corresponding materials can be put into the warehouse without manual inventory. Workers can use their personal ID (identification number) cards for authorization before picking up supplies, and they can pick up the supplies they need at will. At this time, the weighing shelf or electronic tag reader will automatically identify the type and quantity of the supplies taken, eliminating the need for Eliminates manual management. If unauthorized personnel take materials without authorization, the weighing shelves or electronic tag readers will immediately sound and light alarms and video recordings, making the material warehouse truly unattended.

Different types of electronic tags should be used for different components, generally using the 840. 0 ~ 845. 0 MHz or 920. 5 ~ 924. 5 MHz frequency band, and through a fixed ultra-high frequency RFID reader. Performance test results of different types of electronic tags: Two types of anti-metal electronic tags fixed on a 20mm thick steel plate have different recognition distances in the same frequency band. The maximum recognition distances of A1 and A2 type electronic tags are approximately 5. 5 m and 8.0 m, respectively. 5 m.

Based on the electronic tag performance test and physical test results, different types of electronic tags are selected from factors such as packaging form, identification distance, installation method and installation location.

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