A Novel RFID-Based Sensing Method for Low-Cost Bolt Loosening Monitoring
Abstract
:1. Introduction
2. Bolt Monitoring System Hardware Design
2.1. UHF Passive RFID Technology
2.2. UHF Passive RFID Tag Design
2.3. Ultra High Frequency Passive RFID Reader Design
2.4. Bolt Loosening Monitoring System Based on RFID
3. RFID Reading and Writing Distance Test
3.1. Determinant Factors of RFID Reading and Writing Distance
3.2. RF Signal Strength Test
4. System Software Design
5. Confirmatory Experiments and Comparative Study
5.1. Confirmatory Experiment
5.2. Comparative Experiment
5.3. Comparative Reaserch Conclusions
System | Single Cost/RMB | Cost of 100 Nodes/RMB | P/mW | S/cm2 | Success Rate | Monitoring Angle |
---|---|---|---|---|---|---|
A | 0.3 | 830 | 0 | 1 | 99% | Approx. 20° |
B | 10 | 1020 | 300 | 16 | 95% | 10°–12° |
6. Conclusions
- (1)
- An innovative approach to the loose bolt problem in coal mine cage guide structure, which is caused by harsh environment and many other factors, was developed in this study. The proposed monitoring system consists of a bolt gearing system, passive UHF RFID tags, metal film, reader, and monitoring software, the system utilizes passive RFID technology, as discussed at length above. Within sufficient range of communication, the reader sends radio-frequency signals to the RFID tag, which is powered by the electromagnetic wave due to coil coupling principle before sending information back to the monitor.
- (2)
- To construct the system, an RFID tag was fixed on a large gear and a tinfoil metal film was fixed on the retaining plate. When the RFID tag is covered by the tinfoil, it is unable to communicate with the reader, the nut to be detected is fixed in the small gear’s center, so once the nut loosens, the rotation of the small gear rotates the large gear, exposing the tag antenna which then sends a radio-frequency signal from the corresponding bolt to the RFID reader and displayed on the monitoring software interface.
- (3)
- We examined the reading distance between the reader and tag and effective distance between the tag and metal film, as well as the relationship of reading rate and reader and metal film distance all in terms of the proposed system’s feasibility and potential to be optimized successfully. A similar, proven-effective multipoint bolt loosening monitoring system based on reed switch was also tested for the sake of comparison to evaluate strengths and weaknesses of the proposed system.
- (4)
- Constrained by installation form of coal mine guide structure, the proposed system can only detect bolt loosening when nut rotational angle exceeds 20° though, the system can theoretically be further optimized by changing the radius ratio of the two gears. To this effect, the proposed method represents a good reference for use in other applications that employ bolt-nut systems.
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Wu, J.; Cui, X.; Xu, Y. A Novel RFID-Based Sensing Method for Low-Cost Bolt Loosening Monitoring. Sensors 2016, 16, 168. https://doi.org/10.3390/s16020168
Wu J, Cui X, Xu Y. A Novel RFID-Based Sensing Method for Low-Cost Bolt Loosening Monitoring. Sensors. 2016; 16(2):168. https://doi.org/10.3390/s16020168
Chicago/Turabian StyleWu, Jian, Xingmei Cui, and Yunpeng Xu. 2016. "A Novel RFID-Based Sensing Method for Low-Cost Bolt Loosening Monitoring" Sensors 16, no. 2: 168. https://doi.org/10.3390/s16020168
APA StyleWu, J., Cui, X., & Xu, Y. (2016). A Novel RFID-Based Sensing Method for Low-Cost Bolt Loosening Monitoring. Sensors, 16(2), 168. https://doi.org/10.3390/s16020168