Development and commissioning of FBG sensors for impact test of rock fall protective barrier

Abstract

Purpose – This paper aims to present an effective sensing detection system based on fiber Bragg grating (FBG) sensing technology for protective barriers that have been effectively applied to intercept and stop rocks from falling onto railway tracks. . Determination of exact stress and deformation values during impact tests for key components of the protective barrier forms important criteria for quality control of these barriers. Monitoring changes in force along the protective barrier when deployed in field application allows for real-time disaster warning for collapse and falling rocks. Design/methodology/approach – In this paper, we propose a monitoring strategy for key components of a protective barrier. During performance tests, dynamic force and strain were measured for the steel strands and supporting I-beam, respectively. Design of a special elastic structure for the force transducer based on finite element analysis and tensile tests has been discussed here. Two types of FBG force transducers were manufactured based on the elastic structure. Four FBG force transducers and four FBG strain sensors were used for impact verification testing of a new rigid protective barrier with a design protection level of 25 KJ. Findings – Dynamic force and strain responses were obtained during an impact of free-falling block with a kinetic energy of 25 KJ. Originality/value – The FBG monitoring scheme can be extremely valuable for optimized design of the barrier and can provide real-time disaster warning in regions of collapse and falling rocks.

Condition Monitoring of Rail Transport Systems: A Bibliometric Performance Analysis and Systematic Literature Review

“…Such a fence ensures safety against eroding rocks and other material falling from hillsides next to railway tracks. These monitoring systems consisted of fiber optics, as described in Guo et al [ 285 ], and the system was equipped with accelerometers ( MEMS sensors ), whereas the energy for the system came from solar panels, as such a system can be installed more easily in hard-to-reach terrain.…”

Development and Commissioning of High Temperature FBG Solid Pressure Sensors

“…Thus, it is unsuitable for conventional measurement. We must encapsulate it so as to reach the purpose of pressure sensitivity and compression resistance [23][24][25]. According to solid mechanics and current research result of matching error of solid sensor [14], if the sensor is designed into cake shape, it can obtain ideal test value.…”

Diaphragm Based Fiber Bragg Grating Acceleration Sensor with Temperature Compensation

“…They have offered the advantages of miniature size and light weight, are resistant to electromagnetic interference and corrosion, and easy to perform distributed dynamic measurements [ 1 , 2 , 3 , 4 , 5 ]. In recent years, FBG-derived sensors have aroused increased interest for structural health monitoring in many industrial sectors due to their remarkable attributes [ 6 , 7 ]. FBGs have been increasingly extended to measure seismic and mechanical vibration through designing mechanical structures to convert vibration into strain signals [ 8 ].…”