Research on Real-time Monitoring of Launch Vehicle Deformation Using Fiber Bragg Grating Sensor

Abstract To solve the problem that the curvature information of the large flexible rocket body affects the attitude control of the rocket body, a shape reconstruction method based on optical fiber strain sensing is proposed in this paper, which can measure the bow deformation and vibration state of the rocket in real time as the input data for adjusting the attitude control of the rocket. In this scheme, the dynamics of flexible rocket can be solved stably and quickly. In order to verify the reconstruction method, the beam model was used as the experimental analysis object, and the vibration information such as deformation of the beam model was identified through the strain value measured by fiber Bragg grating (FBG) sensors. The results show that the deformation reconstruction method can well restore the deformation and rotation angle of the beam system and has good stability and real-time performance. This method can provide a theoretical basis for the real-time deformation calculation and high-precision attitude control of future flexible launch vehicle.

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Measurement of the Thermal Expansion for Space Structures Using Fiber Bragg Grating Sensors and Displacement Measuring Interferometers

Smart Materials, Adaptive Structures and Intelligent Systems, Volume 1 ◽

10.1115/smasis2008-479 ◽

2008 ◽

Author(s):

Hong-Il Kim ◽

Lae-Hyong Kang ◽

Jae-Hung Han

Keyword(s):

Fiber Bragg Grating ◽

Real Time ◽

Deformation Monitoring ◽

Space Environment ◽

Space Structures ◽

Bragg Grating ◽

Environment Change ◽

Time Deformation ◽

Fiber Bragg Grating Sensors ◽

Fbg Sensors

Dimensional stability of the space structures, such as large telescope mirrors or metering substructures, is very important because even extremely small deformations of these structures might degrade the optical performances. Therefore, precise deformation data of the space structures according to environment change are required to design these structures correctly. Also, real-time deformation monitoring of these structures in space environment is demanded to verify whether these structures are properly designed or manufactured. FBG (fiber Bragg grating) sensors are applicable to real time monitoring of the space structure because they can be embedded onto the structures with minimal weight penalty. In this research, therefore, thermal deformation measurement system for the space structures, composed of FBG sensors for real time strain measurement and DMI (displacement measuring interferometers) for accurate specimen expansion data acquisition, is developed. Thermal strains measured by distributed FBG sensors are evaluated by the comparison with the strains obtained by highly accurate DMI.

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Fiber Bragg grating sensor-based monitoring strategy for slope deformation in centrifugal model test

Sensor Review ◽

10.1108/sr-10-2017-0218 ◽

2019 ◽

Vol 39 (1) ◽

pp. 71-77 ◽

Cited By ~ 3

Author(s):

Yongxing Guo ◽

Jianjun Fu ◽

Longqi Li ◽

Li Xiong

Keyword(s):

Fiber Bragg Grating ◽

Real Time ◽

Model Test ◽

Bragg Grating ◽

Monitoring Strategy ◽

Content Type ◽

Centrifugal Model Test ◽

Time Deformation ◽

Fbg Sensors ◽

Centrifugal Model

Purpose Centrifugal model tests can accelerate the characterization of landslides and demonstrate the form of slope failure, which is an important measure to research its instability mechanisms. Simply observing the slope landslide before and after a centrifugal model test cannot reveal the processes involved in real-time deformation. Electromagnetic sensors have severed as an existing method for real-time measurement, however, this approach has significant challenges, including poor signal quality, interference, and complex implementation and wiring schemes. This paper aims to overcome the shortcomings of the existing measurement methods. Design/methodology/approach This work uses the advantages of fiber Bragg grating (FBG) sensors with their small form-factor and potential for series multiplexing in a single fiber to demonstrate a monitoring strategy for model centrifugal tests. A slope surface deformation displacement sensor, FBG anchor sensor and FBG anti-slide piling sensor have been designed. These sensors are installed in the slope models, while centrifugal acceleration tests under 100 g are carried out. Findings FBG sensors obtain three types of deformation information, demonstrating the feasibility and validity of this measurement strategy. Originality/value The experimental results provide important details about instability mechanisms of a slope, which has great significance in research on slope model monitoring techniques and slope stability.

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Research on a strain-based shape reconstruction method using the Fiber Bragg Grating sensors

Structural Health Monitoring and Integrity Management ◽

10.1201/b18510-67 ◽

2015 ◽

pp. 209-209

Keyword(s):

Fiber Bragg Grating ◽

Shape Reconstruction ◽

Bragg Grating ◽

Reconstruction Method ◽

Fiber Bragg Grating Sensors

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An unsupervised clustering-based sectionalized displacement reconstruction method for smart geogrids integrated with fiber Bragg grating sensors

Construction and Building Materials ◽

10.1016/j.conbuildmat.2021.122924 ◽

2021 ◽

Vol 286 ◽

pp. 122924

Author(s):

Zheng-fang Wang ◽

Wen-qiang Kang ◽

Jing Wang ◽

Chang-bin Tian ◽

Qin-mei Sui ◽

...

Keyword(s):

Fiber Bragg Grating ◽

Unsupervised Clustering ◽

Bragg Grating ◽

Reconstruction Method ◽

Fiber Bragg Grating Sensors ◽

Displacement Reconstruction

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Real-time measurement of temperature field in heavy-duty machine tools using fiber Bragg grating sensors and analysis of thermal shift errors

Mechatronics ◽

10.1016/j.mechatronics.2015.04.004 ◽

2015 ◽

Vol 31 ◽

pp. 16-21 ◽

Cited By ~ 20

Author(s):

Jun Huang ◽

Zude Zhou ◽

Mingyao Liu ◽

Erlong Zhang ◽

Ming Chen ◽

...

Keyword(s):

Temperature Field ◽

Fiber Bragg Grating ◽

Real Time ◽

Machine Tools ◽

Time Measurement ◽

Bragg Grating ◽

Heavy Duty ◽

Fiber Bragg Grating Sensors ◽

Real Time Measurement ◽

Thermal Shift

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Real-Time Train Wheel Condition Monitoring by Fiber Bragg Grating Sensors

International Journal of Distributed Sensor Networks ◽

10.1155/2012/409048 ◽

2011 ◽

Vol 8 (1) ◽

pp. 409048 ◽

Cited By ~ 24

Author(s):

Chuliang Wei ◽

Qin Xin ◽

W. H. Chung ◽

Shun-yee Liu ◽

Hwa-yaw Tam ◽

...

Keyword(s):

Fiber Bragg Grating ◽

Real Time ◽

Visual Inspection ◽

Condition Index ◽

Bragg Grating ◽

Time System ◽

Real Time System ◽

Fiber Bragg Grating Sensors ◽

Extensive Field ◽

The Cost

Wheel defects on trains, such as flat wheels and out-of-roundness, inevitably jeopardize the safety of railway operations. Regular visual inspection and checking by experienced workers are the commonly adopted practice to identify wheel defects. However, the defects may not be spotted in time. Therefore, an automatic, remote-sensing, reliable, and accurate monitoring system for wheel condition is always desirable. The paper describes a real-time system to monitor wheel defects based on fiber Bragg grating sensors. Track strain response upon wheel-rail interaction is measured and processed to generate a condition index which directly reflects the wheel condition. This approach is verified by extensive field test, and the preliminary results show that this electromagnetic-immune system provides an effective alternative for wheel defects detection. The system significantly increases the efficiency of maintenance management and reduces the cost for defects detection, and more importantly, avoids derailment timely.

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