Thermal strain along optical fiber in lightweight composite FOG : Brillouin-based distributed measurement and finite element analysis

2014 ◽  
Author(s):  
Shu Minakuchi ◽  
Teruhisa Sanada ◽  
Nobuo Takeda ◽  
Shinji Mitani ◽  
Tadahito Mizutani ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Optical Fiber ◽  
Thermal Strain ◽  
Element Analysis ◽  
Distributed Measurement

scholarly journals Durability Optimization of Fiber Grating Hydrogen Sensor Based on Residual Stress

Sensors ◽  
2021 ◽  
Vol 21 (22) ◽  
pp. 7657
Author(s):  
Wenbo Ma ◽  
Yuyang Li ◽  
Ning Yang ◽  
Li Fan ◽  
Yanli Chen ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Optical Fiber ◽  
Film Thickness ◽  
Equivalent Stress ◽  
Hydrogen Sensor ◽  
Fiber Grating ◽  
Durability Test ◽  
Element Analysis ◽  
The Times

In this paper, in order to improve the durability of optical fiber grating hydrogen sensors, an optical fiber grating hydrogen sensor with high precision, stability, and durability is prepared. Based on the simplified two-dimensional model and finite element analysis, the effects of film thickness, coating speed, and coating times on the residual Mises equivalent stress between the sensor film and substrate were studied, and the optimum coating parameters were determined. The finite element analysis results show that the residual equivalent stress between the film and the substrate increases with the increase in the film thickness between 50 and 150 nm. The range of 200–250 nm is relatively stable, and the value is small. The coating speed has almost no effect on the residual equivalent stress. When the thickness of the film is 200 nm, the residual equivalent stress decreases with the increase in coating times, and the equivalent force is the lowest when the film is coated three times. The best coating parameters are the thickness of 200 nm, the speed of 62.5 μm/s, and the times of coating three times. The results of finite element analysis are verified by the hydrogen sensitivity test and durability test.

Finite element analysis of embedded optical fiber sensors

1994 ◽  
Author(s):  
Nicholas C. Eaton ◽  
R. C. Drew ◽  
Harald Geiger ◽  
P. J. Chivers ◽  
John P. Dakin
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Optical Fiber ◽  
Optical Fiber Sensors ◽  
Element Analysis ◽  
Fiber Sensors

Finite Element Analysis of the Piston Thermal Load in a Diesel Engine

2013 ◽  
Vol 459 ◽  
pp. 304-309
Author(s):  
Qing Ping Zheng ◽  
Chun Yan Ma ◽  
Jie Zhong Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Diesel Engine ◽  
Thermal Load ◽  
Thermal Strain ◽  
Three Dimensional ◽  
Maximum Temperature ◽  
Ring Groove ◽  
Element Analysis ◽  
Three Dimensional Modeling

Three-dimensional modeling and finite element analysis on the diesel engine piston is carried out in the paper. The distribution of temperature, stress and strain within piston at the rated conditions of the engine are obtained from the simulation. The calculated temperature is consistent with the results of the piston surface temperature which is obtained by hardness plug method, thus confirming the model's validity. The calculated maximum temperature is 374 °C and the minimum temperature is 144 °C. The maximum stress is 118MPa located between the piston skirt above the pin hole and the third ring groove. The maximum thermal strain appears at the piston top with the value of 6.29×10-3. Finally, the temperature simulation of the piston adopted oil-splashing cooling is implemented. It is proved that thermal load can be further reduced through cooling measure.

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