De Algorithm Optimization Design Research and Numerical Simulation of a New Optical Fiber F-P Sensing System

2013 ◽  
Vol 710 ◽  
pp. 484-487
Author(s):  
Ning Shan ◽  
Tuan Jie Liu
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Optical Fiber ◽  
Optimization Design ◽  
Design Research ◽  
Algorithm Optimization ◽  
Signal Attenuation ◽  
Practical Applications ◽  
Sensing System ◽  
De Algorithm

Optical fiber F-P sensor has several advantages, such as strong anti-interference ability, quick speed and high precision. It is widely applied in detecting fields. But optical fiber F-P sensor deviates from working point easily in practical applications, it leads to output signal attenuation and the decreasing of signal noise ratio. The double wavelength optical fiber F-P sensing system is designed to solve the problem. DE algorithm mathematical model of sensing system is established, meanwhile, a higher orthogonal precision sensing system is optimization designed. The orthogonal error of sensing system is studied. The results show that DE algorithm is correct and reliable. Its run time is shorter and the error is less than 10-3. The optimization objective decreases sharply. When the length of F-P cavity changes 0~2500nm, the orthogonal error of sensing system is less than 5%. It has higher stability and anti-interference ability. These results show that the DE algorithm can be used for the structural optimization design of optical fiber F-P sensor.

scholarly journals Influence of Initial Phase Modulation on the Sensitivity of the Optical Fiber Sagnac Acoustic Emission Sensor

2019 ◽  
Vol 9 (5) ◽  
pp. 1018
Author(s):  
Zhuming Cheng ◽  
Jie Zeng ◽  
Dakai Liang ◽  
Chen Chang ◽  
Bing Wang
Keyword(s):  
Acoustic Emission ◽  
Optical Fiber ◽  
Initial Phase ◽  
Experimental System ◽  
Phase Sensitivity ◽  
Acoustic Emission Sensor ◽  
Alloy Plate ◽  
Practical Applications ◽  
Sensing System ◽  
Good Agreement

Improving the phase sensitivity of the optical fiber Sagnac sensor is very important for accurately detecting weak signals of acoustic emission. Theoretical analysis shows that the initial phase of the sensor is π under ideal conditions, and the maximum phase sensitivity is obtained when the bias phase is π/2. In this work, an experimental system was built with an aluminum alloy plate as the experimental object. The initial phase of the sensor was modulated by a Y-branch waveguide, and the fitting curve of the experimental data was in good agreement with the curve of the numerical simulation. Moreover, our experiments show there was a single value for the bias phase of π/2, which significantly deviated from the theoretical value. The results show that the greatest phase sensitivity of the sensor not only could be increased by nearly nine times through modulating the initial phase, but also could suppress the harmonic interferences in the sensing system. This study can provide a useful reference for improving the phase sensitivity of the optical fiber Sagnac AE sensor in practical applications.

The Optimization Design Research on the Seismic Control of Large-Span Spatial Structure

2011 ◽  
Vol 233-235 ◽  
pp. 2773-2777
Author(s):  
Xiang Zhao ◽  
She Liang Wang ◽  
Jian Bo Dai ◽  
Xi Cheng Zhao ◽  
Xi Yu Zhu
Keyword(s):  
Numerical Simulation ◽  
Spatial Structure ◽  
Optimization Design ◽  
Design Research ◽  
Active Vibration Control ◽  
Large Span ◽  
Seismic Control ◽  
Giant Magnetostrictive Material ◽  
Active Vibration ◽  
Main Component

Focuses on the dynamical collapse of large-span spatial structure, this paper uses giant magnetostrictive material as the main component to design a kind of new GMM actuator, which could used in active vibration control of large-span spatial structure. The genetic algorithm has been used to optimize the position of actuators in large-span spatial structure, and the optimization of the results has been analyzed by numerical simulation. The research shows that the GMM actuator has fine actuator effectiv.

Numerical simulation of a neotype fluidic sensing system based on side-polished optical fiber

2020 ◽  
Vol 16 (4) ◽  
pp. 262-267
Author(s):  
Yu Liu ◽  
Bing-qing Xia ◽  
Hua-yong Tan ◽  
Yong-le Lu ◽  
Ke Di ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Optical Fiber ◽  
Sensing System

Design and Experiment Research of a Non-Contact Optical Fiber F-P Ultrasound Sensor for Detecting Surface Defects

2010 ◽  
Vol 34-35 ◽  
pp. 322-326
Author(s):  
Ning Shan
Keyword(s):  
Optical Fiber ◽  
Surface Defects ◽  
Signal To Noise Ratio ◽  
Low Cost ◽  
Differential Evolution Algorithm ◽  
Laser Ultrasound ◽  
Small Surface ◽  
Practical Applications ◽  
Sensing System ◽  
Noise Ratio

Laser ultrasound technology has many advantages such as being non-contact, nondestructive, fast, accurate and low cost. Therefore it is usually used as an effective way to detect and characterize small surface or subsurface breaking cracks. The optical fiber F-P sensor is adapted to laser ultrasound detection field because it can detect ultrasound signals non-contact. But the optical fiber F-P sensor deviates from working point easily because of machining error and external factors in practical applications. It leads to output signal attenuation and the decreasing of signal noise ratio. On this problem, an optical fiber F-P sensing system based on two wavelength quadrature-shifted demodulation technique is designed. The mathematical model of sensing system is established. Differential Evolution Algorithm is introduced to establish the optimal model of sensing system for the first time. The structure of sensing system is optimized designed. The non-contact laser ultrasound experimental devices based on optical fiber F-P senor are established for detecting surface defects. The experimental results show this sensor can detect surface defects effectively. It has higher sensitivity and larger signal-to-noise ratio.

Finite Element Analysis and Optimization Design on Single Screw Pump of Offshore Petroleum Well Cementing LADS Device

2014 ◽  
Vol 941-944 ◽  
pp. 2588-2595
Author(s):  
Zhan Xu Wang
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Optimization Design ◽  
Dynamics Analysis ◽  
Model Design ◽  
Element Analysis ◽  
Screw Pump ◽  
Simulation And Optimization ◽  
Single Screw ◽  
Assembly Simulation

The single screw mathematical model is established based on dynamics analysis, and the numerical simulation and optimization design is analyzed. Through the virtual assembly simulation and digital assembly experiments on the single screw, to obtain the compatibility of the improved single screw structure. Thereby, the matching and assembly interference of model design is tested, to optimize the improved single screw compatibility between the stator and rotor.

The Virtual Assembly Simulation and Optimization Design on Single Screw Pump of Offshore Petroleum Well Cementing LADS Device

2014 ◽  
Vol 945-949 ◽  
pp. 203-208
Author(s):  
Zhan Xu Wang
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Optimization Design ◽  
Virtual Assembly ◽  
Dynamics Analysis ◽  
Model Design ◽  
Screw Pump ◽  
Simulation And Optimization ◽  
Single Screw ◽  
Assembly Simulation

The single screw mathematical model is established based on dynamics analysis, and the numerical simulation and optimization design is analyzed. Through the virtual assembly simulation and digital assembly experiments on the single screw, to obtain the compatibility of the improved single screw structure. Thereby, the matching and assembly interference of model design is tested, to optimize the improved single screw compatibility between the stator and rotor, and the device is achieved a dynamic interactive digital assembly in virtual reality environments.

Numerical Simulation on Mold Electromagnetic Eccentric Stirring and Central Segregation of Round Bloom

2013 ◽  
Vol 652-654 ◽  
pp. 2450-2454
Author(s):  
Zhi Hong Zhang ◽  
Guo Guang Cheng
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Electromagnetic Stirring ◽  
Center Line ◽  
Central Segregation

The paper describes multi-section round bloom casting using external MEMS, equipped with max section D600mm and min D280mm mold, the center line of D280mm mold not coincident with the axis of stirrer coils. it is exist eccentric electromagnetic stirring of mold which section less than max D600mm, a mathematical model of MEMS has been established, the index of central segregation of D280mm macrostructure had decreased less than 1.12 by optimized parameters of electromagnetic stirring and SEN immerse depth, in the end, the quality of round bloom had improved.

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