scholarly journals Vibration Error Characteristic Analysis and Optimization Method Research on Fiber Optical Current Transformers

2018 ◽  
Author(s):  
XIN-YING LIU ◽  
YAN-SONG LI ◽  
WEI-WEI ZHANG ◽  
JUN LIU
Keyword(s):  
Optimization Method ◽  
Error Characteristic ◽  
Characteristic Analysis ◽  
Current Transformers ◽  
Fiber Optical ◽  
Vibration Error

scholarly journals Error Characteristic Analysis of Fluid Momentum Law Test Apparatus

2020 ◽  
Vol 11 (1) ◽  
pp. 90
Author(s):  
Song Yang ◽  
Xianyong Zhu ◽  
Hui Wang
Keyword(s):  
Measurement Error ◽  
Control Method ◽  
Theoretical Research ◽  
Structural Deformation ◽  
Error Characteristic ◽  
Characteristic Analysis ◽  
Jet Impact ◽  
Effect Theory ◽  
Characteristic Points ◽  
Periodic Error

The flat-plate momentum test bench is a widely used experimental device in the verification of the momentum law of fluid mechanics, and its error characteristics are of positive significance for theoretical research and engineering innovation and expansion. The SPH-FEM coupling algorithm and spectrum analysis method are used to calculate and analyze the displacement response and spectrum characteristics of the characteristic points of the sensor under different jet loads. Based on them, the cause, classification, law, scope, influence and control method of the measurement error of the system are discussed and analyzed with the application of the error theory and the lateral effect theory of strain gauges; combined with physical experiments, the relevant analysis methods and conclusions are verified. The results show that the measurement error of the system includes linear error and periodic error. Structural deformation in the direction of jet impact is the main source of linear error; linear error increases with the increase of jet loads. Meanwhile, periodic vibration in non-jet direction is the main cause of periodic error, and the periodic error decreases with the increase of jet loads.

scholarly journals Design and validation of broadband calibration system for fiber-optical current transformers

2019 ◽  
Vol 1311 ◽  
pp. 012026
Author(s):  
YU Jicheng ◽  
LI Dengyun ◽  
LI Jun ◽  
LI He ◽  
LI Zhicheng
Keyword(s):  
Calibration System ◽  
Current Transformers ◽  
Fiber Optical

Improving Image Contrast of Fiber Point Diffraction Interferometer

2011 ◽  
Vol 187 ◽  
pp. 693-698
Author(s):  
Liang Nie ◽  
Jun Han ◽  
Xu Jiang
Keyword(s):  
Spherical Surface ◽  
Single Mode ◽  
Optimization Method ◽  
Single Mode Fiber ◽  
Image Contrast ◽  
Coating Film ◽  
Core Diameter ◽  
Fiber Optical ◽  
Set Up ◽  
Interference Image

To measure spherical surface with high precision, an advanced fiber point diffraction interferometer (FPDI) is introduced in this paper. Based on the system principle, the factors that affect the interference image contrast are put forward and analyzed, such as fiber optical properties, interferogram background and intensity match of two beams. Then the optimization method is proposed. The single-mode fiber with core diameter 3λ is selected and the dispersion between modes is removed. The short coherence length laser is designed with a semiconductor solid-state laser and meets the need of FPDI. By coating film on the fiber end face, the light use ratio is improved significantly. Finally, the fiber point diffraction interferometer system is set up in experiment and the interference fringes are obtained. The result shows that the FPDI can achieve interference patterns with high contrast after optimization and the system has reached a relatively high accuracy.

scholarly journals Optimal Cruise Characteristic Analysis and Parameter Optimization Method for Air-Breathing Hypersonic Vehicle

2021 ◽  
Vol 11 (20) ◽  
pp. 9565
Author(s):  
Hesong Li ◽  
Yunfan Zhou ◽  
Yi Wang ◽  
Sha Du ◽  
Shangcheng Xu
Keyword(s):  
Fuel Consumption ◽  
Parameter Optimization ◽  
Target Position ◽  
Optimization Method ◽  
Hypersonic Vehicle ◽  
Parameters Optimization ◽  
Characteristic Analysis ◽  
Optimal Point ◽  
Parameterized Model ◽  
The Relationship

There is an optimal cruise point with the lowest fuel consumption when a hypersonic vehicle performs steady-state cruise. The optimal cruise point is composed of the optimal cruise altitude and the optimal cruise Mach number, and its position is closely related to the aircraft parameters. This article aims to explore the relationship between the optimal cruise point and relevant aircraft parameters and establish a model to describe it, then an aircraft parameter optimization method of adjusting the optimal cruise point to the target position is explored with validation by numerical simulation. Firstly, a parameterized model of a hypersonic vehicle is obtained as a basis, then the optimal cruise point is obtained by the optimization method, and the influence of a single aircraft parameter on the optimal point is investigated. In order to model the relationship between the aircraft parameters and the optimal cruise point, a neural network is employed. Finally, the model is used to optimize the aircraft parameters under multiple constraints. The results show that, after aircraft parameters optimization, the optimal cruise point is located at the predetermined position and the fuel consumption is lower, which provides a new perspective for the design of aircraft.

Measurement of Verdet Constant in Fiber Optical Current Transducer Using an Optimization Method

2012 ◽  
Vol 32 (11) ◽  
pp. 1128003
Author(s):  
庄静 Zhuang Jing ◽  
肖悦娱 Xiao Yueyu ◽  
彭蕾 Peng Lei ◽  
颜锦奎 Yan Jinkui
Keyword(s):  
Optimization Method ◽  
Verdet Constant ◽  
Fiber Optical ◽  
Current Transducer

Accuracy Analysis of Highly Kinematical Positioning of GPS

2014 ◽  
Vol 602-605 ◽  
pp. 1847-1850
Author(s):  
Jie Zhan ◽  
Lin Yuan ◽  
Yin Lin Wu
Keyword(s):  
Random Error ◽  
Carrier Phase ◽  
Processing Method ◽  
Error Characteristic ◽  
Accuracy Analysis ◽  
Positioning Error ◽  
Test Results ◽  
Characteristic Analysis ◽  
Positioning Accuracy ◽  
Data Processing Method

For the accuracy of highly kinematical positioning of GPS carrier phase is not easy to be obtained directly, a data processing method is presented based on the analysis of several common kinematical positioning accuracy analytical methods. The method firstly analyzes and models the state of motion carrier, and then conducts a statistics variable composed by multiple positioning data , Finally uses a determined relation between the variance of the statistics variable and the variance of the positioning error to gain the variance of positioning error by calculating the variance of the statistics variable. The test results show that the method is effective for random error characteristic analysis.

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