scholarly journals Design of self-heating test platform for sulfide corrosion and oxidation based on Fuzzy PID temperature control system

2021 ◽  
pp. 002029402110203
Author(s):  
Cheng-Wei Chu ◽  
Zhi-Chao Zhu ◽  
Hai-Tao Bian ◽  
Jun-Cheng Jiang
Keyword(s):  
Control System ◽  
Optical Fiber ◽  
Temperature Control ◽  
Optical Fiber Sensor ◽  
Oxidation Temperature ◽  
Fiber Sensor ◽  
Fuzzy Pid ◽  
Test Platform ◽  
Sulfide Corrosion ◽  
Corrosion And Oxidation

In this paper, the changes of oxidation temperature of sulfide corrosion and the deficiency of distributed optical fiber application were analyzed. The test platform of oxidation temperature of sulfide corrosion was established, and the performance test of optical fiber and the simulation of oxidation temperature of sulfide corrosion were realized. The hardware part of the control system used STM32 as the controller, the software part was based on the process characteristics of the controlled object, using MATLAB to carry out the simulation of PID, fuzzy, fuzzy PD plus I, fuzzy PID algorithms, and their performance are evaluated using both single indexes and comprehensive indexes. The experimental results also showed that the proposed fuzzy PID can achieve better control performance with less overshoot and shorter setting time. Therefore, the fuzzy PID was chosen as the temperature control algorithm to build the optical fiber sensor test platform, and an alarm method for testing the oxidation temperature of large area sulfide corrosion based on the optical fiber performance was obtained. Then, considering the influence of spatial resolution on optical fiber sensor, this paper used piecewise PID to simulate the temperature rise process of three stages of sulfurization corrosion and oxidation. The results showed that the alarm method of oxidation temperature of sulfurization corrosion has limitations for small-scale oxidation of sulfurization corrosion, and it needed to be combined with machine learning to identify temperature anomaly.

Active Compensation Control of Wind Force and Wire Roughness for Current Collector Using Optical Fiber Sensor

1999 ◽  
Author(s):  
Kazuo Yoshida ◽  
Masaaki Ukita ◽  
Toshiaki Makino
Keyword(s):  
Control System ◽  
Optical Fiber ◽  
Active Control ◽  
Contact Force ◽  
Optical Fiber Sensor ◽  
Current Collector ◽  
Low Noise ◽  
Fiber Sensor ◽  
Noise Current ◽  
And Control

Abstract For railways speed up such as 350km/h, it is particularly important to reduce noise caused by current collector for environmental problem. For a solution, a diamond shaped low-noise current collector has been developed. However, it becomes difficult for the current collector to maintain the predetermined contact force between the contact strip and the trolley-wire. Therefore, it is necessary to apply the active control to keep the contact force uniform. However, there is a serious problem for the active control that it is difficult to put sensors in high voltage region. In this paper, an application of plastic optical fiber sensor is devised and it is applied to the control system. In the experiment, the usefulness of the proposed sensor and control system is demonstrated.

Active Control for Vibration Suppression in a Flexible Beam Using a Modal Domain Optical Fiber Sensor

1991 ◽  
Vol 113 (3) ◽  
pp. 369-382 ◽  
Author(s):  
D. E. Cox ◽  
D. K. Lindner
Keyword(s):  
Control System ◽  
Optical Fiber ◽  
Active Control ◽  
Vibration Suppression ◽  
Axial Strain ◽  
Optical Fiber Sensor ◽  
Fiber Sensor ◽  
Laser Source ◽  
Flexible Structure ◽  
Flexible Beam

In this paper we discuss the use of a modal domain optical fiber sensor (MD sensor) as a component in an active control system to suppress vibrations in a flexible beam. An MD sensor consists, roughly, of a laser source, an optical fiber, and detection electronics. The basic operating principles of this sensor are reviewed and a model of this sensor is derived. It is shown that the output of an MD sensor is proportional to the integral of the axial strain along the optical fiber. Since we use a significant length of fiber for sensing, this sensor is called a distributed-effect sensor. When an MD sensor is attached to, or embedded in, a flexible structure, it will sense the strain in the structure along its gage length. Here we integrate the sensor model into the model for a flexible structure. Based on this system model, a control system with a dynamic compensator is designed to add damping to the low order modes of the flexible structure. To verify the modeling procedure an experiment was conducted. The experimental setup consisted of a cantilevered beam with a piezoelectric actuator and an MD sensor. A simulation of the experiment was developed based on the component models. It is shown that experimental responses closely match simulated responses for both open loop and closed loop tests. The experiment also incorporated several recent advances for practical MD sensor implementation including lead-in/lead-out insensitive fibers and elliptical core sensing fiber.

Nonlinear Effects of a Modal Domain Optical Fiber Sensor in a Vibration Suppression Control Loop for a Flexible Structure

1993 ◽  
Vol 115 (1) ◽  
pp. 120-128 ◽  
Author(s):  
D. K. Lindner ◽  
G. A. Zvonar ◽  
W. T. Baumann ◽  
P. L. Delos
Keyword(s):  
Control System ◽  
Optical Fiber ◽  
Vibration Suppression ◽  
Optical Fiber Sensor ◽  
Nonlinear Effects ◽  
Fiber Sensor ◽  
Control Loop ◽  
Linear Region ◽  
Cantilevered Beam ◽  
Mechanical Attachment

Recently, a modal domain optical fiber sensor has been demonstrated as a sensor in a control system for vibration suppression of a flexible cantilevered beam. This sensor responds to strain through a mechanical attachment to the structure. Because this sensor is of the interferometric type, the output of the sensor has a sinusoidal nonlinearity. For small levels of strain, the sensor can be operated in its linear region. For large levels of strain, the detection electronics can be configured to count fringes. In both of these configurations, the sensor nonlinearity imposes some restrictions on the performance of the control system. In this paper we investigate the effects of these sensor nonlinearities on the control system, and identify the region of linear operation in terms of the optical fiber sensor parameters.

Method of Measuring Tendon Force using Optical Fiber Sensor

2018 ◽  
Vol 56 (1) ◽  
pp. 94-99
Author(s):  
N. Sogabe ◽  
S. Nakaue ◽  
K. Chikiri ◽  
M. Hayakawa
Keyword(s):  
Optical Fiber ◽  
Optical Fiber Sensor ◽  
Fiber Sensor ◽  
Tendon Force

scholarly journals Oxygen concentration measurement in the porous cathode of a lithium-air battery using a fine optical fiber sensor

2019 ◽  
Vol 5 (0) ◽  
pp. 19-00095-19-00095
Author(s):  
Shogo FUJIMOTO ◽  
Suguru UEMURA ◽  
Nobuyuki IMANISHI ◽  
Shuichiro HIRAI
Keyword(s):  
Optical Fiber ◽  
Oxygen Concentration ◽  
Optical Fiber Sensor ◽  
Concentration Measurement ◽  
Fiber Sensor ◽  
Porous Cathode ◽  
Air Battery

scholarly journals Measurement Improvement of Distributed Optical Fiber Sensor via Lorenz Local Single Peak Fitting Algorithm

Symmetry ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1166
Author(s):  
Bin Liu ◽  
Jianping He ◽  
Shihai Zhang ◽  
Yinping Zhang ◽  
Jianan Yu ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Frequency Shift ◽  
Optical Fiber Sensor ◽  
Gain Spectrum ◽  
Fiber Sensor ◽  
Peak Fitting ◽  
Fitting Algorithm ◽  
Distributed Optical Fiber Sensor ◽  
Brillouin Gain ◽  
Distributed Optical Fiber

Brillouin frequency shift (BFS) of distributed optical fiber sensor is extracted from the Brillouin gain spectrum (BGS), which is often characterized by Lorenz type. However, in the case of complex stress and optical fiber self damage, the BGS will deviate from Lorenz type and be asymmetric, which leads to the extraction error of BFS. In order to enhance the extraction accuracy of BFS, the Lorenz local single peak fitting algorithm was developed to fit the Brillouin gain spectrum curve, which can make the BSG symmetrical with respect to the Brillouin center frequency shift. One temperature test of a fiber-reinforced polymer (FRP) packaged sensor whose BSG curve is asymmetric was conducted to verify the idea. The results show that the local region curve of BSG processed by the developed algorithm has good symmetry, and the temperature measurement accuracy obtained by the developed algorithm is higher than that directly measured by demodulation equipment. Comparison with the reference temperature, the relative measurement error measured by the developed algorithm and BOTDA are within 4% and 8%, respectively.

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