Research On Fiber Optic Sensor For Vibration Of Oil Equipment For Mining

With the significant increase in social development demand for mineral resources,it is very important to monitor the operating status of mining equipment,find fault information in a timely manner,and take effective handling measures to ensure the safe operation of mining equipment.Among the vibration monitoring of mining equipment is one of the most common methods to monitor the operating status of equipment,but the traditional electronic sensors used to measure the vibration of equipment by the harsh environment of the mine has problems such as accuracy and limited transmission distance,resulting in the application of safety monitoring of mining equipment in the actual site of the project received great restrictions.Fiber grating has the advantages of small size,anti-electromagnetic interference,long-distance transmission,etc.In recent years,vibration measurement has been widely concerned and studied,especially in the field of mining equipment safety monitoring has a high application value.Therefore,this paper takes the fiber grating vibration measurement of oil for mining equipment as the starting point,designs a fiber grating vibration sensor based on piston-spring as the force conversion device structure,explains the working principle of the sensor and constructs the dynamics model of the sensor,and through the simulation calculation of the mathematical model of the sensor,obtains the motion characteristics of the sensor,analyzes the sensor structure parameters and environmental variables on the The influence of the sensor structure parameters and environmental variables on the sensor performance is analyzed,and the structural parameters of the sensor are optimized.Finally,the experimental platform of sensor performance is built,and the performance of linearity,hysteresis,repeatability,static error and sensitivity of the sensor is obtained according to the relationship between the oil pressure and the change of wavelength at the center of fiber grating,which can meet the safety monitoring requirements of oil vibration for mining equipment,and has certain theoretical guidance and reference significance for realizing the safe operation of mining equipment.The main work of the paper is as follows.(1)The necessity of safety monitoring of mining equipment and commonly used vibration detection methods are reviewed,the significance of the existence of oil in mining equipment is briefly explained,the method of reacting to the vibration safety status of equipment by measuring the change of oil pressure in the equipment is proposed,and the research status of fiber grating sensor is summarized,including the research of the performance sensitization method of fiber grating sensor,the design of sensor structure and the way of pasting fiber grating,the solution of cross-sensitivity problem,and the comparative analysis of the performance test methods and results of the same sensor.(2)According to the working principle of fiber optic grating and sensor,a fiber optic grating vibration sensor based on piston-spring as a force conversion device structure is designed,and the relationship between the oil pressure and the wavelength variation of the center of the fiber optic grating is deduced.The mathematical model of the sensor is constructed,and Simulink software is used as a platform to simulate the motion displacement of the piston in the sensor,and the displacement curve is generated by inputting relevant parameters such as spring stiffness and structure size to analyze the influence of important parameters on the sensor performance.(3)A three-dimensional model of the sensor geometry structure was established according to the optimized parameters of the sensor structure,and a static analysis of the sensor was carried out by ANSYS Workbench software to obtain the larger stress value of the sensor and the site of the maximum deformation and correct the structural parameters;and a modal analysis of the sensor was carried out to calculate the inherent frequency of the sensor at 1887.6Hz,which ensures the reliability of the sensor structure.(4)The kinetic simulation of the sensor was carried out by Adams software,and the results showed that the working displacement of the piston of the sensor within one cycle after the force met the design requirements,and the more accurate kinematic curve of the piston was obtained.The optimized parameters of the sensor structure were obtained.(5)The sensor pressure calibration experiment system platform was built,and the optical fiber sensor was manufactured according to the working principle.Through different system pressure tests,the results show that the performance of the sensor can meet the monitoring of oil vibration of mine equipment,and the sensor performance is93.84% linearity,2.17% repeatability and 0.69 m W/MPa sensitivity.The paper has 56 figures,16 tables,and 91 references.