Research On Monitoring Technology Of Metal Wear Particle In Oil Fluid

Wearing always occurs in the running process of mechanical equipment so that metal debris will be produced. The large metal particles in lubricating oil will make safety problems in the mechanical equipment. So, monitoring the size and quantity of metal wear particles in lubricating oil plays an important role in improving the safety of mechanical equipment. There have been many studies of the monitoring technology of metal wear particles at home and abroad.The research and manufacture of the sensor is a very important part in study of the monitoring technology of metal wear particles in oil. However, there have been more theoretical research but less empirical research in China. Furthermore, there has been no relatively perfect sensor to detect metal wear particles in the oil in our country, while many mature sensors, such as Mates SCAN, have been widely used abroad.At first, this paper analyzed the current research status and development trend of metal wear particles monitoring technology at home and abroad. Then, the metal wear particle detection sensor was studied and designed. The reverse-double-excitation solenoid monitoring sensor was used in this study and the structure of this sensor has been theoretically analyzed. The finite element model was established by using COMSOL Multiphysics software to simulate the magnetic field changes of the sensor coil when the metal wear particles flowed through. Comparative analysis of the parameters which could affect the performance of the sensor has also been done. Consider the effects of the coil turns, the fill factor, the input voltage and some other factors, the two-dimensional axisymmetric finite element model was established using COMSOL Multiphysics software. The model building, material selection, selection of physical field, grid partitioning, and post-treatment of the results are described in detail. The magnetic field of the coils, the the magnetic field changes and the performance of the sensor are simulated and studied with different model parameters. In the process of simulation, considering the effects of particles' radial position, the paper also established a three-dimensional model to obtain the error. Finally, the appropriate model of the sensor is obtained by simulation, and the number of turns of the coil, turn number ratio, window structure and some other important parameters have been determined. The feasibility of the on-ling sensor metal debris monitoring system is analyzed.This study can also provide a theoretical basis for the production of the sensor. Ultimately,, the structure of the sensor and the preamplifier circuit have been designed based on theoretical research and simulation studies.As the final selection of the excitation power supply is 2500 Hz, 220 V AC power, and that the laboratory has not finishd the production of the power supply. The metal particle sensor study is stlil in the design phase so that practicality experiment will be urgently needed.