Magnetization Model and Detection Mechanism of a Microparticle in a Harmonic Magnetic Field

Zhang, Xingming; Zeng, Lin; Zhang, Hongpeng; Huang, Shan

doi:10.1109/tmech.2019.2928704

Cited by 41 publications

(16 citation statements)

References 21 publications

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“…When the metal wear debris passes through the sensing unit, the coil impedance will change due to electromagnetic induction. Based on previous studies [ 29 ], the coil impedance Z can be calculated by

…”

Section: Detection Principlementioning

confidence: 99%

A Novel Impedance Micro-Sensor for Metal Debris Monitoring of Hydraulic Oil

Zhang

Shi

et al. 2021

Micromachines

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Hydraulic oil is the key medium for the normal operation of hydraulic machinery, which carries various wear debris. The information reflected by the wear debris can be used to predict the early failure of equipment and achieve predictive maintenance. In order to realize the real-time condition monitoring of hydraulic oil, an impedance debris sensor that can detect inductance and resistance parameters is designed and studied in this paper. The material and size of wear debris can be discriminated based on inductance-resistance detection method. Silicon steel strips and two rectangular channels are designed in the sensor. The silicon steel strips are used to enhance the magnetic field strength, and the double rectangular detection channels can make full use of the magnetic field distribution region, thereby improving the detection sensitivity and throughput of the sensor. The comparison experiment shows that the coils in series are more suitable for the monitoring of wear debris. By comparing and analyzing the direction and the presence or absence of the signal pulses, the debris sensor can detect and distinguish 46 µm iron particles and 110 µm copper particles. This impedance detection method provides a new technical support for the high-precision distinguishing measurement of metal debris. The sensor can not only be used for oil detection in the laboratory, but also can be made into portable oil detection device for machinery health monitoring.

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…”

Section: Detection Principlementioning

confidence: 99%

A Novel Impedance Micro-Sensor for Metal Debris Monitoring of Hydraulic Oil

Zhang

Shi

et al. 2021

Micromachines

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“…When the metal debris passes through the magnetic field distribution region, the eddy current effect and magnetization effect will be stimulated inside the metal debris, which will break the original balance of the magnetic field, skin effect and proximity effect, resulting in the impedance change of the coil. According to the previous theoretical analysis [22], the impedance change caused by a single spherical metal debris is:…”

Section: Inductance-resistance Sensing Principlementioning

confidence: 99%

An Impedance Sensor for Distinguishing Multi-Contaminants in Hydraulic Oil of Offshore Machinery

et al. 2021

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The cleanliness of hydraulic oil can reflect the service life of the oil and the wear state of hydraulic machinery. An impedance sensor is proposed to distinguish multi-contaminants in hydraulic oil. The impedance sensor has two detection modes: the inductance-resistance mode is used to detect metal debris, and the capacitance mode is used to distinguish water droplets and air bubbles. By adding a built-in silicon steel strip and an external silicon steel strip with high magnetic permeability, the distribution area, strength, and uniformity of the magnetic field are enhanced to improve the detection sensitivity under inductance and resistance parameters. In addition, the silicon steel strips are used as electrode plates to introduce capacitance parameter detection. The experimental results show that the resistance detection method based on coil successfully improves the detection ability for non-ferromagnetic metal debris. The impedance sensor for distinguishing multi-contaminants in hydraulic oil can provide technical support for fault diagnosis of offshore hydraulic machinery.

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“…Under normal operating conditions of the system, the size of solid particles is usually 10-20 µm. When the mechanical components are abnormally worn, the abrasive grain size can reach 50-100 µm [4][5][6][7][8] or more, which will affect the normal operation of the equipment.…”

Section: Introductionmentioning

confidence: 99%

Design and Research of Inductive Oil Pollutant Detection Sensor Based on High Gradient Magnetic Field Structure

Bai

Wang

et al. 2021

Micromachines

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An inductive oil pollutant detection sensor based on a high-gradient magnetic field structure is designed in this paper, which is mainly used for online detection and fault analysis of pollutants in hydraulic and lubricating oil systems. The innovation of the sensor is based on the inductance detection method. Permalloy is embedded in the sensing region of the sensor, so that the detection area generates a high gradient magnetic field to enhance the detection accuracy of the sensor. Compared with traditional inductive sensors, the sensor has a significant improvement in detection accuracy, and the addition of permalloy greatly improves the stability of the sensor’s detection unit structure. The article theoretically analyzes the working principle of the sensor, optimizes the design parameters and structure of the sensor through simulation, determines the best permalloy parameters, and establishes an experimental system for verification. Experimental results show that when a piece of permalloy is added to the sensing unit, the signal-to-noise ratio (SNR) of iron particles is increased by more than 20%, and the signal-to-noise ratio of copper particles is increased by more than 70%. When two pieces of permalloy are added, the signal-to-noise ratio for iron particles is increased by more than 70%, and the SNR for copper particles is increased several times. This method raises the lower limit of detection for ferromagnetic metal particles to 20 μm, and the lower limit for detection of non-ferromagnetic metal particles to 80 μm, which is the higher detection accuracy of the planar coil sensors. This paper provides a new and faster online method for pollutant detection in oil, which is of great significance for diagnosing and monitoring the health of oil in mechanical systems.

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Magnetization Model and Detection Mechanism of a Microparticle in a Harmonic Magnetic Field

Cited by 41 publications

References 21 publications

A Novel Impedance Micro-Sensor for Metal Debris Monitoring of Hydraulic Oil

A Novel Impedance Micro-Sensor for Metal Debris Monitoring of Hydraulic Oil

An Impedance Sensor for Distinguishing Multi-Contaminants in Hydraulic Oil of Offshore Machinery

Design and Research of Inductive Oil Pollutant Detection Sensor Based on High Gradient Magnetic Field Structure

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