Abstract
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.
Highlights
The cleanliness of hydraulic oil can reflect the service life of the oil and the wear state of hydraulic machinery
The oil condition monitoring of offshore machinery is still based on off-line detection methods, such as analysis of physicochemical properties, ferrograph analyzer [3], and spectrometer [4]
It is very important for fault diagnosis and safe operation of equipment to obtain accurately the information reflected by the hydraulic oil
Summary
Hydraulic technology is widely used in the ocean engineering field, such as offshore drilling platforms, offshore wind turbine, and ships. The oil condition monitoring of offshore machinery is still based on off-line detection methods, such as analysis of physicochemical properties, ferrograph analyzer [3], and spectrometer [4]. The impedance sensor proposed in this paper has two detection modes: the inductanceresistance mode is used to detect metal debris, and the capacitance mode is used to distinguish water droplets and air bubbles. Many methods such as optimizing sensing unit structure, enhancing magnetic field strength and adopting coil-based resistance parameter are integrated to improve the detection ability of sensor. The impedance sensor can be used as the core sensing element of the portable device for onsite monitoring, thereby obtaining the health condition of offshore hydraulic machinery
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