Fiber grating sensing device for detecting stress state of water lubricated bearing and monitoring system thereof

Abstract

The present invention discloses a fiber grating sensing device for detecting stress state of a water lubricated bearing and a monitoring system thereof, and solves the problems such as low success rate of fiber grating sensor implantation, short service life and high cost. The fiber grating sensing device of the invention comprises a rubber bearing composed of a plurality of rubber bearing strips;and at least one rubber bearing strip is embedded with a fiber grating sensing unit. The fiber grating sensing unit comprises a capillary axially embedded in the rubber bearing strip, optical fiber encapsulated in the capillary and filler filled between the capillary and the optical fiber. A plurality of gratings are provided on the optical fiber. The monitoring system of the invention comprisesa fiber grating sensing device, a fiber grating demodulator, a host computer, a data comprehensive analysis unit and an alarm and output unit. The invention has the advantages of easy manufacture, lowcost, good reliability, long service life, high accuracy and ability to synchronously and continuously monitoring load, temperature and stress of the bearing.

Description

technical field [0001] The invention relates to a bearing sensor and a monitoring system. Background technique [0002] Water-lubricated bearings are mainly installed at the stern of the ship, soaked in water, and use water as a lubricant to support the rotation of the main shaft of the ship. The rubber bearing pad of the water-lubricated bearing acts as an elastic body, which can effectively suppress the rotational vibration of the rotating shaft and improve the shafting alignment effect. [0003] Using the monitoring system to monitor the stress, temperature, load and other states of rubber bearing pads, and analyze the working characteristics of rubber bearings, it is of great economic significance to enhance the function of water-lubricated bearings, improve service life, guide ship maintenance management, and reduce maintenance costs. . [0004] Since the water-lubricated bearing is immersed in the water environment for a long time, the traditional electrical signal s...

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Problems solved by technology

There is also U.S. Patent No. US7512294B2, which discloses the use of secondary molding technology to lay cross-layered optical fibers on a polymer plane substrate to measure the stress-strain characteristics of multi-layer composite materials, but the structure is relatively complex and inconvenient to manufacture, which is not conducive to large-scale production.

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