Online monitoring method of misalignment of rigid rotor of rotating machine

Abstract

The invention provides an online quantitative monitoring method of a misalignment fault of a rigid rotor of a rotating machine. The method comprises the steps of: firstly mounting a key phase mark anda key phase sensor on the rotor, and mounting a displacement measurement bracket and an eddy current sensor at a free end of a driven shaft; then, collecting the time length of a certain number of key phases to serve as a period, calculating a normal vector of an end face of the free end of the rotor to serve as a reference normal vector by using a signal mean value of the eddy current sensor atvarious key phase moments within a first period time, and then calculating the normal vector of the end face of the free end of the rotor by using the signal mean value of the eddy current sensor within the subsequent period; and finally, calculating an included angle between a real-time normal vector and the reference normal vector to characterize the misalignment quantity of the rotor. By adopting the online quantitative monitoring method provided by the invention, the misalignment condition of the rigid rotor in an operation phase can be monitored in real time, the hot state alignment condition of the rotor can be monitored, furthermore, the online quantitative monitoring method is suitable for the online monitoring of the rigid rotor, can be promoted and used in enterprises, meets thedevelopment requirements of intelligent rotors, and has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of misalignment fault monitoring of rotating machines, in particular to an online quantitative monitoring method for misalignment faults of rotating machines. Background technique [0002] As one of the common parts of the rotor system, the coupling has the function of transmitting torque and power or protecting the rotor. However, due to factors such as machining errors, installation errors, uneven temperature rise of the foundation, deformation of the base, and other factors, the axis of the adjacent two rotors The lines may be skewed or shifted, i.e. misaligned. Misalignment faults will lead to problems such as increased rotor vibration, increased coupling temperature, and bearing wear, which will affect the service life and operational safety of rotating equipment. Misalignment can be divided into cold state and hot state misalignment. The cold state misalignment refers to the rotor alignment state dete...

AI Technical Summary

Problems solved by technology

The cold state misalignment detection technology is mature, but for the rotor system with obvious temperature gradient distribution during operation, the hot state misalignment has a significant impact

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