Method for testing and identifying dynamic characteristic coefficients of sliding bearing

Abstract

The invention discloses a method for testing and identifying dynamic characteristic coefficients of a sliding bearing. The method comprises the following steps of: (1) fixing a bearing to be identified on a test bed; (2) arranging a key phase mark which serves as a reference for subsequent rotational speed analysis and key-phase synchronous acquisition analysis on a shaft segment of a rotation shaft, wherein the shaft segment of the rotation shaft is the part, which is positioned between the bearing and a power input end of a rotation shaft, of the rotation shaft; (3) applying unbalanced force which serves exciting force to the shaft segment of the rotation shaft; (4) raising the speed of the rotation shaft up to the test speed, and respectively measuring a dynamic strain signal of the shaft segment of the rotation shaft and the vibration displacement of the rotation shaft relative to the bearing; (5) computing the dynamic load which is born by the bearing according to the dynamic strain signal of the shaft segment of the rotation shaft; (6) substituting the dynamic load of the bearing and the vibration displacement of the rotation shaft into a computational formula corresponding to the lubrication theory of the bearing to obtain two sets of solving equations; (7) changing the unbalanced force to obtain another two sets of solving equations; and (8) solving the four sets of solving equations to obtain the dynamic characteristic coefficients of the bearing. By the method, large-sized bearings can be tested, large-sized equipment such as a vibration exciter is not required, and the identification result is accurate.

Description

technical field [0001] The invention relates to a test identification method for the dynamic characteristic coefficient of a sliding bearing of a rotating machine, which belongs to an upright test method and can provide test data for technicians to analyze the dynamic characteristic of a sliding bearing, and is mainly used in large rotating machinery in industries such as electric power, metallurgy, and petrochemical industry , such as steam turbines, compressors, generators, gas turbines, pumps, fans, etc. Background technique [0002] Sliding bearings are important components of large rotating machinery, which play a key role in supporting the rotor and are crucial to ensure the safe and stable operation of the unit. In the rotor-sliding bearing system, the dynamic characteristics of the bearing have a great influence on the dynamic characteristics of the system, such as unbalanced response, critical speed, stability, etc., and are the main considerations in unit design, f...

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Problems solved by technology

[0014] The inversion test method needs to be equipped with special equipment to hang the bearing for testing, and the test workload is relatively large, which is difficult for large bearings

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