Method for measuring dynamic oil film pressure distribution of sliding bearing in real time

Abstract

The invention relates to a method for measuring dynamic oil film pressure distribution of a sliding bearing in real time. The method comprises the following steps of: (1) manufacturing at least one special sliding bearing, wherein the special sliding bearing is provided with a piezoelectric sensor array, the piezoelectric sensor array is uniformly distributed in the bearing and is used for converting oil film pressure stressed by the sliding bearing into an electric signal and outputting the electric signal; (2) arranging at least one special sliding bearing on a sliding bearing measuring platform; and (3) connecting a signal conditioning acquisition circuit to the special sliding bearings through the piezoelectric sensor array, wherein the signal conditioning acquisition circuit is used for processing a noise-containing weak electric signal output by the piezoelectric sensor array and converting the weak electric signal into a signal which can be identified. The method can accurately measure the dynamic oil film pressure distribution under the condition that the flow, boundary condition, pressure distribution and other characteristics of the oil film are not damaged, and has great theoretical significance and application value for improving the dynamic characteristic forecast accuracy of the sliding bearing and improving the shafting vibration design level.

Description

technical field [0001] The patent of the present invention relates to the research field of dynamic characteristics of a rotating machine, especially a method for real-time measurement of the dynamic oil film pressure distribution of a sliding bearing. Background technique [0002] As one of the most commonly used bearings in rotating machinery, sliding bearings are widely used in power equipment such as steam turbines, gas turbines, aero engines, and ship propulsion shafting. Its dynamic characteristics have a very significant impact on the overall dynamic characteristics of rotating machinery. Due to its complex working mechanism and the strong nonlinear characteristics of the oil film, it is still impossible to predict it accurately, and the difference between theory and experiment is obvious. Accurately obtaining bearing support characteristics has always been one of the difficulties in this field. At present, the acquisition of oil film pressure at home and abroad most...

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Problems solved by technology

[0004] To sum up, the existing technology has the following deficiencies: since the acquisition of the oil film pressure mostly depends on theoretical calculations and indirect measurements, and the flow, boundary and pressure distribution of the oil film itself in the actual work of the sliding bearing may be different, Therefore, it is impossible to obtain the precise value of the oil film pressure in real time

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