Reverse method for calculating oil film characteristic parameters of sliding bearing based on load reconstruction

Abstract

The invention discloses a method for measuring the characteristics of a sliding bearing film. The method is built on the basis of a rotor-sliding bearing system imbalance response finite element analytical model, and carries out the calculation and inverse calculation of the characteristic parameters of the sliding bearing film through the test measurement data on a rotor. The method comprises the steps: firstly enabling the support of the sliding bearing film for the rotor to be equivalent to two radial boundary loads for constraint, i.e., equivalent film loads; secondly carrying out accurate and stable reconstruction of the equivalent film loads based on a regular dynamic load recognition method through employing a measured rotor imbalance response; finally building a mapping relation between the equivalent film loads and the characteristic parameters of the sliding bearing film, and recognizing the characteristic parameters of the sliding bearing film through a least square method. The method can obtain the characteristic parameters, which are difficult to obtain through a conventional method, of the sliding bearing film accurately and effectively, wherein the characteristic parameters of the sliding bearing film comprise a gird characteristic parameter and a damping characteristic parameter of the film.

Description

technical field [0001] The invention belongs to the technical field of sliding bearing oil film characteristic measurement, and in particular relates to a sliding bearing oil film characteristic parameter identification method based on equivalent dynamic load reconstruction. Background technique [0002] The fluid-solid coupling dynamic characteristics of the rotor-sliding bearing system are jointly affected by the rotor and the sliding bearing. The oil film characteristic parameter of the sliding bearing is one of the key factors affecting the dynamic characteristics of the system. For the rotor-sliding bearing system, the instability of the rotor movement caused by the oil film load of the sliding bearing is a prominent problem, and the oil film characteristic parameters of the sliding bearing are an important factor that directly affects the calculation of the dynamic characteristics of the electric spindle and the stability analysis. With the development of the electric...

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Problems solved by technology

For complex oil chambers, it is difficult to solve the oil film characteristics comprehensively and accurately from the perspective of theory or numerical analysis

Relying on experimental tests, limited by technical or economic conditions, it is difficult or even impossible to directly measure the oil film characteristic parameters of sliding bearings.

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