Design method of intermediate bearing roller number in aero-engine

Abstract

The application belongs to the field of aero-engines, and particularly relates to a design method of the number of intermediate bearing rollers in an aero-engine. The method comprises the following steps: step one, obtaining statistical data of the passing frequency and vibration amplitude of each stage of fan blades in the whole machine test run, and determining the target passing frequency of the fan blades and the rotation speed of the high and low pressure rotors in the typical test run; step two, determining the number of intermediate bearing rollers, and calculating the variation curve of the characteristic frequency of the intermediate bearing of the engine with the rotation speed; step three, judging whether the relationship between the target passing frequency of the fan blades and the characteristic frequency of the intermediate bearing meets the requirements, if yes, the number of intermediate bearing rollers meeting the requirements is obtained, and if no, the number of intermediate bearing rollers is determined again in step two. The design method of the number of intermediate bearing rollers in the aero-engine is simple, effective, low in cost, and involves small changes, and is easier to implement.

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