An optimization method for the eccentricity of the rotor mass center of the engine core machine

Abstract

The invention discloses a method for optimizing centroid eccentricity of an engine core engine rotor. The method for optimizing centroid eccentricity of the engine core engine rotor comprises a first step of taking a minimum value of a core engine rotor joint face centroid eccentricity OC as an optimization target of the method for optimizing centroid eccentricity of the engine core engine rotor; a second step of establishing a core engine rotor centroid eccentricity prediction optimization mathematic model; a third step of obtaining a theta value corresponding when the actual spin axis OC of the labyrinth disc fitting centroid O deviated from the core engine rotor, and performing high pressure turbine rotor and high pressure compressor rotor angle rotation assembly according to the theta value. According to the method for optimizing centroid eccentricity of the engine core engine rotor, before rotor assembly, by optimal calculation, the angular phasing corresponding when the OC value is minimum is selected to guide core engine rotor assembly, and the goal of reducing centroid eccentricity of the core engine rotor and an unbalanced amount of the core engine rotor and improving high voltage rotor vibration is achieved.

Description

technical field [0001] The invention relates to the technical field of aeroengines, in particular to an optimization method for the eccentricity of the rotor mass center of an engine core machine. Background technique [0002] The rotor unbalance of the aero-engine core machine is an important factor determining the vibration response of the engine rotor, and the root cause of the unbalance is that the centroid of each discrete rotor deviates from the actual axis of rotation. A core machine rotor is assembled from a balanced high-pressure compressor rotor (HPC) and a high-pressure turbine rotor (HPT) with self-locking bolts / nuts. According to calculations, when the center of mass eccentricity of the rotor of the core machine is 0.01mm and the rotational speed is 12000r / min, it can generate a centrifugal force of about 400kg, which will break the balance state of the rotor and cause the high-pressure rotor to vibrate. [0003] refer to figure 1 , theoretically, the centroid...

AI Technical Summary

Problems solved by technology

[0005] Although the above core machine rotor assembly process is feasible, the controllability of the key process parameter OC value is poor, and it is easy to cause repeated assembly due to OC retesting out of tolerance during the transfer process, and the high pressure caused by the excessive center of mass eccentricity of the core machine rotor Vibration also occurs from time to time, resulting in low assembly efficiency, indirectly increasing the manufacturing cost of the engine, and there are problems such as the process does not dig out the inherent vibration performance of the existing structure of the machine parts.

Images