Method and device for balancing fan rotor of aviation turbofan engine

Abstract

The invention provides a method and device for balancing a fan rotor of an aviation turbofan engine, and relates to the field of aviation engines. The method for balancing the fan motor of the aviation turbofan engine comprises the steps of obtaining the vibration amplitude of the fan rotor and the vibration amplitude of a low-pressure turbine rotor; determining an imbalance position of the aviation turbofan engine according to the vibration amplitude of the fan rotor, the vibration amplitude of the low-pressure turbine rotor and an inherent vibration peak coefficient of the low-pressure turbine rotor; and balancing the aviation turbofan engine through balancing the imbalance position. According to the method provided by the invention, the vibration amplitude can be measured respectively at the fan rotor end and the low-pressure turbine rotor end, and the imbalance position of the aviation turbofan engine is analyzed and determined, thereby performing the balancing operation in a moretargeted manner, avoiding the problems of poor effect and low efficiency caused by blind balancing for the fan rotor when the low-pressure turbine rotor gives rise to imbalance, optimizing the balancing effect, and improving the balancing efficiency.

Description

technical field [0001] The invention relates to the field of aeroengines, in particular to a method and a device for balancing a fan rotor of an aero turbofan engine. Background technique [0002] In order to increase the bypass ratio of modern civil aviation turbofan engines to reduce fuel consumption, the diameter of the fan is usually large, and it is difficult for a general dynamic balancing machine to meet the size and power requirements of the large-diameter fan rotor balance. Therefore, it is usually performed on the balancing machine first. The low-pressure turbine rotor dynamic balance and the fan disk shaft plus booster stage rotor assembly are dynamically balanced, and then the entire low-pressure rotor is locally balanced during the bench test run after the engine assembly is completed. [0003] In the prior art, the local balancing system of the low-voltage rotor analyzes the signal of the low-voltage speed sensor with key phase and the vibration sensor signal a...

AI Technical Summary

Problems solved by technology

However, due to problems such as wear and tear during assembly and service, the low-pressure turbine rotor still has the possibility of exceeding the required unbalance, and the vibration sensor at the fan end is also sensitive to the unbalance of the low-pressure turbine rotor

If only the vibration sensor signal at the fan end is analyzed, it will not be possible to determine whether the unbalance comes from the fan rotor or the low-pressure turbine rotor

In this case, it will be difficult to achieve the balance target only by trimming at the fan end, which will result in failure to achieve the balance requirement after multiple drive balances, consuming time, manpower, financial resources and other resources

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