Vibration reduction design method for inner and outer casings of aero-engine under condition of extremely low frequency

Abstract

The invention provides a vibration reduction design method for inner and outer casings of an aero-engine under the condition of extremely low frequency. The method comprises the following steps: respectively obtaining vibration transmission characteristics from a fuel regulating mechanism to a vibration reduction point of the outer casing and vibration transmission characteristics from the fuel regulating mechanism to a vibration reduction point of the inner casing; determining the position of a vibration application point of the inner casing, obtaining vibration transmission characteristics from the vibration application point of the inner casing to a vibration reduction point of the outer casing and vibration transmission characteristics from the vibration application point of the innercasing to the vibration reduction point of the inner casing, and establishing a model of the vibration transmission characteristics; designing the vibration application control rate of the inner casing; verifying whether the design meets the performance requirement or not: if not, reselecting the vibration application position of the inner casing, and designing according to the steps. The low-frequency vibration fatigue of engine parts is reduced, and the method has important value for actual engineering.

Description

Technical field[0001]The present invention relates to the field of avionics damping noise reduction, in particular, an aviation engine inside and outdoor dam damping design method.Background technique[0002]Aviation engine requires extremely reliability to reduce the fault rate, which causes a lot of facations in the air engine failure, and the main two types of failures are vibration and oil passage failures. These two types of faults also have a close connection, for example, engine vibration causes fatigue breaks that are fixed to the outer line on the casing to form an oil passage failure. Therefore, reducing engine vibration is one of the important passages of improving reliability. However, because there are many factors that cause engine vibration, it is difficult to reduce the vibration of the engine machine. In fact, due to the key components of the engine control system such as electronic controller, external line system, the fuel adjustment mechanism, etc., the engine mach...

AI Technical Summary

Problems solved by technology

However, the current treatment methods for this problem are only design suggestions for adjusting the critical speed, adjusting the preload, and considering the dynamic compliance of the support and connecting structures, and have not fundamentally proposed the relevant treatment methods for the control of extremely low frequency vibration of the engine

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