CN-121977822-A - Aviation high-speed Bao Fuban straight gear composite traveling wave resonance experiment and analysis method

CN121977822ACN 121977822 ACN121977822 ACN 121977822ACN-121977822-A

Abstract

The invention provides an aviation high-speed Bao Fuban straight gear composite traveling wave resonance experiment and an analysis method, and relates to the technical field of aviation gear vibration noise. The method comprises the steps of firstly carrying out traveling wave resonance characteristic experiments of the gear shaft and the gear wheel of the auxiliary case booster pump of the aeroengine, then adjusting the engine rotating speed according to a slow sweep range based on the traveling wave resonance characteristic experiments of the gear shaft and the gear wheel of the auxiliary case booster pump of the aeroengine, testing the traveling wave resonance characteristics of the gear shaft and the gear wheel of the auxiliary case booster pump based on noise and stress parameters, and determining the composite traveling wave resonance and the frequency of the gear shaft and the gear wheel of the auxiliary case booster pump at a specific engine rotating speed, wherein the composite traveling wave resonance is superposition of two traveling wave resonances of the gear shaft and the gear wheel of the auxiliary case booster pump at a specific engine rotating speed. The method reveals the dynamic response characteristic and the stress distribution rule of the travelling wave resonance characteristic of the thin radial straight gear under different resonance working conditions.

Inventors

LUAN XIAOCHI
WU CHENGJING
SHA YUNDONG
ZHAO FENGTONG

Assignees

沈阳航空航天大学

Dates

Publication Date: 20260505
Application Date: 20251224

Claims (6)

1. An aviation high-speed Bao Fuban straight gear composite traveling wave resonance experiment and analysis method is characterized by comprising the following steps: Setting up an experimental device, and carrying out traveling wave resonance characteristic experiments of the gear shaft and the large gear of the booster pump of the accessory case of the aero-engine under the ground bench experimental condition; Based on traveling wave resonance characteristic experiments of the gear shaft and the gear wheel of the auxiliary case booster pump of the aeroengine, adjusting the rotation speed of the engine according to a slow sweep, testing the traveling wave resonance characteristic of the gear shaft and the gear wheel of the auxiliary case booster pump of the auxiliary case based on noise and stress parameters, and determining the composite traveling wave resonance and the frequency of the gear shaft and the gear wheel of the auxiliary case booster pump of the auxiliary case at the specific rotation speed of the engine; The composite traveling wave resonance is superposition of two traveling wave resonances with different pitch diameters of the gear shaft and the gear wheel of the accessory case booster pump at a specific engine speed.
2. The experimental device comprises an aircraft engine accessory case experimental main body, a stress measurement system, a derived noise measurement system and a data acquisition and analysis system, wherein the stress measurement system is used for testing the radial stress of an active straight gear in a resonance state, the derived noise measurement system is used for testing vibration noise of a hollow position of the active straight gear shaft, the data acquisition and analysis system collects experimental measured data and analyzes travelling wave resonance characteristics of a large gear of an accessory case booster pump gear shaft of the aircraft engine in a dimension of a frequency domain through programming, and the complex travelling wave resonance state of the large gear of the accessory case booster pump gear shaft at a specific engine speed is determined.
3. The aviation high-speed Bao Fuban straight-gear composite traveling wave resonance experiment and analysis method according to claim 2 is characterized in that the vibration measurement system is provided with three vibration sensors of horizontal (X), vertical (Y) and axial (Z) on the left side of an aircraft engine accessory case respectively; The stress measurement system is used for sticking a plurality of strain gauges on the outer side spoke plate surface of the driving straight gear close to the tooth groove bottom, testing the spoke plate stress of the driving straight gear in a resonance state and transmitting the spoke plate stress to the data acquisition and analysis system; The derived noise measurement system comprises an internal sound waveguide tube, an external sound waveguide tube and a microphone, wherein the internal sound waveguide tube is inserted into a shaft cavity of a booster pump intermediate gear shaft before an experiment, 6 shaft holes are circumferentially and uniformly processed at the installation positions of the booster pump intermediate gear shaft and a large gear, sound waves are transmitted to the internal sound waveguide tube through the shaft holes and then transmitted to the microphone through the external sound waveguide tube, and noise data are transmitted to the data acquisition and analysis system through the microphone.
4. The experimental and analytical method for composite traveling wave resonance of high-speed Bao Fuban straight gear in aviation according to claim 3, wherein the two traveling waves of the composite traveling wave resonance are forward traveling wave superposition or backward traveling wave superposition of different pitch diameters.
5. The aviation high-speed Bao Fuban straight gear composite traveling wave resonance experiment and analysis method is characterized in that an experimental device is adopted to conduct traveling wave resonance characteristic experiment on an original structure accessory case booster pump gear shaft large gear and an improved structure of the original structure accessory case booster pump gear shaft large gear, the original structure accessory case booster pump gear shaft large gear is of a duplex gear structure, the thickness of a web is 4mm, the diameter of the rim is 104.6mm, the thickness of the web of the improved structure is 6mm compared with that of the original structure, and the diameter of the rim is 100mm.
6. The experimental and analytical method for composite traveling wave resonance of high-speed Bao Fuban straight gear in aviation according to claim 5, wherein the composite traveling wave resonance of the accessory case booster pump gear shaft gear wheel at a specific engine speed is based on a rotation coordinate system, and the sum of two traveling wave moving frequencies of the composite traveling wave resonance is equal to the product of the sum of gear meshing excitation frequency and pitch diameter number and the rotation frequency, namely: ; wherein: the travelling wave dynamic frequency with the pitch diameter of a is represented; the traveling wave frequency with the pitch diameter of b is represented, f z represents the rotation frequency of the gear, 、 Represents the propagation direction of the wave in the node diameter type traveling wave vibration behavior, wherein the forward wave Backward wave ; Based on a static coordinate system, the sum of two traveling wave resonance frequencies of the gear composite traveling wave resonance is equal to the gear meshing excitation frequency, namely: ; wherein: representing the forward wave resonant frequency of the pitch diameter number a; representing the forward wave resonant frequency with the pitch diameter of b; Representing the resonant frequency of the backward traveling wave with the pitch diameter of a; the backward wave resonant frequency with the pitch diameter of b is shown.

Description

Aviation high-speed Bao Fuban straight gear composite traveling wave resonance experiment and analysis method Technical Field The invention relates to the technical field of vibration noise of aviation gears, in particular to an aviation high-speed Bao Fuban straight gear composite traveling wave resonance experiment and an analysis method. Background The high-speed Bao Fuban straight gear of aviation is used for reversing and transmitting power in a transmission system of an aircraft engine accessory, and as the aircraft engine is continuously and iteratively developed, the gear transmission system works under severe working conditions such as high speed, heavy load, high power density and the like, so that the structure of the gear transmission system is increasingly complex, the application of the lightweight thin-wall gear is promoted, the rigidity of the lightweight thin-wall gear is weakened, the Traveling Wave Vibration (TWV) of the system is easily caused, and the noise of the system is further abnormal. To obtain the resonance conditions induced by TWV, the most classical approach is to solve the mode shape and node diameter of TWV from the mode space and then derive it from the campbell plot. On this basis, the resonance speed and the traveling wave natural frequency can be calculated. In addition, the travelling wave is abstracted into a load, and the load is directly applied to a structure, so that the response generated by the travelling wave is analyzed, and the analysis of a deeper level requires additional complex theory. Gear resonance has narrow rotational frequency band sensitivity, and fatigue fracture of gears will occur quickly when operating at high speeds, in the range of dangerous rotational speeds with initial defects and concomitant traveling wave resonance. These developments and applications of thin-walled gears have two service problems for the drive train (1) complex and dense resonances, including unpredictable detrimental resonances, at high speed, heavy duty conditions and (2) reduced fatigue resistance due to the thin-walled structure and complex service conditions. Among the above-mentioned detrimental resonances that reduce gear fatigue, traveling wave resonance is the most typical and most frequently occurring detrimental resonant mode, and is a recognized challenge faced by thin-walled gears in high-speed transmission systems. At present, the prior art only derives the expression of the single gear traveling wave resonant frequency and resonant rotating speed, discusses the excitation principle and resonant condition of gear traveling wave resonance, and lacks the research on the composite traveling wave resonance phenomenon and occurrence condition of coexistence of two pitch diameter type traveling wave modes. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a straight gear composite traveling wave resonance experiment and analysis method based on aviation high speed Bao Fuban. In order to solve the technical problems, the invention adopts the technical scheme that the composite traveling wave resonance experiment and analysis method for the high-speed Bao Fuban straight gear of aviation comprises the following steps: Setting up an experimental device, and carrying out traveling wave resonance characteristic experiments of the gear shaft and the large gear of the booster pump of the accessory case of the aero-engine under the ground bench experimental condition; Based on traveling wave resonance characteristic experiments of the gear shaft and the gear wheel of the auxiliary case booster pump of the aeroengine, adjusting the rotation speed of the engine according to a slow sweep, testing the traveling wave resonance characteristic of the gear shaft and the gear wheel of the auxiliary case booster pump of the auxiliary case based on noise and stress parameters, and determining the composite traveling wave resonance and the frequency of the gear shaft and the gear wheel of the auxiliary case booster pump of the auxiliary case at the specific rotation speed of the engine; The composite traveling wave resonance is superposition of two traveling wave resonances with different pitch diameters of the gear shaft and the gear wheel of the accessory case booster pump at a specific engine speed. The experimental device comprises an aeroengine accessory case experimental device body, a stress measurement system, a derived noise measurement system and a data acquisition and analysis system, wherein the stress measurement system is used for testing the radial stress of a driving straight gear in a resonance state, the derived noise measurement system is used for testing vibration noise of a hollow position of the driving straight gear shaft, the data acquisition and analysis system collects experimental measured data and analyzes traveling wave resonance characteristics of a gear shaft big gear of an aeroengine accessory case booster pump in t