Fig.1

Vibration source and influence of whole aeroengine

Fig.2

Structure diagram of aeroengine

Fig.3

Variation trend of typical vibration of aeroengine

Fig.4

Bode diagram of vibration response from aeroengine

Fig.5

Waterfall diagram of vibration response of aeroengine

Fig.6

Arrangement diagram of vibration monitoring points

Fig.7

Structure modification diagram of aeroengine

Fig.8

Test schematic diagram of low-pressure rotor key-phase signal

Fig.9

Test schematic diagram of high-pressure rotor key-phase signal

Fig.10

Response comparison before and after vibration mutation

Fig.11

Wavelet analysis result during vibration

Fig.12

Response curves of 2 vibration state of bearing block

Fig.13

Variation characteristics of working vibration models of rotor pivot before and after vibration mutation （N2=14 400 r/min）

Fig.14

Motion tracks and characteristics of primary phase points of pivot during vibration mutation

Fig.15

Calculation results of critical speed and Campbell of aeroengine

Fig.16

Synchronous circular motion model of rotor

Fig.17

Arrangement diagram of monitoring points

Fig.18

Time-domain waveform diagram before and after vibration mutation-compressor level 3

Fig.19

Frequency spectrum of abnormal vibration-compressor level 3

Fig.20

Orbit of shaft center of compressor level 3

Fig.21

Time-domain waveform diagram before and after vibration mutation-compressor level 8

Fig.22

Frequency spectrum diagram of abnormal vibration mode-compressor level 8

Fig. 23

Orbit of shaft center of compressor level 8

Fig.24

Time-domain waveform diagram before and after vibration mutation-high-pressure turbine

Fig.25

Frequency spectrum diagram of abnormal vibration mode-high-pressure turbine

Fig.26

Orbit of shaft center of high-pressure turbine

Fig.27

Rotor elastic line changing rule during vibration mutation

Fig.28

Dynamic properties test diagram of core engine rotor at full speed

Fig. 29

Modeling diagram during modal test of core engine rotor

Fig.30

Core engine elastic line changing rule at high and low speed

Fig.31

Mathematical description methods for rotor angle deformation of core engine

Fig.32

Mathematical description methods for included angle of core engine rotor and rotation axis

Fig.33

Changing rule of included angle of core engine rotor and rotation axis

Fig.34

Changing rule of rotor angle deformation of core engine

Fig.35

Frequency response function from modal test of core engine rotor

Fig. 36

Vibration model diagram from modal test of core engine rotor

Table 1

Inherent frequency test results for core engine rotor with different torques

Fig.37

Test schematic diagram of dynamic characteristics of whole stator casing

Fig.38

Modal test diagram of whole engine including full stator casing

Fig.39

Excitation force test result of rotating excitation device

Fig.40

Measuring result of vibration response

Fig.41

Dynamic compliance test and research result of full stator casing

Fig.42

Two-bending vibration model diagram of full stator casing in whole engine modal test

Fig.43

Three-bending vibration model diagram of full stator casing in whole engine modal test

Fig.44

Waterfall of normal vibration response

Fig.45

Matching diagram of theoretical and experimental characteristics of rotor unbalance excitation mutation

Fig.46

Vibration response change diagram before and after core engine balancing