Fig.1

Schematic diagram of acoustic propagation characteristic parameters

Fig.2

Schematic diagram of installation angle of stator blade and rotor blade row

Fig.3

Schematic diagram of installation angle mapping of rotor blade row

Fig.4

Schematic diagram of modal propagation angle

Fig.5

Acoustic propagation characteristics of certain stator blade row

Fig.6

Acoustic reflection characteristics of compressor stage stators

Fig.7

Acoustic transmission characteristics of compressor stage stators

Fig.8

Acoustic reflection characteristics of compressor stage rotors

Fig.9

Acoustic transmission characteristics of compressor stage rotors

Fig.10

Calculation of acoustic mode propagation at characteristic frequency

Fig.11

Calculation of blade excitation frequency by acoustic mode

Fig.12

Calculation of acoustic mode propagation characteristics of compressor

Fig.13

Calculation of acoustic mode propagation characteristics of R1

Fig.14

Schematic diagram of dynamic test points of certain type of compressor

Fig.15

Diagram of long scan test characteristics of certain type of compressor

Table 1

Dynamic stress test results of 1st rotor

Fig.16

Test operation of certain type of compressor

Fig.17

Relation between main frequency of blade vibration and rotational speed

Fig.18

Blade dynamic stress frequency spectrum of 1st rotor

Fig.19

Pressure pulse test point frequency spectrum of 1st rotor

Fig.20

Distribution of pressure pulse test points after IGV

Table 2

Phase analysis result 1 of pressure pulse after IGV

Table 3

Phase analysis result 2 of pressure pulse after IGV

Fig.21

Fitted curves of pressure pulse phase analysis after IGV

Fig.22

Distribution of pressure pulse test points on R2

Table 4

Phase analysis result 1 of pressure pulse on R2

Table 5

Phase analysis result 2 of pressure pulse on R2

Fig.23

Fitted curves of pressure pulse phase analysis on R2

Fig.24

Axial distribution of pressure pulse test points

Fig.25

Axial distribution of pressure pulse amplitude

Fig.26

Phase analysis of rotor blade vibration on 1st rotor