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Table 3 The healthy and damage scenarios that have been investigated numerically

From: Railway bridge damage detection based on extraction of instantaneous frequency by Wavelet Synchrosqueezed Transform

Test case

Vehicle-bridge mass ratio (%)

Stiffness reduction (%)

Damaged element (No.)

ρ

δ

Baseline simulation

     

1

10

-

-

1

0

Variable operational condition

     

2

5

-

-

0.94

-0.56

3

15

-

-

0.98

0.35

4

20

-

-

0.97

0.91

5

25

-

-

0.97

1.14

Damage type 1 at L/2

     

6

10

30

1

0.98

0.08

7

10

50

1

0.92

0.30

8

10

70

1

0.90

0.48

Damage type 1 at 3L/4

     

9

10

30

1

0.99

0.02

10

10

50

1

0.98

0.04

11

10

70

1

0.96

0.09

Damage type 2 around mid-span

     

12

10

30

2

0.95

0.18

13

10

30

3

0.92

0.35