1. The document describes using ANSYS to simulate guided wave propagation in pipes. 2. Key steps in the ANSYS simulation include defining the element type, material properties, geometry, meshing, applying boundary conditions like supports, and inputting a loading signal to excite the guided waves. 3. The simulation can then analyze wave propagation over time and visualize the results to study features like welded supports, bends, and corrosion affecting guided wave modes like the L(0,1) and T(0,1) modes.

1. Guided Wave Propagation
simulated by ANSYS
Lee Ping Hung
Taiwan
2016.11

2. Step by Step

3. Step by Step
2.5m
260 mm
A
B C
4 m
End A : excitation
1 m
Support Bracket
End B
100 mm
Model Loading
Post 1Post 26
Predict the
reflected signal
Visualize wave
propagation

4. Element

5. Material

6. Geometry

7. Mesh
Axial
Circumferential
Le
N
=0.05λ
=15

8. Coordinate System Transfer
1. Change CS of WorkPlane to Cylindrical
2. Transfer the CS of all nodes from Cartesian to Cylindrical

9. Loading Signal by Matlab or EXCEL

10. Copy Loading Signal
Copy
DATA: H
Copy
DATA: t

11. Loading Signal in txt format
Past it to Note,
then create an
txt file

12. Array Parameter Table for loading signal
Create the Array Parameter Table (167×1)
1.
2.
3.

13. 4.
5.
6.
Using the ‘txt file’
for Loading Signal

14. SOLUTION: Transient Analysis

15. Setup the (ITS)
Time for analysis
dt< 0.8×(Le/Velocity)

16. Apply the loading signal on the nodes

17. Axis-symmetric Loading for L or T modes
T(0,1)

18. Solve
• If you need more steps
than1000, you have to
input below instruction
before you solve
• finish
/config,nres,5000
/SOLU
SAVE
/STATUS,SOLU
SOLVE

19. POST 1: see wave propagation

20. POST 26: collect the time domain
signal for the parameter you select

21. POST 26

22. Guided Wave with different features on pipes
檢測盲區
General Corrosion Pipe Support
Elbow Coating

23. L modes and T(0,1) mode
L(0,1) and L(0,2) mode T(0,1) mode

24. T(0,1) V.S L-Welded Support

25. T(0,1) V.S C-Welded Support

26. T(0,1) V.S Angle Bend

27. T(0,1) V.S General Corrosion