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Guided Wave Propagation simulated by ANSYS
Lee Ping HungTaiwan2016.11
Step by Step
Step by Step
2.5m
260 mm
A
B C
4 m
End A : excitation
1 mSupport Bracket
End B
100 mm
Model Loading
Post 1Post 26
Predict the reflected signal
Visualize wave propagation
Element
Material
Geometry
Mesh
AxialCircumferential
LeN
=0.05λ=15
Coordinate System Transfer
1. Change CS of WorkPlane to Cylindrical
2. Transfer the CS of all nodes from Cartesian to Cylindrical
Loading Signal by Matlab or EXCEL
Copy Loading Signal
CopyDATA: H
CopyDATA: t
Loading Signal in txt format
Past it to Note, then create an
txt file
Array Parameter Table for loading signalCreate the Array Parameter Table (167×1)
1.
2.
3.
4.
5.
6.Using the ‘txt file’ for Loading Signal
SOLUTION: Transient Analysis
Setup the (ITS)
Time for analysis
dt< 0.8×(Le/Velocity)
Apply the loading signal on the nodes
Axis-symmetric Loading for L or T modes
T(0,1)
Solve
• If you need more steps than1000, you have to input below instruction before you solve
• finish /config,nres,5000 /SOLU SAVE/STATUS,SOLUSOLVE
POST 1: see wave propagation
POST 26: collect the time domain signal for the parameter you select
POST 26
Guided Wave with different features on pipes
檢測盲區
General Corrosion
Pipe Support
Elbow Coating
L modes and T(0,1) mode
L(0,1) and L(0,2) mode T(0,1) mode
T(0,1) V.S L-Welded Support
T(0,1) V.S C-Welded Support
T(0,1) V.S Angle Bend
T(0,1) V.S General Corrosion