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