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Coordinate System selection for 128 YX LiNbO3 - surface acoustic wave
Posted Sep 27, 2013, 9:51 a.m. EDT 1 Reply
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I am trying to simulate a surface acoustic wave device using 128YX lithium niobate. I have generated the rotated matrix for the Euler angle (0,38,0) - attached file has the properties.
Now, I have a doubt in selecting the coordinate system for the piezoelectric material- is it the Material XZ plane system that needs to be selected? (Assuming that the COMSOL coordinate maps to the local coordinates of the rotated piezoelectric material, where the wave propagates in the X direction and the axis normal to the cut being the Z axis) Is my understanding correct?
Please correct me if I am wrong? My simulation output doesn't seem to be correct, so I am confused if its the orientation that is wrong, or is it the boundary /loads that's causing the issue.
Thanks & Regards,
Rahul Kishor
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Hello Rahul Kishor
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my rotate matrix almost the same to you.
can you share your model?
EPS =
43.6 0 0
0 38.127 -7.0055
0 -7.0055 34.633
EK =
0 0 0 0 4.4724 0.27875
-1.8804 4.4466 -1.5221 0.067383 0 0
1.7149 -2.692 2.3135 0.63381 0 0
CE =
2.03e+11 7.0072e+10 5.7928e+10 1.2851e+10 0 0
7.0072e+10 1.9442e+11 9.0764e+10 9.6691e+09 0 0
5.7928e+10 9.0764e+10 2.2205e+11 8.5299e+09 0 0
1.2851e+10 9.6691e+09 8.5299e+09 7.5764e+10 0 0
0 0 0 0 5.6953e+10 -5.0999e+09
0 0 0 0 -5.0999e+09 7.8047e+10