fig18
![Time-domain instability mechanism for artificial boundary condition of semi-infinite medium described by discrete rational approximation](https://image.oaes.cc/200a98ce-4b02-453e-8ae6-851f6f45ceac/dpr3038.fig.18.jpg)
Figure 18. Dynamic characteristic of structure with different structural frequencies.
Figure 18. Dynamic characteristic of structure with different structural frequencies.
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