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For Case 3, it can be seen from Figure 38(b) and Table 11 that the first three harmonic frequencies predicted by the SF-VE are equal to the corresponding experimental data, and the relative error between the fourth harmonic frequency by the SF-VE and the corresponding experimental is 2.78%. The first four harmonic frequencies predicted by the CB-UF-VE and the MIAB-UF-VE are all equal to the corresponding experimental data.

Table 11

First four order harmonic frequencies of transient pressure at T1 by the viscoelastic models and the experimental data for Case 3

Order	Predicted frequencies and experimental data (Hz)
Order	SF-VE	CB-UF-VE	MIAB-UF-VE	Experimental data
1	0.33	0.33	0.33	0.33
2	1.00	1.00	1.00	1.00
3	1.73	1.73	1.73	1.73
4	2.47	2.40	2.40	2.40

Order	Predicted frequencies and experimental data (Hz)
Order	SF-VE	CB-UF-VE	MIAB-UF-VE	Experimental data
1	0.33	0.33	0.33	0.33
2	1.00	1.00	1.00	1.00
3	1.73	1.73	1.73	1.73
4	2.47	2.40	2.40	2.40

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