Table 4 Resonance frequencies obtained by experimental tests for Model 3 and Model 4

Model 3

H ₁₂

33.13

84.38

139.1

211.9

318.1

423.1

H ₁₃

33.13

81.88

124.1

212.5

296.3

418.8

H ₁₄

33.75

86.88

142.5

222.8

321.9

426.3

Model 4

H ₁₂

36.88

90.31

140.6

216.9

310.3

426.3

H ₁₃

36.88

88.13

126.9

219.1

286.6

427.2

H ₁₄

36.88

94.69

147.8

229.1

312.8

434.1

Δ ^(*) : H ₁₂

11.32%

7.03%

1.08%

2.36%

2.45%

0.76%

Δ ^(*) : H ₁₃

11.32%

7.63%

2.26%

3.11%

3.27%

2.01%

Δ ^(*) : H ₁₄

9.27%

8.99%

3.72%

2.83%

2.83%

1.83%