Table 8: Percentage error between the computational and experimental results for two-step samples (Group S3). Lowest four nonzero free-free modes.

MethodModal frequencies in Hz
1234

S3-80/250
(A) EXP403.1482126.4604139.8305153.500
(B) NTM420.2122203.9844334.1925605.556
(C) FE(3D)404.1802126.9004153.7005169.800
(D) % error (A, B)−3.9663.5174.484−8.428
(E) % error (A, C)−0.255−0.020−0.333−0.315
S3-80/200
(A) EXP (Figure 12)354.7901727.9002291.4904531.380
(B) NTM367.3811788.4722551.5554660.983
(C) FE(3D)355.2301728.3002318.4004532.200
(D) % error (A, B)−3.5493.38610.192−2.860
(E) % error (A, C)0.1240.0231.1600.018
S3-80/150
(A) EXP335.8591360.0501545.1303778.200
(B) NTM346.2431434.1131638.1743889.033
(C) FE(3D)336.4401364.2001548.5003781.900
(D) % error (A, B)−3.091−5.445−6.021−2.933
(E) % error (A, C)0.1720.3050.2180.097
S3-80/100
(A) EXP337.4001018.2401371.0703221.200
(B) NTM345.9421074.5741424.9923303.837
(C) FE(3D)337.48010241372.9003215
(D) % error (A, B)−2.531−5.532−3.932−2.565
(E) % error (A, C)0.0230.5650.133−0.192