Research Article

Vibrations of Three-Layered Cylindrical Shells with FGM Middle Layer Resting on Winkler and Pasternak Foundations

Table 11

Variations of natural frequencies (Hz) of SS-SS cylindrical shell for different values of G, where  N·m, , , , .

Shell type

Type 116527.316528.006528.866529.95
26690.306691.126692.146693.43
36953.446954.456955.716957.31
47305.797307.057308.607310.57
57734.997736.497738.357740.71
68228.818230.548232.688235.40

Type 216542.666543.386544.276545.40
26706.046706.886707.936709.26
36969.796970.836972.126973.75
47322.957324.237325.817327.82
57753.137754.667756.547758.93
68248.078249.828251.998254.73

Type 316580.756581.156581.616582.14
26745.06745.516746.076746.70
37010.277010.877011.567012.37
47365.467366.217367.087368.09
57798.157799.067800.117801.32
68296.018297.078298.298299.70

Type 416591.616592.026592.506593.05
26756.176756.666757.226757.88
37021.847022.457023.167023.98
47377.617378.387379.267380.28
57811.007811.927812.987814.21
68309.668310.738311.968313.38