Research Article

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

Table 12

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

Shell type

Type 116527.316527.336527.336527.35
26690.306690.326690.336690.34
36953.446953.456953.476953.48
47305.797305.817305.827305.84
57734.997735.017735.027735.04
68228.818228.828228.848228.86

Type 216542.666542.676542.686542.69
26706.046706.056706.066706.07
36969.796969.806969.8146969.83
47322.957322.977322.987323.00
57753.137753.157753.167753.18
68248.078248.098248.128248.12

Type 316580.756580.756580.766580.77
26745.06745.046745.046745.05
37010.277010.277010.287011.0
47365.467365.477365.487365.49
57798.157798.167798.177798.18
68296.018296.028296.038296.04

Type 416591.616591.626591.636591.63
26756.176756.176756.186756.19
37021.847021.857021.877021.87
47377.617377.627377.637377.64
57811.007811.017811.027811.03
68309.668309.678309.688309.69