Research Article

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

Table 7

Variation of natural frequencies (Hz) of a three-layered simply supported-simply supported cylindrical shell ( , , , , ).

Type 1Type 2Type 3Type 4

113.276913.891613.519313.9734
24.45144.63014.56854.7054
33.60843.81234.05534.2354
45.77946.21816.75197.1280
59.16139.902310.758311.3856