FREE-VIBRATIONS OF CIRCULAR CYLINDRICAL-SHELL ON WINKLER AND PASTERNAK FOUNDATIONS

Free vibrations of a thin circular-cylindrical shell in contact with a n elastic medium are investigated, employing membrane theory. Response of the elastic medium is represented by Winkler/Pasternak models. Dyn amic characteristics involving nondimensional frequency parameters and axial wave parameters are drawn. It is found that the value of the fo undation modulus (K), considerably affects radial vibrational mode fre quency, while the other two vibrational mode frequencies, i.e. torsion al and longitudinal, remain almost unaffected. It is found also that t he influence of the nondimensional shear modulus parameter ((G) over b ar), is more pronounced in radial vibrational mode frequencies, to a l esser extent on torsional mode frequencies and least on longitudinal m ode frequencies. Copyright (C) 1996 Elsevier Science Ltd.