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국내 최대 기계 및 로봇 연구정보
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  • 시편연마기 Minitech 233~365 series
  • 공학설계D/B

    공학설계D/B 게시판 내용
    Volume Title Vibration and Acoustic Fatigue
    Volume No Natural frequencies of shell structures (thin/thick walled, stiffened or unstiffened).
    DATA Title Natural frequencies of thick-walled isotropic circular-cylindrical shells (shear diaphragm end conditions).
    DATA Item 81018
    KEYWORD circular, cylinder, flexural, frequency, natural, program, shell, thick, torsion
    ISBN 0 85679 348 5
    ABSTRACT ESDU 81018 provides graphical data and a Fortran program for the estimation of the lower natural frequencies of thick-walled isotropic, circular cylinders based on the three-dimensional theory of elasticity for hollow cylinders. The data on both flexural and torsional vibrations are applicable to initially unstressed, isotropic shells having shear diaphragm end conditions. The geometric parameters and mode numbers for which the differences between natural frequency given by the three-dimensional elastic theory and thin-shell theory are more than 1 per cent and 5 per cent are indicated. General information is given on the flexural and torsional modes of free vibration of thick-walled shells. The thickness modes, which are not included in the model when shells are modelled as thin-walled, are discussed. The variations of displacements and stresses through the wall thickness, obtained using the computer program provided, are discussed and the effects of Poissonchr(39)s ratio on the natural frequencies are considered. To give guidance on the desirability of modelling shells as either thin-walled or thick-walled, the range of applicability of thin-shell theories is discussed and specific information is given for a wide range of shell geometries. A worked example, which illustrates the application of these data, is given as well as the computer output for this example. The program is available on disc (uncompiled) in the software volume as ESDUpac A8118.

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