Analysis Of The Inherent Characteristic Of Axisymmetric Shell Structure Based On Beam-like Shell Model

Axisymmetric shell structure is common in ships,aeronautics,water conservancy,hydropower and other engineering fields.Structural vibration directly affects the reliability of shell structure.Therefore,the calculation and analysis of the vibration characteristics of axisymmetric shell structure is an important part of structural optimization and safety design.How to accurately and efficiently perform the calculation of the inherent characteristics of the structure has become an important research content of the people.Firstly,based on the theory of Sanders thin shell and classical potential flow theory,the fluid solid coupling shell and beam model of cylindrical shell with incompressible fluid is established by using the axisymmetric characteristics of the structure.The calculation accuracy and the scope of application are preliminarily compared with the other two other axisymmetric isoparametric shell elements.In order to improve the computational efficiency,the finite element Riccati transfer matrix method is introduced on the basis of the beam like shell model.The beam like shell model and finite element Riccati transfer matrix method applied to axisymmetric shell structure(cylindrical shell,conical shell and their composite structure)of inherent characteristics and verify its applicability and accuracy.At the same time,the calculation accuracy and the inherent characteristics of influence factors are discussed.Finally,combining with engineering background,the beam shell mixed model of cylindrical-cone-cylinder combined pipe structure was established and the structural modal experiment was also designed and completed.The reasonableness and accuracy of the mixed model of the beam and shell are verified by the comparison between the calculated values and the experimental results.