Dynamic Analysis Of Composite Conical-Cylindrical Shell Moving In High Speed

Composite structures are widely used in engineering structures for their excellent designing and mechanical properties.Because of the need of lightweight,composite material is often used in missile structures.The missile structure is often in the complex working conditions of high speed,high temperature and high load in flight.Rigid body motion,aerodynamic load and temperature load acting on the structure can change the structural vibration characteristics and stability resulted in the collapse of the missile.In this paper,the moving missile is modeled as a composite conical-cylindrical shell.The dynamic equation of the shell is established and solved numerically.The dynamic characteristics of the shell are studied.The research contents are as follows:1)Based on lesner’s thin shell theory and composite laminated theory,the kinetic energy and strain energy of axially moving composite conical-cylindrical shell are given.Based on the generalized Hamiltonian principle,the dynamic governing equations of axially moving composite conical-cylindrical shell are established.Jacobian polynomials and Fourier series are used as displacement functions along generatrix and circumference,the boundary conditions and continuity conditions are simulated by introducing a constrained spring.Based on Galerkin method,the dynamic equations of axially moving composite conical-cylindrical shells are discretized and solved numerically,the results are compared with those in the literature.2)Based on the equation of state,the effect of rigid body motion on the vibration stability of composite shells is studied.The influence of thickness,length and half vertex angle of composite shell on the stability of composite shell is studied.The modal analysis of composite shells with different lengths and different half vertex angles is carried out.3)Considering aerodynamic load and axial force,the effect of ply angle on vibration stability of composite shell is studied.The modal analysis of composite shells with different ply angles is carried out.4)Considering the temperature load,the influence of ply angle on the vibration stability of composite shell is studied,and the modal analysis of composite shell with different ply angle is carried out.