Multi-field Coupled Dynamics Analysis Of Supersonic Composite Cylindrical Shell

Composite material is a new type of material developed in the last century.Because of its superior mechanical properties and mechanical properties,composite material has gradually become a major material needed in the new century.Aerospace has become an important field in the development and practice of advanced composite material technology because of its pursuit of superior performance.The use of composite material can greatly reduce the quality of the aircraft itself,and to ensure stable performance at the same time,also will greatly reduce the demand for energy consumption.During the missile launching process and the uniform flight at high altitude,the various structures on the missile will be subjected to a very severe multi-field coupled flutter mechanical environment,which will directly affect the stability of the missile.Therefore,when designing the overall structure of the missile,it is very necessary to analyze the dynamics of the missile structure and explore the factors affecting the flight stability of the missile.In this paper,the supersonic flying composite missile is simplified into a laminated cylindrical model with axial high-speed motion.The vibration characteristics were analyzed under the condition of multi-field coupling.The main research contents of this thesis are as follows:1)Based on the thin shell theory of,the model of axial high-speed moving metal and composite shell is established,and the basic relations such as equilibrium equation,coordination equation and constitutive equation are derived.The stiffness matrix is calculated,and the kinetic energy and deformation energy of the axially moving cylindrical shell are obtained respectively.The dynamic equation of the axial moving shell is established by Hamilton energy principle.Compare the vibration of metal and composite shells during high-speed flight.2)Based on Matlab,solve the vibration differential equation of the laminated shell,calculate its free vibration characteristics,and according to the stability judgment condition,discuss the influence of rigid-flexible coupling vibration characteristics of high-speed moving shell from different thickness,slenderness ratio and flight speed.3)Considering the aerodynamic force of the high-speed moving shell,the gas-solid coupling dynamic equation of the axial moving shell is derived according to the piston theory,and the simulation solution was carried out by Matlab.The effect of changes in composite paving angle and axial thrust on the high-speed motion stability constant of the housing separately is discussed.4)Considering the temperature change of the high-speed moving shell caused by the thermal environment in flight,derive the thermodynamic coupling dynamic equation of the axial moving shell,and solve the simulation by Matlab.The influence of temperature at different speeds and different angles on the vibration characteristics of high-speed moving shell is discussed respectively.