MFC Layout Optimization Design And Verification For Physical Simulation Of Structure Thermal Deformation

Aiming at the structural deformation problem of hypersonic aircraft caused by aerodynamic heat,a design and manufacturing method of structure-function integrated scale model based on macro fiber composites(MFC)is proposed.The MFC driven deformation of structures is realized to simulate the thermal deformation of structures.In this thesis,the similar relationship between the MFC driven deformation and the thermal deformation of the structure is deduced.The simulation effect of different layout parameters of MFC on the bendingtorsional coupled thermal deformation of composite laminates is analyzed.The comprehensive experiment is carried out to verify the thermal deformation simulation of the control surface.And temperature range that can be simulated in the existing mode is studied.The main research contents of this thesis are as follows:Firstly,based on the piezoelectric constitutive equation and the thermos-elastic constitutive equation,the similar relationship between the MFC driven deformation and the thermal deformation of the structure is deduced.On this basis,the bending deformation of the cantilever beam driven by MFC is equal to the thermal deformation under the temperature field.The relationship between temperature difference and voltage is obtained.The comparison of theory and simulation provides a theoretical basis for the method of simulating thermal deformation of structure by using MFC driven deformation.Secondly,the MFC layout optimization model is established for the simulation of bendingtorsional coupled thermal deformation of laminates.Based on the optimization algorithm of evolution strategy,Isight and ANSYS simulation are used to realize the MFC layout optimization design.The simulation effects of different measuring points,MFC placement angles,different MFC sizes and quantities on the thermal deformation of laminates are discussed.The results show that reducing the size of MFC and increasing the number of MFC can provide more,MFC layout space and flexibility.Thus,the simulation accuracy of thermal deformation is improved.Finally,a comprehensive verification experimental platform is built for the physical simulation of the thermal deformation of the control surface.The thermal deformation of the structure under the non-uniform temperature field is constructed by the experiments and finite element method.The MFC layout parameters of the control surface are obtained by the optimized method according to the structure thermal deformation.The deformation verification test of the control surface scale model driven by the MFC is realized.In this heating mode,the range of temperature difference between measuring points that can be simulated by MFC is studied,and the methods to increase the range of simulation are discussed.