In this paper,a high-efficiency aerothermoelastic analysis method based on unified hypersonic lifting surface theory is established.The method adopts a two-way coupling form that couples the structure,aerodynamic forc...In this paper,a high-efficiency aerothermoelastic analysis method based on unified hypersonic lifting surface theory is established.The method adopts a two-way coupling form that couples the structure,aerodynamic force,and aerodynamic thermo and heat conduction.The aerodynamic force is first calculated based on unified hypersonic lifting surface theory,and then the Eckert reference temperature method is used to solve the temperature field,where the transient heat conduction is solved using Fourier’s law,and the modal method is used for the aeroelastic correction.Finally,flutter is analyzed based on the p-k method.The aerothermoelastic behavior of a typical hypersonic low-aspect ratio wing is then analyzed,and the results indicate the following:(1)the combined effects of the aerodynamic load and thermal load both deform the wing,which would increase if the flexibility,size,and flight time of the hypersonic aircraft increase;(2)the effect of heat accumulation should be noted,and therefore,the trajectory parameters should be considered in the design of hypersonic flight vehicles to avoid hazardous conditions,such as flutter.展开更多
This article discusses the challenge of defining the geometry parameters for minimum mass stiffened aircraft panels made of composite materials.The thickness and size of the panel elements are unknown variables,and th...This article discusses the challenge of defining the geometry parameters for minimum mass stiffened aircraft panels made of composite materials.The thickness and size of the panel elements are unknown variables,and the optimal design is based on the condition of equal buckling.To solve this problem,the authors reduce the optimal design problem to the investigation of the weight function with multiple variables using analytical methods and refined buckling theory restrictions.The article introduces novel mathematical relationships for investigating the buckling of structurally anisotropic composite panels.The model couples bending with a plane stress state,resulting in a boundary value problem that involves solving an eighth-order partial differential equation within a rectangular field.To facilitate this,a software package was developed using theMATLAB operating environment.A set of computer programs was created to conduct multi-criteria optimization of the optimal design of structurally anisotropic aircraft composite panels.The study also examines the impact of design parameters on the critical buckling forces for both bending and torsion modes.The results of a new implementation of an optimal size-weight project for carbon-epoxy skin are given.A project with restrictions on the refined buckling theory for structurally anisotropic aircraft panels made of composite materials has been manipulated in terms of plies thicknesses.Optimal solutions are obtained.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.11172025 and 91116005)
文摘In this paper,a high-efficiency aerothermoelastic analysis method based on unified hypersonic lifting surface theory is established.The method adopts a two-way coupling form that couples the structure,aerodynamic force,and aerodynamic thermo and heat conduction.The aerodynamic force is first calculated based on unified hypersonic lifting surface theory,and then the Eckert reference temperature method is used to solve the temperature field,where the transient heat conduction is solved using Fourier’s law,and the modal method is used for the aeroelastic correction.Finally,flutter is analyzed based on the p-k method.The aerothermoelastic behavior of a typical hypersonic low-aspect ratio wing is then analyzed,and the results indicate the following:(1)the combined effects of the aerodynamic load and thermal load both deform the wing,which would increase if the flexibility,size,and flight time of the hypersonic aircraft increase;(2)the effect of heat accumulation should be noted,and therefore,the trajectory parameters should be considered in the design of hypersonic flight vehicles to avoid hazardous conditions,such as flutter.
基金the implementation of the program for the creation and development of the World-Class Research Center“Supersonic”for 2020-2025 funded by the Ministry of Science and Higher Education of the Russian Federation(Grant agreement of April 20,2022№075-15-2022-309).
文摘This article discusses the challenge of defining the geometry parameters for minimum mass stiffened aircraft panels made of composite materials.The thickness and size of the panel elements are unknown variables,and the optimal design is based on the condition of equal buckling.To solve this problem,the authors reduce the optimal design problem to the investigation of the weight function with multiple variables using analytical methods and refined buckling theory restrictions.The article introduces novel mathematical relationships for investigating the buckling of structurally anisotropic composite panels.The model couples bending with a plane stress state,resulting in a boundary value problem that involves solving an eighth-order partial differential equation within a rectangular field.To facilitate this,a software package was developed using theMATLAB operating environment.A set of computer programs was created to conduct multi-criteria optimization of the optimal design of structurally anisotropic aircraft composite panels.The study also examines the impact of design parameters on the critical buckling forces for both bending and torsion modes.The results of a new implementation of an optimal size-weight project for carbon-epoxy skin are given.A project with restrictions on the refined buckling theory for structurally anisotropic aircraft panels made of composite materials has been manipulated in terms of plies thicknesses.Optimal solutions are obtained.
