Transient analysis method of aerothermoelasticity based on ARMA model

A novel time-domain method is introduced to address the challenges of aerothermoelastic analysis in the rapidly changing transient thermal environments for hypersonic vehicles. The present method strikes a balance between the computational accuracy and the efficiency. Firstly, the autoregressive moving average (ARMA) model is used to replace the aerodynamic simulations. Subsequently, a time-domain method for aeroelastic analysis is established by coupling the ARMA model and the modal superposition method. Thereafter, the aerodynamic heating is calculated by using the numerical method based on Euler equations in conjunction with the established engineering techniques. The transient thermal field is simulated by using the bidirectional coupling of aerodynamic heating, heat conduction and heat radiation. Finally, based on the hierarchical coupling strategy, an efficient and accurate time-domain method for aerothermoelastic analysis in the transient thermal environment is presented. This method utilizes the structural mode as a connecting hub between aeroelastic analysis and transient thermal field simulation. The performance of the present method for aerothermoelastic analysis is evaluated by using the hypersonic wing. Results indicate that computational efficiency is improved by about 3.5 times comparing with the aerothermoelastic analysis method that directly employs the RANS method for aerodynamic calculations. Meanwhile, the relative error in the thermal flutter boundary is below 12%.