Design And Dynamical Simulation Analysis Of Connection Structure For MTPS Panels

Hypersonic vehicle uses rigid connection structure for connecting metallic thermal protection system(MTPS) and airframe structure. Rigid connection structure constraints relative thermal deformation between the upper and lower MTPS panels accounting for different extent thermal expansion, which leads large thermal stress so that the structure strength decreases significantly. According to that conclusion, it is pretty necessary to design an elastic connection structure in order to implement multi-functions as thermal stress elimination, effective vibration attenuation, strong carry capacity and brilliant maintainability aiming at resolving hypersonic vehicle thermal protection and thermal stress elimination issues.An elastic connection structure applied in MTPS is designed, including structure design, materials determination and dimension design of all the components. Moreover, the 3D structure drawings and the overall design framework are accomplished. As an important component in the elastic connection structure, optimization design of the spring geometric coefficient for the purpose of light weight and high stiffness is conducted. In addition, through combining MSC PATRAN finite element(FE) simulation analysis and MATLAB programming iterative, mechanical characteristics as stiffness, transient response and frequency response ones of spring with large deformation are researched.Thermodynamic characteristics of MTPS with elastic and rigid connection structure is analyzed and compared based upon FE, including thermal stress analysis under un-uniform temperature field, thermal stress analysis under impact load and vibration response analysis under random load spectrum excitation of MTPS with thermal deformation. The analysis results indicate that when the surface of MTPS suffers from impact load or random load, elastic connection structure is more effective than rigid one for eliminating structure thermal stress and decreasing vibration response of the hypersonic vehicle structure.