Thermal Response of a Truss Antenna Considering Friction Joints Using Improved HHT-α Method

Large ring truss antennas on satellites are exposed to a temperature environment while in orbit. Due to transient variations in the external heat flow, adjustments to the attitude of the satellite, changes in orbital positions, and interactive shielding effects between components, this thermal environment changes over time. Because of the temperature gradient and disparity in thermal expansion coefficients across the materials, the components in contact with the articulated head and connecting beam of the ring truss antenna would experience various degrees of thermal strain in this transient thermal condition. The nonlinear joint head in particular would easily experience a thermally induced stick-slip phenomenon due to the friction factor, thermal stress accumulation, and thermal deformation mismatch. An improved HHT-$\alpha$ method is suggested to deal with this thermal-dynamic response, and the findings are contrasted with those obtained using finite element analysis software. In comparison to calculations made using the implicit direct integration method of finite element software, the findings demonstrate that the method is suitable for solving the joint friction model of the Rising static friction model with a temperature-dependent friction coefficient.