Effect of viscous heating of the fluid damper on the whole-spacecraft vibration isolation

During a launch mission, the fluid damper has different damping coefficient and resonance frequency for the fluid viscosity is a function of the fluid temperature. A thermodynamic model is established by considering the application of the fluid damper in the whole-spacecraft vibration isolation. And the frequency domain performances of the whole-spacecraft vibration isolation systems at some time intervals are numerically studied with different viscosity-temperature coefficients and different parameters. The theoretical analysis and experimental results show that with the past of the time, the temperature of the damper increased, and thus resulted in a shift of the resonance frequency and the changes of the resonance amplitude.