Analysis Of Thermal Vibration Of Space Heat Pipe Under Alternating Temperature

During the period of in-orbit operations,spacecraft will stay in complicated space environment.For some harsh environment such as the alternating temperature occurring when spacecraft go into or out of Sun’s shadow which will cause thermal vibration and thermal buckling of spacecraft,and affecting the normal operation of the spacecraft.As for aerospace thermo-tubes as effective heat transmission devices,it is very necessary to analyze relevant thermal vibration under alternating temperature.First,this paper gives a brief analysis on the characteristics of heat pipe structure inorder to establish the dynamic model of aerospace thermo-tubes,kinetic equations of the heat pipe structure derived by the energy method,the corresponding dynamic partial differential equation derived by the application of Hamilton principle,and using the Galerkin method discrete partial differential equations into ordinary differential equations,after the numerical solution of oscillation equation are solved by Runge Kutta method,to analyze the vibration response curve when different temperature and liquid flow rate,obtained that vibration response amplitude increases,vibration period increases and frequency decreases to whole system with the increase of temperature and speed up velocity of the liquid.Second,this paper conducted that research on the critical value of buckling deformation of the thermo-tube structure.The influence of different temperature on the buckling deformation and the change of the natural frequency of the thermo-tube when the liquid flow rate reaches a certain value,the result manifests that with the increase of temperature will lead to the critical velocity value of the liquid decreases.Finally,this paper studied the vibration suppression of the aerospace thermo-tubes.Kinetic equations of thermo-tube and nonlinear energy sink are solved by numerical method,and applying Runge Kutta method to analyze the effect of vibration suppression by nonlinear energy sink to whole system under different temperature and liquid flow rate conditions.The result indicates that the robust performance of nonlinear energy sinks weakening with increase of temperature and the acceleration of velocity of the liquid.