Analysis Of Force-thermal Coupling And Dynamic Strength Rsearch Of Composite Plate Structure

During the flight of a high-speed aircraft in the atmosphere,friction with the air will generate a lot of heat,making the surface temperature of the aircraft reach a very high level.At the same time,it will also have an impact on the dynamic characteri stics of the aircraft under the action of aerodynamic loads.This poses a great threat to the aircraft.Therefore,it is very important to accurately simulate the thermal environment in the air on the ground,conduct a mechanical-thermal coupling analysis on key components,and perform dynamic response analysis and vibration fatigue analysis on the aircraft’s insulation structure.Significance.In this paper,a finite element model for the radiation heat transfer calculation of the "heater + test piece" combined structure is established,and PID control is embedded in the finite element simulation to realize the simulation of the entire temperature change process in the structural thermal test,including multiple temperature zones with different temperatures.The precise control of the control curve makes the simulation results closer to the real working conditions,and then the high-temperature dynamic response analysis is further carried out,and the comparison with the experiment is carried out to verify t he reliability of the method.Using reinforcement learning algorithm to optimize the dual temperature zone control PID parameters,and based on this method developed the ABAQUS plug-in to simplify the simulation process.Vibration fatigue test was carried out for the integral TPS-based component,the fatigue failure form of the test piece was observed,the process of the crack initiation to the propagation of the test piece was recorded,the relevant test data was collected and analyzed,and the fatigue of the test piece under random vibration conditions was obtained life.The finite element modeling,modal analysis,random vibration response analysis and random vibration fatigue analysis of the TPS base element are carried out.The simulation results of the base element’s natural frequency and corresponding mode shape,random vibration acceleration response and vibration fatigue life are obtained.Summarize the process of finite element modeling,dynamic response analysis,random vibration fatigue analysis and dangerous point prediction of the TPS plate structure.