Study On Thermal Strength Testing Of Rotational Body Structure Aircraft And Structure Optimization

The rotational body structure is a key component of high-speed aircraft,represented by the missile radome,which is often installed in the front of the aircraft head to prevent heat,bear and protect the internal electronic equipment,and has become a research hotspot at home and abroad.In the process of high-speed movement of the aircraft,the rotational body structure not only bears the huge aerodynamic thermal shock on the outer surface,which makes it have a large temperature gradient,resulting in the decline of the bearing capacity of the structure;on the other hand,when the mechanical stress produced by the action of transverse aerodynamic load and the thermal stress produced by the temperature gradient are superposed,the internal structure and function will be damaged greatly.Therefore,before the rotational body structure is delivered,the thermal and mechanical properties must be tested on the ground.This paper mainly takes the current integrated structure of heat protection and load bearing in the field of aviation and aerospace as the background and numerical simulation as the main method,combined with the scientific research project of thermal mechanical coupling testing loading technology of rotational body structure under the real flight condition,to carry out relevant research.This paper firstly analyzes the mechanical properties of rotational body structure aircraft under the thermal-mechanical coupling field through Ansys software,and analyzes the static loading of the core component "shaped rubber leather bag" in the test loading system.Then,based on the thermal strength test,the thermal strength test platform is designed.Finally,the structural optimization of the water cooling test model for debugging under the test platform calibration and test condition is carried out.Through this article,the following conclusions are obtained:(1)Under the thermal-mechanical coupling field,the maximum equivalent stress appears at the junction of radiant heating element region and non-radiant heating element region,and the maximum displacement appears at the tip of the whole structure.Temperature is the main factor which affects the stress and strain of the rotating body structure.Under the condition of ensuring the structural integrity,the maximum safe load of the rotating body structure is 1.0MPa.(2)The stress distribution of quasi-static loading is uniform by the shaped rubber leather bag,which can meet the test requirement.Under the condition of 0.4MPa internal pressure of the shaped rubber leather bag,the maximum stress of shaped rubber leather bag is 0.08 MPa and the maximum deformation is 0.08 mm.The application of shaped rubber leather bag loading provides a new method for equivalent simulation of transverse aerodynamic load in the thermal mechanical coupling test.(3)The thermal strength test platform of rotational body structure aircraft is designed and built,and the primary work before the thermal strength test is completed.The test platform is divided into three parts: test process equipment system,test loading system and test measurement and control system.They are respectively responsible for the installation of equipment,loading and data collection.After debugging,the thermal strength test platform meets the test requirements.(4)Under the condition of test platform calibration and test,the structure optimization of the water cooling test model for debugging is completed.The optimized cooling channel has the cooling capacity for the model,and the cooling capacity increases gradually with the flow rate increasing.