Research On Thermal-Mechanical Coupling Of The High-Speed Friction Process Of Aircraft Tire

Aircraft tires are key components to ensure the take-off and landing of aircraft,and play a vital role in aircraft controllability,comfort and safety.However,aircraft tires are subjected to severe service conditions such as high-speed and high-pressure during the taxiing process,which rapidly heats up due to hysteresis loss and friction loss,which adversely affects the thermodynamic properties of tire rubber,cord and other components.Therefore,it is particularly necessary to carry out systematic research on the thermodynamic behavior of aircraft tires during taxiing.This paper combines experiments,theory and finite element simulation analysis methods to conduct an in-depth study on the thermodynamic behavior of aircraft tires in the process of friction and rolling under severe service conditions.A high-speed friction test platform for aircraft tire rubber under severe service conditions has been developed,and the thermodynamic properties of rubber materials have been studied.On the one hand,a new high-speed friction test platform was developed to simulate complex working conditions such as sideways,camber,and rolling,and lay the foundation for the study of hysteresis loss mechanism;On the other hand,in order to realize the high-speed sliding friction test of rubber materials,a pin-on-disc high-speed friction test prototype was built;In addition,the thermodynamic properties of rubber materials have been studied,and related characterization models have been established to provide a basis for subsequent thermal-mechanical coupling simulation analysis.The study on the thermodynamic behavior of rolling of rubber wheels and sliding of rubber rings was carried out,and the mechanism of hysteresis loss and friction loss on rubber heat generation was revealed.The rubber wheel-grinding wheel specimen was used as the simplified tire-road surface,and the rubber ringsand ball was used as the simplified tire tread-road surface particles,and the heating behavior test study of the rubber wheel under the high-speed rolling condition and the rubber ring high-speed sliding condition was carried out;The core problems of thermo-mechanical coupling calculation theory such as hysteresis loss heat generation,friction loss heat generation,convection heat transfer,heat flow distribution,etc.are systematically analyzed.Based on the two-way coupling modular solution method,a thermal-mechanical coupling simulation model of rubber wheel rolling and rubber ring sliding is established.The comparison of simulation and test results verifies the effectiveness of the thermo-mechanical coupling solution method dominated by hysteresis loss heat generation and friction loss heat generation.The heating characteristics of rubber wheels under pure rolling and pure sliding conditions are analyzed in depth.The thermal-mechanical coupling simulation analysis finite element model of aircraft tires under typical coasting and braking conditions is established,and the thermodynamic characteristics of aircraft tires are predicted.Analyzed the structural composition and material distribution characteristics of aircraft tires;systematically tested the mechanical properties of aircraft tire rubber,cords,steel wires and other components,and established a characterization model;for the coasting and braking conditions,based on the established modularity The thermalmechanical coupling simulation analysis method establishes an aircraft tire-road thermal-mechanical coupling simulation analysis model that takes into account both the heat generated by hysteresis loss and the heat generated by friction loss,and reveals the characteristics of the thermodynamic behavior of the aircraft tire under the typical braking condition.