Coupling Vibration Analysis Of Airplane And Taxiway Bridge Based On Multi-degrees Of Freedom

With the development of our civil aviation industry,more and more airports need to build taxiway bridges.With the progress of urbanization in China,the role of taxiway bridges in the airport transportation system has become increasingly prominent.It solves the conflict problem of airport traffic,and taxiway bridge will also become a core part of airport construction.The service life of the taxiway bridge in the last century has reached more than 20 years.As a result,there must be some aging.Therefore,whether the old taxiway bridge can meet the safe taxiing of large aircraft and the construction of a new taxiway bridge have become the focus of current airport construction research.The research on the response of vehicle-bridge coupling vibration has begun in the last century,and a lot of research results have been obtained on railway and highway bridges.However,the research on the coupled vibration of the aircraft-bridge is still in its infancy at home and abroad,Because taxiway bridges are very different from highway and railway bridges,the research results of vehicle-bridge coupled vibration are difficult to directly apply to airport taxiway bridges.Therefore,it is particularly important to understand the principle of the aircraft-bridge coupling vibration,and to provide new methods and theoretical support for the design and rapid diagnosis of taxiway bridges.To this end,this paper combines the principles of structural dynamics and uses the finite element method to study the coupling vibration problem of the bridge.The specific contents are as follows:(1)The plane vibration equation was established based on the D'Alembert principle,and the taxiway bridge vibration equation was established based on the torque balance theory.According to the displacement coordination conditions,the simultaneous equations were used to obtain the aircraft-bridge vibration equation.(2)The analysis method of equivalent load is proposed,and the large-scale finite element software ANSYS is used to study the influence of the taxiway bridge parameters(section form,span,width,etc.)on the taxiway bridge fundamental frequency and the airplane-bridge coupling vibration response.(3)Taking simple-supported beams and three-span continuous beams as the research objects,the vibration response of the taxiway bridge was analyzed by the forced vibration of the aircraft,and the response laws of the bridge fundamental frequency,aircraft moving speed and aircraft frequency to the bridge-coupled vibration were obtained.(4)Based on the reliability analysis theory,the influence rule of the taxiway bridge design life on the aircraft frequency and the taxiway bridge fundamental frequency was analyzed.The remaining life analysis of the in-service taxiway bridge combined with the reliability theory was compared with the literature data to verify accuracy.