Research On Runway Bearing Capacity Based On Vibration Frequency Perception

During the take-off,landing and taxiing of an aircraft on an airport runway,it will inevitably have an impact on the runway structure.For a long time,the structural performance of the runway will be seriously affected.Therefore,during the normal operation of an airport runway,a series of necessary tests must be periodically performed on the overall performance of the runway to ensure the normal navigation safety of the airport runway.However,due to the airport’s high operating costs and complex coordination methods,the traditional drop hammer deflectometer and other test methods have been unable to meet the non-stop construction inspections required by the modern airport in the course of the road surface bearing capacity evaluation Claim.In this paper,a large number of finite element simulations and measured data are combined to innovatively place smart sensors below the road surface,so as to achieve real-time evaluation of runway carrying capacity without affecting the normal navigation of the airport runway.The main research contents of this article are as follows:1、Based on the analysis of the mechanics of the additional stress generated when the aircraft is taxiing on an uneven surface,combined with the differential vibration equation of the aircraft,MATLAB software is used to establish a random dynamic load model based on filtered white noise at different IRI values of the surface.2、Considering practical factors,a three-dimensional model of the pavement structure was established using ANSYS software.Based on the selection range of the aircraft’s ground speed,the rationality of the fixed-point impact and mobile impact models was verified.Based on the lift generated during the taxiing of the airplane and the random dynamic load due to the unevenness of the pavement,the excitation model of the dynamic load on the pavement under different conditions is analyzed.3、Based on the road surface unevenness excitation model,the dynamic load generated by the aircraft during taxiing is directly loaded into the three-dimensional structural model,and the ANSYS transient dynamic analysis principle is used to simulate the vibration response of the aircraft dynamic load to the road surface.4、Compare and analyze a large amount of finite element simulation data to determine the main factors that affect the runway fundamental frequency during taxiing.Establish the track fundamental frequency,the 6m fundamental frequency and the surface thickness,the surface modulus,and the base layer on the soil foundation.Multivariate fitting relation of thickness and soil modulus.A conversion relationship is established between the base-top equivalent rebound modulus and the fundamental frequency to achieve the purpose of inverting the runway carrying capacity based on the fundamental frequency.5、Based on the above research results,the use of Microsoft Visual Basic’s visual programming module language,the establishment of runway carrying capacity evaluation software,using a case data of a southwest airport in China for verification,verified the rationality of the software.