Mechanical Characteristics Analysis And Life Evaluation Of Wire Rope In Aviation Support System

The arresting cable is a crucial part in the aviation support system.Special structure and harsh working environment lead to serious shortage of performance,short and scattered life of the arresting cable.The performance of the arresting cable has become a constraint of aircraft carrier.At present,relevant research on the mechanical performance and life evaluation of the arresting cable is relatively scarce,and the harsh test conditions and high costs make it difficult to fully carry out tests.Theoretical research usually focuses on the systematic modeling and analysis of the arresting device.There are very few theoretical studies or simulation,and there is no research on the whole process analysis from the geometric modeling to fatigue life evaluation of the arresting cable.This paper proposes a complete analysis method for the whole process of mechanical performance analysis and fatigue life evaluation for the arresting cable of the aviation support system.The geometric modeling,the loading rule and the transient mechanical performance of the arresting cable are deeply explored.The influence of broken wire on the mechanical properties of the arresting cable is quantitatively described,and the fatigue life of the wire in the most dangerous part of the arresting cable is solved based on the certainty and uncertainty fatigue life evaluation methods respectively.The main work is as follows:Firstly,an accurate parametric geometric model and mechanical model of the arresting cable are established.By controlling the geometric parameters such as helix angle and lay length,the parameter equations of the centroid lines of wires with different diameters are solved,and the three-dimensional geometric modeling of the arresting cable with different configurations is realized.The material properties are obtained by carrying out the tensile test of wire specimens.Based on the classical mechanics theory,the mechanical model of the arresting cable is established and its mechanical response is solved,which lies a solid theoretical foundation for the subsequent simulation analysis.Secondly,the loading rule of the arresting cable during the landing process of the carrierbased aircraft is analyzed based on the dynamic simulation.The formation,propagation principle and kinematic parameters of the bending wave are explored.The dynamic model of hook-cable is established and the tension spectrums of the arresting cable under different arresting conditions are obtained by dynamic simulation.The influence of eccentricity and yaw on the loading rule as well as the jerk of the arresting cable are evaluated,which provide key data support for the finite element analysis and life evaluation of the arresting cable.Subsequently,the transient mechanical performance of the inner wires of the arresting cable are analyzed based on the finite element simulation.A high-precision finite element model of the arresting cable is established on the basis of precise geometric modeling.In order to solve the problem of convergence and improve the calculation accuracy,an in-depth study is conducted on the model mesh and contact setting between wires.A finite element preprocessing plug-in is developed to facilitate the complicated pre-processing operations.The stress and deformation rules of each layer of wires under eight typical working conditions are quantitatively described.The influence of the number and position of broken wires on the mechanical performance of the arresting cable are quantitatively analyzed,which provide a basis for the design,use and maintenance of the arresting cable.Finally,the fatigue life of the arresting cable is predicted.The fatigue life of the most dangerous wire of the arresting cable under certain working condition is solved by the local stress-strain method.A generalized discrete gray model for the fatigue life prediction of the arresting cable is established based on the gray theory.The proposed model has high accuracy and feasibility,which provides a new idea for the study of fatigue life research on the arresting cable.