Theoretical Study Of Cable Force Identification Considering Structural Influences

In recent decades,the Space Structure has developed rapidly at home and abroad.As an indispensable high efficient tensile member,steel cables are used in various space systems,especially tensile structures.The existence of steel cables not only helps to improve the structural stiffness and the internal force distribution of the system,but also decreases the internal force peak value and improves the bearing capacity of the structure.The influence of the whole structure on the cable force identification can not be ignored when the boundary conditions are undefined for steel cables in the structure.Based on the existing cable force identification theory and FEA(Finite Element Analysis)through a kind of software named ANSYS,the thesis discusses the cable force identification considering the influence of the whole structure.The main work is as follows:First,the thesis derived the equation of free vibration about the single cable,summarized the empirical formula of cable force identification and established a numerical model of single cable,based on which the thesis calculating and analyzing the relative error.Next,the thesis derived the differential equation of free vibration about the multi-span cables and established a numerical model of multi-span cables,based on which the thesis calculating and analyzing the relative error.Then,the thesis carried out global modal analysis of the BSS(String Beam Structure)taking advantage of the theoretical results and groped for a method of picking up the local mode of the local cable from the BSS(String Beam Structure).Finally,the thesis calculated the cable force identification results based on the local model of local cables from the BSS(String Beam Structure),calculated and analyzed the relative error through comparing the cable force identification results based on the local model of local cables with the cable force identification results based on numerical model of single cable.