Bearing Capacity Analysis Of Inflatable Structures With Enhancing Tethers

As the component of large space deployable structures, inflatable structure iswidely used in aviation, astrogation and huge buildings. In order to improve thebearing capacity of Inflatable structures, a certain number of enhancing cablesshould be placed in inflatable structures.The analysis model of the connecting region of membrane and cable has beenestablished. Considering the impact of geometric nonlinearity, the deformation,strain field and stress field of connecting region can be derived. The influence ofYoung modulus, Poisson’s ratio, gas pressure, concentrated force, the diameter ofmembrane on the shape of serif, has been discussed, and the influence regulation canbe derived.Experimental system to analyse the connecting region of membrane and cablehas been conducted. The deformation and strain field of connecting region indifferent conditions (including gas pressure, concentrated force, scale effect,category of membrane) can be derived by the non-contact digital measuring system.The influence of different conditions is focused. After comparing experimentalresults and numerical results, the FEM has been proved right and the origin of errorhas been analysed.Defined tensile stiffness of inflatable torus by one end clamped and the otherone forced by a concentrated force. A type of furcate enhancing cables is designed toimprove the tensile stiffness. The distribution of stress and cable tension is derivedafter calculation. The influence of the length of main cable, original angle, mainangle, out-furcate angle, in-furcate angle, to the tensile stiffness, are discussed, andthe influence regulation is derived. By optimization, these parameters with whichthe tensile stiffness gets its maximum has been obtained.The model of cable-enhanced airship hull(CEAH) has been established. Thedeformation property has been obtained through numerical analysis. According tovibration analysis, inherent frequency and model shape of CEAH are derived.