Optimal design of cable skeleton membrane structure parameters under combined load
To satisfy the mechanical properties and minimize consumables of the cable skeleton membrane structure,a new cable skeleton membrane structure model is first built according to the relevant design criteria.Then ANSYS is employed to analyze the axial force and deformation of the membrane structure members under different load combination conditions,and the most unfavorable load conditions to the membrane structure are compared.Next,the orthogonal test method is adopted to analyze the finite element results under the most unfavorable load conditions,and the influence degree of the cross section size of the rod and the spatial geometric arrangement of the rod on the stability and deformation of the pressure rod is obtained.Finally,with the string deflection,the slenderness ratio of the support rod to the oblique rod and the critical pressure for the stability of the pressure rod as the constraint conditions,and the minimum mass of the membrane structure as the optimization objective,the response surface method is adopted.The skeleton membrane structure is optimized and the optimal design scheme is obtained:The Angle (A) between the chord and the rod is 42°,the span to height ratio (B) 12,the outer diameter (C) of the diagonal rod 28 mm,the diameter to thickness ratio (D) of the diagonal rod 10,the outer diameter (E) of the support rod 51 mm,the diameter to tshickness ratio(F) of the support rod 15,the width (G) of the chord 32 mm,and the height (H) of the chord 95mm.Compared with the initial design,the optimized scheme reduces the mass by 6.82％ and the chord deflection by 21.22％.Our method may provide some insights for the design of similar structures with some superior key structural parameters such as the Angle between the chord and the belly and the ratio of span to height.Moreover,the key technical problems in the design of such membrane structures are thoroughly addressed.
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