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对于诸如大型高精度天线等精密结构的设计,有时要求结构(一般为桁架型)变形后的形状符合结构功能预先规定的特殊要求,此即按预定变形条件设计结构问题.大型高精度天线的保型设计就是这种问题.文献给出了这类问题的直接解法,但这类解法需要的截面设计变量过多.本文着重从理论上探讨了截面变量的归并问题,给出了所需的最少截面变量数目和方便可行的求解方法.这为按预定变形设计桁架结构直接解法的工程应用进一步提供了可能.
For the design of precision structures such as large precision antennas, it is sometimes required that the deformed shape of the structure (generally truss type) conforms to the special requirements specified by the structural function. This is to design the structural problem according to the predetermined deformation conditions. Type design is such a problem. The literature gives a direct solution to this type of problem, but this type of solution requires too many cross-section design variables. This paper focuses on theoretically discussing the merging of cross-section variables and gives the minimum required. The number of cross-section variables and a convenient and feasible solution method. This provides further possibilities for the engineering application of a direct solution to the design of the truss structure by a predetermined deformation.