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梁截面函数的处理是杆、膜、梁组合结构优化设计的一个难点。本文利用Ｄｕｆｆｉｎ 公式解决了这一困难，并编制了可用于ＴＱ－１６机的梁截面函数数据前加工程序。对 某铁路车辆底架的优化结果表明：ＤＤＤＵ－２程序系统可有效地用于实际工程结构优 化。
The processing of the beam section function is a difficult point in the optimization design of the composite structure of rods, membranes and beams. This paper uses Duffin’s formula to solve this difficulty, and prepares a data processing program for beam section function that can be used in TQ-16 machine. The optimization results for a railcar chassis indicate that the DDDU-2 program system can be effectively used to optimize the actual project structure.