...耕作；团聚体；平均重量直径；土壤结构 [gap=2513]Key words: conservation tillage; soil aggregates; mean weight diameter; soil structure ...
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团聚体总量和平均重量直径降低。
以结构的总重量最小为优化目标，以导管的平均直径和壁厚作为设计变量，考虑强度、刚度和稳定等约束条件。
Total weight of the structure was selected to be optimal objectives. Average diameter and wall thickness of the structural element were taken as design variables.
以结构的总重量最小和结构的总应变能最大为优化目标，以导管的平均直径和壁厚作为设计变量，考虑强度、刚度和稳定等约束条件。
Total weight and seismic strain energy of the structure were selected to be optimal objectives. Average diameter and wall thickness of the structural element were taken as design variables.
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