横截面数据：成分数据只测量一次。这展示你的变量在一个时间点的快照（如：市场调查）。
Cross-Sectional: The sample of elements is measured only once. This shows you a snapshot of variables at a point in time (e. g. , market survey).
文中以拉索张力和杆件截面为设计变量，提出了预应力网架结构的优化模型，并给出了具体的优化设计步骤。
With optimization of pull cables and element sections as design variables, an optimization model and design approach for pre-stress space tress structures were obtained.
基于统一设计变量方法，实现了导管架海洋平台在动冰载荷作用下的截面和形状动力优化设计。
Based on the unified design variable method, the shape and sizing optimization design of jacket platform with dynamic ice-load is investigated.
以描述截面姿态的欧拉角为变量，建立受约束弹性杆的平衡方程。
The differential equations of equilibrium of the constrained rod are established taking Euler angles as variables to describe the attitude of the cross section.
本文以表征汽车车架动应力不均匀度为目标函数，以截面尺寸的大小为设计变量，对车架进行了优化设计。
This paper deals with optimal design of a vehicle frame. The unevenness of the dynamic stresses in vehicle frame is taken as objective function and the size of cross -section as design variable.
导出了用变形、内力作为混合状态变量表示的求解等截面梁的横向振动固有频率的普遍方程。
The deformations and the internal forces at a cross section of a beam are taken as state variables to formulate a general equation for computing the natural frequencies of non-uniform beams.
探讨了以预张力和截面尺寸为设计变量的预张力结构优化设计问题。
The optimum design for pretensioned structures considering both the pretension force variables and the size variables was discussed.
探讨了以预张力和截面尺寸为设计变量的预张力结构优化设计问题。
The optimum design for pretensioned structures considering both the pretension force variables and the size variables was discussed.
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