| 1. | Nominal cross sectional area
标称横截面面积 |
| 2. | Cross sectional area
横截面面积 |
| 3. | The new flap keeps essentially the same profile , but with a reduced cross sectional area at its extremities
新的襟翼维持原本的外型，但是在尾端缩小断面的交错。 |
| 4. | The new flap keeps essentially the same profile , but with a reduced cross sectional area at its extremities
新副翼的形状在总体上保持不变，不过在其末端的横截面积却变小了。 |
| 5. | In line with other teams , its top features a vertical fin which dramatically reduces its cross sectional area
与其他车队相比，它最显著的特徵在于垂直的鳍，这片鳍戏剧性的减少了交错的区域。 |
| 6. | Insulated cables and flexible cords for installations - heating cables , without mechanical protection and reduced cross sectional area
装置用绝缘电缆和软线.无机械保护和减径横截面积的加热电缆 |
| 7. | This paper established optimization mathematical models with the structural reliability constraints based on the structural reliability analysis . in this paper , truss and beam structures are studied as the research objects and the structural elements cross sectional areas as the design variables
在结构可靠性分析的基础上，构建了以杆、梁截面积为设计变量，使结构重量极小化为目标函数，同时具有应力和位移可靠性约束的优化设计数学模型。 |
| 8. | The optimal model of truss structure is established , in which the cross sectional areas of bar are taken as design variables , the structure weight is taken as objective function . in the process , the reliability of structural displacement and bar stress and the fundamental frequency are taken as constraint functions . from the engineering practice , all the reliability constraints , which are implicit generally with the design variables , are equalized and transferred to the conventional explicit constraints
本文将主要考虑桁架结构的优化问题，首先建立数学模型，即以桁架的横截面积为设计变量、以重量最小为优化目标，位移、应力等可靠性及基频为约束条件；最后，从工程实际出发，对结构系统的可靠性隐形约束进行等价显化处理，使之转化为常规的横截面积优化问题。 |
| 9. | Therefore , the original optimization model is transformed into the problem of cross sectional area optimization . this paper had great research on the development of optimization algorithm by analyzing typical optimal search method , such as greedy algorithm , simulated annealing algorithm , neural network and genetic algorithm ( ga ) . according to the characteristics of truss structure , we choose genetic algorithm as the solution way
本文在研究优化算法发展过程的基础上，分析了典型的优化搜索方法：确定性算法如贪婪算法，随机搜索算法如模拟退火算法，人工智能算法如神经网络及遗传算法，根据桁架结构优化的特点，最终选择以遗传算法作为桁架结构优化设计的主要算法。 |
