准方案 meaning in Chinese
quasi-project
Examples
- Compared with a delta wing aircraft , the double - delta wing configuration has better aerodynamic performance at high angles of attack . an operational analysis was introduced as a method for evaluating training effectiveness of trainer aircraft . approaches to the engineering estimation of aerodynamic characteristics for aircraft with a double - delta wing configuration were studied , and the procedures for determining aircraft performance indices formulated . taking training effectiveness as the objective function and geometric parameters of the wing platform as design variables , through a numerical multivariate optimization arithmetic , the conceptual design optimization for a certain fighter trainer aircraft with double - delta wing configuration was carried out under the constraints of tactical and technical requirements and interrelated geometry . agreement of a calculation example with engineering practice indicates that the optimal design has higher training effectiveness than the baseline design , and in addition , improves the structural force - bearing conditions
双三角翼气动布局比三角翼飞机具有更好的大攻角空气动力特性.引入了评估教练机训练效能的作战分析法,研究了双三角机翼布局飞机空气动力特性的工程计算途径以及飞机性能指标的确定方法.以训练效能作为目标函数并选取机翼平面形状的几何参数为设计变量,采用多变量数值寻优方法,在战术技术指标及相关几何约束条件下,对某高级教练机的双三角机翼气动布局方案进行了优化选择.算例表明最优方案不仅比原准方案具有更高的训练效能,还改善了结构的受力情况,与工程实践吻合