排球球缝随机气动力辨识建模

本文应用Ｈ（Ｈｏｕｓｅｈｏｌｄｅｒ）变换求解病态法方程之最小二乘法及三次样条函数最小二乘法，对不同球缝随机性气动力模型进行辨识，提高了参数估计精度。讨论了不同球缝和各种发政治协商会议方式气动力的建模方法，给出了数学模型，并进行了验证，所得结果与实践经验一致。表明气动力模型较符合实际，建模方法可行，模型简单实用，为研究运用球缝发飘球技术，提供了重要的模型依据。     

基于双循环的涡轮叶冠多学科设计优化

针对经典的多学科设计可行方法(MDF)的低效率问题,开展了利用可变复杂度建模方法改进MDF策略的研究.以涡轮叶冠为对象,综合考虑优化精度和优化效率,利用响应面方法近似高精度分析,简化计算难度,提高优化效率;合理引入可变复杂度建模方法,通过双循环结构优化策略周期性地调用高精度分析更新响应面方程来保证优化精度.基于双循环的涡轮叶冠多学科优化设计(MDO)表明,优化设计目标降低了1.4%,明显好于经典MDF策略(0.97%),整个优化策略共耗时2h39min,仅是经典MDF的优化时间的1/3.     

《航空学报》第35卷2014年主题索引

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基于实数编码量子进化算法和模态区间数学的航空发动机设计

本文将实数编码量子进化算法和模态区间数学相结合用于解决模态区间数学中的某些难以求解的问题。应用量子进化算法进行了模态区间数学方程组的求解和模态区间矩阵的求逆,将量子进化算法和模态区间数学用于航空发动机的设计,给出了基于模态区间数学的航空发动机总体性能设计方法。这种设计方法能够考虑设计的不确定性。并以某型涡喷发动机为例进行计算,设计结果更符合实际情况。     

Reachable set modeling and engagement analysis of exoatmospheric interceptor

A novel reachable set(RS) model is developed within a framework of exoatmospheric interceptor engagement analysis. The boost phase steering scheme and trajectory distortion mechanism of the interceptor are firstly explored. A mathematical model of the distorted RS is then formulated through a dimension–reduction analysis. By treating the outer boundary of the RS on sphere surface as a spherical convex hull, two relevant theorems are proposed and the RS envelope is depicted by the computational geometry theory. Based on RS model, the algorithms of intercept window analysis and launch parameters determination are proposed, and numerical simulations are carried out for interceptors with different energy or launch points. Results show that the proposed method can avoid intensive on-line computation and provide an accurate and effective approach for interceptor engagement analysis. The suggested RS model also serves as a ready reference to other related problems such as interceptor effectiveness evaluation and platform disposition.     

Dynamic modeling of a hose-drogue aerial refueling system and integral sliding mode backstepping control for the hose whipping phenomenon

Dynamic modeling of a hose-drogue aerial refueling system（HDARS） and an integral sliding mode backstepping controller design for the hose whipping phenomenon（HWP） during probe-drogue coupling are studied. Firstly, a dynamic model of the variable-length hose-drogue assembly is built for the sake of exploiting suppression methods for the whipping phenomenon.Based on the lumped parameter method, the hose is modeled by a series of variable-length links connected with frictionless joints. A set of iterative equations of the hose＇s three-dimensional motion is derived subject to hose reeling in/out, tanker motion, gravity, and aerodynamic loads accounting for the effects of steady wind, atmospheric turbulence, and tanker wake. Secondly,relying on a permanent magnet synchronous motor and high-precision position sensors, a new active control strategy for the HWP on the basis of the relative position between the tanker and the receiver is proposed. Considering the strict-feedback configuration of the permanent magnet synchronous motor, a rotor position control law based on the backstepping method is designed to insure global stability. An integral of the rotor position error and an exponential sliding mode reaching law of the current errors are applied to enhance control accuracy and robustness. Finally,the simulation results show the effectiveness of the proposed model and control laws.     

基于动态空域配置的航路调整问题研究

动态空域配置旨在通过对各类型空域功能块的设计、构架、配置和使用,实现空域的动态配置功能,使管制空域灵活地匹配空中交通实际变化的需求。在此概念下建立了以最小运营成本为目标的航路调整规划模型,在模型中考虑某些航路段可以动态地开关-闭合,引入动态航路的开放成本和使用成本,以最短开放时间、最大管制负荷和航路复杂度、安全性为约束条件,采取改进的遗传算法进行求解,验证了模型的正确性和可行性。计算结果表明:用模型制定的优化策略,充分利用了空域资源,减少了延误损失,总的航班运营成本减少了15%。     

第9届中国系统建模与仿真论坛征文通知

各有关单位： 为促进我国建模与仿真技术交流,加快推动我国仿真产业发展和科技成果转化;加速国防科技工业技术升级和现代化进程,更好地促进国防军工领域虚拟制造仿真技术的研究与应用。在论坛成功举办8届的基础上,中国计算机用户协会仿真应用分会、中国指挥与控制学会建模与仿真专业委员会和中国自动化学会系统仿真专业委员会联合举办主题为“创新驱动发展：大数据时代的建模与仿真”第9届中国系统建模与仿真技术高层论坛将于2014年11月在北京举行。     

基于流固耦合航行体入水冲击数值模拟研究

针对航行体入水冲击过程中的流固耦合问题,利用任意拉格朗日 欧拉算法建立三维入水冲击数值仿真模型。首先,建立球体入水冲击数值模型,获取了入水过程中的冲击载荷和表面压力数据,通过与试验对比,探究网格密度、接触刚度耦合系数以及时间步长对仿真准确性的影响。结果发现,冲击区域网格密度和接触刚度耦合系数决定流固耦合接触刚度;冲击域的网状密度对冲击系数结果和入水速度变化有明显影响;耦合节点之间的接触刚度系数会影响局部压力峰值。最后,建立锥形头部圆柱体入水仿真模型,提出分段刚体计算截面载荷方法,研究不同速度下结构入水冲击加速度、速度、位移和截面载荷变化规律,与试验结果对比证明仿真准确性。