Rotor airfoil design is investigated in this paper. There are many difficulties for this highdimensional multi-objective problem when traditional multi-objective optimization methods are used. Therefore, a multi-layer...Rotor airfoil design is investigated in this paper. There are many difficulties for this highdimensional multi-objective problem when traditional multi-objective optimization methods are used. Therefore, a multi-layer hierarchical constraint method is proposed by coupling principal component analysis(PCA) dimensionality reduction and e-constraint method to translate the original high-dimensional problem into a bi-objective problem. This paper selects the main design objectives by conducting PCA to the preliminary solution of original problem with consideration of the priority of design objectives. According to the e-constraint method, the design model is established by treating the two top-ranking design goals as objective and others as variable constraints. A series of bi-objective Pareto curves will be obtained by changing the variable constraints, and the favorable solution can be obtained by analyzing Pareto curve spectrum. This method is applied to the rotor airfoil design and makes great improvement in aerodynamic performance. It is shown that the method is convenient and efficient, beyond which, it facilitates decision-making of the highdimensional multi-objective engineering problem.展开更多
针对指挥信息系统(command,control,communications,computers,intelligence,surveillance and reconnaissance,C4ISR)服务部署分散、作战平台计算/存储资源有限、演化实时性要求高的特点,基于分层结构设计了系统状态分布式监控与演化...针对指挥信息系统(command,control,communications,computers,intelligence,surveillance and reconnaissance,C4ISR)服务部署分散、作战平台计算/存储资源有限、演化实时性要求高的特点,基于分层结构设计了系统状态分布式监控与演化总体架构,并在该架构下提出了一种服务部署方案层级动态调整方法。通过定义信息流转长度与方案调整代价设计了服务部署调整方案的数学优化模型,针对部署方案中同时包含服务部署位置和信息流转路径的特点,将成对交换思想、最短路径规划与m-best策略相结合提出了一种贪心求解算法,以实现调整方案的快速生成。实验证明,该方法能够在保证系统信息流转效能的同时有效控制系统的演化范围,适用于执行任务过程中服务部署方案的敏捷调整。展开更多
针对气象雷达系统任务过程安全性问题,以基于系统论的事故模型及过程(systems-theoretic accident model and process)理论方法为基础,提出了一种案例激励安全性分析方法。在进近阶段机载气象雷达任务过程中,通过构建系统分层控制结构,...针对气象雷达系统任务过程安全性问题,以基于系统论的事故模型及过程(systems-theoretic accident model and process)理论方法为基础,提出了一种案例激励安全性分析方法。在进近阶段机载气象雷达任务过程中,通过构建系统分层控制结构,识别系统任务过程中存在的不安全控制行为,并辨识与不安全控制行为关联的潜在危险致因;构建安全飞行控制结构模型,以达美航空事故为例,提出安全约束建议控制事故衍变机制来优化模型,以提高系统任务过程安全。以上分析表明,该方法能更全面地识别系统深层危险致因,为机载气象雷达的安全性设计提供技术支持。展开更多
基金supported by the National Natural Science Foundation of China (No. 11402288 and 11372254)the National Basic Research Program of China (No. 2014CB744804)
文摘Rotor airfoil design is investigated in this paper. There are many difficulties for this highdimensional multi-objective problem when traditional multi-objective optimization methods are used. Therefore, a multi-layer hierarchical constraint method is proposed by coupling principal component analysis(PCA) dimensionality reduction and e-constraint method to translate the original high-dimensional problem into a bi-objective problem. This paper selects the main design objectives by conducting PCA to the preliminary solution of original problem with consideration of the priority of design objectives. According to the e-constraint method, the design model is established by treating the two top-ranking design goals as objective and others as variable constraints. A series of bi-objective Pareto curves will be obtained by changing the variable constraints, and the favorable solution can be obtained by analyzing Pareto curve spectrum. This method is applied to the rotor airfoil design and makes great improvement in aerodynamic performance. It is shown that the method is convenient and efficient, beyond which, it facilitates decision-making of the highdimensional multi-objective engineering problem.
文摘针对指挥信息系统(command,control,communications,computers,intelligence,surveillance and reconnaissance,C4ISR)服务部署分散、作战平台计算/存储资源有限、演化实时性要求高的特点,基于分层结构设计了系统状态分布式监控与演化总体架构,并在该架构下提出了一种服务部署方案层级动态调整方法。通过定义信息流转长度与方案调整代价设计了服务部署调整方案的数学优化模型,针对部署方案中同时包含服务部署位置和信息流转路径的特点,将成对交换思想、最短路径规划与m-best策略相结合提出了一种贪心求解算法,以实现调整方案的快速生成。实验证明,该方法能够在保证系统信息流转效能的同时有效控制系统的演化范围,适用于执行任务过程中服务部署方案的敏捷调整。
文摘针对气象雷达系统任务过程安全性问题,以基于系统论的事故模型及过程(systems-theoretic accident model and process)理论方法为基础,提出了一种案例激励安全性分析方法。在进近阶段机载气象雷达任务过程中,通过构建系统分层控制结构,识别系统任务过程中存在的不安全控制行为,并辨识与不安全控制行为关联的潜在危险致因;构建安全飞行控制结构模型,以达美航空事故为例,提出安全约束建议控制事故衍变机制来优化模型,以提高系统任务过程安全。以上分析表明,该方法能更全面地识别系统深层危险致因,为机载气象雷达的安全性设计提供技术支持。
