基于结构光的星箭对接环相对位姿测量方法

空间非合作目标位姿测量是空间在轨维护的前提。面向空间机械手对空间载体自动抓捕的应用需求，提出了基于结构光的空间非合作目标视觉测量方法。该方法以双套双线结构光测量装置作为测量传感器，以空间载体上普遍存在的星箭对接环作为抓捕目标。根据对接环的共同特点，选择直线特征和点特征相结合作为相对位姿的求解特征；基于直线特征求解圆环平面法向量，基于点特征求解圆环圆心坐标，进而得到机械手工具坐标系与对接环坐标系间的相对位姿关系；基于多重几何约束实现了不同光照条件下图像上目标直线的鲁棒识别。建立了演示验证实验系统，在大量演示实验的基础上，进行了实验结果分析。     

Efficient reliability analysis of dynamic k-out-of-n phase-AND mission systems

Motivated by real-world applications of satellites and wireless sensor networks, this paper models and evaluates a dynamic k-out-of-n phase-AND mission system (k/n-PAMS). The mission task conducted by a k/n-PAMS involves multiple consecutive phases; the mission is successful as long as the task is successful in any of the phases. Due to factors, such as scheduled maintenance, location changes in task execution during different phases, and resource sharing with other tasks, the total number of available components n for the considered mission task and the required number of working components k may change from phase to phase. In addition, due to varying load and working environments, component failure time distributions are also phase dependent. This paper proposes an analytical modeling approach based on multivalued decision diagrams (MDDs) for assessing reliability of the considered k/n-PAMS. The approach encompasses a new and fast MDD model generation algorithm that considers behaviors of all the mission phases simultaneously based on node labeling. As demonstrated through empirical studies on k/n-PAMSs with different sizes (different numbers of phases and different numbers of system components), the proposed algorithm is more efficient than the traditional phase-by-phase model generation method.     

A framework for improving the efficiency of operational testing through Bayesian adaptive design

When developing a product, it is important to consider product performance from a user perspective. This type of evaluation can be done through operational testing—assessing the ability of representative users to satisfactorily accomplish tasks with the product in operationally representative environments. This process can be expensive and time-consuming, but is critical to understanding whether the product can adequately do the job for which it was designed. We show how an existing design of experiments (DOEs) process for operational testing can be leveraged to construct a Bayesian adaptive design. This design, nested within the larger design created by the DOE process, allows interim analyses to stop testing early for success or futility. Representative simulations are presented to demonstrate how these interim analyses can be used in an operational test setting, and reductions in necessary test events are shown. The application of Bayesian-adaptive design methods will allow future operational testing to be conducted in less time and at less expense, on average, without compromising the ability of the existing process to verify the product meets the user's needs.     

基于非合作博弈的居民负荷分层调度模型

为促进居民用户柔性负荷资源有效参与需求响应,可以利用负荷聚合商来聚合用户负荷资源参与电网调度。通过将居民用户的柔性负荷进行分类,建立电网公司、负荷聚合商和居民用户的分层调度模型。在日前投标环节,构建了以聚合商利润最大化为目标的日前投标博弈模型,利用非合作博弈思想对聚合商在日前投标市场进行分析,并给出了博弈纳什均衡解的存在性证明;在实时调度环节,聚合商以分类柔性负荷各自用电物理特性作为约束条件,以实时调度和日前投标量之间的偏差最小作为目标函数对用户分类柔性负荷进行实时调度,使得在不影响用户舒适度情况下提高聚合商的利润。算例仿真分析结果表明,所建立的分层调度模型可有效实现居民负荷的需求响应,并使得电网公司、负荷聚合商和用户三方均受益。     

面向任务携行航材品种确定和消耗预测的特征选择分析

为进一步提高对携行航材品种确定和消耗数量预测的准确性,针对非线性多影响因素的品种分类和消耗预测模型中的特征选择问题进行研究.对影响携行航材需求的因素进行分析,建立三级特征体系,并针对品种确定和消耗预测提取相应的特征集合;采用XGboost、灰色关联度分析(grey relation analysis,GRA)、决策试验和评价实验法(decision making trial and evaluation laboratory,DEMATEL)等方法对各影响特征进行重要性排序和相关性分析;综合运用定性和定量分析方法筛选特征;分别建立可用于品种确定和数量预测的精简版特征集合.该研究可为后续提高携行航材品种确定和预测的准确率和运算效率提供参考.     

Coverage control algorithm for wireless sensor networks based on non-cooperative game

For the redundancy coverage of nodes leads to the phenomenon of low energy efficiency,Non-cooperative game theory was used to solve it.A revenue function was proposed,which considering the coverage of nodes and the residual energy.The lifetime of the node and network path gain were applied to revenue function.The network topology was built by nodes with the appropriate work strategy.Control algorithm coverage in wireless sensor network was proposed based on Non-cooperative game theory.A Nash equilibrium between the coverage rate and the residual energy was proved,and the return function converged to the Pareto optimal.Experiments show that the algorithm can provide reasonable coverage of network nodes and ensure energy efficiency.     

某大机动无人机基于飞行任务的敏捷性评估飞行科目设计与仿真

由于现代空战的特点，根据时间量级分类的单维度的敏捷性评估已经不能满足空战的需求。为了优化控制系统的设计，最大限度地发挥飞机的飞行性能，需要对大机动无人机进行基于飞行任务的敏捷性评估。针对大机动无人机敏捷性评估的特点，从20个标准评估机动任务集中选取了3种与某无人机实际使用相关性较强的飞行任务作为其评估机动，展开了无人机基于飞行任务的敏捷性评估和仿真验证。对选取的3种飞行任务进行了详细的敏捷性评估方法描述，在通用的无人机敏捷性评估仿真环境中对加入非线性飞行控制律的某大机动无人机进行了基于3种飞行任务的敏捷性评估仿真验证，根据评估结果对控制律进行调参，为控制律设计提供指南和优化依据。     

Optimal completed work dependent loading of components in cold standby systems

This paper considers the modelling and optimization of 1-out-of-N: G cold standby (CS) systems with non-repairable components functioning at different levels of productivity or load. The productivity heterogeneity leads to difference in component failure behaviour as well as in operational and replacement costs. Thus, the choice of load or productivity of components can greatly affect the system reliability and mission cost. To make the optimal choice of component loading, we first suggest a method for analysing the reliability and expected mission cost of 1-out-of-N: G non-repairable CS systems with heterogeneous components. The optimal dynamic load distribution problem is then formulated and solved, in which the component loading is chosen depending on the amount of work completed prior to the component activation. The optimal loading is aimed at minimizing the expected mission cost, while meeting a certain system reliability constraint. Examples are given to demonstrate the proposed methodology and the improvement in the optimal design solution through introducing the component productivity’s dependence on the completed work.     

博弈结构、生产方式与双方道德风险组织激励

基于委托代理理论给出了双方道德风险组织激励问题的基本分析框架,建立合作与非合作博弈结构下双方道德风险组织激励问题的规划模型。以分析框架与规划模型为基础,引入线性生产与协作生产两种具体的生产方式,全面对比分析了不同博弈结构、不同生产方式下双方道德风险组织激励的均衡努力、最优契约和效用水平,揭示了不同博弈结构、不同生产方式下双方道德风险组织激励问题的特点与规律。     

IDENTIFYING SYSTEM FUNCTIONS

This article provides certain fairly rigorous, although still heuristic, methods for identifying the functional components of systems in such a way as to facilitate making relationships between the components and the overall system. Based on the definitions of function commonly used, making such a relationship is not always as easy as it could be made. Specific matters discussed herein include the following: functions and objectives-oriented thinking; logical versus physical thinking; functional outputs versus functional objectives; functional objectives versus system mission; directness of relationship to an objective; relationships between multiple functional objectives; distinguishing specific objectives within more general ones; the need to develop a consistent set of terms; etc.