Design,modeling, and control of morphing aircraft:A review

A morphing aircraft can adapt its configuration to suit different types of tasks, which is also an important requirement of Unmanned Aerial Vehicles(UAV). The successful development of an unmanned morphing aircraft involves three steps that determine its ability and intelligent: configuration design, dynamic modeling and flight control. This study conducts a comprehensive survey of morphing aircraft. First, the methods to design the configuration of a morphing aircraft are presented and analyzed...     

Cooperative fault detection and recovery in the GNSS positioning of mobile agent swarms based on relative distance measurements

Relative measurements are exploited to cooperatively detect and recover faults in the positioning of Mobile Agent(MA) Swarms(MASs). First, a network vertex fault detection method based on edge testing is proposed. For each edge, a property that has a functional relationship with the properties of its two vertices is measured and tested. Based on the edge testing results of the network, the maximum likelihood principle is used to identify the vertex fault sources. Second, an edge distance testing...     

Fault tolerant attitude control of under-actuated spacecraft: Theory and experiment

This paper investigates fault tolerant attitude control theory and experiment for under-actuated spacecraft with one reaction wheel completely broken and two others suffering actuator faults of partial loss of effectiveness or bias. A non-smooth robust adaptive fault tolerant control law is proposed under the zero-momentum and input saturation conditions. It shows that the available reaction wheels need to produce sufficient control torque for the fault tolerance. Such a new control method is implemented in a semi-physical simulation system of an air-bearing platform. Experimental results show the effectiveness of the proposed method in spacecraft practical engineering.     

基于 PDPC-EMV模型的装备研制方案优化设计

将全面质量管理的过程决策程序图法(PDPC)与决策分析技术的期望值法(EMV)有机结合,构建了PDPC-EMV理论模型,并将该模型引入到武器装备研制方案的设计环节中,用风险评估的思维解决全面质量管理的问题,为武器装备研制方案的设计工作开辟了一种先期质量控制思路。     

双基推进剂包覆层界面脱粘敲击检测系统设计

双基推进剂橡胶包覆层界面脱粘降低了推进剂工作性能，使其运行存在潜在的安全隐患。针对此问题，设计并开发了一套由信号处理组件、自动化控制组件和智能诊断组件构成的敲击检测系统，旨在通过自动化控制与智能敲击诊断技术相结合，更加全面的获取待测件的状态，提高检测的准确性和可靠性。实验结果表明，敲击检测系统可以识别橡胶包覆层脱粘缺陷，并且当敲击检测分辨率为3~10 mm时，脱粘缺陷检测准确率≥87.5%；BP神经网络隐含层神经元数设置6或7时，故障识别效果良好，K-means聚类算法对敲击检测数据故障确诊率≥90%。综上所述，敲击检测系统具有较高的检测分辨率和准确率，可以实现对双基推进剂包覆层粘接质量的客观评价。     

A novel combination belief rule base model for mechanical equipment fault diagnosis

Due to the excellent performance in complex systems modeling under small samples and uncertainty, Belief Rule Base(BRB) expert system has been widely applied in fault diagnosis. However, the fault diagnosis process for complex mechanical equipment normally needs multiple attributes, which can lead to the rule number explosion problem in BRB, and limit the efficiency and accuracy. To solve this problem, a novel Combination Belief Rule Base(C-BRB) model based on Directed Acyclic Graph(DAG) structu...