航迹去纠缠处理是基于自动识别系统(Automatic Identification System,AIS)数据进行船舶运动行为深入分析的基础。传统航迹去纠缠处理方法存在虚警率和漏警率均较高的问题,这会造成重要船舶运动特征信息缺失以及纠缠去除不彻底等,进而...航迹去纠缠处理是基于自动识别系统(Automatic Identification System,AIS)数据进行船舶运动行为深入分析的基础。传统航迹去纠缠处理方法存在虚警率和漏警率均较高的问题,这会造成重要船舶运动特征信息缺失以及纠缠去除不彻底等,进而影响数据的可用性。基于此,通过分析船舶AIS原始定位数据特点以及船舶运动属性特征,提出基于运动属性约束的船舶AIS航迹去纠缠方法(A Method for Removing Entanglement of AIS Trajectory Based on the Constraints of Motion Attributes,CoMA),以瞬时航行速度和时间间隔约束船舶空间位置合理范围,以瞬时航向约束船舶转向的合理区间,双重约束下对航迹纠缠点进行去除。通过实例验证与对比可得,相较于传统航迹去纠缠方法,该方法能够在纠缠点彻底、精准、高效去除的前提下,最大程度地保留船舶运动行为特征,可为后续船舶航迹深入分析提供准确的数据输入。展开更多
提出一种基于Copula函数的多功能机械系统竞争失效分析方法。针对因“载荷过大”所致突发破坏失效和因“结构并未破坏但功能无法完成”所致退化型功能失效共同影响的多功能机械系统,基于冲击模型和漂移布朗运动(Brownian motion with dr...提出一种基于Copula函数的多功能机械系统竞争失效分析方法。针对因“载荷过大”所致突发破坏失效和因“结构并未破坏但功能无法完成”所致退化型功能失效共同影响的多功能机械系统,基于冲击模型和漂移布朗运动(Brownian motion with drift)研究突发失效和功能失效的建模方法;利用Copula函数定量化多失效模式之间的相关特性并构造联合分布函数,建立竞争失效模型,形成机械系统可靠度及其演化规律的分析计算方法;利用文章所提模型和方法,对某型飞机多失效模式舱门锁机构进行分析,研究发现基于所提方法的计算结果有着更高的精确性。展开更多
In order to analyze the sealing performance of a new designed premium threaded connection,this paper studies the sealing reliability and sensitivity of the premium threaded connection at its most dangerous load condit...In order to analyze the sealing performance of a new designed premium threaded connection,this paper studies the sealing reliability and sensitivity of the premium threaded connection at its most dangerous load condition based on Kriging model.The load condition of premium threaded connection in deep well is so complex that the most dangerous load point of premium threaded connection under the typical series loads is studied by finite element analysis(FEA) method firstly.Since the FEA of the premium threaded connection is too time-consuming,Kriging model which is accurate and efficient for multidimensional and highly nonlinear problems is built to calculate the sealing reliability of the premium threaded connection at the most dangerous load point.Finally,the sealing sensitivity analysis of the premium threaded connection is performed by the method of variance-based global sensitivity analysis.The work in this paper could contribute for the analysis and further improvement of the premium threaded connection.展开更多
文摘航迹去纠缠处理是基于自动识别系统(Automatic Identification System,AIS)数据进行船舶运动行为深入分析的基础。传统航迹去纠缠处理方法存在虚警率和漏警率均较高的问题,这会造成重要船舶运动特征信息缺失以及纠缠去除不彻底等,进而影响数据的可用性。基于此,通过分析船舶AIS原始定位数据特点以及船舶运动属性特征,提出基于运动属性约束的船舶AIS航迹去纠缠方法(A Method for Removing Entanglement of AIS Trajectory Based on the Constraints of Motion Attributes,CoMA),以瞬时航行速度和时间间隔约束船舶空间位置合理范围,以瞬时航向约束船舶转向的合理区间,双重约束下对航迹纠缠点进行去除。通过实例验证与对比可得,相较于传统航迹去纠缠方法,该方法能够在纠缠点彻底、精准、高效去除的前提下,最大程度地保留船舶运动行为特征,可为后续船舶航迹深入分析提供准确的数据输入。
文摘提出一种基于Copula函数的多功能机械系统竞争失效分析方法。针对因“载荷过大”所致突发破坏失效和因“结构并未破坏但功能无法完成”所致退化型功能失效共同影响的多功能机械系统,基于冲击模型和漂移布朗运动(Brownian motion with drift)研究突发失效和功能失效的建模方法;利用Copula函数定量化多失效模式之间的相关特性并构造联合分布函数,建立竞争失效模型,形成机械系统可靠度及其演化规律的分析计算方法;利用文章所提模型和方法,对某型飞机多失效模式舱门锁机构进行分析,研究发现基于所提方法的计算结果有着更高的精确性。
文摘In order to analyze the sealing performance of a new designed premium threaded connection,this paper studies the sealing reliability and sensitivity of the premium threaded connection at its most dangerous load condition based on Kriging model.The load condition of premium threaded connection in deep well is so complex that the most dangerous load point of premium threaded connection under the typical series loads is studied by finite element analysis(FEA) method firstly.Since the FEA of the premium threaded connection is too time-consuming,Kriging model which is accurate and efficient for multidimensional and highly nonlinear problems is built to calculate the sealing reliability of the premium threaded connection at the most dangerous load point.Finally,the sealing sensitivity analysis of the premium threaded connection is performed by the method of variance-based global sensitivity analysis.The work in this paper could contribute for the analysis and further improvement of the premium threaded connection.
