Based upon a multisensor sequential processing filter, the target states in a3D Cartesian system are projected into the measurement space of each sensor to extend thejoint probabilistic data association (JPDA) algorit...Based upon a multisensor sequential processing filter, the target states in a3D Cartesian system are projected into the measurement space of each sensor to extend thejoint probabilistic data association (JPDA) algorithm into the multisensor tracking systemsconsisting of heterogeneous sensors for the data association.展开更多
With the increase of pipelines, corrosion leakage accidents happen frequently. Therefore, nondestructive testing technology is important for ensuring the safe operation of the pipelines and energy mining. In this pape...With the increase of pipelines, corrosion leakage accidents happen frequently. Therefore, nondestructive testing technology is important for ensuring the safe operation of the pipelines and energy mining. In this paper, the structure and principle of magnetic flux leakage （MFL） in-line inspection system is introduced first. Besides, a mathematic model of the system according to the ampere circuit rule, flux continuity theorem, and column coordinate transform is built, and the magnetic flux density in every point of space is calculated based on the theory of finite element analysis. Then we analyze and design the disposition of measurement section probes and sensors combining both three-axis MFL in-line inspection and multi-sensor fusion technology. Its advantage is that the three-axis changes of magnetic flux leakage field are measured by the multi-probes at the same time, so we can determine various defects accurately. Finally, the theory of finite element analysis is used to build a finite element simulation model, and the relationship between defects and MFL inspection signals is studied. Simulation and experiment results verify that the method not only enhances the detection ability to different types of defects but also improves the precision and reliability of the inspection system.展开更多
在传感器网络中,多个传感器对于同一目标的识别结果经常会发生冲突.本文采用基于D em pster-Shafer证据推理理论的数据融合方法来解决这一问题.然而,采用D-S证据组合公式计算融合结果,计算量过于巨大,对处理能力有限的感知结点来说负担...在传感器网络中,多个传感器对于同一目标的识别结果经常会发生冲突.本文采用基于D em pster-Shafer证据推理理论的数据融合方法来解决这一问题.然而,采用D-S证据组合公式计算融合结果,计算量过于巨大,对处理能力有限的感知结点来说负担过重,此外,计算所造成的延时也将严重影响系统的实时性和同步性.本文提出了一个基于矩阵分析的快速融合算法,该算法采用了D-S证据理论的思想,计算得到的融合结果与D-S证据组合公式计算得到的融合结果相同.本文用数学归纳法证明了这一结论.经过模拟实验验证,和直接采用D-S证据组合公式相比,该算法的计算量和所需的计算时间明显减少.展开更多
文摘Based upon a multisensor sequential processing filter, the target states in a3D Cartesian system are projected into the measurement space of each sensor to extend thejoint probabilistic data association (JPDA) algorithm into the multisensor tracking systemsconsisting of heterogeneous sensors for the data association.
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 61273164 and 61034005)the National High Technology Research and Development Program of China (Grant No. 2012AA040104)the Fundamental Research Funds for the Central Universities, China (Grant No. N100104102)
文摘With the increase of pipelines, corrosion leakage accidents happen frequently. Therefore, nondestructive testing technology is important for ensuring the safe operation of the pipelines and energy mining. In this paper, the structure and principle of magnetic flux leakage （MFL） in-line inspection system is introduced first. Besides, a mathematic model of the system according to the ampere circuit rule, flux continuity theorem, and column coordinate transform is built, and the magnetic flux density in every point of space is calculated based on the theory of finite element analysis. Then we analyze and design the disposition of measurement section probes and sensors combining both three-axis MFL in-line inspection and multi-sensor fusion technology. Its advantage is that the three-axis changes of magnetic flux leakage field are measured by the multi-probes at the same time, so we can determine various defects accurately. Finally, the theory of finite element analysis is used to build a finite element simulation model, and the relationship between defects and MFL inspection signals is studied. Simulation and experiment results verify that the method not only enhances the detection ability to different types of defects but also improves the precision and reliability of the inspection system.
文摘在传感器网络中,多个传感器对于同一目标的识别结果经常会发生冲突.本文采用基于D em pster-Shafer证据推理理论的数据融合方法来解决这一问题.然而,采用D-S证据组合公式计算融合结果,计算量过于巨大,对处理能力有限的感知结点来说负担过重,此外,计算所造成的延时也将严重影响系统的实时性和同步性.本文提出了一个基于矩阵分析的快速融合算法,该算法采用了D-S证据理论的思想,计算得到的融合结果与D-S证据组合公式计算得到的融合结果相同.本文用数学归纳法证明了这一结论.经过模拟实验验证,和直接采用D-S证据组合公式相比,该算法的计算量和所需的计算时间明显减少.
