During the desing of channel transect,the paper brings forward golden section method,which is 0.618 methods.In order to reduce the calculation volume of the natural depth of water h 0 and bottomˉwidth b which apply ...During the desing of channel transect,the paper brings forward golden section method,which is 0.618 methods.In order to reduce the calculation volume of the natural depth of water h 0 and bottomˉwidth b which apply trial calculation method and graphic method,and improve the calculate precision,the mathematical model has been built up,the writer combines example to explain the train of thought,the result shows that the calculation precision is high,the correctness is tested and verified by the result which is calculated by hand.It can be referred to the hydroelectric works.展开更多
It is well known that the incorrect results will be given using either the electric or magnetic field integral equation to calculate the radar cross section (RCS) of a closed body at the interior resonance. In this pa...It is well known that the incorrect results will be given using either the electric or magnetic field integral equation to calculate the radar cross section (RCS) of a closed body at the interior resonance. In this paper, an effective iterative technique is used to correct the calculated surface current density from the electric field integral equation. The radar cross section is computed for an infinite conducting circular cylinder at the interior resonance, and the obtained results are in good agreement with the analytical results. The backscattering cross section of an infinite triangular cylinder in the vicinity of a resonant frequency is also calculated. It is shown that the presence method is efficient and accurate.展开更多
Based on a Pade approximation, a wide-angle parabolic equation method is introduced for computing the multiobject radar cross section （RCS） for the first time. The method is a paraxial version of the scalar wave equ...Based on a Pade approximation, a wide-angle parabolic equation method is introduced for computing the multiobject radar cross section （RCS） for the first time. The method is a paraxial version of the scalar wave equation, which solves the field by marching them along the paraxial direction. Numerical results show that a single wide-angle parabofic equation run can compute multi-object RCS efficiently for angles up to 45 ° . The method provides anew and efficient numerical method for computation electromagnetics.展开更多
针对未来战争对无人系统的需求不断增加,提出一种适用于狭小空间和复杂环境的新型无人系统——两栖无人作战车系统,同时具备地面行驶、墙面爬行、空中飞行和协同作战能力。采用基于Agent的建模与仿真(agent-based modeling and simulati...针对未来战争对无人系统的需求不断增加,提出一种适用于狭小空间和复杂环境的新型无人系统——两栖无人作战车系统,同时具备地面行驶、墙面爬行、空中飞行和协同作战能力。采用基于Agent的建模与仿真(agent-based modeling and simulation,ABMS)方法,在分析其应用任务场景的基础上,通过构造任务场景、桌面模型、仿真验证,深入分析两栖无人作战车系统应具备的功能,并根据分析结果提出所需解决的关键技术。结果表明:该系统对扩展无人系统任务环境、提升自主作战能力有着重要意义。展开更多
文摘During the desing of channel transect,the paper brings forward golden section method,which is 0.618 methods.In order to reduce the calculation volume of the natural depth of water h 0 and bottomˉwidth b which apply trial calculation method and graphic method,and improve the calculate precision,the mathematical model has been built up,the writer combines example to explain the train of thought,the result shows that the calculation precision is high,the correctness is tested and verified by the result which is calculated by hand.It can be referred to the hydroelectric works.
基金This project was supported by the Foundation of MOE of China (No. 00179).
文摘It is well known that the incorrect results will be given using either the electric or magnetic field integral equation to calculate the radar cross section (RCS) of a closed body at the interior resonance. In this paper, an effective iterative technique is used to correct the calculated surface current density from the electric field integral equation. The radar cross section is computed for an infinite conducting circular cylinder at the interior resonance, and the obtained results are in good agreement with the analytical results. The backscattering cross section of an infinite triangular cylinder in the vicinity of a resonant frequency is also calculated. It is shown that the presence method is efficient and accurate.
基金This project was partially supported by the National Natural Science Foundation of China (60371041).
文摘Based on a Pade approximation, a wide-angle parabolic equation method is introduced for computing the multiobject radar cross section （RCS） for the first time. The method is a paraxial version of the scalar wave equation, which solves the field by marching them along the paraxial direction. Numerical results show that a single wide-angle parabofic equation run can compute multi-object RCS efficiently for angles up to 45 ° . The method provides anew and efficient numerical method for computation electromagnetics.
文摘针对未来战争对无人系统的需求不断增加,提出一种适用于狭小空间和复杂环境的新型无人系统——两栖无人作战车系统,同时具备地面行驶、墙面爬行、空中飞行和协同作战能力。采用基于Agent的建模与仿真(agent-based modeling and simulation,ABMS)方法,在分析其应用任务场景的基础上,通过构造任务场景、桌面模型、仿真验证,深入分析两栖无人作战车系统应具备的功能,并根据分析结果提出所需解决的关键技术。结果表明:该系统对扩展无人系统任务环境、提升自主作战能力有着重要意义。
