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数据初始互联的自适应有限记忆法 被引量:3
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作者 何佳洲 彭思鹏 敬忠良 《光电工程》 CAS CSCD 北大核心 2010年第9期1-7,共7页
本文针对高杂波密集环境下边跟边扫雷达实时警戒系统中的数据初始互联问题,提出了一种新的自适应有限记忆法。该方法利用雷达的检测概率和接收机的虚警率,结合所记忆的有限个周期的点迹数估计出可能起始航迹的数目;然后,通过自适应地调... 本文针对高杂波密集环境下边跟边扫雷达实时警戒系统中的数据初始互联问题,提出了一种新的自适应有限记忆法。该方法利用雷达的检测概率和接收机的虚警率,结合所记忆的有限个周期的点迹数估计出可能起始航迹的数目;然后,通过自适应地调整互联相关域的大小及正规化残差平方和阀值,保留可能性较大的量测序列,抑制假航迹。算法分析和仿真结果表明,将雷达的动态检测信息和有限周期的量测相结合,能较好地解决实时系统中的数据初始互联问题。 展开更多
关键词 初始互联 有限记忆法 边跟边扫雷达
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多目标处理的自适应有限记忆法
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作者 何佳洲 《舰船科学技术》 1993年第5期55-58,63,共5页
自适应有限记忆法,充分利用其记忆的有限个周期的点迹信息,对起始航迹数进行估计。然后通过自适应地调整建航的残差等级门限来解决目标的航迹起始问题。航迹的后续跟踪采用了分类相关的算法。计算机仿真证明,本文提出的方法能较好地解... 自适应有限记忆法,充分利用其记忆的有限个周期的点迹信息,对起始航迹数进行估计。然后通过自适应地调整建航的残差等级门限来解决目标的航迹起始问题。航迹的后续跟踪采用了分类相关的算法。计算机仿真证明,本文提出的方法能较好地解决复杂背景下的航迹处理问题。 展开更多
关键词 航迹处理 自适应 有限记忆法
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分数阶 PIλDμ控制器设计及应用实验
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作者 姜萍 王丽颖 +1 位作者 马霄 孙凌燕 《实验技术与管理》 CAS 北大核心 2015年第8期87-90,共4页
按照有限记忆数字实现法,利用RSLogix5000中结构化文本语言,设计了以CompactLogix控制器为核心的分数阶PIλDμ双容水箱液位控制实验平台,并完成了分数阶PIλDμ控制器在罗克韦尔PLC平台上的控制实验,解决了分数阶PIλDμ控制器的工程... 按照有限记忆数字实现法,利用RSLogix5000中结构化文本语言,设计了以CompactLogix控制器为核心的分数阶PIλDμ双容水箱液位控制实验平台,并完成了分数阶PIλDμ控制器在罗克韦尔PLC平台上的控制实验,解决了分数阶PIλDμ控制器的工程实现问题。结果表明,分数阶PIλDμ控制器在惯性比较大的系统中具有很好的控制特性,结构化文本编程的方法符合IEC 61134国际标准,方便可行,适用性强,可以推广到实际生产过程中,具有一定的工程应用价值。 展开更多
关键词 分数阶PIλDμ控制器 有限记忆法 结构化文本 RSLogix 5000
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Finite element simulation of ball spinning of NiTi shape memory alloy tube based on variable temperature field 被引量:2
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作者 江树勇 张艳秋 +2 位作者 赵亚楠 唐明 李春峰 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第3期781-787,共7页
As a new attempt,ball spinning was used to manufacture the nickel-titanium shape memory alloy(NiTi SMA) tube at elevated temperature.The NiTi bar with a nominal composition of Ni50.9Ti49.1(mole fraction,%) was sol... As a new attempt,ball spinning was used to manufacture the nickel-titanium shape memory alloy(NiTi SMA) tube at elevated temperature.The NiTi bar with a nominal composition of Ni50.9Ti49.1(mole fraction,%) was solution treated and was used as the original tube blank for ball spinning.Based on the variable temperature field and the constitutive equation,rigid-viscoplastic finite element method(FEM) was applied in order to simulate the ball spinning of NiTi SMA tube.The temperature field,the stress field,the strain field and the load prediction were obtained by means of FEM.FEM results reveal that there is a temperature increase of about 160 ℃ in the principal deformation zone of the spun part.It can be found from the stress fields and the strain fields that the outer wall of NiTi SMA tube is easier to meet the plastic yield criterion than the inner wall,and the plastic deformation zone is caused to be in a three-dimensional compressive stress state.The radial strain and the tangential strain are characterized by the compressive strain,while the axial strain belongs to the tensile strain.The variation of spinning loads with the progression of the ball is of great importance in predicting the stable flow of the spun part. 展开更多
关键词 NiTi alloy NiTi tube shape memory alloy finite element method ball spinning
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Prediction of grain scale plasticity of NiTi shape memory alloy based on crystal plasticity finite element method 被引量:5
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作者 Li HU Shu-yong JIANG +1 位作者 Lai-xin SHI Yan-qiu ZHANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第4期775-784,共10页
Grain scale plasticity of NiTi shape memory alloy(SMA)during uniaxial compression deformation at 400℃was investigated through two-dimensional crystal plasticity finite element simulation and corresponding analysis ba... Grain scale plasticity of NiTi shape memory alloy(SMA)during uniaxial compression deformation at 400℃was investigated through two-dimensional crystal plasticity finite element simulation and corresponding analysis based on the obtained orientation data.Stress and strain distributions of the deformed NiTi SMA samples confirm that there exhibits a heterogeneous plastic deformation at grain scale.Statistically stored dislocation(SSD)density and geometrically necessary dislocation(GND)density were further used in order to illuminate the microstructure evolution during uniaxial compression.SSD is responsible for sustaining plastic deformation and it increases along with the increase of plastic strain.GND plays an important role in accommodating compatible deformation between individual grains and thus it is correlated with the misorientation between neighboring grains,namely,a high GND density corresponds to large misorientation between grains and a low GND density corresponds to small misorientation between grains. 展开更多
关键词 grain scale plasticity NiTi shape memory alloy crystal plasticity finite element method plastic deformation microstructure evolution
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