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Improved Kalman filter method considering multiple factors and its application in landslide prediction

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Frontiers of Earth Science 2020年第3期14卷 625-636页

作者： Qing Ling wei Qu Qin Zhang Lingjie Kong jing Zhang Li zhu College of Geology Engineering and Geomatics Chang’an UniversityXi’an710064China School of Civil Engineering Lanzhou University of TechnologyLanzhou730050China Information Engineering University Zhengzhou450002China

Landslides,seriously threatening human lives and environmental safety,have become some of the most catastrophic natural disasters in hilly and mountainous areas ***,it is necessary to forecast landslide deformation for landslide risk *** paper presents a method of predicting landslide displacement,i.e.,the improved multi-factor Kalman filter(KF)*** developed model has two advantages over the traditional KF ***,it considers multiple external environmental factors(e.g.,rainfall),which are the main triggering factors that may induce slope ***,the model includes random disturbances of *** proposed model was constructed using a time series which consists of over 16-month of data on landslide movement and precipitation collected from the Miaodian loess landslide monitoring system and nearby meteorological stations in Shaanxi province,*** validation was performed by predicting movements for periods of up to 7 months in the *** performance of the developed model was compared with that of the improved single-factor KF,multi-factor KF,multi-factor radial basis function,and multi-factor support vector regression *** results show that the improved multi-factor KF method outperforms the other models and that the predictive capability can be improved by considering random disturbances of triggers.

关键词： landslide improved Kalman filter triggering factors displacement prediction

基于时频特征融合和关系网络的少样本轴承故障诊断方法研究

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软件工程 2025年第1期28卷 69-72页

作者：黄静高伟浙江理工大学信息学院浙江杭州310018

针对滚动轴承故障样本不足和特征信息获取不全面导致故障诊断准确率低的问题,提出了一种基于时频特征融合和关系网络的少样本故障诊断方法。该方法结合元学习的训练策略,首先设计了一个特征提取模块,用于获取滚动轴承振动信号的时频域... 详细信息

针对滚动轴承故障样本不足和特征信息获取不全面导致故障诊断准确率低的问题,提出了一种基于时频特征融合和关系网络的少样本故障诊断方法。该方法结合元学习的训练策略,首先设计了一个特征提取模块,用于获取滚动轴承振动信号的时频域信息并进行融合,以此加强获取特征的全面性;其次使用关系网络的度量模块计算支持样本和查询样本的相似得分,最终实现故障诊断。实验结果表明,在CWRU数据集的跨工况场景下,本方法展现出了优异的性能,故障诊断准确率最高可达99.82%,并有效验证了特征提取模块的有效性,显著提升了滚动轴承故障诊断的准确性和可靠性。

关键词：少样本学习故障诊断关系网络特征融合滚动轴承

综合医院精神卫生实践方法之UPSCALE查房模型

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医学与哲学（B） 2016年第10期37卷 70-72,84页

作者：曹锦亚魏镜朱丽明曾学军李宏军高山赵维刚田国庆蒋静 Kurt Fritzsche 中国医学科学院北京协和医学院北京协和医院北京100730 德国弗莱堡大学心身医学和心理治疗科德国弗莱堡d79104

综合医院精神卫生服务需求非常之高,门诊常见有躯体疾病合并精神心理问题或以躯体症状就诊的心理生理障碍患者。医学分科导致的医学学科割裂正使得各学科在独立处理这些患者时都面临困难。北京协和医院心理医学科魏镜医生探索建立的多... 详细信息

综合医院精神卫生服务需求非常之高,门诊常见有躯体疾病合并精神心理问题或以躯体症状就诊的心理生理障碍患者。医学分科导致的医学学科割裂正使得各学科在独立处理这些患者时都面临困难。北京协和医院心理医学科魏镜医生探索建立的多学科的、生物心理社会医学模式为理念的、基于以患者为中心的医患关系和访谈模式的UPSCALE查房模型设计用于从形式到内容上都整合地去面对患者这个人和患者的症状,以有效地建立医患关系、实现对患者的有效治疗。其已在临床上显示有效性和可操作性。

关键词：综合医院精神卫生服务联络会诊生物心理社会医学模式以患者为中心多学科

Output Tracking for One-Dimensional Wave Equation with Non-Collocated Control and Output Configuration

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Journal of Systems Science & Complexity 2020年第5期33卷 1469-1484页

作者： wei jing FENG Hongyinping School of Mathematical Sciences Shanxi UniversityTaiyuan 030006China

This paper considers output tracking for a one-dimensional wave equation with general disturbance which includes both internal nonlinear uncertainty and external *** performance output is non-collocated to the *** disturbance is estimated by an essentially extended state observer from active disturbance rejection control and the difficulty caused by the non-collocated configuration of control and output is overcome by a proper trajectory *** output feedback law is proposed to make the tracking error be convergent to zero exponentially as time goes to *** the same time,all states of the closed-loop system are shown to be uniformly *** simulation is also presented to validate the theoretical results.

关键词： Disturbance estimation output feedback output tracking wave equation

Robust adaptive radar beamforming based on iterative training sample selection using kurtosis of generalized inner product statistics

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Journal of Systems Engineering and Electronics 2024年第1期35卷 24-30页

作者： TIAN jing ZHANG wei School of Information and Electronics Beijing Institute of TechnologyBeijing 100081China National Key Laboratory of Electromagnetic Space Security Chengdu 610036China

In engineering application,there is only one adaptive weights estimated by most of traditional early warning radars for adaptive interference suppression in a pulse reputation interval(PRI).Therefore,if the training samples used to calculate the weight vector does not contain the jamming,then the jamming cannot be removed by adaptive spatial *** the weight vector is constantly updated in the range dimension,the training data may contain target echo signals,resulting in signal cancellation *** cope with the situation that the training samples are contaminated by target signal,an iterative training sample selection method based on non-homogeneous detector(NHD)is proposed in this paper for updating the weight vector in entire range *** principle is presented,and the validity is proven by simulation results.

关键词： adaptive radar beamforming training sample selection non-homogeneous detector electronic jamming jamming suppression

Ferroelectric domains and phase transition of sol-gel processed epitaxial Sm-doped BiFeO_(3)(001)thin films

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Journal of Materiomics 2018年第1期4卷 27-34页

作者： Zhen Zhou wei Sun Zhenyu Liao Shuai Ning jing zhu jing-Feng Li State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing100084China National Center for Electron Microscopy in Beijing State Key Laboratory of New Ceramics and Fine ProcessingKey Laboratory of Advanced Materials(MOE)School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

BiFeO_(3),a room-temperature multiferroic material,has recently been increasingly applied as a potential lead-free piezoelectric material due to its large piezoelectricity achieved by *** this work,12%Smdoped BiFeO_(3)epitaxial thin films were fabricated on Nb-doped SrTiO_(3)(001)single crystal substrates via sol-gel *** epitaxy was verified by reciprocal space mapping(RSM)and transmission electron microscope(TEM).The TEM results indicated the coexistence of R3c and Pbam phases in the *** domains and piezoelectric properties from room temperature to 200℃were characterized by piezoresponse force microscopy(PFM).Domains became active from 110℃to 170℃,and domain configurations changed obviously.A partially fading piezoresponse indicated the emergence of antiferroelectric *** in-situ domain analysis suggested that the phase transition was accompanied by domain wall *** spectroscopy PFM(SS-PFM)was further conducted to investigate the piezoresponse during the phase *** responses were found in both ON and OFF states at 170℃,and the film exhibits typical antiferroelectric behavior at 200℃,implying that the completion of phase transition and structure turned to the Pbam *** work revealed the origin of the high piezoresponse of Sm-doped BiFeO_(3)thin films at the morphotropic phase boundary(MPB).

关键词： BiFeO_(3) Piezoresponse force microscopy Morphotropic phase boundary Phase transition Antiferroelectric

Numerical study of creep effect on purging plug performance under cyclic service

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Journal of Iron and Steel Research International 2022年第7期29卷 1119-1128页

作者： Fang-guan Tan Sheng-li Jin zhu He Xiong Liang Ya-wei Li jing Li The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina National-Provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology Wuhan University of Science and TechnologyWuhan 430081HubeiChina Chair of Ceramics Montanuniversitaet Leoben8700 LeobenAustria The Key Laboratory of Chemical Metallurgy Engineering of Liaoning Province and School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051LiaoningChina

The service life of the purging plug is one of the fundamental factors that determine the downtime and usage efficiency of the whole *** creep behaviour of the purging plug was thus investigated to identify the possible failure *** first,the creep parameters of the Norton–Bailey strain hardening rule were inversely identified via the results of the creep ***,the thermal-solid coupling model approach was employed to predict the creep behaviour of the purging plug,in which the Norton–Bailey strain hardening rule was *** numerical results show that the temperature of the purging plug presents a cyclic trend after the first service period since the preheating temperature is lower than the temperature of molten ***,the distribution of the creep strain intensity in a layered form could also contribute to a gradual spalling of the purging plug end in ***,the creep strain concentration around the slit can be responsible for the clogging of the purging plug.

关键词： Strain hardening Creep test Creep deformation Purging plug Castable corundum

Separation and enrichment mechanism of C54–TiSi_(2) from hypoeutectic Ti–65 wt.%Si alloy during directional solidification via alternating electromagnetic fields

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Journal of Iron and Steel Research International 2021年第1期28卷 29-37页

作者： Kui‑song zhu jing‑fei Hu Wen‑hui Ma Kui‑xian wei Yong‑nian Dai The National Engineering Laboratory for Vacuum Metallurgy State Key Laboratory of Complex Nonferrous Metal Resources Clean UtilizationKunming University of Science and TechnologyKunming 650093YunnanChina College of Vanadium and Titanium Panzhihua UniversityPanzhihua 617000SichuanChina Key Laboratory for Nonferrous Vacuum Metallurgy of Yunnan Province Engineering Research Center for Silicon Metallurgy and Silicon Materials of Yunnan Provincial UniversitiesKunming University of Science and TechnologyKunming 650093YunnanChina

The effects of directional solidification parameters and the coupling of directional solidification parameters and alternating electromagnetic fields on separation and enrichment of the C54–TiSi2 phase were investigated in a directionally solidified hypoeutectic Ti–65 wt.%Si *** results indicated that by increasing the pull-down velocity at a given position within the ingot,the cooling rate,growth rate,and temperature gradient of ingot could be *** a pull-down velocity near 5μm/s,the temperature gradient,cooling rate,and growth rate decreased with increasing the thickness of the C54–TiSi2-rich *** fields enhanced mass transfer at pull-down velocities of 5,10,15,and 20μm/s,with resulting enriched layer thicknesses of 15,10,10,and 5 mm,*** increasing the percentage of Ti in the Ti–Si alloy from 25 to 35 wt.%,the thickness of the C54–TiSi2-rich layer was increased from 2.5 to 3.3 ***,the maximum C54–TiSi2 content obtained experimentally in this layer decreased from 92.06 to 79.49 mass%.

关键词： Ti–Si alloy Directional solidification Electromagnetic field Separation C54–TiSi2

Mechanical behavior of Ti-6Al-4V lattice-walled tubes under uniaxial compression

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Defence Technology（防务技术） 2022年第7期18卷 1124-1138页

作者： Gen-zhu Feng jing Wang Xin-yuan Li Li-jun Xiao wei-dong Song State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China Earthquake Engineering Research Center China Institute of Water Resources and Hydropower ResearchBeijing100048PR China Beijing Research Institute of Automation for Machinery Industry Co. LtdBeijing100120China

The compression behavior of the lattice-walled tubes under variable strain rates are investigated by numerical simulation,and the stress-strain relationship of the structure under quasi-static loading is theoretically *** finite element software LS-DYNA is used to simulate the structure established by the beam element,and the critical impact velocity is obtained when the structure collapses layer by *** to the plastic hinge theory and considering the combined action of the beam's bending moment and axial force in the structure,the stress-strain relationship of the structure under quasi-static loading is derived and compared with the experimental *** numerical simulation results reveal that the structure of the single-layer gradient tube(SGC)does not undergo shear deformation under quasi-static and low-speed *** critical speed of the gradient square tube(GS)is higher than that of a cylindrical *** theoretical model can correctly reflect the mechanical response of the structure under uniaxial compression.

关键词： Lattice-walled tubes Plastic hinge theory Numerical simulation Critical velocity