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Passive target tracking using marginalized particle filter

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Journal of Systems Engineering and Electronics 2007年第3期18卷 503-508页

作者： Zhan Ronghui wang ling wan Jianwei Sun Zhongkang School of Electronic Science and Engineering National Univ. of Defense Technology Changsha 410073 P. R. China

A marginalized particle filtering （MPF） approach is proposed for target tracking under the background of passive measurement. Essentially, the MPF is a combination of particle filtering technique and Kalman filter. By making full use of marginalization, the distributions of the tractable linear part of the total state variables are updated analytically using Kalman filter, and only the lower-dimensional nonlinear state variable needs to be dealt with using particle filter. Simulation studies are performed on an illustrative example, and the results show that the MPF method leads to a significant reduction of the tracking errors when compared with the direct particle implementation. Real data test results also validate the effectiveness of the presented method.

关键词： nonlinear filtering passive target tracking particle filter marginalized particle filter state estimation.

Slope stability analysis of Southern slope of Chengmenshan copper mine,China

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International Journal of Mining Science and Technology 2015年第2期25卷 171-175页

作者： Mohammed Mnzool wan ling Wei Zuo'an State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing University College of Resource and Environmental Science Chongqing University College of Aerospace Engineering Chongqing University

The engineering geology and hydrogeology in the southern slope of Chengmenshan copper mine are very complicated,because there is a soft-weak layer between two kinds of *** investigations demonstrate that some instability problems might occur in the *** this research,the southern slope,which is divided into six sections(I-0,I-1,I-2,II-0,II-1 and II-2),is selected for slope stability analysis using limit equilibrium and numerical *** results show that the values of factor of safety(FOS) of sections I-0,I-1 and I-2 are very low and slope failure is likely to *** reinforcement subjected to seismic,water and weak layer according to sections were carried out to increase the factor of safety of the three sections,two methods were used;grouting with hydration of cement and water to increase the cohesion(c) and pre-stressed *** of reinforcement showed that factor of safety increased more than 1.15.

关键词： Slope stability Limit equilibrium method Numerical method Slope reinforcement

Two-sample Testing for Mean Functions with Incompletely Observed Functional Data

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Acta Mathematicae Applicatae Sinica 2020年第2期36卷 374-389页

作者： Yan-qiu ZHOU Yan-ling wan Tao ZHANG School of Science Guangxi University of Science and TechnologyLiuzhou 545006China School of Social Science Guangxi University of Science and TechnologyLiuzhou 545006China

In functional data analysis,the collected data are often assumed to be fully observed on the ***,in dealing with real data(for example,environmental pollution data),we are often faced with the scenario that some functional data are fully observed on dense lattice while others are incompletely *** this paper,we propose a method for testing equivalence of mean functions of two samples under this *** asymptotic results of the proposed methods are *** proposed test is employed to analyze an environmental pollution study in Liuzhou City of *** show that the proposed test has a good control of the type-I error,and is more powerful than the complete case test in most cases.

关键词： functional data analysis significance test incompletely observed functional data mean function

On the grouping effect of the l_(1-2)models

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Applied Mathematics(A Journal of Chinese Universities) 2022年第3期37卷 422-434页

作者： SHEN Yi GUO wan-ling HU Rui-fang The Department of Mathematics Zhejiang Sci-Tech UniversityHangzhou 310018China School of Information Engineering Jiaxing Nanhu UniversityJiaxing 314001China

This paper aims to study the mathematical properties of the l vmodels that employ measurement matrices with correlated *** first show that the l_(1-2)model satisfies the grouping effect which ensures that coefficients corresponding to highly correlated columns in a measurement matrix have small *** we provide the stability analysis based on the sparse approximation *** the entries of the vectors have different signs,we show that the grouping effect also holds for the constraint l_(1-2)minimization model which is implicated by the linearized Bregman iteration.

关键词： grouping effect sparsity linearized Bregman non-convex compressed sensing

Frost deformation and microstructure evolution of porous rock under uniform and unidirectional freeze-thaw conditions

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Journal of Mountain Science 2024年第8期21卷 2855-2869页

作者： LV Zhitao LIU Jintao wan ling LIU Weiping School of Infrastructure Engineering Nanchang UniversityNanchang 330031China College of Civil Engineering and Architecture Nanchang Hangkong UniversityNanchang 330063China

The frost deterioration and deformation of porous rock are commonly investigated under uniform freeze-thaw(FT)***,the unidirectional FT condition,which is also prevalent in engineering practice,has received limited ***,a comparative study on frost deformation and microstructure evolution of porous rock under both uniform and unidirectional FT conditions was ***,frost deformation experiments of rock were conducted under cyclic uniform and unidirectional FT action,*** illustrate that frost deformation of saturated rock exhibits isotropic characteristics under uniform FT cycles,while it shows anisotropic characteristics under unidirectional FT condition with both the frost heaving strain and residual strain along FT direction much higher than those perpendicular to FT ***,the peak value and residual value of cumulative frost strain vary as logarithmic functions with cycle number under both uniform and unidirectional FT ***,the microstructure evolution of rock suffered cyclic uniform and unidirectional FT action were *** uniform FT cycles,newly generated pores uniformly distribute in rock and pore structure of rock remains isotropic in micro scale,and thus the frost deformation shows isotropic characteristics in macro *** unidirectional FT cycles,micro-cracks or pore belts generate with their orientation nearly perpendicular to the FT direction,and rock structure gradually becomes anisotropic in micro scale,resulting in the anisotropic characteristics of frost deformation in macro scale.

关键词： Frost deformation Microstructure evolution Porous rock Unidirectional freeze-thaw cycles Uniform freeze-thaw cycles

Modal analysis of subway tunnel in soft soil during operation

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Underground Space 2023年第1期8卷 181-195页

作者： ling wan Xiongyao Xie Lujun wang Pan Li Qiang Huang College of Civil Engineering and Architecture Nanchang Hangkong UniversityNanchang 330063China Jiangxi Transportation Institute Co LtdNanchang 330200China Key Laboratory of Geotechnical and Underground Engineering Ministry of EducationTongji UniversityShanghai 20092China Center for Hypergravity Experimental and Interdisciplinary Research MOE Key Laboratory of Soft Soils and Geoenvironmental EngineeringCollege of Civil Engineering and ArchitectureZhejiang UniversityHangzhou 310058China Institute of Geotechnical Engineering Ningbo UniversityNingbo 315211China

Modal parameters are of great significance in civil engineering because they can characterize the properties of structures and be used for vibration control and structural health *** tunnels are long linear truss structures combined with the mutual cou-pling of the surrounding ***,the operational modal analysis of a mutual coupling tunnel is complicate,as is the modal iden-tification of shield tunnels in a time–frequency domain,and these are hot civil engineering *** the shield tunnel of Shanghai metro line No.12 project as a case study,we carried out the vibration response monitoring of a subway tunnel during operation and presented methods to identify structural modal *** modal parameters of lower vibration modes were estimated using response *** frequencies and shapes were identified with high precision and accuracy using the orthogonal polynomial clustering algorithm under hammer excitation conditions and the autoregressive-moving-average model under ambient excitation *** dynamic behavior of a mutual coupling tunnel presented obvious low frequency characteristics,and the first 9th order mode frequencies were less than 100 *** diagonal values of the modal assurance criteria were all greater than *** modal parameters can be used for the health monitoring of operational subway tunnels.

关键词： Monitoring method Modal identification Vibration response Operational subway tunnel

Geometrical shape of in-plane inclusion characterized by polynomial internal stress field under uniform eigenstrains

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Applied Mathematics and Mechanics(English Edition) 2016年第9期37卷 1113-1130页

作者： Jian WU C.Q.RU Liang ZHANG ling wan College of Aerospace Engineering Chongqing University Department of Mechanical Engineering University of Alberta State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology

The internal stress field of an inhomogeneous or homogeneous inclusion in an infinite elastic plane under uniform stress-free eigenstrains is studied. The study is restricted to the inclusion shapes defined by the polynomial mapping functions mapping the exterior of the inclusion onto the exterior of a unit circle. The inclusion shapes, giving a polynomial internal stress field, are determined for three types of inclusions, i.e., an inhomogeneous inclusion with an elastic modulus different from the surrounding matrix, an inhomogeneous inclusion with the same shear modulus but a different Poisson＇s ratio from the surrounding matrix, and a homogeneous inclusion with the same elastic modulus as the surrounding matrix. Examples are presented, and several specific conclusions are achieved for the relation between the degree of the polynomial internal stress field and the degree of the mapping function defining the inclusion shape.

关键词： inclusion shape internal stress field eigenstrain polynomial

Comparative numerical and experimental study of two combined wind and wave energy concepts

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Journal of Ocean Engineering and Science 2016年第1期1卷 36-51页

作者： Zhen Gao Torgeir Moan ling wan Constantine Michailides Centre for Ships and Ocean Structures Norwegian University of Science and TechnologyTrondheimNorway Centre for Autonomous Marine Operations and Systems Norwegian University of Science and TechnologyTrondheimNorway Department of Marine Technology Norwegian University of Science and TechnologyTrondheimNorway

With a successful and rapid development of offshore wind industry and increased research activities on wave energy conversion in recent years,there is an interest in investigating the technological and economic feasibility of combining offshore wind turbines(WTs)with wave energy converters(WECs).In the EU FP7 MARINA Platform project,three floating combined concepts,namely the spar torus combination(STC),the semi-submersible flap combination(SFC)and the oscillating water column(OWC)array with a wind turbine,were selected and studied in detail by numerical and experimental *** paper summarizes the numerical modeling and analysis of the two concepts:STC and SFC,the model tests at a 1:50 scale under simultaneous wave and wind excitation,as well as the comparison between the numerical and experimental *** operational and survival wind and wave conditions were *** numerical analysis was based on a time-domain global model using potential flow theory for hydrodynamics and blade element momentum theory(for SFC)or simplified thrust force model(for STC)for *** techniques for model testing of combined wind and wave concepts were discussed with focus on modeling of wind turbines by disk or redesigned small-scale rotor and modeling of power take-off(PTO)system for wave energy conversion by pneumatic damper or hydraulic rotary *** order to reduce the uncertainty due to scaling,the numerical analysis was performed at model scale and both the numerical and experimental results were then up-scaled to full scale for *** comparison shows that the current numerical model can well predict the responses(motions,PTO forces,power production)of the combined concepts for most of the ***,the linear hydrodynamic model is not adequate for the STC concept in extreme wave conditions with the torus fixed to the spar at the mean water level for which the wave slamming on the torus occurs and this requires further investigati

关键词： Combined wind and wave energy concept Floating wind turbine Wave energy converter Numerical analysis Model test.

Cooperative localization method for multi-robot based on PF-EKF

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Science in China(Series F) 2008年第8期51卷 1125-1137页

作者： wanG ling wan JianWei LIU YunHui SHAO JinXin School of Electronic Science and Engineering National University of Defense Technology Changsha410073 China

A method of cooperative localization for multi-robot in an unknown environment is described. They share information and perform localization by using relative observations and necessary communication. At initial time, robots do not know their positions. Once the robot that can obtain the absolute position information has its position, other robots use particle filter to fuse relative observations and maintain a set of samples respectively representing their positions. When the particles are close to s Gsussian distribution after a number of steps, we switch to an EKF to track the pose of the robots. Simulation results and real experiment show that PF-EKF method combines the robustness of PF and the efficiency of EKF. Robots can share the absolute position information and effectively localize themselves in an unknown environment.

关键词： cooperative localization relative observation particle filter EKF